Term Deposit Savings Calculator

This calculator works out the maturity value of a New Zealand term deposit, showing how much interest you will earn after tax across your chosen investment term. Enter your investment term in years, your starting deposit amount and your annual interest rate, then choose whether the rate is fixed for the whole term or variable between a minimum and maximum. You can also model regular top-ups by setting a deposit amount and how often you add to it, plus any one-off additional annual deposits, and pick how often interest compounds, from daily to annual. Because term deposit interest is taxable income in New Zealand, you set your income tax rate, or switch tax off to compare, and the tool applies it automatically. The headline result is interest earned after tax, and a year by year breakdown below shows the interest rate assigned to each period, the interest and tax contribution, scheduled deposit contributions, and running cumulative totals for your deposit, interest, tax and net investment balances, plus the average rate achieved if you chose a variable rate. Use it to compare offers with different rates and compounding frequencies, or to see how regular top-ups grow your balance over a longer term. As variable rates are simulated within your chosen range, figures are indicative estimates only and will differ from your bank's actual offer.

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Updated April 2026  Current rates and legislation applied.

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