NZ Resident Withholding Tax Calculator
Work out the correct Resident Withholding Tax (RWT) rate for your bank interest and dividends. Choosing the right rate prevents end-of-year tax bills or refunds. Based on Inland Revenue 2026 rates.
RWT Breakdown
What Is Resident Withholding Tax (RWT)?
Resident Withholding Tax is tax that NZ banks and companies deduct from interest and dividend payments before paying you. The bank sends the RWT directly to Inland Revenue (IRD). RWT is not a separate tax — it's a prepayment of your income tax. If your RWT rate matches your marginal income tax rate exactly, you owe nothing extra at year-end. If your RWT rate is too low, you'll owe IRD the difference. Too high, you'll get a refund. The right RWT rate depends on your total annual taxable income (source: ird.govt.nz, RWT for individuals).
2026 RWT Rates for Interest
For NZ tax-resident individuals, the RWT rates on interest are: 10.5% if total income up to NZ$15,600, 17.5% if income NZ$15,601 to NZ$53,500, 30% if income NZ$53,501 to NZ$78,100, 33% if income NZ$78,101 to NZ$180,000, and 39% if income above NZ$180,000. Trusts default to 33%, companies to 28%. If you fail to give your bank your IRD number, the bank deducts the no-notification rate of 45% — far higher than any individual marginal rate. You can change your RWT rate at any time by contacting your bank or via myIR (source: ird.govt.nz, IR3 income tax return).
RWT on Dividends and Imputation Credits
NZ companies typically pay 28% income tax. When they distribute profits as dividends, they attach "imputation credits" representing the tax already paid. If you own NZ shares, your dividend statement shows: gross dividend, imputation credits, and RWT (top-up to your marginal rate). Example: a $700 cash dividend with $272 imputation credits and 33% RWT means $972 gross income, $272 already paid by the company, $321 your total tax (33% × $972), $49 RWT deducted = $651 cash to you. Always check the dividend statement to verify imputation credits — incorrectly claimed credits trigger IRD penalties.
How to Choose the Correct RWT Rate
The general rule: pick the RWT rate matching your marginal tax bracket. If you're in the 33% bracket, choose 33% RWT. Picking a lower rate means a tax bill at year-end; picking higher means you've over-paid and need to file IR3 to claim a refund. Most NZ banks default new accounts to 33% if you don't specify — appropriate for many earners but wrong for low-income or very high-income holders. Check your rate in your online banking under "Tax details" or call your bank. PIE (Portfolio Investment Entity) interest is taxed differently at PIR rates (10.5%, 17.5%, 28%) and capped at 28% maximum. Last updated: April 2026.
Frequently Asked Questions
What is the correct RWT rate for me in 2026?
For individuals: 10.5% if income ≤ $15,600, 17.5% if $15,601-$53,500, 30% if $53,501-$78,100, 33% if $78,101-$180,000, 39% if above $180,000. Trusts default to 33%, companies to 28%. Pick the rate matching your marginal income tax bracket (source: ird.govt.nz).
What happens if I choose the wrong RWT rate?
Too low: you'll owe IRD the difference at year-end via your IR3 tax return. Too high: you've overpaid and can claim a refund. Either way, the total tax is the same — RWT is just a prepayment mechanism. Choosing wrong creates cash-flow timing issues, not extra tax.
What is the no-notification RWT rate?
45%. If you don't give your bank your IRD number, NZ tax law requires them to deduct 45% RWT on interest. This is much higher than any individual marginal rate. Always provide your IRD number when opening accounts.
Do I have to pay RWT on every dollar of interest?
Yes — there's no minimum threshold for RWT in NZ. Banks deduct RWT on all NZ-sourced interest paid to NZ tax residents. Foreign-sourced interest is not subject to RWT but is still taxable income that must be declared in your IR3.
How is RWT on dividends different from RWT on interest?
Dividend RWT is the top-up between the company's imputation credits (28%) and your marginal rate. If you're in the 33% bracket, RWT on dividends is 5% (33% - 28%). For interest, RWT is the full marginal rate since banks don't have imputation credits.
Can I claim back excess RWT?
Yes. File an IR3 tax return after the end of the tax year (March 31). If your total RWT and PAYE deductions exceed your actual tax liability, IRD refunds the difference. Most refunds are processed within 6-8 weeks of filing.
What's the difference between RWT and PIR (PIE)?
PIE (Portfolio Investment Entity) tax applies to managed funds (KiwiSaver, multi-rate PIEs). PIR rates are 10.5%, 17.5%, or 28% (capped). PIE is final tax — no top-up at year-end. RWT applies to bank deposits and direct shares — top-up may be required at year-end if your rate is too low.