# How does home loan interest work in South Africa? - Canonical URL: https://bond.co.za/guides/how-home-loan-interest-works-south-africa - Author: Neil B - Published: 2026-10-26 - Last updated: 2026-10-26 1. [Home](https://bond.co.za/) 3. [Guides](https://bond.co.za/guides) 5. [Interest rates](https://bond.co.za/guides/rates) 7. How home loan interest works [Interest rates](https://bond.co.za/guides/rates) Interest is charged daily on your outstanding balance and billed monthly. Your rate starts at prime — 10.75% since 25 Sept 2026 — plus or minus a margin your bank sets on your profile. Early instalments are mostly interest; on a R 1 500 000 bond over 20 years you would repay about R 3 654 824 in total. By [Neil B](https://bond.co.za/expert) · Checked against published primary sources · Published 2026-10-26 · Last verified 2026-10-26 [Calculate your monthly repayment](https://bond.co.za/bond-calculator)[How prime is set →](https://bond.co.za/guides/prime-rate) Free, on screen, no signup — and you can see the interest vs capital split for your own bond before you decide anything. Charged daily, billed monthlyPrime: 10.75%First instalment: 88.2% interestWorked examples assume a constant rate The short answer ## From the SARB to your debit order: the chain that sets your rate One decision in Pretoria moves every variable bond in the country — through a chain with four links. 1. 1. ### The SARB MPC sets the repo rate The Monetary Policy Committee meets roughly every two months and sets the repo rate — currently 7.25%, after the 23 September 2026 decision raised it 25 basis points (South African Reserve Bank (SARB), effective 25 Sept 2026). 2. 2. ### Banks add a fixed spread to get prime South African banks set their prime lending rate at repo plus a fixed 3.5 percentage points, giving today’s prime of 10.75%. When repo moves, prime moves by the same amount on the same effective date. 3. 3. ### Your bank adds or subtracts a margin Your bond is quoted as prime plus or minus a margin based on your credit record, deposit and loan-to-value. Offers across the major banks typically land between prime − 1.0% and prime + 2.0% (illustrative band, 2026-10-03). 4. 4. ### Your instalment reprices automatically On a variable bond there is nothing to renegotiate — your rate and instalment change on the effective date, up or down. Fixed-rate bonds are the exception: they are locked for a set term. Where you land in that margin band is the part you can influence: approved borrowers average 0.67% below prime across ooba-registered bonds, which is evidence that comparing banks moves the number. How the margin is negotiated is covered in the [guide to negotiating your home loan interest rate](https://bond.co.za/guides/can-i-negotiate-my-home-loan-interest-rate). The mechanics ## How is home loan interest calculated in South Africa? Daily on the balance, billed monthly, on a reducing scale — three facts that explain everything else on this page. The daily charge is your balance × your annual rate ÷ 365. On a R 1 500 000 bond at 10.75%, that is R 1 500 000 × 10.75% ÷ 365 = **R 442** per day — before a cent of capital has been repaid. **Daily accrual.** Lenders do not compute interest once a month — they accrue it every day on the balance that is outstanding that day. The roughly 30 days’ worth of daily charges is what appears as the “interest” line on your monthly statement. This is also why payment dates matter: money in the bond early in the month stops accruing immediately. **Monthly billing.** Your instalment is applied once a month: it settles the accrued interest first, and whatever is left reduces the capital. If your instalment only just covers the interest, the balance barely moves — which is exactly what happens in the early years. **Reducing balance.** Interest next month is charged on a slightly smaller balance than this month, so the interest portion falls and the capital portion rises with every payment — no renegotiation, it is built into the arithmetic. The amortisation table below shows the split shifting over a full term. Worked example ## Your first instalment, split to the cent A R 1 500 000 bond over 20 years at today's prime of 10.75% — instalment R 15 228 a month. At the start, the balance is the whole loan, so the daily charge is at its maximum. On this bond the first instalment splits like this: First-month split of a R 1 500 000 bond over 20 years at 10.75%, as verified 2026-09-23. Computed from the standard reducing-balance amortisation