Interest Tax Calculator NZ 2026–27
Calculate RWT and net interest using a user-confirmed resident withholding rate.
Source check 10 October 2026 · General information, not tax advice
Calculate your result
Tax year 2026–27 · New Zealand dollars · results update automatically
Results update automatically
Interest Tax Calculator
- Gross interest
- $5,000.00
- RWT rate
- 33%
- RWT withheld
- $1,650.00
- Net interest
- $3,350.00
- The selected RWT rate is user-confirmed; final income tax may reconcile differently.
How this calculator works
Calculate RWT and net interest using a user-confirmed resident withholding rate.
Formula
RWT = gross interest × selected withholding rate.
Worked example
Final income tax can differ from tax withheld.
Scope and edge cases
Eligibility, tax codes, certificates, multiple income sources and annual reconciliation can change the final outcome. Missing components are disclosed instead of silently becoming zero.
Frequently asked questions
Is this interest tax calculator exact?
The result card says whether the calculation is exact for its supported scope, indicative, missing inputs or unsupported. It never promotes an incomplete rule set as exact.
Does Taxliva store my salary?
No account is required and the interactive calculation runs in your browser.
Which tax year is used?
It uses the New Zealand tax year from 1 April 2026 to 31 March 2027.
Official sources
- Using the right resident withholding tax rate — Inland Revenue
Rule review
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