Ch 13: Inventory Valuation

Inventory valuation is the process of determining the worth of a company's stock of goods or materials available for sale or used in production. The value of inventory should be calculated using the lower of cost and net realizable value, where the cost is compared to the expected selling price. Choosing an appropriate inventory valuation method such as FIFO, LIFO, weighted average, or specific identification can greatly affect a company's financial statements, particularly profitability and net assets. Therefore, it is crucial for companies to carefully evaluate the nature of their inventory items and the impact of each method before deciding on the one that best suits their business requirements.

Inventory Valuation

Inventory valuation is a critical aspect of financial accounting. It involves the determination of the worth of a company's stock of goods available for sale or use in production. Accurate inventory valuation directly impacts a company’s financial position, performance, and compliance with accounting standards such as IAS 2 (Inventory Valuation Standard) or GAAP (Generally Accepted Accounting Principles).

In this article, we will explore key concepts related to inventory valuation, practical examples, and advanced considerations for ensuring financial accuracy.

Understanding Inventory Valuation

Inventory refers to a collection of items that a company owns, including:

• Goods bought for resale.
• Raw materials and components.
• Partially finished goods and fully finished products.

These items represent current assets on a company’s balance sheet and play a pivotal role in the calculation of cost of goods sold (COGS), profit margins, and overall financial health.

The Importance of Inventory Valuation

Inventory valuation involves determining the value of inventory to report it on the company’s balance sheet accurately. It is crucial because:

1. Financial Reporting: Inventory is a key component of current assets and impacts the accuracy of financial statements.
2. Profit Measurement: Valuation affects the cost of goods sold and ultimately the net income of a business.
3. Compliance: Following established valuation rules ensures compliance with accounting standards like IFRS and GAAP.
4. Decision-Making: Accurate valuation informs pricing, production planning, and inventory management decisions.

Valuation Principles: Lower of Cost and Net Realizable Value

The lower of cost and net realizable value (NRV) principle ensures that inventory is reported conservatively to avoid overstating assets.

Cost of Inventory

The cost of inventory includes:

1. Cost of Purchase:
2. Cost of Conversion:
3. Excluded Costs:

Net Realizable Value (NRV)

NRV is the estimated selling price less any costs required to complete and sell the inventory.

• Example: A company anticipates selling a batch of items for $1,000 but expects $200 in selling expenses. NRV = $1,000 - $200 = $800.

Example: Valuing Inventory

Let’s look at a bicycle manufacturer as an example:

• Cost Calculation: Producing one bicycle costs $200, and the company has 100 bicycles in inventory, valued at $20,000 ($200 x 100).
• Market Changes: Due to declining demand, the expected selling price drops to $180 per bicycle. Selling costs are $10 per bicycle.
• NRV: Selling price ($180) - Selling costs ($10) = $170 per bicycle. For 100 bicycles, NRV = $170 x 100 = $17,000.
• Valuation: As per the lower of cost ($20,000) and NRV ($17,000), the inventory must be valued at $17,000.

If the inventory were valued at the original $20,000, the company would overstate its assets, distorting its financial statements and violating the principle of prudence.

Inventory valuation methods

Inventory valuation methods refer to the different approaches used to determine the monetary value of the goods held in stock by a business. There are several inventory valuation methods, including First-In-First-Out (FIFO), Last-In-First-Out (LIFO), Weighted Average Cost (WAC), and Specific Identification.

First-In-First-Out (FIFO)

The FIFO method assumes that the first items purchased are the first items sold. Therefore, the cost of the oldest inventory is assigned to the cost of goods sold (COGS), and the cost of the most recent inventory is assigned to ending inventory. This method is best suited for businesses that sell perishable goods that have a limited shelf life.

For example, let's say a bakery purchases 100 bags of flour at $10 each in January and another 100 bags at $12 each in February. In March, the bakery sells 120 bags of flour. According to the FIFO method, the cost of the first 100 bags sold would be $10 each, and the cost of the remaining 20 bags sold would be $12 each. The value of the ending inventory would be 80 bags at $12 each.

Last-In-First-Out (LIFO)

The LIFO method assumes that the most recent items purchased are the first items sold. Therefore, the cost of the most recent inventory is assigned to the cost of goods sold, and the cost of the oldest inventory is assigned to ending inventory. This method is best suited for businesses that sell non-perishable goods, as the older inventory is less likely to spoil.

For example, let's say a hardware store purchases 100 hammers at $5 each in January and another 100 at $6 each in February. In March, the hardware store sells 120 hammers. According to the LIFO method, the cost of the first 100 hammers sold would be $6 each, and the cost of the remaining 20 hammers sold would be $5 each. The value of the ending inventory would be 80 hammers at $5 each.

Weighted Average Cost (WAC)

The WAC method calculates the average cost of all inventory items, regardless of when they were purchased. The average cost is then assigned to the cost of goods sold and ending inventory. There are two methos of weighted average Periodic Weighted Average and Continuous Weighted Average:

Periodic Weighted Average:

Under the periodic weighted average method, the average cost of inventory is calculated at the end of a specific period, such as a month or a year. The cost of goods sold is calculated using the weighted average cost of inventory over the entire period. This method is more suitable for businesses with a low volume of inventory transactions or those that rely on manual record-keeping systems.

For example, if a business starts a month with 50 units of inventory costing $10 each and purchases 100 units of inventory costing $12 each during the month. The ending inventory is 75 units, and the weighted average cost of inventory for the month would be ($50 x $10) + ($100 x $12) / (50 + 100) = $11.33. The cost of goods sold would be calculated using the weighted average cost of inventory.

Continuous Weighted Average:

Under the continuous weighted average method, the average cost of inventory is calculated and updated after every purchase or sale of inventory. The weighted average cost is calculated by dividing the total cost of all units of inventory by the total number of units in stock. This method is more suitable for businesses with high volume of inventory transactions or those that use computerized inventory management systems.

Example:

The following is list of inventory activity for the business, now lets see how Continuous Weighted Average method works in action:

• Dec 1 - Purchase 50 units for unit cost price of $10, total cost ($500)
• Dec 12 - Sales 12 Units for unit cost price of $10 ($500/50 units) - at this point cost of goods sold is $120 (12*$10) and the value of inventory left will be - $380 (38*$10)
• Dec 17 - Purchase 150 units for unit cost price of $12, total cost ($1,800) At this point, since the company is using continuous weighted average costing technique, the unit costs will be calculated as follows:
• Dec 22 - Sales 100 Units for unit - at this point cost of goods sold is $1,160 (100*$11.60) and the value of inventory left will be - $1,020.80 (88*$11.60)

The periodic weighted average method is suitable for businesses with low inventory transactions or manual inventory management systems. On the other hand, the continuous weighted average method is suitable for businesses with high inventory transactions or computerized inventory management systems. The choice of method depends on the business's needs, the complexity of the inventory system, and the accuracy of record-keeping.

