7 Common SARS Mistakes South African SMEs Make (And How to Avoid Them)

In our years of practice, we've seen the same tax mistakes cause real financial harm to otherwise well-run businesses. The good news: every one of them is avoidable. Here are the seven errors that cost South African SMEs the most — and what to do instead.

Mistake 1: Filing Returns Late

South Africa's tax calendar has hard deadlines. Miss a VAT return, fail to submit your provisional tax on time, or ignore an ITR14 due date — and SARS will issue penalties automatically. Administrative penalties can reach R16,000 per month of non-compliance, and interest accrues at prime + 1% on outstanding balances.

Fix: Keep a tax calendar with all your deadlines highlighted. Better yet, engage a registered tax practitioner who monitors and manages these dates for you.

Mistake 2: Underreporting Income

Some business owners don't include all revenue streams in their tax return — particularly cash income or payments received via personal accounts. SARS cross-checks income declarations against banking data, VAT returns, and third-party information from clients. Underreporting triggers an audit and a substantial understatement penalty (up to 200% of the understated tax).

Fix: Declare all income. Every rand received for services or goods rendered is taxable unless explicitly exempt.

Mistake 3: Overclaiming Deductions

Personal expenses passed through the business, non-deductible entertainment costs claimed as business expenses, or inflated home office claims are red flags in SARS's risk detection systems. Over-claiming deductions can trigger a comprehensive audit of your entire tax history.

Fix: Maintain a clear separation between personal and business finances. Only claim deductions with valid supporting documentation. Our guide on allowable deductions outlines what you can legitimately claim.

Mistake 4: Missing Provisional Tax Payments

Provisional tax is often overlooked by self-employed individuals and business owners who are used to PAYE thinking. The two provisional tax payments (August and February) catch many by surprise — especially the first-time taxpayer who receives a large year-end assessment.

Fix: Estimate your annual taxable income early and budget for provisional tax payments. Under-provision by more than 90% of the actual tax due and you'll pay a 20% understatement penalty on the difference.

Mistake 5: Not Registering for the Right Tax Types

When you hit the R1 million VAT threshold, you have 21 days to register. Many business owners don't realise they've crossed it until much later — resulting in back-dated VAT liability paid from their own pocket. Similarly, new employers often fail to register for PAYE, UIF, and SDL promptly.

Fix: Track your turnover monthly. Once you approach R900,000 in any 12-month period, initiate VAT registration. Read our complete guide on VAT registration for the exact process.

Mistake 6: Poor Record Keeping

SARS requires you to retain financial records for 5 years. If you cannot produce invoices, receipts, contracts, or bank statements when required, you lose your right to claim related deductions — and SARS may estimate your income, which is rarely in your favour.

Fix: Implement a proper bookkeeping system from day one. Digital records are acceptable. Store everything securely with backups.

Mistake 7: Ignoring SARS Correspondence

Many taxpayers receive notices from SARS (via eFiling) and ignore them because they don't understand what is being asked. SARS sends verification requests, audit notifications, and assessment notices with response deadlines. Miss a deadline and you lose your right to object.

Fix: Check your SARS eFiling inbox regularly. If you receive a letter from SARS and don't understand it, contact a registered tax practitioner immediately — time is always of the essence.