Estimated vs actual labour cost in construction

Estimated labour cost is what you expect the work to cost. Actual labour cost is what payroll and related on-costs show after the work happens. The gap tells you whether the job is ahead or behind.

That sounds simple. The trouble starts when the estimate includes base wages, but the actual payroll includes overtime, allowances, super and other employment costs.

What is estimated labour cost?

Estimated labour cost is the planned cost of getting the work done. It should combine expected hours with the correct labour rate.

A basic estimate is:

Estimated labour cost = planned hours × estimated burdened hourly rate

The burdened rate is more than the employee’s ordinary hourly wage. Depending on the worker and project, it may include:

• Base wages under an award, enterprise agreement or employment contract
• Expected overtime and penalty rates
• Site, travel, meal, tool and leading hand allowances
• Superannuation
• Payroll tax, where the employer is liable
• Workers compensation premiums
• Portable long service leave charges
• Paid leave and public holiday costs
• Training, inductions and expected non-productive time

If you price 100 hours using only the base rate, you have not estimated the full labour cost. You have estimated wages.

Our job costing guide covers how payroll transactions can be assigned to jobs, stages and cost codes.

What is actual labour cost?

Actual labour cost is the employment cost recorded after workers submit time and payroll is processed.

It normally starts with paid hours. You then add applicable allowances, super and employment on-costs. Some costs, such as workers compensation adjustments or payroll tax, may be posted later.

That timing matters. A job report run before payroll is finalised may look healthy simply because part of the cost has not arrived yet.

Keep committed labour separate where possible. For example, approved timesheets that have not reached payroll are committed costs. They are not estimates anymore, but they are not final payroll actuals either.

Australian payroll settings that affect the comparison

A few payroll rules can move actual cost quickly:

• The super guarantee rate is 12% as at October 2026. Super is generally calculated on ordinary time earnings, not automatically on every amount paid.
• The casual loading under the Building and Construction General On-site Award is generally 25% as at October 2026. Check the worker’s classification and any applicable EBA.
• Under that award, Monday to Friday overtime is generally 150% for the first 2 hours and 200% after that, as at October 2026. The day, time and applicable industrial instrument can change the result.
• Fair Work employment records generally need to be kept for 7 years as at October 2026. Your job costing detail should be traceable back to timesheets and payroll records.

Award wage amounts can change after annual wage reviews. Do not copy last year’s hourly rates into a new tender without checking them.

Worked comparison

Say a contractor estimates one carpenter’s work using an assumed $40 ordinary hourly rate. This is an example rate, not a prescribed award rate.

The example assumes overtime is outside ordinary time earnings. It also assumes the listed allowance is ordinary time earnings. Actual super treatment depends on what the allowance pays for.

Cost item	Estimate	Actual	Variance
Ordinary hours	80 × $40 = $3,200.00	84 × $40 = $3,360.00	$160.00
Overtime	8 × $60 = $480.00	14 × $60 = $840.00	$360.00
Allowances	$176.00	$220.00	$44.00
Super at 12% on assumed OTE	$405.12	$429.60	$24.48
Other on-costs, internal assumption of 9%	$303.84	$322.20	$18.36
Total labour cost	$4,564.96	$5,171.80	$606.84

The actual cost is $606.84 above estimate, or about 13.3%. Most of the difference came from overtime, not the ordinary hourly rate.

That is why comparing total dollars alone is not enough. Split the variance into hours, pay rates, overtime, allowances and on-costs.

How to track the variance properly

1. Use matching cost codes

The estimate and timesheet need the same job, stage and activity codes. If formwork was estimated separately from concrete placement, workers should record their time the same way.

2. Estimate productive hours

An employee may be paid for 38 ordinary hours, but not every hour becomes productive site time. Inductions, travel between sites, training, weather delays and rework can reduce productive hours.

Dividing annual employment cost by paid hours can understate the real cost per productive hour.

3. Let payroll calculate payroll rules

Site staff should record what happened: start time, finish time, breaks, location and activity. Payroll should apply the award, EBA or contract rules.

Asking supervisors to manually calculate overtime on every timesheet creates another place for errors.

4. Post costs after each pay run

Do not wait until project completion. Compare estimate, committed cost and actual cost after each pay cycle. That gives the project manager time to change the crew mix, sequencing or programme.

5. Update the forecast

Do not rewrite the original budget when actual costs rise. Keep the approved estimate as the baseline, then update the forecast cost to complete.

A practical forecast is:

Forecast final labour cost = actual cost to date + expected cost to complete

Before submitting a quote, test labour rates, expected hours and margin using the Project Payroll pricing calculator.

Common reasons actual labour cost is higher

The usual causes are straightforward:

• More hours were needed than the estimator allowed
• Overtime occurred at a higher multiplier
• The wrong classification or old award rate was used
• Casual loading or site allowances were omitted
• Super and other on-costs were added to payroll but not the estimate
• Time was posted to the wrong job or cost code
• Rework and waiting time were hidden inside productive hours
• Subcontractor labour was compared with employee wages without consistent treatment of GST and on-costs

When the variance appears, ask whether it came from rate, hours, productivity or coding. That question turns a red number into something the site team can act on.