Example result based on the prefilled values.
Income Tax
NZ$17,320.00
ACC Work Levy
NZ$1,280.00
Total Tax
NZ$18,600.00
Provisional Tax (105%)
NZ$19,530.00
Effective Rate
23.30%
Net Income
NZ$61,400.00
Continue your plan
Useful next calculations
When to use this calculator
- Before accepting a pay change, bonus, pension contribution, or salary-sacrifice option.
- When you want to compare employed, self-employed, or dividend-based income scenarios.
- When you need a simple take-home estimate before running payroll or filing returns.
- When you are approaching the £100,000 income level and want to understand the personal allowance taper effect.
- When you are planning a salary sacrifice arrangement and need to see the net pay impact before agreeing terms.
A realistic New Zealand planning example
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
Annual Net Profit (NZ$)
80000
Additional Business Expenses (NZ$)
0
Voluntary KiwiSaver Contribution (NZ$)
NZ$250 per month
Provisional Tax Method
Standard (105% of prior year)
After entering these figures, review income tax, acc work levy and total tax together rather than in isolation — each metric tells a different part of the story. Then rerun the tool with one input adjusted to see which variable has the biggest effect on all three outputs before you settle on a plan.
How to read your results
Income Tax
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result or a recommendation to make a tax decision.
ACC Work Levy
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Total Tax
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result or a recommendation to make a tax decision.
Provisional Tax (105%)
Review this figure alongside gross income and the local tax rules that apply to you. It is a planning estimate, not a filing result or a recommendation to make a tax decision.
Effective Rate
The effective rate lets you compare options on a true like-for-like basis rather than being misled by different compounding periods or fee structures. Use it to cut through headline marketing rates when shortlisting providers or products.
Net Income
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Method & assumptionsAuthoritative sources
New Zealand sole traders and contractors are taxed on their net business profit at the same progressive income tax rates that apply to employees, but without an employer to withhold PAYE, the responsibility for calculating and paying tax falls entirely on the individual. For the 2024/25 tax year the rates are: 10.5% on the first $14,000, 17.5% from $14,001 to $48,000, 30% from $48,001 to $70,000, 33% from $70,001 to $180,000, and 39% on income above $180,000. This calculator deducts any additional allowable business expenses you enter from your gross profit to arrive at taxable income before applying those bands, giving you a realistic income tax figure. The ACC Work Levy at 1.6% of liable earnings (capped at $139,384 for 2024/25) is added on top, as ACC invoices self-employed workers directly each year based on their tax return income.
Provisional tax is the mechanism IRD uses to collect income tax from self-employed people during the year rather than as a single end-of-year bill. Under the standard uplift method, your provisional tax obligation equals 105% of the previous year’s residual income tax, split across three instalments (28 August, 15 January, and 7 May for a 31 March balance date). This calculator displays that 105% figure as a forward-planning benchmark so you know roughly how much to set aside. If your income has changed significantly from the prior year, the estimation method allows you to base provisional payments on your current-year forecast instead, reducing the risk of overpaying. For detailed guidance on provisional tax, allowable deductions, and GST registration thresholds, visit ird.govt.nz/income-tax/provisional-tax.
Common mistakes
- !Using an assumption that is not supported by a current local quote, bill, statement or official source.
- !Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- !Mixing monthly and annual inputs without converting them consistently.
- !Forgetting location-specific taxes, fees, eligibility rules or payroll deductions where they apply.
- !Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
- Use the result to prepare better questions for a lender, provider, adviser or employer rather than treating it as a final answer.
Frequently asked
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