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Every tax and savings calculator on Calculate.co.nz is gathered here, from everyday PAYE and GST through to the detailed tax rules that catch people out. Work out your take-home pay, add or remove 15 percent GST, check a provisional tax instalment, estimate a tax refund, or step through the full Fringe Benefit Tax and Foreign Investment Fund suites. There are tools for contractors, the self-employed, investors with overseas shares, and anyone trying to understand secondary tax codes, ACC levies or student loan deductions. Each calculator uses current IRD rates and thresholds for the 2026/27 tax year, is completely free, and needs no sign-up. Choose a tool from the list below to get started. These calculators are for education and estimates only and do not constitute tax or financial advice. For binding decisions, check with IRD or a registered tax adviser.
300 free calculators in this category
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