Specific Identification

The specific identification method assigns the actual cost of each item to the cost of goods sold and ending inventory. This method is best suited for businesses that sell high-value, unique items with identifiable serial numbers, such as cars or jewelry.

For example, let's say a car dealership purchases three cars, a red one for $20,000, a blue one for $22,000, and a green one for $25,000. The dealership sells the red car for $25,000, the blue car for $24,000, and the green car for $28,000. According to the specific identification method, the cost of goods sold would be $20,000 for the red car, $22,000 for the blue car, and $25,000 for the green car. The value of the ending inventory would be $0 as all cars were sold.

All in all, choosing the appropriate inventory valuation method is critical for businesses to accurately reflect their financial situation. Each method has its advantages and disadvantages, and the selection of the method depends on the nature of the business, the type of inventory, and accounting policies. The choice of inventory valuation method can have a significant impact on a business's financial statements, particularly on its profitability and taxes. Therefore, it is essential to choose the appropriate method that aligns with the nature of the business and accurately reflects its financial situation.

Impact of inventory valuation methods

The inventory valuation method used by a company can have a significant impact on its reported profit and net assets. This is because the cost of goods sold and the value of ending inventory, which are used in the calculation of profit and net assets, depend on the method used to value inventory.

Let's consider a company that sells widgets and has the following inventory transactions for the month of January:

• January 1 - Beginning inventory: 100 units at a cost of $5 each
• January 12 - Purchased 200 units at a cost of $6 each
• January 12 - Sold 250 units

To demonstrate the impact of different inventory valuation methods, we will use the same inventory transactions but calculate the cost of goods sold and ending inventory value using four different methods: FIFO, LIFO, weighted average, and specific identification.

FIFO (First-In, First-Out)

Under the FIFO method, the cost of goods sold is calculated based on the assumption that the oldest inventory items are sold first. This means that the cost of the 100 units in beginning inventory is used to calculate the cost of goods sold for the first 100 units sold, and the cost of the 200 units purchased later is used to calculate the cost of goods sold for the remaining 150 units sold. The ending inventory value is based on the cost of the 50 units remaining in stock, which were purchased at the most recent cost.

Using the example above, the cost of goods sold under the FIFO method would be:

• 100 units x $5 = $500 from the beginning inventory
• 150 units x $6 = $900 for the remaining 150 units sold from purchased items
• Total cost of goods sold = $500+ $900 = $1,400

The ending inventory value under the FIFO method would be:

• 50 units x $6 = $300

LIFO (Last-In, First-Out)

Under the LIFO method, the cost of goods sold is calculated based on the assumption that the newest inventory items are sold first. This means that the cost of the 200 units purchased later is used to calculate the cost of goods sold for the first 200 units sold, and the cost of the 100 units in beginning inventory is used to calculate the cost of goods sold for the remaining 50 units sold. The ending inventory value is based on the cost of the 100 units remaining in stock, which were purchased at the lowest cost.

Using the example above, the cost of goods sold under the LIFO method would be:

• 200 units x $6 = $1,200 for the units purchased in January
• 50 units x $5 = $250 for the beginning inventory
• Total cost of goods sold = $1,200 + $250 = $1,450

The ending inventory value under the LIFO method would be:

• 50units x $5 = $250

Weighted Average

Under the weighted average method, the cost of goods sold and the value of ending inventory are calculated based on the weighted average cost per unit of inventory. This method was discussed in detail in the previous section, so we won't repeat the detail here.

Using the example above, the cost of goods sold under the weighted average method would be $1,417.50 = ($5.67 Unit Cost * 250 Unit). Unit cot is calculated as follows ($500+$1,200)/(100+200) = $5.67, and the ending inventory value would be $283.50 (50*$5.67).

Specific Identification

Under the specific identification method, the cost of goods sold and the value of ending inventory are based on the actual cost of each unit sold or remaining in stock. This method is only feasible if each unit of inventory can be identified and tracked separately, such as in a jewelry store or an art gallery where each item is unique and has a different cost.

Using the example above, let's assume that the company is able to identify each unit of inventory separately. The cost of goods sold and ending inventory value would be calculated as follows:

• Sold 100 units from the January 1st beginning inventory at a cost of $5 each, for a cost of goods sold of $500.
• Sold 150 units from the January 12th purchase at a cost of $6 each, for a cost of goods sold of $900.
• The ending inventory would consist of 50 units from the January 12th purchase at a cost of $6 each, for an ending inventory value of $300.

As we can see from the above example, the specific identification method results in a more accurate valuation of cost of goods sold and ending inventory, but it is only feasible for companies with unique and identifiable inventory items.

Advantages and Disadvantages of Inventory Valuation Methods

FIFO (First-In, First-Out)

Advantages:

1. Realistic Cost Matching: It matches revenues with older inventory costs, providing a more accurate representation of profit.
2. Tax Benefits: In a falling price environment, using FIFO can result in lower taxable income and, consequently, lower taxes.

Disadvantages:

1. Distorted Profits:
2. During periods of inflation, FIFO tends to inflate profits as older, lower-cost inventory is matched with current higher selling prices.
3. Complex Tracking:
4. Can be administratively challenging, especially in industries where products are interchangeable.

LIFO (Last-In, First-Out)

Advantages:

1. Tax Advantages: In periods of inflation, LIFO can result in lower taxable income and reduced tax liability.
2. Recent Cost Reflection: Reflects the current market prices of inventory more accurately, especially in inflationary environments.

Disadvantages:

1. Mismatch with Physical Flow:
2. LIFO may not represent the actual flow of goods, as newer inventory is often kept in storage while older inventory is sold.
3. Financial Reporting Challenges:
4. Can make financial statements less comparable across different companies or periods.

Weighted Average Price

Advantages:

1. Simplicity:
2. Easy to calculate and understand, making it a straightforward method for small businesses or those with simple inventory systems.
3. Smoothing Effects:
4. It helps mitigate the impact of rapid price changes on the cost of goods sold and ending inventory by averaging costs over time.

