SARS Auto-Assessment: Should You Just Accept It?

Every filing season, hundreds of thousands of South Africans get an SMS saying SARS has auto-assessed them. It feels like good news: no forms, nothing to do. But accepting an auto-assessment without checking it is one of the most expensive mistakes a taxpayer can make.

What an auto-assessment actually is

SARS builds it from third-party data — what your employer, medical scheme, retirement fund, and banks reported. It is a calculation based on what SARS was told. It is not a review of your personal circumstances.

What it usually gets right

• Your salary and PAYE from your IRP5
• Medical scheme contributions reported by your scheme
• Retirement fund contributions reported by your fund
• Interest reported by your bank

What it routinely misses

Anything SARS wasn't told about — which is exactly where most deductions live:

• Out-of-pocket medical expenses your scheme didn't refund
• Home office costs, if you qualify
• Travel claims against an allowance, where a logbook is required
• Section 18A donations to approved organisations
• Income or expenses from rental property or freelance work
• Contributions to a retirement annuity your fund reported late or not at all

If any of those apply to you, the auto-assessment is very likely understating your refund — or, if you have undeclared income, understating what you owe, which is its own risk.

What to do instead

• Read it before you accept. Check the income figures against your payslips and IRP5.
• Ask what's missing. Go through the list above honestly.
• File a full return if anything's missing. You are entitled to submit your own return rather than accept the auto-assessment.
• Mind the deadline. There are time limits on responding — leaving it too long removes your options.

The honest bottom line

An auto-assessment is a convenient starting point, not a verdict. If your tax life is genuinely just one salary and nothing else, accepting it is often fine. The moment you have medical costs, a side income, a travel allowance or a home office, it deserves a proper look.

ClaimX exists for exactly this moment: you upload what SARS didn't see, it matches everything to the right source codes, and shows you what the auto-assessment left on the table — before you accept it.