Calculating Leave Pay in New Zealand: OWP vs AWE Explained

If you get leave pay calculations wrong in New Zealand, you are not alone — it is the single most common Holidays Act compliance failure across the country. Major employers including government agencies, banks, and large retailers have collectively repaid hundreds of millions of dollars to employees because their payroll systems miscalculated leave pay. The root cause is almost always a failure to correctly apply the “greater of” rule: Ordinary Weekly Pay (OWP) versus Average Weekly Earnings (AWE).

This guide breaks down exactly how each calculation works, walks you through real-world examples, and shows you where the traps are. For broader context on how leave entitlements work, see our Holidays Act employer guide.

The “Greater Of” Rule: Why It Exists

Under the Holidays Act 2003, whenever an employee takes annual leave, bereavement leave, or alternative holidays, you must pay them at the greater of:

• Ordinary Weekly Pay (OWP) — what the employee would earn in a normal week at the time the leave is taken
• Average Weekly Earnings (AWE) — the employee’s gross earnings over the previous 12 months, divided by 52

This rule protects employees from being disadvantaged when they take leave. If their earnings have varied — because of overtime, commissions, bonuses, or a recent pay rise — the higher figure ensures they are not penalised for taking their entitlements.

Getting this calculation right is not optional. The Employment Relations Authority (ERA) has consistently penalised employers who apply only one method or who calculate OWP or AWE incorrectly. If you want a deeper understanding of the broader leave framework, our guide to annual leave in New Zealand covers entitlements, accrual, and entitlement dates in detail.

Ordinary Weekly Pay (OWP) Explained

Ordinary Weekly Pay is the amount an employee would earn in a normal or typical work week. The method for determining OWP depends on how the employee’s pay is structured.

Fixed Hours and Fixed Rate

For employees on a set schedule with a fixed hourly rate or salary, OWP is straightforward. If an employee works 40 hours per week at $30 per hour, their OWP is $1,200 per week. If they are on a salary of $62,400 per year, their OWP is $1,200 per week ($62,400 ÷ 52).

This is the simplest scenario and the one where errors are least likely — but you still need to verify the calculation rather than assume your payroll system gets it right.

Variable or Irregular Hours

For employees whose hours vary from week to week — casual workers, part-timers on rotating rosters, or employees who regularly pick up additional shifts — determining OWP requires more care. The Holidays Act provides two methods:

1. Look at the last 4 weeks of earnings. If the employee has a regular pattern that emerges from the last 4 weeks, use that as the basis for OWP.
2. Refer to the employment agreement. If the agreement specifies guaranteed hours, use those hours at the applicable rate.

If neither method produces a reliable figure — for example, if the employee worked significantly more or fewer hours in the last 4 weeks than is typical — you may need to calculate an average over a longer period that fairly represents a normal week.

The key principle is that OWP should reflect what the employee would normally earn, not what they happened to earn in an unusual period.

Average Weekly Earnings (AWE) Explained

AWE is a straightforward calculation: total gross earnings over the 12 months immediately before the leave is taken, divided by 52. The critical thing to understand is what counts as gross earnings.

What to Include in Gross Earnings

Gross earnings for AWE purposes includes virtually everything you pay the employee:

• Salary or wages
• Overtime payments
• Commissions
• Bonuses and performance payments
• Shift allowances and penalty rates
• Any other payments for work performed

Essentially, if it appears on the employee’s payslip as earnings, it counts. The only common exclusions are reimbursements for expenses and payments that are not related to work performance (such as a voluntary ex-gratia payment).

The AWE Calculation

The formula is simple:

AWE = Total gross earnings over the last 52 weeks ÷ 52

If an employee earned $72,000 in gross earnings over the last 52 weeks, their AWE is $1,384.62 per week. If they earned $55,000, their AWE is $1,057.69 per week.

The trap here is using the wrong period. The 52 weeks must be the 52 weeks immediately before the leave starts, not a financial year or a calendar year. If an employee takes leave in March 2026, you use the 52 weeks ending just before that leave begins.

Worked Examples

Example 1: Fixed Hours, Fixed Rate

Employee: Works 40 hours/week at $30/hour OWP: 40 × $30 = $1,200/week AWE: $62,400 (annual salary) ÷ 52 = $1,200/week Leave pay: $1,200/week (both figures are the same)

In this scenario, both methods produce the same result. The employee earns a consistent amount, so their ordinary pay and their average earnings are identical. This is the most common situation for salaried employees on fixed hours.

Example 2: Variable Hours with Commissions

Employee: Sales representative with a base of $1,100/week (per contract) who earned $72,000 in gross earnings over the last year OWP: $1,100/week (from employment agreement) AWE: $72,000 ÷ 52 = $1,384.62/week Leave pay: $1,384.62/week (AWE is greater)

This is where the “greater of” rule really matters. The employee’s contract says $1,100/week, but their actual earnings — boosted by commissions — averaged significantly more. If you paid only the OWP of $1,100, the employee would be underpaid by $284.62 per week of leave. Over 4 weeks of annual leave, that is $1,138.48 in underpayment — and that kind of error compounds across your entire workforce over years.