Disadvantages:

1. May Not Reflect Current Market Prices:
2. In times of significant price fluctuations, the weighted average may not accurately capture the current market prices.
3. Impact of Extreme Costs:
4. Significant variations in inventory costs can affect accuracy. The weighted average may not accurately reflect the actual cost of individual units in such cases.

Advanced Considerations

1. Impact of Valuation on Financial Ratios:
2. Global Variations in Standards:
3. Technology and Tools:

Challenges in Inventory Valuation

• Market Fluctuations: Rapid price changes can complicate valuation.
• Obsolescence: Outdated inventory may need significant write-downs.
• Errors in Cost Allocation: Misclassifying indirect costs can lead to inaccurate valuations.

FAQs

1. What happens if inventory is overvalued?
2. Which inventory method is best?
3. How do businesses handle obsolescence?

Key takeaways

• Inventory should be valued at the lower of cost and net realizable value. This involves comparing the acquisition or production cost to the expected selling price.
• Inventory costs include purchase, conversion, handling, and transportation costs. Selling, storage, and administrative expenses should not be included in inventory valuation.
• Different inventory valuation methods include FIFO, LIFO, weighted average, and specific identification, each with its own impact on financial statements.
• FIFO assumes older items are sold first. LIFO assumes newer items are sold first. Weighted average calculates an average cost. Specific identification tracks actual costs for each unit.
• Specific identification provides the most accurate valuation but is practical only for businesses with unique, identifiable inventory items.
• FIFO (First-In, First-Out) offers realistic cost matching, aligning revenues with older inventory costs for accurate profit representation. It's a tax-savvy method in falling price scenarios, but beware of profit inflation during inflationary periods.
• LIFO (Last-In, First-Out) comes with tax advantages in inflation, reflecting current market prices accurately. However, it may not mirror the actual flow of goods and can pose financial reporting challenges, making comparisons tricky.
• Opt for simplicity with Weighted Average Price, offering ease in calculation and a smoothing effect to mitigate rapid price changes' impact. But be cautious—it may not always capture current market prices accurately, especially in times of significant fluctuations.

Inventory valuation methods, including FIFO, LIFO, Weighted Average Cost (WAC), and Specific Identification, are crucial for assessing the value of a company's inventory for financial reporting. The choice of method depends on factors such as the type of inventory, accounting policies, and the nature of the business. Accurate inventory valuation significantly influences financial statements, profitability, and taxes, as inventory is reported as a current asset on the balance sheet, representing goods available for sale or production. Overvaluation or undervaluation can distort financial performance, highlighting the importance of considering net realizable value—the selling price less costs to sell—for accurate valuation. Effective inventory management and precise valuation are vital for informed decision-making and the long-term success of a business.

Inventory Valuation Methods

Inventory valuation methods refer to the different approaches used to determine the monetary value of the goods held in stock by a business. Accurate inventory valuation is essential for effective financial reporting, profitability analysis, and tax calculations. Common inventory valuation methods include First-In-First-Out (FIFO), Last-In-First-Out (LIFO), Weighted Average Cost (WAC), and Specific Identification.

First-In-First-Out (FIFO)

The FIFO method assumes that the first items purchased are the first items sold. The cost of the oldest inventory is assigned to the cost of goods sold (COGS), while the most recent inventory costs are allocated to ending inventory. This method is especially suitable for businesses dealing with perishable goods with limited shelf life.

Example:

A bakery purchases 100 bags of flour at $10 each in January and another 100 bags at $12 each in February. By March, the bakery sells 120 bags of flour. According to FIFO:

• Cost of the first 100 bags sold: $10 each ($1,000).
• Cost of the remaining 20 bags sold: $12 each ($240).
• Ending inventory value: 80 bags at $12 each ($960).

Last-In-First-Out (LIFO)

The LIFO method assumes that the most recent inventory items purchased are sold first. This means the cost of the newest inventory is allocated to COGS, and the older inventory costs are assigned to ending inventory. LIFO is often used by businesses dealing with non-perishable goods.

Example:

A hardware store purchases 100 hammers at $5 each in January and another 100 at $6 each in February. By March, the store sells 120 hammers. According to LIFO:

• Cost of the first 100 hammers sold: $6 each ($600).
• Cost of the remaining 20 hammers sold: $5 each ($100).
• Ending inventory value: 80 hammers at $5 each ($400).

Weighted Average Cost (WAC)

The WAC method calculates the average cost of all inventory items, regardless of purchase date. The average cost is then applied to both COGS and ending inventory. WAC can be calculated using two approaches: periodic and continuous.

Periodic Weighted Average

The average cost of inventory is calculated at the end of a specific period (e.g., monthly). This method suits businesses with low inventory transaction volumes or manual record-keeping.

Example:

• Beginning inventory: 50 units at $10 each.
• Purchases during the month: 100 units at $12 each.
• Weighted average cost: [(50 x $10) + (100 x $12)] / (50 + 100) = $11.33.
• COGS: Total units sold x $11.33.

Continuous Weighted Average

The average cost is updated after every transaction. This method suits businesses with high transaction volumes or computerized systems.

Example:

• Opening inventory: 50 units at $10 each ($500).
• Sale of 12 units: COGS = $120, inventory = $380.
• Purchase of 150 units at $12 each: New WAC = ($380 + $1,800) / (38 + 150) = $11.60.
• Sale of 100 units: COGS = $1,160, remaining inventory = $1,020.80.

Specific Identification

This method assigns the actual cost of each item to both COGS and ending inventory. It’s best suited for businesses selling high-value, unique items, such as cars or jewelry.

Example:

A car dealership purchases three cars: a red car for $20,000, a blue car for $22,000, and a green car for $25,000. After selling all three:

• COGS: $20,000 for the red car, $22,000 for the blue car, and $25,000 for the green car.
• Ending inventory: $0 (all items sold).

Choosing the Right Method

Each inventory valuation method has distinct advantages and disadvantages, depending on the business’s nature, inventory type, and accounting policies. For example:

• FIFO provides accurate inventory valuation during periods of rising costs but may increase taxes.
• LIFO offers tax benefits in inflationary periods but may not reflect the true cost of inventory.
• WAC simplifies calculations but may lack precision for high-value items.
• Specific Identification ensures accuracy but is resource-intensive.

Impact on Financial Statements

Inventory valuation methods significantly influence a company’s financial statements:

• Income Statement: Different methods affect COGS and gross profit.
• Balance Sheet: Inventory valuation impacts asset valuation and shareholder equity.
• Tax Implications: Inventory valuation affects taxable income, especially in inflationary environments.

