The Johannesburg Interbank Average Rate, known as JIBAR, is South Africa's main benchmark for short term interest rates. It reflects what major banks charge each other to borrow over periods ranging from one month to twelve months, and it feeds directly into loan pricing, deposit rates and derivatives contracts across the country's financial system.
Eight Banks, One Number: How JIBAR Gets Calculated
Eight banks submit bid and offer rates each trading day on negotiable certificates of deposit worth at least 100 million rand. For every bank, the Johannesburg Stock Exchange takes the midpoint between its bid and its offer. Then it throws out the two highest and two lowest of those midpoints and averages what's left, four numbers in total. That average becomes JIBAR for the day, published across one month, three month, six month and twelve month terms. The three month figure is the one lenders, investors and analysts watch most closely, since it underpins pricing on a wide range of loans and certificates of deposit in the domestic market.
Technically, JIBAR starts life as a yield calculation before being converted into a discount rate, the format banks use when they price and trade their own negotiable certificates of deposit. Beyond NCDs, the rate also carries some weight in foreign exchange forward pricing and in how banks price fixed deposit products, though its influence there is secondary to its core role in the interbank lending market.
Why Traders Use JIBAR Futures to Bet on Rate Moves
JIBAR's reach extends well beyond everyday lending. Short term interest rate futures, known as STIR contracts, use the three month JIBAR as their underlying benchmark. At expiration, the contract settles at a value of 100 minus whatever the three month JIBAR rate happens to be on that date. That inverse relationship is the whole point: when traders expect rates to climb, the contract's value falls, so anyone anticipating higher rates will short the position. Anyone betting rates are headed lower goes long instead.
These contracts give hedgers a way to protect against unexpected swings in South African interest rates, while giving speculators a relatively liquid, exchange traded vehicle to express a view on where rates are headed. Because the contract is standardized and trades on an exchange, it offers more transparency than a private agreement between two counterparties would.
From Safex Bank Bill Rate to a Nearly 12% Swing in History
South Africa's benchmark rate system traces back to the 1990s, when the South African Futures Exchange ran what was called the Safex Bank Bill rate. That system gave way to the current JIBAR framework in 1999, a change meant to bring more consistency to how interbank rates were set and published. The name itself has shifted too: before November 2012, JIBAR stood for the Johannesburg Interbank Agreed Rate rather than its current wording.
The numbers tell their own story about South Africa's economic history. According to the South African Reserve Bank, the three month rate averaged 8.19% from 1999 through 2020. It peaked at 16.96% in February 1999, in the aftermath of the emerging markets turmoil of that era, and hit a record low of 5.06% in September 2012, when the Reserve Bank was easing policy to support a sluggish economy. That range, nearly 12 percentage points from top to bottom, underscores how much interbank borrowing costs can move over two decades.
Current JIBAR readings are published daily through Thomson Reuters and Bloomberg, giving banks, corporate treasurers and investors a fast way to check where short term rates stand on any given day. South Africa isn't unique in relying on this kind of benchmark. Other markets run comparable systems, including the London Interbank Offered Rate, the Euro Interbank Offered Rate, and interbank offered rates used in Nigeria and Norway, each serving the same basic function of anchoring short term borrowing costs in its own currency.
What JIBAR Terms Actually Look Like
| JIBAR Term | Typical Use |
|---|---|
| One month | Short term interbank funding and pricing |
| Three month | Most widely referenced; underpins loans, CDs and futures |
| Six month | Medium term lending and deposit pricing |
| Twelve month | Longer dated funding and rate expectations |
For anyone holding a loan, savings product or derivative tied to JIBAR, the practical takeaway is straightforward: check which term applies to your product, since the three month rate moves differently than the twelve month rate depending on where the market expects policy to head next.
