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NZ Bonus and Lump Sum Tax Calculator
Receiving a bonus or lump sum payment is exciting, but it's important to understand how much tax and other deductions will apply before you see the money in your bank account. In New Zealand, one-off payments like bonuses are often taxed using provisional withholding rates. This calculator helps you estimate the net amount you'll receive after PAYE tax, the ACC levy, KiwiSaver contributions, and student loan repayments.
How Bonus Tax Works in New Zealand
For tax purposes, a bonus or lump sum is often classified as an "extra pay." The Inland Revenue Department (IRD) requires employers to withhold tax from extra pays at your marginal tax rate, based on your estimated annual income. This is your annual salary plus the gross bonus amount. The purpose is to prevent you from underpaying tax during the year and facing a large bill at tax time.
If the payment is made as part of your regular pay cycle (e.g., a sales commission paid monthly with your salary), it is simply added to your income for that period and taxed at your standard PAYE marginal rates. The key distinction for withholding is whether the payment is processed separately as a one-off.
What Deductions Are Applied?
- PAYE Tax: The main income tax. For extra pays, the withholding rate is your marginal tax rate based on your total estimated annual income.
- ACC Earners' Levy: A compulsory levy that funds New Zealand's accident compensation scheme. It is deducted from all salary and wage income at a fixed rate (1.6% for 2026).
- KiwiSaver Employee Contribution: Your chosen contribution percentage (e.g., 3%, 6%) is deducted from your gross pay.
- KiwiSaver Employer Contribution: Your employer must contribute at least 3% of your gross salary (including the bonus) to your KiwiSaver account. This is an additional cost to them, not a deduction from your pay.
- Student Loan Repayments: If you have a student loan, 12% of your gross income over the repayment threshold for that pay period is deducted. For a one-off bonus, if you select the relevant pay period (e.g., weekly), only the amount above the weekly threshold ($504) is subject to the 12% deduction.
Example Calculation
Let's say Sam has an annual salary of $65,000 and receives a $5,000 bonus as an extra pay. Sam contributes 3% to KiwiSaver, has no student loan, and the bonus is processed as a monthly payment.
- Estimated Annual Income: $65,000 + $5,000 = $70,000.
- Marginal Tax Rate (for income $70,000): 30%.
- PAYE Tax Withheld: 30% of $5,000 = $1,500.
- ACC Levy (1.6%): 1.6% of $5,000 = $80.
- KiwiSaver Employee Deduction (3%): 3% of $5,000 = $150.
- Total Deductions: $1,500 + $80 + $150 = $1,730.
- Net Take-Home Bonus: $5,000 - $1,730 = $3,270.
- Employer KiwiSaver Contribution (3%): $150 (added to Sam's KiwiSaver by the employer).
Sam's provisional tax withholding is based on the 30% marginal rate. Any overpayment will be refunded when they file their annual tax return.
Frequent Scenarios
End-of-Year Bonus: The most common use case. Ensure you know if it's being processed as an extra pay.
Leaving a Job (Final Pay): Any outstanding holiday pay is subject to the same deductions. Redundancy payments may have specific tax treatments and are not covered by this calculator.
Commission Payments: If paid regularly with salary, they are taxed at the standard PAYE rate. If paid as a one-off lump sum, the extra pay rules apply.
Next Steps: Documenting the Payment
If your bonus or lump sum is part of a formal change to your employment terms, it should be documented. An Employment Agreement Amendment is the appropriate document to record changes to your compensation, such as a new bonus structure or a one-off payment agreement. Having this in writing protects both you and your employer and clarifies the terms of the payment.