Key Takeaways

• Inventory valuation methods determine how inventory costs are allocated between COGS and ending inventory.
• FIFO assumes older inventory is sold first, LIFO assumes newer inventory is sold first, WAC uses an average cost, and Specific Identification assigns exact costs.
• Method selection depends on business needs, inventory type, and accounting policies.
• Accurate inventory valuation impacts profitability, taxes, and financial reporting.

Did you know that how a company values its inventory can drastically affect its reported profits and taxes? Inventory valuation practice is the process of determining the worth of goods or materials available for sale or used in production. Companies calculate this value by comparing the cost of inventory to its net realizable value and applying the lower figure. Choosing an appropriate inventory valuation method, such as FIFO, LIFO, weighted average, or specific identification, plays a critical role in shaping financial statements. Therefore, businesses must carefully analyze their inventory needs to select the method that best fits their operations and ensures accurate reporting of profits and assets.

Inventory Valuation Practice

Inventory includes items such as goods purchased for resale, raw materials, components, and both finished and partially finished products. Accurately valuing inventory is crucial since it directly affects a company’s financial position and performance by influencing the balance sheet and profit calculations.

What is Inventory Valuation?

Inventory valuation practice refers to determining the worth of a company's stock. This process involves valuing inventory at the lower of cost or net realizable value, ensuring compliance with the accounting principle of prudence.

Cost of Inventory: The total cost of inventory includes all expenses incurred in acquiring and preparing it for sale. These costs can be broken down into three categories:

• Cost of Purchase: Purchase price, import duties, and transportation costs, minus trade discounts.
• Cost of Conversion: Direct labor, direct materials, and manufacturing overheads involved in producing goods.
• Other Costs: Costs necessary to bring the inventory to its current condition and location.

Non-inventory-related expenses like administrative overheads, abnormal wastage, and selling costs are excluded from inventory valuation.

Net Realizable Value: The estimated selling price minus any additional costs needed to complete and sell the product.

Example of Inventory Valuation

A manufacturing company produces bicycles with a cost of $200 per unit. The company has 100 bicycles in stock, totaling $20,000 in inventory value. However, due to reduced demand, the expected selling price drops to $180 per bicycle. The net realizable value becomes $18,000. Since this is lower than the cost, the company must adjust its balance sheet to reflect the lower value.

Inventory Valuation Methods

Different methods can be applied to determine the monetary value of inventory. The choice of method impacts the cost of goods sold (COGS) and ending inventory on financial statements.

1. First-In-First-Out (FIFO)

FIFO assumes that the oldest inventory items are sold first. This method is ideal for businesses handling perishable goods.

Example: A bakery purchases 100 bags of flour at $10 each in January and 100 more at $12 each in February. If it sells 120 bags in March, the COGS would be:

• COGS = $1,240 (100 bags at $10 = $1,000 plus 20 bags at $12 = $240)
• Ending inventory: 80 bags at $12 = $960

2. Last-In-First-Out (LIFO)

LIFO assumes that the most recent inventory is sold first. This method suits businesses with non-perishable goods.

Example: A hardware store buys 100 hammers at $5 each in January and 100 more at $6 each in February. If it sells 120 hammers in March, the COGS would be:

• COGS = $1,100 (100 hammers at $6 = $600 plus 20 hammers at $5 = $100)
• Ending inventory: 80 hammers at $5 = $400

3. Weighted Average Cost (WAC)

The WAC method calculates an average cost for all inventory units, applying it to both COGS and ending inventory. Businesses with frequent inventory transactions often use this approach.

There are two WAC approaches:

• Periodic: The average is calculated periodically (e.g., monthly).
• Continuous: The average is updated after every inventory transaction.

Example: A company purchases 50 units at $10 each, then 150 units at $12 each. The continuous weighted average after both purchases is (50×10)+(150×12)/(50+150) = 2300/200 = $11.50 per unit.

4. Specific Identification

This method tracks the actual cost of each inventory item. It is suitable for high-value, unique items like cars or jewelry.

Example: A car dealership tracks the cost of each car sold. If a $20,000 Audi is sold, the exact cost of that car is assigned to COGS.

Impact of Inventory Valuation Methods

The method a business uses for inventory valuation can significantly affect its reported profits and net assets.

Example: A company has 100 units in beginning inventory at $5 each, buys 200 more at $6 each, and sells 250 units. Using different methods results in varying financial outcomes:

• FIFO: COGS = (100×5)+(150×6)=1,400; Ending Inventory = (50×6)=300.
• LIFO: COGS = (200×6)+(50×5)=1,450; Ending Inventory = (50×5)=250.
• Weighted Average: COGS = 250×5.67=1,417.50; Ending Inventory = 50×5.67=283.50

These differences can influence a company's taxable income and financial ratios.

Choosing the Right Valuation Method

Each inventory valuation method has advantages and disadvantages. Businesses must consider their industry, inventory type, and accounting policies when selecting a method. For example:

• FIFO provides higher profits during inflation but increases taxes.
• LIFO lowers taxable income during inflation but may not reflect current inventory costs.
• WAC simplifies inventory tracking, especially for high-volume businesses.
• Specific Identification offers accuracy but requires detailed tracking systems.

Key Takeaways

• Inventory valuation practice involves determining the worth of stock at the lower of cost or net realizable value.
• Costs included in inventory valuation are purchase costs, conversion costs, and handling expenses.
• Common valuation methods include FIFO, LIFO, WAC, and Specific Identification.
• The choice of method impacts financial statements, tax obligations, and business performance.
• Companies must align their method choice with business needs and regulatory requirements.

The FIFO (First-In, First-Out) Inventory Method is a foundational approach used in inventory accounting and stock management. It operates on the principle that the oldest inventory items are sold or used first, reflecting the natural flow of goods in many industries—particularly those dealing with perishables or technology where obsolescence is a concern.

FIFO is not only a practical method for physical inventory control, but also plays a critical role in financial reporting, tax planning, and compliance with accounting standards like GAAP and IFRS.

How the FIFO Method Works

Under FIFO, the inventory acquired first is the first to leave the warehouse or be recorded as sold. This chronological cost flow assumption aligns with real-world scenarios—such as selling older produce before newer stock in a grocery store.

Operational Logic

In practice:

• Inventory costs are layered by purchase date.
• The cost of the oldest available inventory is assigned to Cost of Goods Sold (COGS) when a sale occurs.
• Newer inventory remains on the balance sheet, affecting the company’s reported asset values.

