SARS collected over R2.15 trillion in revenue in the 2024/25 tax year — much of it from penalties and interest that businesses could have avoided. If you run an SME in South Africa, the chances are high that at least one of these five mistakes is costing you money right now.
1. Missing Provisional Tax Deadlines
Provisional tax is paid in two (sometimes three) instalments during the tax year — typically in August and February, with an optional third payment in September. Missing these dates triggers an automatic 10% penalty on the outstanding amount, plus interest at the prime lending rate.
The most common mistake is not registering as a provisional taxpayer when your income from business exceeds R30,000 per year. Many sole proprietors and small company directors simply don't know they qualify. If SARS discovers this during an audit, they can assess back taxes, penalties, and interest for up to five years.
The fix: Register as a provisional taxpayer as soon as your business income exceeds R30,000 annually. Set calendar reminders for every provisional tax period. Work with an accountant to calculate a reasonable estimate — paying too little (less than 90% of actual liability) triggers an additional 20% underestimation penalty.
2. Late or Incorrect VAT Submissions
Businesses with turnover above R1 million must register for VAT. VAT returns are due every two months (on the last business day of the month following the tax period) and every month for businesses with turnover above R30 million.
The two most expensive errors are: (a) submitting late, which incurs a 10% penalty on the VAT due plus interest; and (b) claiming input VAT on expenses where the tax invoice is invalid or missing. SARS is increasingly aggressive about invalid invoices during audits.
The fix: Register for eFiling and set automated reminders. Keep every supplier invoice and ensure each one has a valid VAT number, the supplier's name and address, the invoice date, and a unique invoice number. Never claim input VAT without a compliant tax invoice in your records.
3. Not Keeping Business and Personal Expenses Separate
Running business expenses through a personal bank account — or paying personal expenses from the business account — is one of the most damaging financial habits an SME owner can have. It creates two serious problems: you lose track of actual business profitability, and you create a compliance risk if SARS audits your books.
When personal and business finances are mixed, it's nearly impossible to accurately claim business deductions. You either over-claim (which is a SARS red flag) or under-claim (and pay more tax than you need to).
The fix: Open a dedicated business bank account before your first transaction. Pay yourself a salary or director's fee from the business account. This single habit makes bookkeeping dramatically cleaner and your tax submissions more accurate.
4. Incorrect Employee Tax (PAYE) Calculations
If you employ staff, you are required to register as an employer with SARS and deduct PAYE (Pay As You Earn), UIF (Unemployment Insurance Fund), and SDL (Skills Development Levy) from employees' salaries each month. These must be submitted and paid via the EMP201 form by the 7th of each month.
The most common mistakes include: calculating PAYE incorrectly when employees receive bonuses or commission; failing to account for fringe benefits (like vehicle allowances or medical aid contributions); and not reconciling employer submissions on the EMP501 at tax year-end (28 February).
The fix: Use SARS-compliant payroll software or outsource payroll to a professional. Never miss the 7th of the month. Reconcile your EMP501 meticulously — discrepancies are one of SARS's primary triggers for employer audits.
5. Not Claiming All Legitimate Deductions
South African tax law allows businesses to deduct a wide range of expenses incurred in the production of income. Yet many SME owners leave significant deductions on the table — either because they don't know they qualify, or because they haven't kept adequate records.
Commonly missed deductions include: home office expenses (if you work from home and have a dedicated work space); wear and tear on business equipment; business travel (actual costs or the SARS approved rate per kilometre); bad debts written off; and professional development costs directly related to your business.
The fix: Keep a logbook for business travel. Keep receipts for every business expense. Review your expense categories with an accountant at least quarterly — not just at year-end. The section 11 general deductions allowance in the Income Tax Act is broad; use it.
Most SME tax penalties in South Africa are entirely avoidable. The common thread through all five mistakes above is disorganised record-keeping and missed deadlines. A professional accountant pays for itself many times over in penalties avoided and deductions claimed.
How SGBS Group Can Help
At SGBS Group, we handle SARS compliance, provisional tax, VAT submissions, and payroll for SMEs across South Africa. Our monthly packages are designed to keep you permanently compliant — so you never have to worry about a surprise penalty again.
We work with businesses at every stage, from early-stage startups to established companies scaling for growth. If you're not sure whether your tax affairs are in order, get in touch for a no-obligation review.