Term Deposit Calculator NZ
Use this NZ term deposit calculator to estimate how much interest your deposit could earn before and after tax. Enter your deposit amount, term, annual interest rate, interest payment frequency, and either your RWT or PIR rate. For example, a $10,000 term deposit at 4.75% p.a. for 12 months would earn about $475 before tax if interest is paid at maturity. At a 33% RWT rate, the after-tax interest would be about $318.25, giving an estimated maturity value of $10,318.25.
Why this calculator is different
Free to use, no sign-up, no email required
Built-in RWT and PIR toggle - see your after-tax return, not just the headline rate
Supports monthly, quarterly, half-yearly, annual and at-maturity compounding
Typical NZ rates included as a starting point — always confirm the current rate with your bank
RWT vs PIR explainer
Every dollar of interest you earn on a term deposit gets taxed. The question is which rate applies.
RWT (Resident Withholding Tax) is the default. Standard term deposits deduct RWT at your marginal income tax rate — 10.5%, 17.5%, 30%, 33% or 39% — based on what you tell your bank or IRD. If you don't nominate a rate, the bank may apply the highest one by default, which means you could be overpaying.
PIR (Prescribed Investor Rate) applies to term deposits held through a PIE (Portfolio Investment Entity) structure. The top PIR rate caps out at 28%, well below the top RWT rate of 39%. If you're in the 33% or 39% tax bracket, a PIE term deposit can mean a meaningfully better after-tax return for the same rate offered.
Not every bank offers a PIE version of their term deposit, and the right choice depends on your personal tax position - this calculator gives you the numbers, not the advice. If you're unsure which applies to you, ask your bank directly or speak to a financial adviser.
Things to know before you invest
Minimum deposits vary — most banks sit between $1,000 and $10,000. Kiwibank and Co-operative Bank accept smaller amounts; Rabobank and some others set higher minimums.
Early withdrawal usually costs you — most banks apply an interest penalty or require notice if you need your money before maturity. Check the product terms before you lock in.
Your deposit is protected up to $100,000 — the Depositor Compensation Scheme covers eligible deposits per institution if a registered bank fails. Spreading larger sums across two banks gets you full coverage on both.
Rates aren't fixed across the board — smaller banks and non-bank lenders (Heartland, SBS, TSB, Rabobank) often pay 0.3%–0.6% more than the big four. Compare before you commit.
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