Every time the South African Reserve Bank (SARB) announces a change to the repo rate, the conversation turns to what it means for home loans. Here's a clear, practical explanation of how interest rate changes flow through to your monthly bond repayment.
How South African Home Loan Rates Work
South African home loans are almost universally variable rate (also called adjustable or floating rate). This means your interest rate is not fixed for the life of the loan - it moves up and down as the prime lending rate changes.
Prime rate = repo rate + 3.5% (by convention). The repo rate is set by the SARB's Monetary Policy Committee (MPC), which meets every two months.
Your bond rate = prime + or - a margin. If you have a good credit profile and a solid deposit, you might get prime minus 0.5% or even prime minus 1%. A higher-risk applicant might be offered prime plus 0.5% or more.
The Impact of Rate Changes on Your Repayment
Here's how a 25 basis point (0.25%) change in the repo rate flows through:
- Repo rate changes → prime rate changes by the same amount
- Your bond rate changes by the same amount
- Your monthly repayment changes
The rule of thumb: For every 1% (100 basis point) change in the interest rate, a R1 million bond over 20 years changes by approximately R750 per month.
| Bond Amount | 0.25% change | 0.50% change | 1.00% change |
|---|---|---|---|
| R1,000,000 | ~R190/month | ~R380/month | ~R750/month |
| R1,500,000 | ~R285/month | ~R570/month | ~R1,125/month |
| R2,000,000 | ~R380/month | ~R760/month | ~R1,500/month |
When Does Your Rate Change?
When the MPC announces a rate change, your bank adjusts your bond rate within a few days. You'll typically receive notification from your bank, and your next debit order will reflect the new repayment amount.
Most banks don't send a prominent notification - they simply debit the new amount. Check your statement after each MPC meeting if you want to track the change.
The Case for Paying Extra
Variable rate home loans in South Africa are typically structured as access bonds. Any additional amount you pay above the minimum repayment reduces your outstanding balance and therefore the interest you pay.
Paying an extra R2,000 per month into a R1.5 million bond at 11.25% over 20 years would:
- Save approximately R380,000 in interest over the loan term
- Reduce the loan period by approximately 4 years
This is one of the highest-return, lowest-risk financial strategies available to South African homeowners.
What to Do During Rate Cuts
When rates drop, your required repayment decreases. The smart move: keep paying the same amount you were paying before the cut. This reduces your outstanding balance faster and saves you interest over the life of the loan.