Financial Implications of FIFO

FIFO significantly influences financial outcomes based on market conditions:

• During inflation, older (cheaper) inventory is sold first, leading to:
• During deflation, the effect is reversed:

These outcomes directly impact financial reporting and strategic decision-making, including pricing, budgeting, and shareholder communications.

FIFO Calculation: Step-by-Step

To calculate COGS under FIFO:

1. Identify the cost of the oldest inventory available at the time of sale.
2. Apply that cost to the number of units sold, starting with the oldest stock.
3. If additional units were sold, continue with the next oldest inventory tier, repeating the process.

FIFO Method Example: Hardware Store Scenario

A real-world example illustrates FIFO in action:

• January: Purchase 100 hammers @ $10 each
• February: Purchase 200 hammers @ $12 each
• March: Sell 150 hammers

COGS calculation under FIFO:

• First 100 hammers from January = 100 × $10 = $1,000
• Next 50 hammers from February = 50 × $12 = $600
• Total COGS = $1,000 + $600 = $1,600

Ending Inventory: 150 hammers @ $12 = $1,800

This approach ensures that the financial records match the physical inventory flow and maintains consistency in valuation.

Advantages of FIFO

• Intuitive and logical: Mirrors the real-world movement of inventory.
• Compliance-friendly: Accepted under both GAAP and IFRS.
• Accurate balance sheet valuation: Newer inventory reflects current market prices.
• Improved profitability during inflation due to lower historical costs assigned to COGS.

Disadvantages of FIFO

• Higher tax liability in periods of rising prices.
• Distorted profit margins during extreme price fluctuations.
• May not match the actual flow of goods in businesses that use LIFO warehousing systems.

FIFO Beyond Physical Goods

FIFO is also relevant in:

• Financial asset accounting: Applied to sales of stocks, bonds, and cryptocurrency.
• Portfolio management: Helps determine realized gains and losses.
• Cryptocurrency taxation: Used in jurisdictions where cost-basis reporting is mandatory.

In these areas, FIFO influences capital gains reporting, particularly under IRS or international tax regimes.

Common Misconceptions About FIFO Inventory Method

1. "FIFO always leads to higher profits."
2. Not always. During deflation, older (more expensive) inventory is sold first, reducing profit margins.
3. "FIFO only applies to physical inventory."
4. False. It is also critical in accounting for financial instruments, where the order of acquisition impacts taxable outcomes.
5. "FIFO is suitable for all industries."
6. Not entirely. In industries with volatile pricing or strategic warehousing practices, other methods like LIFO or Weighted Average may be more appropriate.

Compliance with Accounting Standards

FIFO is:

• Fully permitted under GAAP and IFRS
• Recommended in industries where inventory moves quickly or spoils easily (e.g., food, pharmaceuticals)
• Often mandated for tax reporting consistency in certain countries

Note: LIFO is not permitted under IFRS, making FIFO the global standard for many multinational firms.

Choosing FIFO: Strategic Considerations

Businesses should evaluate FIFO in the context of:

• Tax strategy
• Pricing policy
• Regulatory compliance
• Inventory shelf life
• Technological obsolescence risk

A strategic inventory policy should align with the company’s financial objectives, risk exposure, and reporting obligations.

FAQs about FIFO Inventory Method

Is FIFO better than LIFO? There’s no universal answer. FIFO is better in inflationary environments for financial clarity, while LIFO may reduce tax burden under U.S. GAAP.

Can companies mix FIFO and LIFO? Yes, but not for the same inventory pool. Separate categories can use different methods if consistent and well-documented.

How does FIFO affect financial statements? It generally results in higher ending inventory values and lower COGS during periods of rising prices, thereby increasing reported profits.

Key Takeaways

• FIFO assumes the oldest inventory is sold first.
• It’s widely used in both operational and financial settings.
• FIFO leads to higher net income during inflation, but higher tax obligations.
• It is compliant with both GAAP and IFRS, unlike LIFO.
• FIFO applies not only to physical goods but also to financial assets.
• Strategic use of FIFO can influence pricing, profitability, and compliance.

FIFO vs. LIFO: In inventory accounting, FIFO (First-In, First-Out) and LIFO (Last-In, First-Out) are two essential valuation methods that can significantly affect a company’s cost of goods sold (COGS), inventory balance, tax liability, and financial reporting. While the terms may sound technical, understanding how each method works—and when to use them—is crucial for business owners, finance teams, and accounting professionals.

This guide explains both FIFO and LIFO in detail, provides a realistic example, debunks common myths, and explores their practical, financial, and regulatory implications to help you make informed inventory decisions.

What Is FIFO (First-In, First-Out)?

FIFO assumes that the oldest inventory items are sold first. It aligns closely with the natural flow of goods, especially in industries with perishable products (e.g., food, medicine). FIFO is favored for its simplicity, alignment with physical flow, and compliance with both U.S. GAAP and IFRS.

Key Features of FIFO:

• Lower COGS during inflationary periods
• Higher gross and net income
• Inventory on balance sheet reflects recent (higher) purchase prices
• Common in industries with high inventory turnover

What Is LIFO (Last-In, First-Out)?

LIFO assumes that the most recently acquired inventory is sold first. It is often used in industries where inventory doesn't spoil or age quickly (e.g., manufacturing, construction supplies). LIFO is permitted under U.S. GAAP, but not allowed under IFRS.

Key Features of LIFO:

• Higher COGS during inflation
• Lower reported profits, reducing taxable income
• Ending inventory reflects older, often outdated costs
• Common among U.S.-based businesses for tax deferral advantages

Real-World Example: FIFO vs. LIFO in Practice

Scenario: A company purchases 100 units in January at $10 each and 100 units in February at $15 each. In March, it sells 150 units.

Using FIFO:

• Sells 100 units from January ($10) and 50 units from February ($15)
• COGS = (100 × $10) + (50 × $15) = $1,000 + $750 = $1,750
• Inventory value = 50 units from February × $15 = $750

Using LIFO:

• Sells 100 units from February ($15) and 50 units from January ($10)
• COGS = (100 × $15) + (50 × $10) = $1,500 + $500 = $2,000
• Inventory value = 50 units from January × $10 = $500

Impact: The method you choose affects COGS, inventory valuation, profitability, and income taxes. Under inflation, LIFO reports higher COGS and lower profit—reducing tax liability but also appearing less profitable.

