Purchased annual leave: why dollar-based accruals break payroll config

Dollar-based accruals break purchased annual leave because leave is a quantity of time, while its dollar value changes with pay rates, allowances and leave loading. Track the entitlement in hours or weeks, then calculate its value when payroll needs it.

Purchased leave has two moving parts

Purchased annual leave usually lets an employee receive extra time away from work in exchange for reduced pay or scheduled payroll deductions. The exact arrangement depends on the employer's policy, employment contract, award or enterprise agreement.

There are two separate records:

1. The employee's entitlement to take extra leave, measured in hours or weeks.
2. The funding arrangement, measured in dollars deducted or salary forgone.

Here is the trap. Some payroll systems combine those records into one dollar balance. That looks tidy until the employee's rate changes.

As at November 2026, the National Employment Standards provide 4 weeks of annual leave for most employees and 5 weeks for certain shiftworkers. The super guarantee rate is 12 per cent, and payroll records generally need to be kept for 7 years.

Purchased leave sits on top of the minimum statutory entitlement. It must not erase, replace or reduce those 4 or 5 weeks.

For more practical payroll controls, see the payroll operations hub.

A simple rate-change example

Say a full-time site employee purchases 2 extra weeks. At 38 ordinary hours a week, that is 76 hours.

Their base rate is $40 an hour when the arrangement starts. Payroll records a purchased leave value of $3,040, being 76 hours multiplied by $40.

Six months later, an award increase or contract review lifts the rate to $44 an hour. The employee still has 76 hours available. But the original $3,040 now covers only 69.09 hours at the new rate.

The dollar bank is short by $304. That does not mean the employee has lost 6.91 hours. It means the original dollar value is no longer a reliable measure of the leave entitlement.

Configuration method	What payroll stores	Result after rate rises from $40 to $44
Dollar-only accrual	$3,040	Appears to fund only 69.09 hours
Hours-only accrual	76 hours	Preserves the time entitlement, but does not show employee funding
Hours plus funding ledger	76 hours and separate deductions	Preserves the entitlement and allows funding reconciliation

The third method is usually the safer design. Hours control what can be taken. The separate dollar ledger shows deductions, salary reductions or any balance that needs review.

Why construction payroll makes the gap worse

Construction pay changes often. An apprentice may progress to the next stage. A worker may move into a higher classification. An annual wage review may change award rates from 1 July. An enterprise agreement may introduce another increase on a different date.

Leave pay can also involve more than one rate field. Depending on the applicable instrument, payroll may need to consider:

• The employee's base rate for ordinary hours.
• All-purpose allowances that form part of the relevant rate.
• Annual leave loading, where the award, agreement or contract requires it.
• Higher duties or classification changes.
• Part-time ordinary hours.

Site allowances, travel payments, overtime and expense reimbursements are not automatically included in leave pay. Each component needs to be classified under the relevant award, enterprise agreement or contract.

A dollar balance cannot reliably handle all those changes. It freezes an old assumption into the employee's record.

Configure the entitlement and funding separately

Start with a distinct leave category for purchased leave. Do not drop it into the same bucket as statutory annual leave unless the legal terms genuinely make it part of that entitlement.

The leave category should record:

• Hours purchased.
• Hours taken.
• Hours remaining.
• The agreement start and end dates.
• Whether the balance is credited upfront or progressively.
• What happens to unused hours at the end of the arrangement.
• What happens when employment ends.

Then create a separate payroll item for the funding side. Depending on the written arrangement, this might be an after-tax deduction, a prospective salary reduction or another authorised arrangement.

Do not guess the tax, super or ordinary time earnings treatment from the deduction's name. A salary reduction does not automatically mean super is calculated on the lower amount. Review the written terms and the applicable tax and super rules.

Employee deductions must also be lawful and properly authorised. The authorisation should identify the amount or calculation method and be retained with the payroll records.

Decide which rate applies when leave is taken

The written agreement should state how purchased leave is paid. Common approaches include payment at the employee's applicable rate when the leave is taken, or a defined rate under the purchase arrangement.

For statutory annual leave, the National Employment Standards use the employee's base rate of pay for ordinary hours, with any additional award or agreement obligations applied separately. Purchased leave may be contractual rather than statutory, so its terms need to be clear.

If the policy promises 2 weeks of extra paid leave, a payroll dollar cap should not quietly reduce that promise after a wage increase. The system must follow the lawful agreement, not the value originally loaded into the software.

Run a test for at least these events:

1. A pay-rate increase before leave is taken.
2. An employee changing classification.
3. A part-time employee changing ordinary hours.
4. Leave loading becoming payable.
5. Employment ending with hours and deductions still outstanding.

The compliance audit tool can help you check whether the configured rules match the employee's award, agreement and payroll records.

Watch the service and accrual rules

Payroll also needs to know whether the purchased absence is treated as paid leave or unpaid leave. Statutory annual leave generally continues to accrue during paid leave, but generally not during unpaid leave.

Do not decide this from the label used in the payroll menu. Read the purchase agreement and confirm how the absence is legally treated. Otherwise, an employee may receive the right purchased leave balance but the wrong annual leave and personal leave accruals.

For example, if payroll incorrectly marks a purchased leave week as unpaid leave, the system may stop ordinary leave accruals and affect service-based calculations. If it incorrectly marks a genuinely unpaid absence as paid service, balances may be overstated.

Termination is the final stress test

Unused statutory annual leave must be paid out when employment ends. Extra purchased leave does not automatically follow the same rule. Its treatment depends on the lawful written arrangement.

The agreement should explain whether payroll will:

• Pay unused purchased hours.
• Refund excess deductions.
• Recover an underfunded amount where legally permitted.
• Cancel unused hours with no further adjustment.

Keep statutory annual leave and purchased leave separate so the termination calculation does not pay the wrong balance or apply leave loading incorrectly.

The clean rule is simple: time belongs in the leave ledger, and money belongs in the payroll funding ledger. Reconcile the two, but do not treat them as the same thing.