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Fixed vs variable home loan rates in South Africa

Almost every South African home loan starts on a variable rate that moves with prime. Your bank will offer to fix it, for a price. Fixing buys you a flat, predictable repayment. What it does not usually buy you is a cheaper one, and knowing the difference matters before you sign.

Updated 15 June 2026 · THL Property Group

A home loan rate is either variable, moving up and down with the Reserve Bank's prime rate, or fixed, locked at one number for a set period. Most bonds in South Africa are variable. The choice between the two is really a choice between certainty and cost.

How a variable rate works

A variable rate is quoted as prime plus or minus a margin set when the loan is granted, say prime less 0.5%. When the Reserve Bank moves the repo rate, banks move prime within days, and your repayment moves with it. As at June 2026 prime is 10.50% and the repo rate is 7.00%, with prime sitting a fixed 3.5 percentage points above repo. You carry the risk of rate rises, and you get the benefit of every cut.

How a fixed rate works here

Two things about fixing catch people out. First, you usually cannot fix at application: in South Africa you apply to fix only after the bond has registered, and the bank's offer to fix then lapses quickly, so you have to decide fast. Second, a fix is time-limited, commonly one to five years, with five years the maximum most banks allow. When the fixed term ends you revert to a variable rate. While you are fixed, you are protected from hikes and locked out of cuts.

The premium, and the honest trade-off

A fixed rate is not the current variable rate frozen in place. The bank quotes it at a premium above your variable rate, because it is taking on the risk you are trying to avoid. Published guidance puts that premium anywhere from about half a percent to two percent above the variable rate, depending on the bank and the term.

That premium is the whole story. The general finding, from originators like BetterBond and ooba, is that over time most borrowers pay a little more on a fixed rate than they would have floating, because the bank prices the certainty in. Fixing is not free insurance. You are buying a predictable repayment, not a cheaper one.

Nobody can tell you which way rates will go, and the bank has already built its own expectation into the fixed number. As at June 2026 the repo rate has just risen once, in May, after a long hold, so the near-term direction is genuinely uncertain. Be wary of anyone who sounds sure.

When fixing makes sense

There is a real case for it, and it is about affordability, not prediction:

• Your budget is tight enough that a payment rise would genuinely hurt. If certainty is worth more to you than the likely extra cost, fixing earns its premium. This is the strongest reason.
• You are risk-averse and will simply sleep better with a flat instalment, and you accept that you are paying for that.

What is not a good reason is a confident bet that rates are about to climb. You might be right, but you are betting against the bank's own pricing, and you give up the upside of any cut.

The better test

Before you decide, do the thing the choice is really about: stress-test your repayment. Model it at today's rate, then run it a couple of percentage points higher. If a two or three percent rise would break your budget, that is the real signal, and it argues for either a fix or a cheaper house, not a hopeful variable rate. The Rate Shock calculator does exactly this, and Bond Repayments shows what extra payments would save. For why the repo rate moves your bond at all, read what a 1% repo move does to your bond.

Money Cat is an information tool, not financial advice. Rates are as at June 2026 and the fixed-rate premium is a typical range, not a quote; the SARB has also consulted on replacing prime as the home-loan reference rate in future. Confirm any fixed-rate offer with your bank.