Labour: Measuring and Posting Costs

Learning objectives

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

• Distinguish between direct and indirect labour in a manufacturing or job-costing setting, based on whether the cost is traceable to a specific job or cost unit.
• Explain how labour information flows from source documents (time recording, time booking, payroll summaries) into the cost ledger and general ledger.
• Calculate labour cost components, including basic pay, overtime and employer on-costs, and classify them appropriately for product costing and reporting.
• Post labour costs using double-entry, charging direct labour to Work in Progress (WIP) and treating indirect labour as production overhead.
• Classify idle time and training time, distinguishing normal vs abnormal, and reflect the correct accounting treatment.
• Describe practical labour cost control measures and common performance indicators used to manage labour cost and productivity.

Overview & key concepts

In manufacturing and job-costing systems, labour is often one of the largest controllable costs. How labour is measured and posted affects:

• Inventory valuation(through WIP and finished goods)
• Cost of sales(when goods are sold)
• Profitability(through overhead absorption and any abnormal costs)

In a manufacturing system, product cost is built from the costs needed to get units through the factory and into a saleable condition. That usually means direct materials, direct labour spent on production work, and an appropriate share of factory overheads. Costs that are not part of running the factory (such as selling and most administrative costs) are treated as period expenses. Also, if costs arise from abnormal disruption or inefficiency, they are written off to profit or loss rather than being carried in inventory.

Direct vs indirect labour

Direct labour

Direct labour is the cost of employees whose time can be identified with a specific job, product, batch, or cost unit. Examples include machine operators, assemblers, and skilled makers working on customer jobs.

Costing treatment: charged to WIP (a production inventory account) because it contributes to goods being made.

Indirect labour

Indirect labour supports production but is not traceable to a single job in an economically sensible way. Examples include factory supervision, maintenance staff, stores support, and production planning.

Costing treatment: treated as production overhead and later allocated/absorbed across jobs using an overhead basis.

Labour source documents and information flow

A reliable labour costing system depends on clear source documentation and controls.

1) Time recording (attendance)

Shows how long people were present:

• clock cards
• swipe systems
• biometric logs

Purpose: supports payroll accuracy and prevents paying for time not worked.

2) Time booking (allocation of time)

Shows how time was spent:

• job cards / time sheets
• terminal job booking
• cost centre booking

Purpose: assigns labour time to jobs (direct) or to departments/support (indirect).

3) Payroll summary (pay calculation)

Summarises pay and deductions:

• gross wages
• deductions (tax, employee pension, other withholdings)
• net pay
• employer on-costs (employer payroll taxes, employer pension, etc.)

Purpose: provides the totals used for accounting entries.

4) Labour distribution summary (cost ledger posting)

A reconciliation that distributes labour cost between:

• WIP (direct productive labour)
• production overhead (indirect, training, normal idle time, overtime premiums where appropriate)
• abnormal cost (income statement)

Purpose: ensures costs are charged to the correct destination.

Flow diagram (for quick revision)

Time recording → Time booking → Payroll summary → Labour distribution → WIP / Overhead / Abnormal cost (P&L)

Building labour costs

Labour cost for costing and reporting typically includes:

Basic pay

Hours × rate (or agreed salary amounts).

Overtime

Overtime is often paid at a higher rate. For costing, separate the overtime into:

• The basic element(the normal hourly rate), which is still a production labour cost, and
• The premium element(the extra above basic rate), which is treated depending on the cause:

If overtime is worked specifically because a particular job requires it (for example, a rush order requested by a customer), the premium is commonly charged to that job. If overtime arises from general inefficiency, poor planning, or congestion, the premium is more commonly treated as overhead (or, if clearly exceptional, written off as an abnormal cost).

Employer on-costs

These are additional employer costs of labour, such as employer payroll taxes and employer pension contributions.

For costing, on-costs are normally assigned in the same pattern as the wages they relate to:

• on-costs on direct production wages →WIP
• on-costs on indirect wages →overhead
• on-costs on abnormal idle wages →abnormal cost

Posting and cost accumulation

A clear posting structure supports reconciliation and reduces errors.

