NZ Bonus & Commission Tax Calculator 2026/27
Bonuses, commissions and other one-off payments are not taxed the same way as your regular salary in New Zealand. IRD requires employers to use the "extra emolument" method, which finds the correct marginal tax rate by looking at what the payment does to your annual income, rather than running it through normal PAYE tables. This calculator applies that method for you. You choose the type of payment (performance bonus, irregular sales commission, back-pay, ex gratia payment, payment in lieu of notice, or a productivity incentive), then enter the gross bonus amount, your regular annual salary excluding the bonus, whether you have an active student loan, and your KiwiSaver contribution rate. The results show the tax on your salary alone, the tax on salary plus bonus, the resulting income tax on the bonus, and your effective tax rate, plus the ACC earners' levy, KiwiSaver contribution and student loan repayment (where relevant) taken from the payment. It finishes with your total deductions and the net bonus you actually receive. This matters most when a bonus is large enough to push you into a higher bracket, because the calculator splits the payment correctly across both rates instead of taxing it all at one flat percentage. Figures use 2026/27 tax brackets and ACC rates and are indicative only, so check your payslip or ask your payroll provider to confirm the exact deduction.
Bonus details
Employee details
The extra emolument method
NZ's PAYE system normally calculates tax as if every pay period continues for the rest of the year. A $10,000 bonus paid on top of a regular fortnightly pay would over-tax massively if it went through normal PAYE tables. The extra emolument method fixes this by:
- Adding the bonus to the employee's expected annual income
- Calculating tax on the combined amount using progressive brackets
- Subtracting the tax on the regular salary alone
- The difference IS the tax on the bonus
When it crosses brackets
If the bonus pushes the employee from one bracket into another, the calculation correctly splits the bonus between the rates. For example, a $20,000 bonus to someone on $70,000:
- $8,100 of the bonus stays in the 30% bracket ($70k → $78,100)
- $11,900 of the bonus moves into the 33% bracket ($78,100 → $90,000)
- Total bonus tax: $8,100 × 30% + $11,900 × 33% = $2,430 + $3,927 = $6,357 (effective rate 31.8%)
Other deductions still apply
The extra emolument method only affects income tax. KiwiSaver, ACC, ESCT, and student loan deductions all apply to the bonus as if it were ordinary salary. The bonus increases your gross earnings for the period, which increases your KiwiSaver employee/employer contributions and ACC levy that period.
Special cases
- Redundancy: Redundancy and retiring payments are taxed in full as extra pay, with no general exemption (the old redundancy rebate was removed from 1 October 2010). Use the dedicated Lump Sum & Redundancy Tax Calculator.
- Back-pay over multiple years: Can be allocated to the years it would have been earned (reduces tax if employee was in lower brackets in past years).
- Director's fees paid as bonus: Treated as schedular payment, not extra emolument. Use the Schedular Payments Calculator.
- Bonuses to non-residents: Subject to NRWT (non-resident withholding tax) at different rates.
Sources
- IRD - Lump sum payments and bonuses
- Income Tax Act 2007 - Extra pay provisions
- IR340 PAYE Tables (April 2026)