NZ RWT vs PIE Term Deposit Net Interest Calculator
Compare after-tax returns between standard bank term deposits (RWT up to 39%) and PIE term deposits (PIR capped at 28%) with equivalent gross yield analysis.
Compare after-tax returns between standard bank term deposits (RWT up to 39%) and PIE term deposits (PIR capped at 28%) with equivalent gross yield analysis.
Compare after-tax returns between standard bank term deposits (RWT up to 39%) and PIE term deposits (PIR capped at 28%) with equivalent gross yield analysis. Calculate exact, penny-accurate projections compliant with 2026 Inland Revenue (IRD) • ACC • Reserve Bank of New Zealand (RBNZ) standards using Calconova's deterministic IEEE-754 (Decimal.js) calculation engine with instant breakdowns.
Extra interest kept in pocket
Required standard bank rate
3.96% net annual yield
3.69% net annual yield
Enter principal amount, advertised rate, and term.
Net dollars received from identical deposits.
Capped at 28% PIR vs your 33% RWT rate, leaving $137.50 extra interest in your pocket over 12 months.
\text{Gross Interest (Simple)} = P \times r \times \frac{\text{Months}}{12} \\
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\text{Standard Net Interest} = \text{Gross} \times (1 - \text{RWT}) \\
\text{PIE Net Interest} = \text{Gross} \times (1 - \text{PIR}) \\
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\text{PIE Net Advantage} = \text{Gross} \times (\text{RWT} - \text{PIR}) \\
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\text{Equivalent Gross Standard Rate} = r_{\text{nominal}} \times \frac{1 - \text{PIR}}{1 - \text{RWT}}Standard bank term deposits are taxed under Resident Withholding Tax (RWT) at the saver's marginal tax rate (typically 30%, 33%, or 39%). PIE term deposits are structured as Portfolio Investment Entities where tax is capped at the investor's Prescribed Investor Rate (PIR, max 28%). This formula computes the exact net return differential and the equivalent pre-tax rate a standard deposit would need to offer to match the PIE deposit.
All calculations, amortizations, and scenario projections displayed on this page are strictly for informational and educational purposes. Nothing herein constitutes investment, financial, tax, or legal advice. Actual Reserve Bank of New Zealand (RBNZ) interest rates, IRD PAYE brackets, ACC Earner's Levy, KiwiSaver regulations, and lender criteria may vary. Calconova explicitly disclaims all liability for any decisions taken based upon these calculations. Consult a qualified financial advisor, CPA, or official Inland Revenue documentation prior to executing financial commitments.
A PIE term deposit is a fixed-term savings product structured as a Portfolio Investment Entity (often investing into bank deposits or cash funds). It offers the same capital stability as a regular term deposit, but with a maximum tax rate of 28% rather than your standard 30%, 33%, or 39% marginal RWT rate.
Any individual earning more than $48,000 per year (facing a 30%, 33%, or 39% personal tax rate) directly benefits. For top-bracket earners at 39%, a PIE deposit saves an entire 11 percentage points in tax on their interest earnings.
If you fail to provide your IRD number or choose an RWT rate, banks are required under IRD regulations to deduct RWT at the punitive non-declaration rate of 45%.
The equivalent gross rate represents the higher interest rate a traditional (non-PIE) term deposit would have to offer to match the net cash return of the PIE product after taxes are deducted.
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