Bond Calculator South Africa
Calculate your home loan repayment and see how extra payments save interest.
Free · No sign-up · Your numbers never leave your browser
Last reviewed: Source: SARB — monetary policy statements
Read the guide: The Complete Guide to Home Loan Repayments in South Africa
Stored reference Prime lending rate
10.75%(Repo + 3.50pp)
As of
Stored reference: 10.75% (repo + 3.50 percentage points), as of 2026-09-25. This default is a banking-convention estimate; use your lender's contracted rate.
Rate sources and dates · SARB monetary policyEstimates hold the entered rate constant and assume the extra payment continues every month. Prime-linked rates can change. Payments and monthly interest round to cents; the final payment settles the remaining balance.
Compare home loan repayments and extra payments
Estimate your monthly bond repayment and compare how extra payments change payoff time and interest. Choose 10, 15, 20, 25 or 30 years; the default is 20 years. Quick choices add R500, R1,000, R2,000 or R5,000 to the monthly repayment.
The comparison table includes the standard repayment and your custom extra amount. The balance chart shows the standard and selected extra-payment schedules; the table and savings sentence provide the same information in text.
Method and assumptions
The standard annuity formula uses the bond amount (property price minus deposit), the annual rate divided by 12 and the term in months. Each month, interest, payment and remaining balance round to cents. The final payment is capped at the balance plus interest, with any contractual-term rounding residual settled at maturity.
All comparisons assume the entered rate remains constant and extra payments continue every month. Banks set their prime lending rates; SARB sets the repo policy rate. A prime-linked contracted rate can change, so actual payoff dates and savings can differ.
A shorter term has higher monthly repayments and usually less total interest. A deposit reduces the borrowed capital, but lender approval and affordability depend on your circumstances. This repayment estimate excludes registration, transfer costs, lender fees, insurance, rates, levies and maintenance.
Worked examples
Illustrative scenarios prepared 13 October 2026: fixed 11.75% annual interest, no deposit, no extra payment and no fees. This is a chosen example rate, not a current prime-rate quote. Figures use the same calculator method and round for display.
| Price / loan | Term | Monthly repayment | Total interest |
|---|---|---|---|
| R 1 000 000 | 20 years | R 10 837 | R 1 600 897 |
| R 1 000 000 | 30 years | R 10 094 | R 2 633 867 |
| R 1 500 000 | 20 years | R 16 256 | R 2 401 342 |
| R 1 500 000 | 30 years | R 15 141 | R 3 950 799 |
| R 2 000 000 | 20 years | R 21 674 | R 3 201 795 |
| R 2 000 000 | 30 years | R 20 188 | R 5 267 764 |
Plan the full cost
Sources
Frequently Asked Questions
Enter your bond amount, contracted rate and term, then choose the R1,000 preset. The comparison shows payoff time, interest saved and time saved using a constant rate and continuous monthly extra payments.
A longer term usually lowers the monthly repayment but increases total interest at the same positive rate. Compare both against a payment you can sustain; approval depends on the lender.
Your contract determines whether the rate is fixed or linked to bank prime. SARB sets repo; banks set prime. This estimate holds your entered rate constant, so future changes affect the real repayment and savings.
Deposit requirements depend on the lender, property and affordability assessment. Enter the deposit you expect to pay; this calculator estimates repayments and does not determine loan approval.
Transfer duty where applicable, conveyancing and bond registration costs, lender fees, insurance, rates, levies and maintenance are excluded from this repayment estimate. Use the linked property calculators for estimates.
Related Calculators
Transfer Duty Calculator
Calculate transfer duty on South African property purchases.
Bond Registration Cost Calculator
Estimate attorney and deeds office fees to register your home loan bond.
Affordability Calculator
Check your debt-to-income ratio and how much additional credit you can afford.
Income Tax Calculator
Calculate your South African income tax, PAYE, and take-home pay.
Rent vs Buy Calculator
Compare renting vs buying over 5-30 years with full cost analysis.