Business Application and Decision Factors

When FIFO Makes Sense:

• Your inventory is perishable or time-sensitive
• You want to show higher profits during inflation, as FIFO assigns older (cheaper) costs to goods sold, increasing net income and present a more favorable balance sheet
• You operate in IFRS-compliant jurisdictions (e.g., Europe, Asia)

When LIFO Is Preferred:

• You seek tax advantages during inflation
• Your inventory has a long shelf life
• You operate under U.S. GAAP, where LIFO is permitted

Debunking Common Misconceptions: FIFO vs. LIFO

Myth: "FIFO and LIFO dictate the physical flow of goods."Fact: These are accounting assumptions only. The actual movement of inventory can follow any pattern, regardless of the valuation method used.

Myth: "LIFO always leads to tax savings."Fact: While it can reduce taxable income during inflation, in a deflationary environment, LIFO may increase taxes and distort earnings.

Myth: "Switching methods is easy."Fact: Regulatory frameworks, such as the IRS’s LIFO conformity rule, limit how and when a business can change its method.

Regulatory and Accounting Considerations

• U.S. GAAP permits both FIFO and LIFO. Businesses must follow IRS Form 970 to adopt LIFO and maintain LIFO conformity across financial and tax reporting.
• IFRS prohibits LIFO, making FIFO or weighted-average methods more common globally.
• Frequent switching is discouraged and may attract scrutiny for earnings manipulation.

FAQs: FIFO vs. LIFO

Can companies switch between FIFO and LIFO? Yes, but they must follow strict accounting standards and regulatory disclosures. The IRS requires consistent application and proper notification.

Is one method better than the other? Neither method is universally superior. It depends on economic conditions, inventory characteristics, and reporting goals.

How do inventory valuation methods affect financial ratios? They impact gross margin, net income, inventory turnover, and return on assets, altering how investors perceive company health.

Key Takeaways

• FIFO assumes the oldest inventory is sold first, resulting in lower COGS and higher profits during inflation.
• LIFO assumes the most recent inventory is sold first, leading to higher COGS and lower profits, often used to defer taxes in inflationary economies.
• FIFO is allowed under both GAAP and IFRS, while LIFO is only permitted under U.S. GAAP.
• Inventory valuation choices affect financial statements, tax obligations, and investor perception.
• Choose based on business model, jurisdiction, and long-term financial strategy—not just short-term profit considerations.

In business accounting and financial reporting, choosing the right inventory costing method significantly affects a company’s profitability, tax liability, and inventory valuation. One widely used and practical method is the Weighted Average Cost Flow Assumption (WACFA). This guide delivers a comprehensive, real-world explanation of WACFA, its calculations, practical applications, benefits, limitations, and how it compares to alternative methods.

What Is the Weighted Average Cost Flow Assumption?

WACFA is an inventory costing method where both the Cost of Goods Sold (COGS) and ending inventory are valued using the average cost of all goods available for sale during a specific period. Unlike FIFO or LIFO, which assign cost based on the order of inventory movement, WACFA smooths out price fluctuations by evenly distributing costs across all units.

This method is especially useful when inventory items are indistinguishable or intermingled—such as fuel, chemicals, or components purchased in bulk.

How Is Weighted Average Cost Calculated?

The calculation follows a straightforward formula:

Weighted Average Cost per Unit = Total Cost of Goods Available for Sale / Total Units Available for Sale

This per-unit average is then applied to determine:

• COGS = Number of units sold × Average cost per unit
• Ending Inventory = Number of units remaining × Average cost per unit

Illustrative Example: A Retail Scenario

Imagine a fashion retailer purchasing T-shirts in two separate shipments:

• 100 units at $5 each → $500
• 150 units at $7 each → $1,050
• Total units = 250, Total cost = $1,550

Weighted average cost per unit = $1,550 / 250 = $6.20

If 200 shirts are sold during the period:

• COGS = 200 × $6.20 = $1,240
• Ending inventory = 50 × $6.20 = $310

This method stabilizes reported expenses, especially during periods of fluctuating purchase costs.

Real-World Applications

WACFA is commonly used in industries where:

• Inventory is not easily distinguishable by batch or age
• Stock is purchased at varying prices
• Accurate, timely inventory tracking is critical

Examples:

• Manufacturing: For bulk materials like nuts, bolts, chemicals
• Retail: Fast-moving consumer goods, where stock is constantly replenished
• Energy sector: Fuel, gas, and liquids stored in large quantities

Many companies use perpetual inventory systems, where the weighted average cost is recalculated after each purchase. Others use periodic systems, updating average cost at the end of each period.

Financial Statement Impact

Using WACFA can significantly influence:

• Gross profit and net income
• Tax liability
• Inventory turnover ratios
• Balance sheet valuation

It provides a middle-ground valuation between FIFO (which increases income during inflation) and LIFO (which decreases income and taxes during inflation, but may not be allowed under certain standards like IFRS).

However, since WACFA smooths out cost variances, it may understate or overstate profits depending on market volatility.

WACFA Under GAAP and IFRS

Both Generally Accepted Accounting Principles (GAAP) and International Financial Reporting Standards (IFRS) permit the use of WACFA. It is considered a neutral and consistent method appropriate for many businesses, provided it is applied consistently year to year.

Refer to:

• FASB ASC 330– Inventory
• IAS 2– Inventories

Common Misconceptions

• "WACFA lowers taxes during inflation"
• Not always true. It depends on timing, the rate of inflation, and whether price increases are sustained or temporary.
• "WACFA is the most accurate"
• While balanced, it may distort true cost if inventory is highly volatile in price.
• "WACFA reflects actual flow"
• No. It does not align with the physical movement of goods, unlike FIFO.

WACFA vs. FIFO vs. LIFO

When Should You Use WACFA?

WACFA is ideal when:

• You deal with bulk or fungible goods
• Price fluctuations are frequent but moderate
• You prefer consistency and simplicity in reporting
• You want to reduce income manipulation risk tied to timing purchases

Frequently Asked Questions

A: It works best for indistinguishable or homogenous goods, not customized or serialized products.

A: Yes, though the average is recalculated with each purchase in such systems.

A: Yes under both GAAP and IFRS, unlike LIFO which is not permitted under IFRS.

Key Takeaways

• WACFA assigns average cost to both sold and remaining inventory.
• It is suitable for indistinguishable, high-volume items.
• It provides stability in COGS and ending inventory, avoiding extreme swings.
• It does not reflect physical flow, and can distort values during extreme inflation/deflation.
• WACFA is accepted under GAAP and IFRS, offering consistency and simplicity.
• Ideal for industries needing balanced cost reporting without detailed batch tracking.