formula. Illustration, not a quote. | Component | Month 1 | | --- | --- | | Opening balance | R1 500 000.00 | | Monthly instalment | R15 228.43 | | Interest (88.2% of the instalment) | R13 437.50 | | Capital repaid (11.8%) | R1 790.93 | | Closing balance | R1 498 209.07 | Of the R15 228.43 you pay in month one, R13 437.50 is interest and only R1 790.93 comes off what you owe. The shift is slow but steady: by month 60 interest is 80.1% of the instalment, by month 120 it is 66.0%, and by month 180 it is 42.0%. On this bond the crossover — the first month where more of your money builds equity than pays the bank — is month 164, more than two-thirds of the way through the term. That lopsided start is normal, not a rip-off: interest is priced on what you still owe. It is also why the levers that cut the balance early — a deposit, extra payments — do far more good than the same money later. The [guide to paying extra into your bond](https://bond.co.za/guides/pay-extra-into-bond) shows the years and rand it saves. The long view ## What does a bond cost in total interest? Over a full term, the interest can rival the loan itself — which is why the rate and the term matter as much as the price. Repay the R 1 500 000 bond above with the minimum R 15 228 a month for the full 20 years at a constant 10.75%, and the total repaid is about **R 3 654 824** — of which **R 2 154 824** is interest. You would pay the bank more than the original loan again, purely for the use of the money. Read that as an illustration, not a prediction: it assumes the rate never moves for 20 years, which no South African bond has ever experienced. Rates have moved in both directions over every real 20-year term. But the shape of the number is real — and it is why a quarter of a percent on the rate, or a few hundred rand of extra payment a month, compounds into hundreds of thousands of rand over a full term. Context ## What moved your rate in 2026 — and what to watch next Two 25bp hikes in six months. Every variable bond repriced on the effective dates, automatically. Prime is not a constant — it is whatever the MPC last made it. In 2026 the committee has met four times, and prime rose twice: SARB MPC decisions in 2026, with the repo and prime rate after each decision. From SARB MPC statements. | MPC statement | Decision | Prime after | | --- | --- | --- | | 23 Sept 2026 | +25bp | 10.75% | | 23 Jul 2026 | Hold | 10.50% | | 28 May 2026 | +25bp | 10.50% | | 26 Mar 2026 | Hold | 10.25% | Each of those 25 basis point rises added about R 254 a month to a R 1 500 000 variable bond — roughly R 509 a month more between May and September. The same mechanism works downward when the MPC cuts. The next scheduled announcement is **19 Nov 2026**, per the [South African Reserve Bank (SARB) — MPC announcement webcasts](https://www.resbank.co.za/en/home/what-we-do/monetary-policy/MPC-announcement-webcasts). What it will decide, nobody can tell you — this page does not predict MPC outcomes, and it is refreshed after every meeting. The levers ## How to pay less interest on your home loan Four levers, in the order they tend to pay off. None of them requires luck with rates. ### Put down a deposit Interest is charged on what you borrow, so every rand of deposit is a rand that never accrues anything. A 10% deposit cuts the balance on day one — and usually improves the margin the bank offers on top. ### Pay extra into the bond Extra payments go straight off the capital, so every future day accrues on a smaller balance — and the saving compounds for the rest of the term. On the example bond, even modest extras cut years off the term. The mechanics are in the guide to paying extra into your bond. ### Choose a shorter term A 20-year term costs less total interest than a longer one because the balance falls faster — at the price of a higher instalment. Run both terms through the bond calculator and compare the totals before you sign; the term is chosen once and is expensive to unwind. ### Get the rate itself as low as possible Approved borrowers average 0.67% below prime, which tells you the quoted rate is negotiable. Get priced at more than one bank before accepting an offer, and revisit it later — if another lender is cheaper, a bond switch moves you across. Comparing lenders and switching are covered step by step in the [negotiating guide](https://bond.co.za/guides/can-i-negotiate-my-home-loan-interest-rate) and the [bond switching guide](https://bond.co.za/guides/bond-switching-south-africa). Your situation ## Where do you