NZ RWT Savings Calculator 2026
Calculate Resident Withholding Tax (RWT) on your savings interest. Compare your selected RWT rate against your marginal tax rate to see if you'll owe a top-up or receive a refund at year-end. Choose the right RWT rate to minimise under/overpayment.
NZ RWT Savings Calculator 2026 — Resident Withholding Tax on Interest
Free New Zealand RWT (Resident Withholding Tax) calculator for savings interest. Estimate tax deducted at source, top-up or refund due, and net interest after tax.
Resident Withholding Tax (RWT) is deducted by banks and financial institutions from interest you earn on savings, term deposits, and bonds. You can choose your RWT rate (10.5%, 17.5%, 30%, or 33%) by telling your bank. If the RWT rate is lower than your marginal tax rate, you'll owe the difference at year-end. If it's higher, you'll get a refund. Choose 30% to avoid most top-ups unless you're in the 33% or 39% bracket.