Learning objectives

By the end of this chapter you should be able to:

• Explain FIFO and weighted average as inventory cost-flow methods and describe how each affects profit and inventory values.
• Calculate cost of sales and closing inventory using FIFO and the periodic weighted average method.
• Identify which costs belong in inventory cost and which costs should be expensed.
• Apply good exam technique to avoid common errors, including incorrect batch allocation, early rounding, and weak reconciliations.

Overview & key concepts

Inventory valuation matters because it determines two headline numbers:

• Closing inventory (an asset on the statement of financial position)
• Cost of sales (an expense in the statement of profit or loss)

These two figures are linked: for a given set of purchases, if closing inventory is higher, cost of sales is lower (and gross profit is higher), and vice versa.

Lower of cost and NRV

In exam questions, inventory is normally reported at the lower of:

• cost, and
• net realisable value (NRV)— what the inventory is worth in a sale scenario at the reporting date: start with the expected selling price, then deduct (i) any further costs needed to finish or prepare the item for sale and (ii) any unavoidable selling costs needed to complete the sale.

Only treat delivery as a selling cost for NRV where delivery is necessary to make the sale (for example, it is required by the sales contract), rather than routine distribution.

If NRV falls below cost, the item is written down so inventory is not overstated. If NRV later improves, earlier write-downs may be reversed, but only up to the amount previously written down.

FIFO (first in, first out)

FIFO allocates costs on the assumption that the earliest costs are issued (sold) first. As a result:

• Cost of sales tends to reflect earlier purchase prices.
• Closing inventory tends to be priced at the most recent purchase costs.

In a period of rising prices, FIFO often produces higher closing inventory and higher gross profit (because older, cheaper costs flow into cost of sales).

Weighted average

Weighted average produces a single average cost per unit and uses it to value:

• units sold (cost of sales), and
• units remaining (closing inventory).

Two versions are commonly seen:

• Periodic weighted average: compute one average for the whole period (typical in questions that value inventory at period end).
• Moving (perpetual) weighted average: update the average after each purchase (used where records are updated continuously).

This chapter’s worked example uses the periodic method.

Cost-flow methods vs physical movement

FIFO and weighted average are cost allocation methods. They describe how costs are assigned to sales and closing inventory. They do not have to match how goods physically move through a warehouse.

Core theory and frameworks

Which costs form part of inventory cost?

Think of inventory cost as: (1) what you pay to buy or make it, plus (2) what you must spend to get it ready for sale in your business.

• For a retailer, this is mainly purchase-related costs (after trade discounts) and getting goods into the business (for example freight-in).
• For a manufacturer, this also includes conversion costs, such as direct labour and production overheads.

Production overheads are included using a sensible absorption approach: variable production overheads are typically absorbed based on actual production, while fixed production overheads are spread based on normal activity/capacity (so unit costs are not distorted by unusual highs or lows in output).

Include (typical items)

• purchase price (net of trade discounts/rebates)
• non-refundable import duties and similar taxes
• carriage inwards/freight-in and handling directly related to purchases
• costs of converting goods (where applicable): direct labour and production overheads appropriately absorbed

Exclude (typical items)

• carriage outwards/delivery to customers (routine distribution)
• sales commissions, marketing and advertising
• storage after production or purchase (unless it is unavoidable in the production process)
• general administration not linked to making or preparing inventory
• abnormal losses (see below)

Carriage inwards and abnormal waste

• Carriage inwards is normally included in inventory cost because it is part of acquiring goods into the business.
• Abnormal waste (unusual spoilage, damage, or loss beyond what is expected in normal operations) is charged as an expense in the period, not added to inventory cost.

FIFO methodology (periodic valuation)

Under FIFO, you allocate sales using the earliest available purchase costs first:

1. List purchases in date order (batches).
2. Issue units sold starting from the oldest batch and work forward.
3. Value closing inventory using the costs of the most recent unsold batches.

Periodic weighted average methodology

Under periodic weighted average:

1. Compute total units available for sale during the period.
2. Compute total cost of units available for sale.
3. Average cost per unit = total cost ÷ total units.
4. Value:

Rounding: keep sufficient decimals during workings (for example 3–4 dp, or carry the unrounded fraction in your calculator) and round final figures as required by the question.

Double-entry logic (what the valuation affects)

Inventory valuation determines how the total cost of goods available for sale is split between:

• cost of sales (expense), and
• closing inventory (asset).

Under a system with continuous inventory records, cost of sales may be recorded as each sale is made. Under a periodic approach, the financial statements are adjusted at the end of the period to recognise closing inventory and derive cost of sales. Whichever approach is used, the final outcome must be:

• closing inventory shown as an asset, and
• cost of sales recognised as an expense for the period.

Impact on financial statements

Because cost of sales affects gross profit, different cost-flow methods can change reported performance even when sales volumes are identical. When prices rise:

• FIFO often gives lower cost of sales and higher inventory than weighted average.
• Weighted average often produces results between older and newer purchase costs.

Borderline cases

Questions may include complications such as:

• mixed batches and partial issues,
• purchase returns,
• sales returns,
• write-downs to NRV and reversals.

Always apply the approach specified in the question and the entity’s stated policy. For NRV comparisons, apply item-by-item or groupingas instructed (and then keep the approach consistent).

Worked example

Narrative scenario

A retail business in the UK sells electronic gadgets. It uses a periodic inventory system and needs to value inventory at the end of January. The following transactions occurred:

• 3 January: Purchased 100 units at £8 each
• 10 January: Sold 50 units
• 15 January: Purchased 80 units at £9 each
• 20 January: Sold 60 units
• 25 January: Purchased 70 units at £10 each
• 30 January: Sold 40 units

A physical count on 31 January shows 100 units of inventory remaining.

Required

1. Calculate cost of sales using FIFO.
2. Calculate closing inventory value using FIFO.
3. Calculate cost of sales using the periodic weighted average method.
4. Calculate closing inventory value using the periodic weighted average method.
5. Compare the results and explain the impact on the financial statements.

