Bond repayment calculator
Work out your monthly bond repayment in seconds. Adjust the purchase price, deposit, term and interest rate to see the total cost of the home loan — and why even a small rate difference matters over 20 or 30 years.
What would your bond repayment be?
These numbers are illustrative estimates, not an offer. Your actual rate and repayment depend on your credit profile, deposit and each bank's assessment.
Last updated: 2026-09-12. Prime is shown as 10.5%. Your actual rate depends on your credit profile, deposit and the bank’s assessment.
What a better rate saves you
Yearly amortisation
How much of your repayment goes to interest versus principal each year. Early years are mostly interest; later years mostly principal.
| Year | Interest | Principal | Balance |
|---|---|---|---|
| 1 | R 156 399 | R 23 309 | R 1 476 691 |
| 2 | R 153 831 | R 25 878 | R 1 450 813 |
| 3 | R 150 979 | R 28 729 | R 1 422 084 |
| 4 | R 147 813 | R 31 896 | R 1 390 188 |
| 5 | R 144 298 | R 35 411 | R 1 354 778 |
| 6 | R 140 395 | R 39 313 | R 1 315 465 |
| 7 | R 136 063 | R 43 645 | R 1 271 819 |
| 8 | R 131 253 | R 48 455 | R 1 223 364 |
| 9 | R 125 913 | R 53 795 | R 1 169 569 |
| 10 | R 119 985 | R 59 724 | R 1 109 845 |
| 11 | R 113 403 | R 66 305 | R 1 043 540 |
| 12 | R 106 096 | R 73 612 | R 969 928 |
| 13 | R 97 984 | R 81 725 | R 888 203 |
| 14 | R 88 977 | R 90 731 | R 797 472 |
| 15 | R 78 978 | R 100 730 | R 696 742 |
| 16 | R 67 878 | R 111 831 | R 584 911 |
| 17 | R 55 553 | R 124 155 | R 460 756 |
| 18 | R 41 871 | R 137 837 | R 322 919 |
| 19 | R 26 681 | R 153 027 | R 169 891 |
| 20 | R 9 817 | R 170 021 | R 0 |
How the bond repayment is calculated
We use the standard reducing-balance (annuity) formula that South African banks use for home loans. Each month you pay interest on the outstanding balance, then the rest of the instalment reduces the principal. The monthly amount stays the same, but the interest portion shrinks over time while the principal portion grows.
The calculator starts at the current prime lending rate of 10.5%, but you can move the rate up or down to see how sensitive your repayment is. That sensitivity is the whole argument for applying to more than one bank: when banks compete, the rate you are offered can be materially better than the first quote.
Assumptions: monthly repayments in arrears; the loan amount is purchase price minus deposit; no bond-registration, transfer, attorney, insurance or other costs are included. The rate is an annual nominal rate compounded monthly. All rand values are rounded to the nearest rand for display only — calculations keep full precision.
Last updated: 2026-09-12.
Why compare bond repayment quotes?
South African home loans are priced relative to prime. The rate you are offered depends on your credit record, affordability, loan-to-value and how competitive the bank needs to be to win your business. A bond originator submits one application to every major bank, so you see side-by-side offers instead of negotiating with one lender at a time.
A lower rate does two things: it reduces your monthly repayment today, and it dramatically reduces the total interest you pay over the term. Use the calculator above to see the difference between prime, prime minus 0.25% and prime minus 0.50% on your loan size.
bond.co.za is not a bank. We do not publish guaranteed rates, guaranteed approvals or guaranteed savings. We show estimates with stated assumptions so you can compare with confidence.
Related tools
- Wondering what a rate hike would do to your repayment? See the rand cost of a 1% rate increase.
- Already have a bond and want to pay it off faster? See what an extra payment saves you.
- Already have a bond and wondering if a better rate is worth the switching costs? Run your refinance break-even.
- Not sure what price range to shop in? Use our home loan affordability calculator.
- Lower your rate? Here’s how negotiation works: Can I negotiate my home loan interest rate?.
- Getting help from family with your deposit? Read about using a gifted deposit to buy a house.
- Ready to see what a bank would actually offer? Start your free bond pre-approval.
Get your affordability estimate in 3 minutes
No contact details needed to see the number. Apply to every major South African bank with one form.