Resident withholding tax (RWT) is a tax on interest and dividends you earn from your bank accounts and investments in New Zealand and overseas1. RWT is withheld for interests2 and investment income that takes the form of dividends3. The banker or fund manager should deduct RWT from the interest or dividend before making a payment.
1.https://www.ird.govt.nz/income-tax/withholding-taxes/resident-withholding-tax-rwt