Common control accounts

Many systems use control accounts before allocating costs:

• Wages control (gross wages)
• Employer on-costs control
• WIP
• Production overhead
• Abnormal cost / abnormal idle time expense(income statement)

This allows you to:

1. record payroll totals accurately, and
2. distribute them to jobs/cost centres using the labour distribution summary.

Idle time and training time

Idle time

Idle time occurs when employees are paid but are not producing output (e.g., waiting for materials, machine breakdown, power outages).

• Normal idle time: expected within operations (e.g., short stoppages, routine setup delays).
  • Treatment: included withinproduction overheadand absorbed into product cost across output.
• Abnormal idle time: unusual and avoidable (e.g., major disruption, exceptional breakdown).
  • Treatment: charged toabnormal costin profit or loss (not included in inventory).

Exam marker tip: Always label idle time as normal or abnormal, then state clearly whether it goes to overhead (normal) or profit or loss (abnormal).

Training time

Training time often cannot be traced to a specific job output.

• Factory/production-related training(e.g., machine training for production staff): usually treated asproduction overhead.
• Non-production training(e.g., general HR, compliance, leadership, finance systems): normally treated as anadministrative period costand expensed in the period.

Labour cost control and performance

Effective labour management combines cost control with productivity monitoring.

Common measures include:

• Output per labour hour(or labour hours per unit)
• Labour utilisation(productive hours ÷ paid hours)
• Overtime levels(hours and premium cost)
• Absenteeism and turnover(drivers of inefficiency and recruitment/training cost)

Variance analysis is frequently used in standard costing systems:

• Rate variance: difference between actual and expected wage rates
• Efficiency variance: difference between actual hours used and expected hours for the output achieved

Payroll controls and fraud risks

Payroll is vulnerable because it involves regular payments and large volumes.

Strong controls typically include:

• segregation between hiring/authorisation, payroll calculation, and payment processing
• controlled joiner/leaver processes with documented approvals
• periodic reconciliation of payroll totals to accounting records
• review of changes to pay rates, bank details, and overtime approvals
• independent headcount checks (to reduce “ghost employee” risk)

Core theory and frameworks

Where labour costs “go” in a manufacturing system

• WIP: direct production labour (and related on-costs) assigned to jobs/products being made
• Production overhead: indirect labour, factory-related training time, normal idle time, and other factory support costs
• Abnormal cost (P&L): abnormal idle time and exceptional inefficiencies that should not be carried in inventory
• Administrative period cost (P&L): non-production training and other non-factory labour costs

Double-entry logic (high level)

Record payroll totals from the payroll summary:

• gross wages and the split between deductions and net pay payable
• employer on-costs liabilities

Distribute labour cost to its destination:

• WIP / overhead / abnormal cost (and admin period costs where relevant)

When paid:

• reduce the relevant payable and credit bank

Worked example

Narrative scenario

ABC Manufacturing produces custom furniture using a job-costing system. The business employs both direct and indirect labour. Time cards record attendance and job cards allocate productive time to jobs.

During the month:

• Carpenters worked1,200 basic hoursat$20 per hour.
  • Included within the 1,200 basic hours:50 hours normal idle timeand40 hours factory training time.
• Carpenters also worked100 overtime hoursat$30 per hour(worked on customer jobs).
• Upholsterers worked800 hoursat$18 per hour.
  • Included within the 800 hours:20 hours abnormal idle time.
• Factory supervisors earned$5,000for the month.
• Maintenance staff earned$3,000for the month.
• Employer payroll taxes and employer pension contributions are15% of gross wages.
• Total deductions from employees’ pay for the month are$10,000.

Required

1. Calculate the total direct labour cost for the month (productive time only).
2. Calculate the total indirect labour cost for the month (including factory training and normal idle time).
3. Determine suitable loaded labour rates for carpenters.
4. Prepare journal entries to record and allocate labour costs.
5. Classify and treat idle time and training time.
6. Explain the impact of these postings on inventory and profit.

