Second Income Budget Calculator NZ
When two people bring income into one household, it's tempting to add the gross figures together and assume tax works the same way it does for a single income. It doesn't. In New Zealand each person is taxed separately on their own earnings using the same tax brackets, so a couple's real spending power is the sum of two separate net pays, not one household figure taxed as a whole. This calculator works out that true combined take-home. You enter the first income and the second income, both as annual gross figures, and it applies the 2026/2027 tax brackets and the ACC earner's levy to each one individually before adding them together. The results show the first earner's net pay, the second earner's net pay, the combined household take-home per year, and the same figure broken down per week, which is the number most households actually budget against. It's a quick way to check what a second job, a return to work, or a partner's pay rise genuinely adds to the household once tax is accounted for properly, rather than guessing from the gross numbers alone. The figures exclude KiwiSaver contributions and student loan repayments, so if either applies to you, your actual take-home will be a little lower. Treat the results as an indicative estimate for budgeting purposes, not tax advice.
Each income is taxed on its own using the 2026/2027 brackets and the ACC levy, which is how household tax actually works. Excludes KiwiSaver and student loan. Estimate only, not tax advice.
How it works
The calculator taxes each income separately, because in New Zealand incomes are not added together for tax; each person uses the same brackets on their own earnings. It works out each net after tax and the ACC levy, adds them for the combined household take-home, and shows it per week and per year. This is the real figure to build your household budget on, rather than the gross combined income.
Worked example
A $75,000 first income nets about $59,200 and a $45,000 second income nets about $37,600, for a combined household take-home of roughly $96,800 a year, or about $1,860 a week. That weekly figure is what the household actually has to cover the mortgage, bills and everything else.
Related calculators
- Budget Calculator: plan your spending.
- PAYE Calculator: tax on one income.
- Return to Work Worth It Calculator: is the second income worth it.
- Borrowing Capacity Calculator: what you can borrow.