South Africa Mortgage Calculator
Your loan
Pre-filled estimate: central-bank rate 7,25% plus a typical lender margin. Replace it with your lender's offer.
- Principal & interestR 13 706
Upfront costs
- Down paymentR 150 000
- Transfer tax%R 45 000
- Legal fees%R 22 500
- Cash needed at purchaseR 217 500
What if interest rates change?
Your payment today is just the start. See how it could move if rates go up or down during your loan.
Range: 10,21% to 11,29% · The rate resets once a year.
Likely range of your monthly payment
- Most likely
- 80% of outcomes
- Middle 50% of outcomes
- If today's rate holds
In 8 out of 10 simulated futures, you pay between R 1 891 995 and R 1 986 097 in total interest (today's rate: R 1 939 342).
| Scenario | Avg. monthly | Highest monthly | Total interest | vs. today |
|---|---|---|---|---|
| Rate stays at 10,75% | R 13 706 | R 13 706 | R 1 939 342 | — |
| Drops to 10,21% at first reset | R 13 256 | R 13 706 | R 1 831 508 | ▼ −R 107 834 |
| Rises to 11,29% at first reset | R 14 161 | R 14 185 | R 2 048 707 | ▲ +R 109 365 |
| Climbs steadily to 11,29% | R 13 871 | R 13 984 | R 1 979 029 | ▲ +R 39 687 |
| Falls steadily to 10,21% | R 13 542 | R 13 706 | R 1 900 034 | ▼ −R 39 308 |
| Spikes to 11,29% for 3 years | R 13 815 | R 14 185 | R 1 965 665 | ▲ +R 26 323 |
Based on 600 simulated rate paths that drift randomly within your range and tend back toward today's rate. This is an illustration, not a forecast.
Loan balance over time
- Remaining balance
- Interest paid (cumulative)
- Principal paid (cumulative)
Interest rates in South Africa
Monthly averages. Sources: Bank for International Settlements
Shows the central-bank policy rate. Mortgage rates are usually higher.
Buying a home in South Africa: rules and costs
- Home loans (bonds) are almost always variable and priced relative to the prime lending rate.
- Transfer duty is progressive, with no duty on lower-priced homes; bond registration adds attorney and deeds-office fees.
Sources: South African Revenue Service — Transfer Duty · Rules last reviewed 2026-10.
Frequently asked questions
How is the monthly mortgage payment calculated?
For an equal-payment loan, the payment is P × i × (1 + i)^n ÷ ((1 + i)^n − 1), where P is the loan amount, i the monthly interest rate and n the number of months. Taxes, insurance and fees are added on top.
What is the current average mortgage rate in South Africa?
South Africa does not publish an official average mortgage rate that we can track. Ask several lenders for quotes and enter the rate in the calculator.
How much does a 1-point rate rise change my payment?
On a R 1 350 000 loan over 20 years, going from 10,75% to 11,75% raises the monthly payment from R 13 706 to R 14 630 — about R 924 more each month.
What upfront costs should I budget for in South Africa?
On a R 1 500 000 purchase, expect about R 67 500 in taxes and fees on top of your down payment. The breakdown is shown in the calculator above.
Can this calculator predict future interest rates?
No. The scenario tool shows a range of possible outcomes based on the band you choose. Nobody can predict rates reliably — use it to check whether you could still afford the loan if rates rise.