• The SARB's own April 2026 Monetary Policy Review shows rate cuts "delayed to Q4" under its baseline — but scenarios show "it may be necessary to raise rates."

• An oil shock from the Iran war has pushed fuel inflation above 18% and is forecast to lift headline CPI to around 4%, breaching the bank's new 3% tolerance band

• The May 22 decision will reveal whether South Africa's year-old precision target holds under its first geopolitical stress test — with consequences across African monetary policy

South African Reserve Bank heads into its May 22 Monetary Policy Committee meeting with its most consequential rate decision in more than two decades, as an oil shock from the US-Iran war has reversed an easing cycle that began in late 2024 and exposed the credibility costs of the central bank's new, tighter inflation target.

The bank's own April 2026 Monetary Policy Review, titled "Anchoring in a Storm" and presented publicly on April 21, lays out the dilemma with unusual candour. Inflation stood at exactly 3.0% in February 2026, aligning with the 3% point target the SARB adopted in 2025 — its first target revision in 25 years. The oil shock triggered by the outbreak of fighting between the United States, Israel and Iran on February 28 then drove Brent crude from below $70 a barrel to a peak above $119, according to Bloomberg data cited in the presentation. The SARB's own forecasts, published in the document, project headline inflation rising "to around 4%" in the second quarter of 2026, with fuel inflation exceeding 18%, before returning to 3% by late 2027 under the baseline scenario. Under the bank's more severe oil-price scenario, the Quarterly Projection Model implies policy rates may need to rise, the document states.

"We have learned our lesson from the previous shock of 2002, where the target was lowered and when the shock came, we decided to go back to the old target. This time round, the inflation target is 3% and it remains 3%," Governor Lesetja Kganyago said at the April Monetary Policy Forum, according to the presentation transcript. ".

 The 2002 episode — when the rand halved in value and the SARB temporarily abandoned its framework before a costly re-entry — remains the central bank's institutional reference point for what happens when credibility breaks.

The bank's Quarterly Projection Model shows rate cuts "delayed to the fourth quarter" under the baseline, where Brent retreats gradually. Yet the same document maps two alternative scenarios — intermediate and severe — in which second-round effects through wages, core inflation and food prices grow materially, and where "it may be necessary to raise rates." Market pricing had already moved well ahead of these scenarios: by late April, Bloomberg consensus data cited in the presentation showed markets pricing roughly two 25-basis-point hikes in 2026, compared with two cuts anticipated before the conflict began. The SARB describes the shift as a complete inversion: "markets already shifted — now pricing in hikes."

Target architecture

The precision of the 3% target, a structural reform celebrated by the National Treasury in the February 2026 Budget as integral to lower borrowing costs and reduced debt-service expenses, has created an institutional exposure the former 3-6% band did not carry. Under that band, an inflation print of 4.2% — the level Investec's chief economist projected for May 2026 — would have remained within tolerance. Under the 3% ± 1 point framework, 4.2% technically exceeds the upper bound. The SARB's own April presentation acknowledges this asymmetry, noting that "uncertainty around inflation expectations and second-round effects" introduces "non-linearities" into the transmission of the oil shock — a coded signal that the standard toolkit may not be sufficient if expectations begin to drift.

The April presentation's data on inflation expectations is decisive for the May decision. Two-years-ahead expectations from the Bureau for Economic Research, South Africa's specialist survey, sat at a historic low going into the shock — the SARB presentation shows a chart confirming that "firms' view of the SARB's preferred target" had converged toward 3% through 2025 for the first time. But the bank notes explicitly: "the survey was in the field before the war started." Updated Bureau for Economic Research (BER) data, expected before the May 22 meeting, will either confirm that anchoring held through the shock or signal the drift that would make a rate increase almost unavoidable.

The National Treasury's February 2026 Budget, presented by Finance Minister Enoch Godongwana on February 25, had projected inflation averaging 3.3% over the medium-term expenditure framework and GDP growth of 1.6% in 2026, rising to 2% by 2028. Those projections were built before Brent exceeded $100. The Budget also extended the temporary R3.00-per-litre fuel levy reduction for a further period, at an estimated monthly cost to the fiscus of approximately R6 billion — a measure that partially offset the pump-price shock but whose cumulative cost is adding to a slate levy deficit that reached R14.2 billion at the end of March 2026, according to the Department of Mineral and Petroleum Resources. The department confirmed in its May 2026 fuel price statement that the slate levy alone contributed R1.23 per litre to the May 6 fuel price adjustment, on top of the pass-through from higher Brent and refinery margins.

Whether that space is sufficient to justify a hold on May 22, or whether the fuel shock of May 6 — the steepest single monthly diesel increase since inflation targeting began — has narrowed that window to zero, is the question only the updated BER expectations survey can answer. The SARB's next set of growth and inflation projections, to be published alongside the May 22 statement, will constitute the first formal reassessment of South Africa's economic outlook since the oil shock reached its full domestic effect.

Idriss Linge