Diesel at R31 a Litre: A Practical Cash Flow Guide for SA Businesses That Run on Fuel
On 6 May 2026, diesel went up R5.27 a litre. Petrol followed by R3.27.
The government tried to soften it. The temporary fuel levy on diesel was cut to zero, bringing total relief to R3.93/L after an additional 93c/L reduction in May, on top of the R3.00/L relief introduced in April. But the global oil price surge, driven by the US-Iran conflict and the closure of the Strait of Hormuz, overwhelmed the relief entirely. Brent crude moved from around $93 to over $101 a barrel during the review period. Diesel at the pump is now above R31 a litre.
Mixed Numbers Reported
To add to the turbulence, the Department of Mineral Resources and Energy initially published the wrong figure, announcing a R6.19/L diesel increase before correcting it to R5.27/L just hours before the adjustment took effect. For business owners already trying to plan around a volatile cost line, the mixed signals made a difficult week worse.
Could Petrol and Diesel Prices Keep Increasing?
The levy relief is in effect until 2 June. There will be another review. What happens after that depends on whether the Middle East situation stabilises and where the rand trades against the dollar. None of that is in your control.
Manage The Cash Flow Gap
What is in your control is how you manage the cash flow gap this increase has opened and whether you do it proactively or reactively.
This guide is for business owners in logistics, transport, construction, agriculture, catering, and security, any sector where diesel is a real operating cost, not a footnote.
Step One: Know Your Fuel Number
Most business owners know their monthly fuel bill in rough terms. Fewer have calculated what R5.27 per litre actually costs their specific operation.
The formula is straightforward:
Monthly fuel cost impact = Monthly litres consumed × R5.27
If your fleet or site equipment consumes 3,000 litres of diesel a month, you are paying R15,810 more every month than you were in April. At 10,000 litres, the May increase costs you R52,700 a month, on top of whatever the April adjustment already added.
Write that number down before anything else. It is the number that makes every other decision in this guide concrete.
Now ask the harder question: How much of that increase can you pass through to clients?
Businesses with flexible pricing or short-term contracts may be able to adjust rates. Businesses with fixed-price tenders, long-term supply agreements, or retail price points set by large retailers cannot. If you are in the second group, and most construction contractors, logistics operators on committed lanes, and FMCG suppliers are the full R5.27/L sits with you.
The Real Problem: The Gap Between Cost and Payment
Diesel hits your account the day you fill up or the day your fuel supplier invoices. Client payments arrive 30 to 60 days later and in practice, often longer.
That timing gap is where South African businesses get into real trouble. Not the price increase itself, but the mismatch between when you absorb the cost and when the revenue that covers it actually arrives.
Consider a transport business running 15 vehicles consuming roughly 20,000 litres of diesel a month. The R5.27/L increase costs that business R105,400 more in May than it spent in April. That R105,400 hits operating costs this month. The revenue from May’s work arrives in June or July. The business has to fund that gap from somewhere.
When businesses don’t plan for this explicitly, it tends to surface as something else: supplier payments run late, relationships get strained, a growth opportunity gets quietly shelved, and the owner spends the month managing the squeakiest wheels.
The businesses that navigate fuel cost cycles well are not necessarily the ones with the deepest reserves. They are the ones who quantify the gap early and make a deliberate decision about how to bridge it.
What to Do Now
1. Calculate the gap, not just the cost
The cost increase is one number. The cash flow gap is different; it is the cost increase multiplied by the number of weeks between when you pay for fuel and when your clients pay you. A business on 60-day terms with a R105,000/month exposure has a potential gap of R210,000 before revenue catches up.
2. Review your contracts and pricing structures
Identify which revenue streams allow for fuel-related price adjustment and which don’t. For those with no flexibility, decide now whether to renegotiate, absorb, or bridge the gap.
3. Talk to your fuel supplier
Some suppliers offer fixed-rate or hedged diesel arrangements for fleet operators with predictable monthly volumes. With another review point on 2 June, locking in some price certainty is worth exploring.
4. Look at payment terms from both sides
Are there clients where you can negotiate shorter payment terms: 30 days instead of 60? Are there suppliers where you can extend your own terms slightly? Neither conversation is easy, but both are easier than a cash flow crisis mid-month.
5. Stress-test June and July now
Run your numbers with the R5.27/L increase embedded and the current revenue pipeline in place. What does June look like? What about July, when winter trading patterns are also in play and the 2 June review creates another potential cost movement?
6. Decide whether working capital makes sense as a bridge
Short-term funding works well when the cash flow gap is real and temporary, when confirmed revenue ahead will cover both operating costs and repayment, and the cost of financing is less than the cost of the disruption.
Not sure if your business has a cash flow problem? Here are 5 warning signs.
A Note on When to Ask for Help
Genfin’s Business Funding Analysts work with businesses across logistics, transport, construction, and distribution every day. When a business owner calls us saying a fuel increase has opened a gap in their June cash flow, we get straight to it: we look at the numbers, assess whether the funding fits, and give you a clear answer.
We will not fund a business into a corner. If the numbers don’t support a repayment structure that works for you, we will say so. If they do, we move quickly, decisions within 24 hours once documents are in.
If you want to know whether funding is an option for your business right now, we are here.
Need funding as fuel prices climb?
Genfin offers flexible business funding from R100K to R3 million, with offers in 24 hours and no hidden fees. Apply now or get in touch with a dedicated business funding analyst who can help you find the right loan solution for your business.
Fuel price figures are based on the official adjustment announced by the Department of Mineral Resources and Energy, effective 6 May 2026, including the correction issued on 5 May 2026. The current temporary fuel levy relief on diesel runs until 2 June 2026.