Last updated 23 September 2026 · Written by Kgothatso Moleke · General information, not financial advice
The short version: petrol went up R1.34 a litre this month, diesel went up more than R3, and today the Reserve Bank raised the repo rate. Coverage tends to treat these as separate stories. Your budget does not. For a household with a R1 million bond that fills a 50-litre tank weekly, September costs roughly R459 more a month than August did.
What actually changed
- Fuel, from 2 September. Petrol 93 and 95 both rose R1.34 a litre. Inland 95 is now R26.92. Diesel rose far harder: R2.94 on 500ppm and R3.15 on 50ppm.
- The repo rate, from 25 September. The Reserve Bank raised it 25 basis points to 7.25%, taking prime from 10.5% to 10.75%. The decision was unanimous.
- Inflation. Headline consumer inflation was 4.4% in August, up from 4.3% in July. Still inside the target band, but rising.
What the rate hike costs you
If your bond or car finance is linked to prime, which most are, your repayment goes up automatically. Nobody asks you.
Work out your own figures: the rate change calculator takes your bond balance, car finance and fuel use and tells you exactly what this month costs you — per month and over the rest of each loan.
New to how this works? How interest rate changes affect what you pay explains the repo-to-prime-to-your-instalment chain, which debts move and which do not, and what to do in either direction. This page covers only what changed this month. For how a fuel increase spreads through taxi fares and the shelf, read what a fuel increase actually does to your budget.
| Bond over 20 years | Extra per month | Extra over the term |
|---|---|---|
| R800,000 | R135 | R32,350 |
| R1,000,000 | R168 | R40,438 |
| R1,500,000 | R253 | R60,657 |
| R2,000,000 | R337 | R80,876 |
| R3,000,000 | R505 | R121,313 |
Car finance moves too, though less dramatically because the term is shorter. On a R250,000 vehicle over six years, expect roughly R33 a month more.
The part worth noticing: a quarter point sounds trivial. On a R1.5 million bond it is R60,657 across the term. Small rate moves are not small.
What the fuel increase costs you
R1.34 a litre sounds manageable until you multiply it by how often you actually fill up.
| Tank size | Extra per fill | Extra per month, filling weekly |
|---|---|---|
| 40 litres | R53.60 | R232 |
| 50 litres | R67.00 | R290 |
| 60 litres | R80.40 | R348 |
If you drive diesel, it is worse. At over R3 a litre, a 60-litre diesel fill costs about R189 more than it did in August.
And fuel does not only hit you at the pump. It moves the price of everything that travels, which is nearly everything. Transport inflation was already running at 8.8% in August, with fuel inflation at 20%. That feeds into food prices with a lag of a month or two.
Add it up
Take a household with a R1 million bond, a R250,000 car on finance, and a 50-litre tank filled weekly.
- Bond: R168 more a month
- Car: R33 more a month
- Fuel: R290 more a month
- Total: about R491 a month, before food prices catch up
That is roughly R5,900 over a year, from two announcements three weeks apart, for a household that changed nothing about how it lives.
What actually helps
Some of the standard advice is noise. These are the things that move real money.
Check your bond rate, not just your repayment
If you took your bond when your credit record was weaker, you may be paying prime plus a margin that no longer reflects your risk. Banks do not volunteer a better rate. You have to ask, and you can switch. On a R1 million bond, moving from prime plus 1% to prime is worth far more than the hike just cost you.
Attack the most expensive debt first
A rate rise hurts most on the debt with the highest rate. That is almost never your bond. Store accounts and personal loans run far above prime, and every extra rand you put there is worth several put against the house.
Fill up before the first Wednesday
South African fuel prices change at midnight on the first Wednesday of the month. When a rise is announced, filling up the day before is a real, if small, saving. When a drop is coming, waiting is.
Cut driving before you cut food
Combining trips, lifting a colleague, or dropping one weekly trip does more than most grocery-aisle savings, because fuel is the line that actually moved. Cutting food quality to absorb a petrol increase is the wrong trade.
Do not fix your rate in a panic
Fixing usually costs a premium over the linked rate, and you are buying it at the moment it is most expensive. If a further rise would break your budget, the problem is how much you have borrowed, and fixing only delays it.
If this one pushes you over
For some households R491 a month is an irritation. For others it is the difference between covering the debit orders and not.
If you are now short every month, act before you miss a payment rather than after. A missed payment marks your credit record and costs you on every rate you are offered for years afterwards. Work out where you actually stand with the affordability calculator, and if the gap will not close, read debt review before things reach a default.
Rates move in both directions. The repo rate was cut twice in 2025 and has now risen twice in 2026. What does not reverse is a damaged credit record, which is why protecting it matters more than timing the cycle.
Sources
- South African Reserve Bank — MPC decision of 23 September 2026, repo rate raised 25 basis points to 7.25%, effective 25 September
- Department of Mineral Resources and Energy fuel price adjustment, effective 2 September 2026
- Statistics South Africa — Consumer Price Index, August 2026: headline inflation 4.4%, transport 8.8%, fuel 20.0%
This is general financial education, not advice about your circumstances. Figures are illustrative and assume a rate linked to prime. Your actual repayment depends on your agreement. Rates and fuel prices change monthly.