South African credit is priced one of two ways: a fixed rate that stays the same for the agreed period, or a rate linked to "prime" that moves automatically whenever the Reserve Bank changes its own rate. Which one you have determines whether your repayment is predictable or can shift over the life of the loan — and there is a real regulatory proposal in motion that could eventually change how "prime" itself works.
What "prime" actually is
The South African Reserve Bank's Monetary Policy Committee sets the repo rate — the rate at which the SARB lends to commercial banks — at scheduled meetings roughly every 6 to 8 weeks. The prime lending rate is not itself set by the SARB: by a long-standing commercial convention (fixed in 2001 specifically to keep monetary policy transmission effective), banks add a 3.5 percentage point margin on top of the repo rate to arrive at prime. When the SARB changes the repo rate, banks typically adjust prime within a day or two.
Fixed vs. prime-linked (variable) — the actual trade-off
A fixed rate is locked for an agreed period: your repayment does not change no matter what the SARB does in the meantime. That certainty typically costs something — fixed rates commonly start somewhat higher than the equivalent variable rate at the time you sign.
A prime-linked (variable) rate is quoted as "prime plus" a margin (for example, "prime + 2%"), or for lower-risk borrowers sometimes "prime minus" a margin. It moves automatically every time prime does. Over a long loan term, that means periods where your repayment is lower than a fixed alternative would have been, and periods where it is higher — you carry the interest-rate risk yourself in exchange for a typically lower starting rate.
Which is used where in practice
Personal loans in South Africa are typically fixed for the life of the loan and quoted as a flat annual percentage — see our personal loans category, where every published rate is a fixed figure, not a "prime plus" formula. Home loans and vehicle finance, by contrast, are more commonly prime-linked by default, though home loan providers often also offer a fixed-rate option for a limited period once the bond is registered — check the specific terms with the lender, since exactly how long a fixed period is offered varies. See our vehicle finance explainer for how that category is priced specifically.
A real structural change that might be coming
In February 2026, the South African Reserve Bank published a consultation paper proposing to discontinue the prime lending rate altogether, replacing it with a new "SARB Policy Rate" as the reference for credit pricing. The Bank's stated reasoning is that prime has become an administrative benchmark that obscures how much monetary policy changes actually cost borrowers, rather than a transparent, direct base rate. The scale involved is large: the consultation paper estimates more than 12 million contracts, worth a combined R3.2 trillion, currently reference the prime rate, with retail mortgages and consumer loans making up roughly 37% of that exposure.
This does not affect your loan today. As of 2026 this is a consultation proposal, not a decided or implemented change — the earliest realistic start of any actual transition is 2027, and only after a related benchmark reform (the JIBAR cessation process) is completed first. The SARB's own plan anticipates legislative "safe harbour" protection for existing contracts and clear fallback terms for new ones. It is worth knowing about if you have a prime-linked loan, but nothing about how your current agreement is priced changes because of a consultation paper.
Frequently asked questions
Is a fixed rate always better than a prime-linked one?
No — it depends on the size of the premium you pay for certainty and how you expect rates to move over your specific term. There is no universally correct answer; it is a genuine trade-off between predictability and starting cost.
If prime goes up, does my monthly payment change automatically?
For a prime-linked agreement, yes — the lender recalculates your instalment when prime moves, typically to keep the loan on track to be repaid within the original remaining term.
Does the proposal to scrap the prime rate affect my existing loan right now?
Not currently. It is a 2026 consultation proposal with an earliest realistic transition date of 2027, and the SARB's own plan anticipates protective provisions for contracts already in place. Nothing changes for existing borrowers as a result of the consultation itself.
Compare real published rates — fixed personal loan rates, and prime-linked home loan and vehicle finance terms — across our personal loans, home loans and vehicle finance categories.