Your average tax rate versus your marginal rate.
Effective (average) rate
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Marginal rate
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Total tax
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Your breakdown
Updates live as you type| Income band | Rate | Tax on the slice |
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The number on your payslip is not your tax rate
Plenty of New Zealanders believe that earning into the 33 percent band means a third of their pay vanishes to tax. It does not, and the gap between belief and reality is what this tool exists to show. Your marginal rate is the rate on your next dollar earned. Your effective rate is the total tax you pay divided by your total income, and it is always lower, because New Zealand taxes income in slices. The first $15,600 is taxed at just 10.5 percent for everyone, the next slice at 17.5 percent, and so on up the ladder. Only the income sitting in the top band you reach is taxed at that top rate.
Enter your taxable income and the calculator runs it through the full bracket structure, then reports your effective average rate, your top marginal rate, and the total income tax. It is the clearest way to see why a six-figure earner does not lose anywhere near 39 percent of their income to tax.
Stepping $90,000 through the five bands
Take an income of $90,000. The calculator fills each band in turn. The first $15,600 is taxed at 10.5 percent, the chunk from $15,600 to $53,500 at 17.5 percent, the chunk from $53,500 to $78,100 at 30 percent, and the final $11,900 from $78,100 to $90,000 at 33 percent. Add the four pieces together.
So a worker who sits in the 33 percent band actually pays an average of 21.75 percent across their whole income. The chart sets the two figures side by side.
What a pay rise really costs you
This is where knowing your marginal rate pays off. When you negotiate a raise or take on extra work, the new income is taxed at your marginal rate, not your effective rate, because it stacks on top of everything you already earn. On $90,000 your next $5,000 is taxed at 33 percent, so you keep $3,350 of it before the ACC earners' levy. Conversely, a deductible expense or a salary-sacrificed contribution saves you tax at the marginal rate too, which is why deductions are worth more to higher earners. If you are deciding whether a side gig is worth it, judge the after-tax return using the marginal rate, never the average.
The levy that sits outside this figure
One important boundary: this calculator shows income tax only. It does not include the ACC earners' levy, which is deducted from your wages alongside PAYE at 1.67 percent of earnings up to an annual cap. The levy is not income tax and it funds accident cover, so it belongs in your take-home pay maths but not in your effective income tax rate. If you want the full picture of what leaves your pay, including ACC and any KiwiSaver and student loan deductions, use a take-home pay calculator instead. A common mistake is adding the 1.67 percent levy onto the effective rate and concluding you are taxed more heavily than you are. They are separate charges with separate purposes.
Why is my effective rate higher than a friend on the same salary?
If you are on identical taxable incomes the effective income tax rate is the same, because the brackets are universal. Differences usually come from things outside this calculation: KiwiSaver contributions, student loan repayments, the ACC levy, the Independent Earner Tax Credit, or Working for Families. Those change your take-home pay without changing the underlying income tax rate this tool reports.
Does crossing into a new tax bracket ever leave me worse off?
No. Because only the income above each threshold is taxed at the higher rate, earning one dollar more never reduces your take-home pay. You always keep a majority of every extra dollar. The fear of being pushed into a higher bracket and losing money overall is a myth in New Zealand’s system, though tightly targeted credits like Working for Families can abate as income rises, which is a separate effect.