Solution

1–2 FIFO

Units available for sale

• 100 @ £8
• 80 @ £9
• 70 @ £10
• Total units = 250

Units sold = 50 + 60 + 40 = 150 Closing units = 250 − 150 = 100 (matches the physical count)

FIFO cost of sales

Sale on 10 January: 50 units

• 50 from 3 Jan batch @ £8 = 50 × 8 = £400

Sale on 20 January: 60 units

• Remaining from 3 Jan batch: 100 − 50 = 50 units @ £8 → 50 × 8 = £400
• Balance needed: 10 units from 15 Jan batch @ £9 → 10 × 9 = £90
• Cost for this sale = £490

Sale on 30 January: 40 units

• From 15 Jan batch (after issuing 10 units): remaining 80 − 10 = 70 units @ £9
• Issue 40 @ £9 → 40 × 9 = £360

Total FIFO cost of sales £400 + £490 + £360 = £1,250

FIFO closing inventory

After all sales, remaining inventory is:

• From 15 Jan batch: 70 − 40 = 30 units @ £9 → 30 × 9 = £270
• From 25 Jan batch: 70 units @ £10 → 70 × 10 = £700

Total FIFO closing inventory = £270 + £700 = £970

Check: £1,250 + £970 = £2,220 (matches total goods cost available for sale)

3–4 Periodic weighted average

Average cost per unit

Total units available = 100 + 80 + 70 = 250 units

Total cost = (100 × £8) + (80 × £9) + (70 × £10) = £800 + £720 + £700 = £2,220

Average cost per unit = £2,220 ÷ 250 = £8.88 (exact to 2 dp; in other questions, keep more decimals if the division does not terminate neatly)

Weighted average cost of sales

Units sold = 150 Cost of sales = 150 × £8.88 = £1,332

Weighted average closing inventory

Closing units = 100 Closing inventory = 100 × £8.88 = £888

Check: £1,332 + £888 = £2,220

5 Comparison and impact on the financial statements

Here prices rise over the month (£8 → £9 → £10). FIFO assigns more of the earlier, cheaper costs to sales, so:

• FIFO cost of sales is lower, giving higher gross profit (all else equal).
• FIFO closing inventory is higher, because the remaining units are priced closer to the latest purchase costs.

Weighted average spreads the price changes across all units, producing results between the oldest and newest costs. This often leads to less volatility in gross profit and inventory values from period to period.

Common pitfalls and misunderstandings

• Batch allocation errors under FIFO: always issue from the oldest available batch and keep a running balance of units remaining in each layer.
• Confusing periodic and continuous records: in periodic questions, valuation is done at period end using total units and costs for the period.
• Including selling or distribution costs in inventory: routine delivery to customers is a selling expense, not part of inventory cost.
• Early rounding in weighted average: keep sufficient decimals during workings and round final figures as required.
• Not reconciling totals: always check that total cost available for sale equals cost of sales plus closing inventory.
• Incorrect treatment of abnormal losses: unusual wastage is expensed, not capitalised into inventory.
• Recoverable sales taxes misunderstood: where sales taxes on purchases are recoverable from the tax authority, they are treated as a receivable (or offset against the tax liability), not included in inventory cost.
• Returns handled inconsistently: returns affect the units and costs available and therefore affect FIFO layers or the weighted average cost.

Summary and further reading

FIFO and weighted average are widely used cost-flow methods for assigning purchase or production costs between cost of sales and closing inventory. FIFO tends to reflect the latest prices in closing inventory and, when prices rise, often results in higher gross profit than weighted average. Weighted average blends price changes across the period, reducing volatility.

Inventory is reported at the lower of cost and NRV. If NRV falls below cost, inventory is written down; if NRV subsequently improves, write-downs can be reversed, subject to the limit of the original write-down.

FAQ

Why can FIFO increase reported profit when prices are rising?

When purchase prices rise over time, FIFO allocates earlier (lower) costs to cost of sales first. Lower cost of sales means higher gross profit, assuming sales revenue is unchanged. The remaining inventory is then priced closer to the latest purchase costs, increasing the inventory asset.

How does weighted average reduce volatility in results?

Weighted average blends all purchase prices into a single cost per unit. This reduces the effect of sharp price movements on cost of sales and closing inventory, which can make gross profit and inventory balances more stable from one period to the next.

Which method produces the “best” inventory value?

Neither method is universally “best”. FIFO can make closing inventory closer to recent purchase prices, while weighted average produces a blended measure. The key is consistent application and clear, supportable workings.

How are write-downs and reversals tested in inventory questions?

You may be asked to compare cost with NRV item-by-item, or using a grouping approach, as instructed in the question and applied consistently. If NRV is lower, inventory is written down and the write-down is recognised as an expense. If NRV later increases, the write-down may be reversed, but only up to the original amount written down.

What checks should I do before finalising my numbers?

• Confirm: units purchased − units sold = units in closing count.
• Confirm: total cost available for sale = cost of sales + closing inventory.
• Confirm: included costs relate to acquiring/producing inventory and preparing it for sale (not selling or distribution).

Summary (Recap)

This chapter explained how FIFO and weighted average allocate costs between cost of sales and closing inventory. FIFO issues the earliest costs first and often increases gross profit when prices rise, while weighted average spreads price changes across all units. Inventory is then reported at the lower of cost and NRV, including write-downs when NRV is lower and permitted reversals when NRV improves, limited to the original write-down. The worked example demonstrated both methods under a periodic approach and reinforced key technique: disciplined layers/averages, careful rounding, and full reconciliation.

Glossary

FIFO (first in, first out) A cost-flow method that assigns the earliest purchase or production costs to units sold first. Closing inventory is valued using the costs of the most recent unsold units.

Weighted average A method that calculates an average cost per unit and applies it to units sold and units remaining. Under the periodic approach, one average is calculated for the entire period.

Cost of sales The cost assigned to goods sold during the period. It is deducted from revenue to arrive at gross profit.

Closing inventory Unsold goods at the reporting date, shown as an asset and measured using an inventory cost method, then compared with NRV for any necessary write-down.

Carriage inwards Costs of bringing purchases into the business (freight-in/transport on purchases). Typically included in inventory cost.

Abnormal waste Unusual losses beyond the level expected in normal operations. Treated as an expense rather than added to inventory cost.

Net realisable value (NRV) What inventory is worth in a sale scenario at the reporting date: expected selling price less any remaining completion/preparation costs and less unavoidable selling costs needed to complete the sale.

Periodic inventory system A system where purchases are recorded during the period and cost of sales is determined at period end using an inventory valuation adjustment.

Moving (perpetual) weighted average A weighted average approach that updates the average cost per unit after each purchase as inventory records are maintained continuously.

Cost-flow assumption A method used to assign costs to units sold and units remaining (for example FIFO or weighted average). It is an allocation method and may differ from the physical movement of goods.