stand right now? Two questions, no contact details — an estimated bond range and repayment at today's prime. ### Estimate what you could borrow Two questions, no contact details — an estimated bond range and repayment at today's prime, in rand, before you compare offers. Gross monthly household income (in rand) Deposit you plan to put down The honest answer ## What should you be careful of when reading figures like these? This page states what is publicly documented and computes the rest from standard formulas. Your bank's quotation is the final word. The worked examples hold the rate constant at 10.75% for the full 20 years. That is an illustration, not a forecast — prime has changed many times over every real 20-year term, in both directions. Banks set your final rate per application, from your credit profile, deposit and loan-to-value. The prime − 1.0% to prime + 2.0% band is an illustrative industry range, not a quote, and individual banks may price outside it. The margin band and the 0.67% average concession describe what other borrowers achieved — they do not predict what you will be offered, and no one can promise you a rate in advance. MPC outcomes cannot be predicted and this page does not forecast them — figures here reflect the last announced decision and its effective date, and are refreshed after every meeting. bond.co.za does not issue bonds and does not guarantee any lending outcome — it gives you a free pre-qualification estimate so you go to the banks prepared. Free estimate ## Know your number before the banks name theirs A free pre-qualification estimate on screen, based on the details you enter — then compare interest rate offers from the banks of your choice. [Check what you could qualify for](https://bond.co.za/#qualify) FAQ ## Home loan interest questions How is home loan interest calculated in South Africa?+ Interest is calculated daily on your outstanding balance and billed monthly. Each day the lender multiplies your current balance by your annual rate and divides by 365 — on a R1 500 000 bond at today’s prime of 10.75%, that is about R441.78 a day. Your monthly instalment then pays the accumulated interest first, with the remainder reducing the balance, so the interest portion shrinks every month as you pay down the capital. Why is my first home loan instalment mostly interest?+ Because interest is charged on the full outstanding balance, and at the start that balance is the whole loan. On a R 1 500 000 bond over 20 years at prime of 10.75%, the first instalment of R 15 228 splits into about R13 437.50 interest (88.2%) and only R1 790.93 capital. The split shifts month by month — principal overtakes interest around month 164 on this bond. What interest rate do South African banks charge on home loans?+ Banks price home loans at their prime lending rate — 10.75% since 25 Sept 2026 — plus or minus a margin set by your credit profile, deposit and loan-to-value. Offers across the major banks typically land between prime − 1.0% and prime + 2.0%, and approved borrowers average about 0.67% below prime (ooba Home Loans). Your final rate is per-bank and per-application; no public number guarantees what you will be offered. Why did my home loan instalment go up in September 2026?+ The SARB’s Monetary Policy Committee raised the repo rate by 25 basis points to 7.25% on 23 September 2026, effective 25 September. Banks passed it straight through: prime moved from 10.50% to 10.75%, and every variable bond repriced on the same date. On a R 1 500 000 bond over 20 years, that single 25bp move added about R 254 a month. How much interest will I pay on a R1.5 million home loan?+ At prime of 10.75% over 20 years, a R 1 500 000 bond repaid with the minimum instalment of R 15 228 a month costs about R 2 154 824 in interest — more than the original loan itself. That total assumes the rate stays constant for 20 years, which it will not; every rate move, and every extra rand you pay in, changes it. How can I pay less interest on my bond?