The South African Reserve Bank (SARB) has initiated a formal review of the country’s long-standing prime lending rate, which has been fixed at repo plus 3.5% since 2001. While this review has attracted headlines, it is important to distinguish between structural reform and immediate financial impact. This review is about modernising how interest rates are referenced, not about lowering borrowing costs by decree.
Why is the prime rate being reviewed?
The prime rate is not set by regulation; it is a convention adopted uniformly by banks over time. Several developments now make that convention less fit for purpose:
- Benchmark reform: South Africa is in the final stages of transitioning away from the bank-calculated Johannesburg Interbank Average Rate (JIBAR) to the newer, near-risk-free transaction-based ZAR Overnight Index Average (ZARONIA) benchmark by the end of 2026, as part of a global move toward more robust, transaction-based reference rates.
- Clearer monetary policy transmission: The SARB’s move to a firmer 3% inflation target places greater emphasis on transparency and simplicity in how policy rate-changes flow through to households and businesses.
- Competition scrutiny: The Competition Commission is reviewing industry behaviour around prime, increasing pressure to reassess a rate that is uniformly applied but not formally governed.
- Policy signalling: SARB leadership has openly suggested that removing the “prime” label altogether may ultimately be the cleanest solution.
In short, prime increasingly looks like a legacy reference point in a system that has otherwise modernised.
What might change?
The review is still ongoing, but three broad outcomes are possible:
- Prime is replaced: Banks quote lending rates directly as repo plus a margin, removing the prime concept entirely.
- Prime is re-defined: The current 3.5% spread is formalised, adjusted, or given clearer governance.
- No material change: The SARB may conclude that the existing system works well enough and leave it intact.
Crucially, none of these options automatically reduce interest rates.
What is the direct impact on you?
For most borrowers, the practical impact will be limited:
- Your interest rate is already personalised. Home loans, vehicle finance, overdrafts and business facilities are priced based on credit risk, funding costs and competition – not on prime itself.
- Borrowing costs will not fall simply because prime changes. Banks already lend at “prime plus” or “prime minus” margins; changing the reference point does not change the economics.
- Transparency may improve. If loans are quoted directly off the repo rate, it may become clearer how SARB decisions affect your interest rate.
- Some contracts may need updating. If the prime benchmark is removed, existing loan agreements may require technical amendments, but without changing the underlying pricing intent.
For savers and depositors, the impact is similarly indirect. Deposit rates are determined by competition for funding and liquidity conditions, not by prime itself.
Why this matters?
Although this review is unlikely to change monthly bond repayments, it is structurally important. It forms part of a broader effort to:
- Align South Africa with global best practice in interest rate benchmarks
- Improve clarity and trust in monetary policy transmission
- Reduce reliance on opaque or outdated conventions
In that sense, the prime rate review is evolutionary rather than disruptive.
The bottom line
The SARB’s review of the prime rate is about how interest rates are referenced, not about easing financial conditions – you should not expect automatic relief on borrowing costs. Instead, the likely outcome is a simpler, more transparent system that better reflects how rates are already determined in practice.
We will continue to monitor developments closely and will update you as soon as the SARB provides further clarity on the final framework.