Solution

1) Gross wages analysis (by category)

Carpenters (basic hours)

• Total basic wages: 1,200 × $20 =$24,000

Split basic hours:

• Normal idle time wages: 50 × $20 =$1,000(overhead)
• Factory training time wages: 40 × $20 =$800(overhead)
• Productive basic wages: (1,200 − 50 − 40) = 1,110 hours × $20 =$22,200(direct)

Carpenters (overtime hours)

• Overtime wages: 100 × $30 =$3,000(direct in this scenario)

Upholsterers (total hours)

• Total wages: 800 × $18 =$14,400

Split hours:

• Abnormal idle wages: 20 × $18 =$360(abnormal cost)
• Productive wages: (800 − 20) = 780 hours × $18 =$14,040(direct)

Indirect labour (salaried/support)

• Supervisors:$5,000(overhead)
• Maintenance:$3,000(overhead)

Check: total gross wages

• Direct productive wages: 22,200 + 3,000 + 14,040 =$39,240
• Overhead wages: 1,000 + 800 + 5,000 + 3,000 =$9,800
• Abnormal cost wages:$360

Total gross wages = 39,240 + 9,800 + 360 = $49,400

2) Employer on-costs (15% of gross wages)

Total employer on-costs = 15% × 49,400 = $7,410

Allocate on-costs in the same pattern as the wages:

• On-costs on direct wages: 15% × 39,240 =$5,886(to WIP)
• On-costs on overhead wages: 15% × 9,800 =$1,470(to overhead)
• On-costs on abnormal wages: 15% × 360 =$54(to abnormal cost)

Check: 5,886 + 1,470 + 54 = $7,410

3) Direct labour cost (productive time only)

Direct labour cost charged to WIP includes:

• productive direct wages + related employer on-costs

Direct labour cost to WIP = (39,240 + 5,886) = $45,126

4) Indirect labour cost (production overhead)

Indirect labour cost includes:

• supervisors and maintenance
• factory training time wages
• normal idle time wages
• related employer on-costs

Overhead labour cost = (9,800 + 1,470) = $11,270

5) Loaded labour rates for carpenters

A common approach is to build a loaded rate by adding employer on-costs to the wage rate.

Basic carpenter hour (loaded)

• Wage rate: $20
• On-costs: 15% × $20 = $3
• Loaded basic rate =$23 per basic hour

Overtime carpenter hour (loaded)

• Overtime wage rate: $30
• On-costs: 15% × $30 = $4.50
• Loaded overtime rate =$34.50 per overtime hour

Many organisations either (a) keep normal idle time and factory training time in overhead (so the productive labour rate is not inflated) or (b) spread those costs by increasing the productive-hour charge-out rate. This example uses approach (a).

Exam marker tip: When overtime appears, split your thinking into basic element and premium element, then state where the premium goes and why.

6) Journal entries for posting labour costs

Use control accounts to record payroll totals, then distribute labour costs to WIP/overhead/abnormal cost.

(a) Record gross wages and deductions (from the payroll summary)

Gross wages: $49,400
Deductions: $10,000
Net pay payable: 49,400 − 10,000 = $39,400

Journal

• Dr Wages control ........................................49,400
  • Cr Deductions payable ..................................10,000
  • Cr Net wages payable ...................................39,400

(b) Record employer on-costs

Employer on-costs: $7,410

Journal

• Dr Employer on-costs control .............................7,410
  • Cr Employer on-costs payable ............................7,410

(c) Allocate wages to WIP, overhead and abnormal cost

Journal

• Dr WIP (direct productive wages) .........................39,240
• Dr Production overhead (indirect/training/normal idle) ....9,800
• Dr Abnormal cost (abnormal idle time) .....................360
  • Cr Wages control ........................................49,400

(d) Allocate employer on-costs to WIP, overhead and abnormal cost

Journal

• Dr WIP (on-costs on direct wages) .........................5,886
• Dr Production overhead (on-costs on overhead wages) ........1,470
• Dr Abnormal cost (on-costs on abnormal wages) ..............54
  • Cr Employer on-costs control .............................7,410

(e) Pay net wages (cash payment)

Journal

• Dr Net wages payable ......................................39,400
  • Cr Bank ..................................................39,400

(Separate payment entries would be made when deductions and employer on-costs are remitted to the relevant authorities/providers.)