+ Four levers move the number: put down a deposit (less capital means less interest from day one); pay extra into the bond whenever you can — extra payments go straight off the capital and compound over the term; choose a shorter term, which raises the instalment but cuts total interest sharply; and get your rate itself as low as possible by comparing offers from more than one bank — approved borrowers average 0.67% below prime. ## Sources Figures on this page are as at 26 Oct 2026. Each one comes from the source listed below, or is computed from those sources by the same calculation our calculators use. - [South African Reserve Bank — MPC statement, 23 September 2026](https://www.resbank.co.za/en/home/publications/publication-detail-pages/statements/monetary-policy-statements/2026/september)Repo 7.25% and prime 10.75%, effective 2026-09-25. Rate used in all worked examples. The SARB publication page was unreachable at retrieval time, so figures were cross-checked against contemporaneous reporting (Moneyweb, SANews) before use. Retrieved · 23 Sept 2026 - [Moneyweb — SARB ups repo rate to 7.25%](https://www.moneyweb.co.za/news/economy/sarb-ups-repo-rate-to-7-25/)Independent confirmation of the September 2026 repo decision and the prime rate of 10.75%. Retrieved · 26 Oct 2026 - [South African Reserve Bank (SARB) — MPC announcement webcasts](https://www.resbank.co.za/en/home/what-we-do/monetary-policy/MPC-announcement-webcasts)Next scheduled MPC announcement date. Retrieved · 23 Sept 2026 - [ooba Home Loans — major-bank rate band (illustrative)](https://www.ooba.co.za/resources/which-bank-has-lowest-interest-rate-on-home-loans/)Illustrative band of prime − 1.0% to prime + 2.0% across the major banks. Retrieved · 03 Oct 2026 - [ooba Home Loans — average rate concession reporting](https://www.ooba.co.za/resources/how-to-apply-for-home-loan/)Average concession of 0.67% below prime across registered bonds. Retrieved · 03 Oct 2026 ## Related guides and tools [ What is the prime lending rate?The benchmark your bond rate is built on. ](https://bond.co.za/guides/prime-rate)[ The repo rate explainedWho sets it, the MPC vote and the meeting calendar. ](https://bond.co.za/guides/repo-rate-south-africa)[ Paying extra into your bondHow small extra payments save years and interest. ](https://bond.co.za/guides/pay-extra-into-bond)[ Bond switchingMoving your home loan to a better rate at another bank. ](https://bond.co.za/guides/bond-switching-south-africa)[ Home loan rate comparisonWhat the major banks charge around prime. ](https://bond.co.za/home-loan-rate-comparison-south-africa)[ Bond repayment calculatorTest your own instalment and interest split. ](https://bond.co.za/bond-calculator) ## Informational disclaimer This guide is for information purposes only and does not constitute financial advice. Figures are attributed to their named sources and dated: prime and the MPC history come from SARB statements, and the bank pricing band and average concession from ooba Home Loans reporting. Instalments, interest splits and totals are illustrative calculations from the standard reducing-balance amortisation formula, not quotes, pre-approvals or guaranteed rates; they assume a constant rate, which real bonds do not experience. The rate you are offered depends on your credit profile, deposit and the bank’s assessment. Nothing on this page predicts future MPC decisions. bond.co.za is an independent educational resource and does not issue bonds or guarantee any lending outcome. Last updated: 26 Oct 2026. Keep reading ## More in interest rates The most recently updated guides in this category. [Interest rates](https://bond.co.za/guides/rates) [Fixed vs variable home loan rates](https://bond.co.za/guides/fixed-vs-variable-rate) Should you fix your home loan rate or stay variable: what each option costs at today’s prime, how the fixed-rate premium works, and the trade-off between certainty and flexibility. Updated 24 Oct 20267 min read [Interest rates](https://bond.co.za/guides/rates) [Prime lending rate today](https://bond.co.za/guides/prime-rate) South Africa's prime lending rate is 10.75% per annum, effective 2026-09-25 — the repo rate plus a 3.5-point spread. Banks actually price home loans from prime −1.0% to prime +2.0%, and each 25 basis point move adds about R170 a month per R1 000 000 borrowed. Updated 18 Oct 20267 min read [Interest rates](https://bond.co.za/guides/rates) [Interest rate forecast South Africa](https://bond.co.za/interest-rate-forecast-south-africa) Will interest rates go down in South Africa in 2026? Published SARB and bank-economist forecasts after the September 2026 hike, each attributed and dated, plus what a cut or hike does to your bond. Updated 17 Oct 20269 min read [Browse all interest rates guides →](https://bond.co.za/guides/rates) > This is the Markdown version of [https://bond.co.za/guides/how-home-loan-interest-works-south-africa](https://bond.co.za/guides/how-home-loan-interest-works-south-africa); that HTML page is the canonical version of this content.