South Africa prepares for major switch from JIBAR to ZARONIA as December 2026 deadline looms

South Africa is moving away from the Johannesburg Interbank Average Rate (JIBAR) and adopting the South African Rand Overnight Index Average (ZARONIA), a change described in market commentary as one of the largest structural shifts for the country’s capital markets. The transition is underway and carries a regulatory deadline for full JIBAR cessation in December 2026.

Why the change matters

JIBAR has historically been based on survey estimates and was subject to manipulation, while ZARONIA is anchored on actual market transactions, making it a more transparent risk-free reference rate (RFR). The South African Reserve Bank (SARB) decided to move to ZARONIA to align with global benchmark reform programmes and to provide a more reliable reference for financial markets.

Early market activity and live pricing

Market participants and advisers say the transition has already produced live pricing references. RMB arranged South Africa’s first JSE-listed corporate bond linked to ZARONIA for Super Group Limited, giving the market an initial pricing benchmark for future issuances. Standard Bank issued Flac notes, raising over R2 billion, and became the first bank to offer floating rate notes linked to ZARONIA in a public auction.

Consultancy Elenjical Solutions noted that these transactions show early movers are helping to build the reference infrastructure necessary for broader adoption.

Operational and legal challenges

Despite early deals, market participants warn of remaining risks. Elenjical highlighted the operational complexity of the transition, saying institutions will need to update pricing models, contract systems and transaction processing systems to handle ZARONIA-based instruments.

“The most pressing risk is disruption – the transition requires a complete overhaul of existing systems, renegotiation of legacy contracts and updates to pricing models across portfolios,”

said Alisha D’sa, Senior Consultant at Elenjical.

The consultancy also warned that firms must ensure financial instruments and systems can accurately price and capture ZARONIA-linked instruments and must work through legal processes to renegotiate contracts and embed robust fallback clauses.

Time pressure for late movers

The announced timeline tightens the window for institutions that have not yet completed transition work. Elenjical said regulatory alignment with SARB guidelines is essential and that the December 2026 cessation deadline “leaves little room for delay in institutions still mid-transition.”

For organisations still transitioning, Elenjical recommended prioritising end-to-end testing of procedures and controls for ZARONIA-based instruments, noting early adopters have begun accumulating practical experience that latecomers will need to develop under greater time pressure.

What the market is watching next

• Further ZARONIA-linked issuances that expand live pricing references.
• Regulatory guidance and industry progress against the December 2026 JIBAR cessation mandate.
• Operational readiness across banks and corporates, including contract remediation and system upgrades.