7) Classification and treatment of idle and training time (summary)

• Normal idle time (carpenters, 50 hours)
  • Wages $1,000 and on-costs $150 →production overhead(absorbed)
• Factory training time (carpenters, 40 hours)
  • Wages $800 and on-costs $120 →production overhead(absorbed)
• Abnormal idle time (upholsterers, 20 hours)
  • Wages $360 and on-costs $54 →abnormal cost(expensed in the period)

(If training were non-production in nature, it would be treated as an administrative period cost and expensed rather than included in production overhead.)

8) Impact on financial statements

• Inventory (WIP)increases by$45,126(direct productive labour including employer on-costs).
• Profitis reduced immediately by:
  • abnormal cost of $414(360 + 54), expensed in the period, and
  • any under/over-absorption effect in overhead (depending on the overhead absorption system used).
• Liabilitiesincrease for:
  • net wages payable, deductions payable, and employer on-costs payable until paid.
• Cashdecreases when wages are paid.

Common pitfalls and misunderstandings

• Charging all factory wages to WIP.Only productive direct labour is charged to WIP; indirect labour and normal idle/training are generally overhead.
• Ignoring employer on-costs.Excluding on-costs understates labour cost and can distort job profitability and pricing.
• Including abnormal costs in inventory.Abnormal idle time is expensed in the period and should not be carried in inventory.
• Posting only net wages.Payroll accounting starts from gross wages, then recognises deductions and net pay payable.
• Mixing up time recording and time booking.Attendance evidence is not the same as job allocation information.
• Treating all overtime premiums the same way.Decide where thepremium elementgoes based on whether overtime is job-driven or due to general causes.

Summary

Labour costs affect both inventory valuation and profit, so correct classification and posting are essential. Direct production labour (plus related employer on-costs) is charged to WIP. Indirect factory labour, factory training time, and normal idle time are treated as production overhead and absorbed into product costs. Abnormal idle time is written off to profit or loss as an abnormal cost. A disciplined flow of documents—time recording, time booking, payroll summary and labour distribution—supports accurate costing, control, and reliable ledger entries.

FAQ

What is the difference between direct and indirect labour?
Direct labour can be traced to a specific job or cost unit and is charged to WIP. Indirect labour supports production but is not traceable to a single job in a practical way, so it is treated as production overhead.

How is overtime treated in costing?
Separate the basic element (normal rate) from the premium element (extra above basic). The premium may be charged to a specific job if the job caused the overtime; otherwise it is commonly treated as overhead (or abnormal if exceptional).

How is idle time treated?
Normal idle time is included in production overhead and absorbed. Abnormal idle time is expensed as an abnormal cost and is not included in inventory.

Is training time always production overhead?
No. Factory/production training is commonly treated as production overhead. Non-production training (general HR, compliance, leadership) is normally treated as an administrative period cost and expensed.

Glossary

Direct labour
Labour cost that can be identified with a specific job, product, batch, or cost unit. Charged to WIP when it relates to productive factory work.

Indirect labour
Labour cost that supports production but cannot be traced economically to a single job (e.g., supervisors, maintenance). Treated as production overhead.

Work in Progress (WIP)
An inventory account representing incomplete production, including direct materials, direct labour and absorbed production overhead.

Production overhead
Indirect factory costs (including indirect labour, normal idle time and factory training time) accumulated for later allocation/absorption to jobs or products.

Idle time
Paid time during which employees are not producing output. Normal idle time is absorbed through overhead; abnormal idle time is expensed.

Employer on-costs
Employer costs associated with payroll, such as employer payroll taxes and employer pension contributions.

Loaded labour rate
A labour rate that includes wages plus employer on-costs (and, in some organisations, other labour-related allowances) used for costing and budgeting.

Abnormal cost (abnormal idle time expense)
Costs arising from unusual disruption or inefficiency that are written off to profit or loss rather than carried in inventory.