Bond Calculator

Monthly repayment, total interest and the full amortisation schedule, using the standard SA reducing-balance formula.

The home

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Your bond

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Prime is 10.75% (stored SARB figure, 25 Sept 2026) - add your bank's margin, e.g. 11.75 for prime + 1. See the rates members actually got at each bank
Term20 years
5 years30 years
See what you'd pay each month
Enter the price, deposit, rate and term, then press Calculate.
  • Your monthly bond instalment
  • The loan, deposit and total interest
  • The amortisation schedule, month by month
About these figures

Worked out from the figures you enter and the published rates and tables shown; results marked as estimates depend on assumptions. General information, not financial, credit, tax or legal advice - Property HQ is not an authorised financial services provider or a registered credit provider, and banks do their own affordability assessment under the National Credit Act. Confirm the figures for your own case with your bank, conveyancer or a registered tax practitioner.

Where the figures come from

Tax, transfer duty and CGT tables from SARS; prime, repo and CPI from the South African Reserve Bank; minimum living costs from the National Credit Act regulations; exchange rates from the European Central Bank (via Frankfurter).

Frequently asked questions

4 quick answers - tap a question to open it
How is a bond repayment worked out?

South African banks use a reducing-balance formula: each month's interest is charged on what you still owe, and the rest of your repayment pays down the loan. Early on most of the repayment is interest; towards the end most of it is capital.

What interest rate should I use?

The calculator starts at today's prime rate, published by the South African Reserve Bank. Your bank may offer you prime, or a margin above or below it depending on your credit record, deposit and income - type the rate from your offer to see your real repayment.

Are there costs on top of the repayment?

Yes. Banks add a monthly service fee (capped by the National Credit Act) and usually an initiation fee that is added to the loan. Owning the home also costs rates and, in a complex or estate, levies. The once-off costs - transfer duty, attorney and Deeds Office fees - are in the cost of buying calculator.

Does paying extra into my bond help?

Every extra rand goes straight to the capital, so you pay less interest and finish sooner. The pay-off-faster calculator shows how much time and interest a monthly extra saves.