If you have ever looked at your home loan statement and wondered what JIBAR means, you are not alone. But this financial term is about to become particularly relevant for South African homeowners, as the country moves towards replacing JIBAR with a new interest rate benchmark called ZARONIA.
The change is part of a broader reform of South Africa’s financial markets and is expected to affect certain existing loans and financial contracts that currently use JIBAR to calculate interest.
So, what exactly is JIBAR?
JIBAR stands for the Johannesburg Interbank Average Rate. In simple terms, it is a benchmark interest rate that has historically been used as a reference when determining the interest payable on certain financial products.
JIBAR is different from the prime lending rate, which is the rate most South African homeowners are familiar with when it comes to ordinary variable-rate home loans.
However, some loans and other financial contracts are linked to JIBAR rather than prime. This means that the change is particularly relevant to people and businesses whose agreements specifically reference JIBAR.
Why is JIBAR being replaced?
JIBAR has been used for many years, but financial markets around the world have been moving away from certain traditional benchmark rates towards newer rates that are considered more robust and transparent.
In South Africa, the preferred replacement is ZARONIA, which stands for the South African Rand Overnight Index Average.
ZARONIA is based on actual transactions in the overnight wholesale funding market. The South African Reserve Bank’s Market Practitioners Group has identified ZARONIA as the preferred successor to JIBAR for the majority of relevant South African financial contracts.
When will the change happen?
This is not an overnight switch.
The South African Reserve Bank has announced that JIBAR will cease to be published after 31 December 2026. In addition, a “no new JIBAR” initiative came into effect on 1 May 2026, meaning financial institutions should generally no longer enter into new contracts referencing JIBAR, subject to limited exceptions.
Existing JIBAR-linked contracts therefore need to be reviewed and, where necessary, transitioned to an appropriate replacement rate.
What does this mean if you have a JIBAR-linked home loan?
This is where homeowners need to pay attention.
If your home loan is linked to JIBAR, your lender will need to move the loan to an appropriate replacement rate once JIBAR is no longer available.
The intention is for this transition to take place in an orderly manner and to avoid creating an unfair financial advantage or disadvantage for either the borrower or the lender.
One of the mechanisms being used is a Credit Adjustment Spread (CAS).
In simple terms, JIBAR and ZARONIA are calculated differently and do not contain exactly the same components. A spread may therefore be added when moving from JIBAR to ZARONIA to help ensure that the transition does not, simply because of the change in benchmark, transfer economic value from one party to another.
The methodology for determining this adjustment has now been endorsed at industry level. Importantly, the actual CAS values will only be finalised once the JIBAR cessation process reaches the relevant stage.
Will everyone’s home loan change?
No.
The JIBAR reform does not mean that every South African homeowner’s mortgage will suddenly change from JIBAR to ZARONIA.
The impact depends on the terms of your particular loan agreement and the reference rate used to calculate your interest.
For many homeowners whose loans are linked to the prime lending rate, the JIBAR transition will not directly change the way their home loan interest is calculated.
The reform is particularly relevant to existing loans and contracts that specifically reference JIBAR.
What should homeowners do?
If you are unsure whether your home loan is linked to JIBAR, it is worth checking your loan agreement or contacting your bank.
If your loan does reference JIBAR, your lender should provide information about the transition and explain how the change will be implemented.
It is also important not to assume that the move to ZARONIA automatically means your interest rate will increase or decrease. The purpose of the transition arrangements is to provide a structured way of replacing the discontinued benchmark while limiting unintended economic effects.
A changing financial landscape
The move from JIBAR to ZARONIA may sound like a technical change affecting only banks and financial markets, but it is an important development for anyone whose financial agreement is linked to JIBAR.
With JIBAR scheduled to cease at the end of 2026, financial institutions are already preparing for the transition. For consumers with JIBAR-linked loans, the key message is simple: know what reference rate your loan uses, understand what your lender is proposing and ask questions if you are unsure about how the change will affect you.
As with any financial or contractual change, understanding the terms of your individual agreement is essential.