Example 3: Recent Pay Rise

Employee: Was earning $1,000/week for 26 weeks, then received a pay increase to $1,300/week for the most recent 26 weeks OWP: $1,300/week (current ordinary pay) AWE: ($52,000 + $67,600) ÷ 52 = $119,600 ÷ 52 = $1,150/week Leave pay: $1,300/week (OWP is greater)

This example shows the flip side. When an employee receives a pay rise, their OWP immediately reflects the new rate, but their AWE is dragged down by the lower earnings from earlier in the year. The OWP figure is higher, so that is what you pay. This protects the employee from being short-changed because their AWE has not yet caught up with their new rate.

Why Getting This Wrong Is So Common

The Holidays Act compliance crisis in New Zealand is not a small problem. It has affected organisations of every size and sector, from small businesses to government departments, banks, and major retailers. The most common errors include:

• Applying only one method — typically using salary or base pay without checking AWE
• Miscalculating OWP for variable-hours employees — using an arbitrary figure instead of the proper 4-week average or contract rate
• Excluding components from AWE — leaving out overtime, commissions, or allowances that should be included
• Using the wrong 52-week period — calculating AWE over a financial year instead of the 52 weeks before the leave date
• Not recalculating for each leave period — assuming the same figure applies year-round when earnings change

Each of these errors can lead to systemic underpayment that goes undetected for years. When it is eventually discovered — often during a payroll audit or when an employee raises a personal grievance — the remediation costs can be substantial, including back-pay with interest and potential penalties.

Part-Time and Casual Workers: Special Considerations

Part-time workers follow the same “greater of” rule, but calculating OWP can be more challenging. A part-time employee working 20 hours per week on a fixed rate has a straightforward OWP. But a casual worker whose hours vary significantly from week to week presents a genuine difficulty.

For casual workers, you need to establish what constitutes an “ordinary” week. If the last 4 weeks show a relatively consistent pattern, use that. If not, you may need to look at a longer period or refer to any guaranteed minimum hours in the employment agreement.

The 8% Pay-as-You-Go Option

For genuinely casual or intermittent workers — those with no regular pattern of work and no expectation of ongoing employment — the Holidays Act allows a pay-as-you-go arrangement. Instead of accruing and tracking annual leave, the employer adds an extra 8% to the employee’s gross pay as a separate identifiable amount on each payslip.

This arrangement must be agreed to in writing and is only permitted where:

• The employee works so irregularly or for such a limited time that it is impractical to provide 4 weeks of annual leave
• The employment agreement specifically provides for it

The 8% must be clearly identified on the payslip — it cannot be bundled into the hourly rate without identification.

Important upcoming change: The Employment Leave Bill, which will replace the Holidays Act, proposes increasing this percentage to 12.5% as part of the shift to a Leave Cash Payment (LCP) framework. If you use pay-as-you-go arrangements, you should track these changes closely. Our coverage of the Employment Leave Bill 2026 explains what is changing and when.

A Practical Approach to Compliance

Here is a straightforward framework for ensuring your leave pay calculations are correct:

1. For every leave request, calculate both OWP and AWE. Do not skip one because you think the other will be higher.
2. Use the correct 52-week period for AWE — the 52 weeks immediately before the leave starts.
3. Include all earnings in AWE — salary, overtime, commissions, bonuses, allowances. If it is payment for work, it counts.
4. Pay the greater of the two figures. Not the average. Not the lower one. The greater.
5. Document your calculations. If you are ever audited or face an ERA claim, being able to show your working makes a significant difference.
6. Review your payroll system. If you use payroll software, verify that it is correctly applying the “greater of” rule rather than defaulting to a single method.

Frequently Asked Questions

Do I need to calculate both OWP and AWE for every single leave request?

Yes. Every time an employee takes annual leave, bereavement leave, or an alternative holiday, you must calculate both figures and pay the greater one. There is no exemption based on employment type or pay structure.

What if the employee has been employed for less than 12 months?

If the employee has not yet completed 12 months of employment, you calculate AWE using the period from their start date to the date leave begins, then divide by the number of weeks in that period.

Does AWE include KiwiSaver employer contributions?

No. AWE is based on the employee’s gross earnings — the payments made to the employee for work. KiwiSaver employer contributions are not part of the employee’s gross earnings.

What happens if I have been underpaying leave?

You owe the employee the difference, plus interest. The ERA can also impose penalties, particularly if the underpayment was systemic. The safest approach is to conduct a voluntary review and remediate proactively — it is almost always better than waiting for a complaint.

Getting Leave Pay Right Matters

The “greater of” rule exists to ensure employees are not financially worse off for taking their leave entitlements. It is not a technicality — it is a core protection under New Zealand employment law. Every employer, regardless of size, needs to understand and apply it correctly.

If you are managing leave manually or relying on spreadsheets, these calculations are time-consuming and error-prone. Leave management software can automate the OWP and AWE calculations for each leave request, ensuring you always pay the correct amount. The key is choosing a tool that is configured for New Zealand’s specific rules rather than a generic system that may apply overseas logic to your payroll.