Resident Withholding Tax (RWT) Explained for NZ Investors

When you earn interest from a bank account or dividends from New Zealand shares, tax is deducted before you receive the payment. This is called Resident Withholding Tax (RWT) — and choosing the right rate is important to avoid a tax bill or overpayment at year-end.

What Is RWT?

RWT is a withholding tax deducted at source by banks, financial institutions, and companies paying interest or dividends to New Zealand tax residents. It’s similar to PAYE for investment income — the payer deducts tax and sends it to IRD on your behalf.

RWT Rates on Interest

You can choose an RWT rate that matches your expected marginal tax rate:

RWT rate	Suited for income of
10.5%	Up to $15,600
17.5%	$15,601 – $53,500
30%	$53,501 – $78,100
33%	$78,101 – $180,000
39%	Over $180,000

If you don’t provide your IRD number to the payer, a default rate of 33% (or 45% for some situations) applies — so always provide your IRD number.

RWT on Dividends

Dividends from New Zealand companies are subject to RWT at 33%. However, most NZ company dividends carry imputation credits (franking credits), which represent tax already paid by the company. These credits reduce or eliminate the actual RWT deducted.

For a fully imputed dividend, the effective RWT may be zero because the company has already paid tax on the profits.

Choosing the Right RWT Rate

Your RWT rate should match your marginal tax rate. Here’s why it matters:

• Rate too low: You’ll owe tax at the end of the year when your income is assessed
• Rate too high: You’ll get a refund, but your money has been tied up unnecessarily

You can update your RWT rate by contacting your bank or investment provider and providing your IRD number along with your chosen rate.

RWT and Tax Returns

If RWT Matches Your Tax Rate

For most salary and wage earners, IRD issues an automatic income tax assessment that includes your interest and dividend income. If your RWT rate was correct, there’s nothing further to do.

If You Need to File

You must file an IR3 tax return if you have:

• Income not covered by PAYE or RWT
• Used an incorrect RWT rate
• Overseas investment income
• Self-employment income alongside interest/dividends

RWT Exemption Certificates

Some entities (such as companies, trusts, and Maori authorities) can apply for an RWT exemption certificate. This means interest and dividends are paid to them gross, without RWT deducted. The entity then accounts for the tax in their own return.

Individuals generally cannot get an RWT exemption — the system is designed so tax is withheld at source for individual investors.

Interest Earned by Joint Account Holders

For joint bank accounts, each holder should nominate their own RWT rate. If rates differ, the bank typically applies the higher rate to the full interest amount. You’ll sort out the correct split when IRD processes your end-of-year assessment.

Sources

• Resident withholding tax — IRD
• RWT rates — IRD