NZ Resident Withholding Tax Calculator
Calculate New Zealand resident withholding tax on interest income and estimate net interest after RWT.
Regional Rule Context
New Zealand Rates and Rules
Estimates RWT on interest using individual rates of 10.5%, 17.5%, 30%, 33%, or 39%. If no IRD number is provided, the non-declaration rate is 45%.
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Result
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For interest payments, individuals can choose an RWT rate based on their income. If no rate is chosen, the default rate is generally 33%; if no IRD number is provided, the non-declaration rate is 45%.
Disclaimer: This calculator uses publicly available rules effective as of Oct 31, 2025 (version 1.0). Results are for informational purposes only. Always verify with official sources or a qualified professional. Last reviewed: Apr 18, 2026.
Formula
Banks and other payers deduct RWT from interest before paying you. Individuals can choose an RWT rate based on income; if no rate is chosen, 33% commonly applies, and if no IRD number is provided the non-declaration rate is 45%.
New Zealand FAQs
What is resident withholding tax?
RWT is tax deducted by banks and other payers from interest or dividends before paying you.
What is the default RWT rate for interest?
IRD says if you do not choose a rate, the default rate for interest is 33%.
What if I do not give my IRD number?
Interest payments are taxed at the non-declaration rate. From 1 April 2020, that rate is 45%.
Is RWT final tax?
No. RWT is credited against your final income tax assessment at the end of the tax year.
Is it possible to embed the NZ Resident Withholding Tax Calculator on another website?
Yes, embedding the NZ Resident Withholding Tax Calculator is free. Hit the "Embed" button on this page, adjust the width, height, and theme, then grab the iframe code. It works on WordPress, Wix, Squarespace, Shopify, and plain HTML pages. No registration needed. Full instructions at calculory.com/services/embed-calculators.
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