Getting a grip on company tax in South Africa is not just for accountants. Owners, finance leads and anyone involved in business financial planning benefit from knowing the headline rate, how losses carry forward, and which allowances actually move the needle.
The corporate tax rate in 2025
The standard corporate income tax rate is 27% for years of assessment ending on or after 31 March 2023. Small Business Corporations follow a separate progressive table, while certain sectors have bespoke regimes. Always check your year-end because the rate tracks the year of assessment, not the calendar year.
Assessed losses: what changed and what still matters
South Africa lets companies carry forward assessed tax losses, provided they continue to carry on a trade. From years of assessment ending on or after 31 March 2023, the set-off in any profitable year is limited to the higher of ZAR 1 million or 80% of taxable income before the loss set-off. In short, at least 20% of that year’s taxable income remains exposed to tax once you pass the ZAR 1 million threshold.
The “trade” requirement is not window dressing. SARS’ interpretation note confirms you must be trading in the current year to retain and apply the balance of assessed losses. Stop trading and you risk losing that pool. A later binding general ruling also clarifies that the 80% cap is measured against taxable income as a whole rather than only “trading” income.
A quick numeric example
Say your company shows ZAR 5 million taxable income before the loss set-off and carries a ZAR 12 million assessed loss from prior years. The higher of ZAR 1 million or 80% of ZAR 5 million is ZAR 4 million, so you can set off ZAR 4 million this year. You will be taxed on ZAR 1 million and carry ZAR 8 million forward. The cap does not erase losses; it staggers their use across profitable years.
Capital allowances you should know
Wear-and-tear (section 11(e)). This is the workhorse deduction for most plant, equipment and office kit. SARS publishes acceptable write-off periods and expects a “just and reasonable” method where no specific period is prescribed. Keep an asset register, useful life support and apportion where assets are not used 100% for trade.
Manufacturing plant and similar processes (section 12C). New or unused qualifying machinery used directly in a process of manufacture may be written off on a 40% then 20% per year over the next three-year pattern. This accelerates relief compared with standard wear-and-tear and is often decisive when scoping capex.
R&D incentive (section 11D). Approved scientific or technological R&D qualifies for a 150% deduction on operational spend, plus an accelerated 50:30:20 write-off for qualifying capital assets. The incentive has been extended and currently runs to 31 December 2033, but you need DSI approval for each project to claim.
Renewable energy: the 125% window has closed
Government introduced a temporary 125% deduction for businesses investing in renewable energy assets. It applied to assets brought into use from 1 March 2023 up to and including 28 February 2025, after which the enhancement ended and the system reverted to the ordinary rules. If your project missed the window, model it under standard section 12B or other relevant allowances.
Planning pointers for 2025
Loss timing matters. If your forecasts show a return to profit, you may prefer to cluster deductible spend into that first profitable year to soak up the ZAR 1 million or 80% headroom, then spread the remainder. A clear tax pack, robust board papers for major capital projects and contemporaneous documentation for R&D approvals make reviews easier and cut noise later. When in doubt, get expert tax advice early and keep it on file.
Transactions and the tax–commercial link
Mergers, hive-downs and unbundlings rely on both the tax rules and the Companies Act processes. Asset classifications drive allowances, while accounting judgements affect timing and disclosures. Workflows that align finance, deal teams and corporate legal services reduce the risk of losing deductions, missing claim windows or tripping continuity tests.
Common pitfalls that cost money
- Dormancy without planning. Suspending trade can imperil your carried-forward loss. If activity drops, ensure the company still carries on a trade in a real sense.
- Wrong asset bucket. Mixing manufacturing kit under section 12C with general office equipment under section 11(e) in a single pool leads to errors. Keep categories clean.
- R&D without approval. Spending first and applying later risks a denied 150% claim. Build the DSI application into the project plan.
- Assessed loss cap surprises. Cash tax can arise even with large historic losses once profit returns. Update cash flow models to reflect the 80% or ZAR 1 million rule.
Final thought
South Africa’s 27% rate, the modern loss limitation and a mix of capital allowances create a system that rewards investment if you map the rules to your operating cycle. Keep an eye on year-end, watch the assessed-loss cap as profits return, and choose the right allowance for each asset class. With tidy records and timely claims, the numbers stack up.Ready to optimise your 2025 tax position? Book a 15-minute consultation with Dauds Advisory. Use the contact page to request a call, and we’ll outline a clear, practical plan for your next filing period.