SARS has ramped up its auto-assessment programme this year, issuing more than 1.9 million assessments within weeks of tax season opening. Refunds are landing in bank accounts within 72 hours, and the system feels faster and slicker than ever.
That speed is a double-edged sword. When your assessment arrives ready-made, it's tempting to assume everything has been captured correctly. In our experience working with South African taxpayers, that assumption costs people money every single year.
SARS auto-assessments rely entirely on data submitted by your employer, medical scheme, retirement fund provider, and other third parties. If any of those submissions are incomplete, late, or mismatched to your tax number, the deduction simply won't appear. And there's no flashing red warning on your assessment to tell you something is missing.
What is SARS auto-assessment accuracy, and why does it matter?
SARS auto-assessment accuracy refers to how completely and correctly your tax assessment reflects your actual financial situation for the year. An accurate assessment includes all your income, all the deductions you're entitled to, and all the tax certificates that should be on file.
When your auto-assessment is accurate, you get the refund you're owed — nothing more, nothing less. When it's not, you either overpay tax or risk an audit down the line if SARS later picks up an undeclared income source.
The catch is that SARS can only assess what it knows about. If your retirement annuity provider didn't submit your IT3(b) certificate on time, or if you changed jobs mid-year and one employer's IRP5 never arrived, those gaps won't magically fix themselves. You are the final line of defence.
Which deductions are most often missing from auto-assessments?
We see the same patterns every July. Here are the deductions that slip through the cracks most often:
Retirement annuity contributions from previous years
If you contributed more than the annual limit in a previous tax year, the excess should carry forward automatically to this year's assessment and appear on your notice. But when you've switched RA providers, changed jobs, or made a lump-sum contribution outside of payroll, that link can break. The excess contribution sits in SARS' system somewhere, but it doesn't show up on your current assessment.
Check your most recent ITA34 notice. There should be a line showing any unused retirement fund contributions carried forward. If that figure is missing — or looks unfamiliar — you'll need to submit a correction.
Medical expenses not claimed through your scheme
Your medical aid submits your monthly contributions and the scheme's portion to SARS automatically. What it doesn't submit: out-of-pocket expenses you paid yourself. Anything not covered by your scheme — specialists, dentists, scripts paid in cash, over-the-counter chronic medication — needs to be claimed manually.
If you didn't attach those supporting documents when filing, they won't appear in your auto-assessment.
Home office and travel deductions
SARS has no third-party data feed for home office expenses or work-related travel claims. If you work from home and meet the criteria, or if you keep a logbook and claim actual vehicle expenses, you must declare those amounts yourself. The auto-assessment will never include them unless you've filed a return with supporting schedules in previous years and the system has rolled them forward.
Rental income and freelance earnings
Any income earned outside of a formal employment contract — rental property, freelance work, side gigs — doesn't flow into the auto-assessment automatically. SARS expects you to declare it, along with any allowable expenses. If you skip that step, your assessment looks clean but it's technically incomplete.
The only person checking your assessment for gaps is you — or someone you trust to do it on your behalf.
How to review your SARS auto-assessment step by step
Log in to eFiling and download your full assessment notice
Don't just read the SMS summary. Open your eFiling profile, navigate to the Returns tab, and download the PDF of your assessment. You want the line-by-line breakdown, not the headline refund figure.
Cross-check every income source
Look at the "Income" section. Does it list every employer you worked for during the tax year? If you changed jobs, both IRP5 certificates should appear. If one is missing, contact that employer's payroll department and ask them to resubmit it to SARS.
Check the deductions section carefully
Scroll to medical expenses, retirement fund contributions, and any other deductions. Compare those figures to your own records — your RA statements, your medical aid tax certificate, your logbook totals if you claim travel. If something is lower than you expected, or missing entirely, that's your red flag.
Look for the carry-forward line
If you contributed to a retirement annuity in previous years and exceeded the limit, there should be a carry-forward amount on this year's assessment. Find the line labelled "excess retirement fund contributions from previous years" or similar wording. If it's blank and you know you had an excess, pull your last ITA34 and prepare to file a correction.
Don't accept the assessment until you're satisfied
You have until 23 October 2026 to submit a correction, even after accepting an auto-assessment. But it's easier to get it right the first time. If anything looks wrong, click "Request Correction" in eFiling and attach the supporting documents before you hit accept.
What happens if you miss a deduction?
Missing a legitimate deduction means you pay more tax than you owe. SARS won't volunteer a refund later — the onus is on you to spot the gap and claim it back within the allowed time window.
From July through to October each year, you can still submit a revised return through eFiling. After October, you'll need to file a formal dispute, which takes longer and requires more paperwork. If you're outside the three-year prescription period, the deduction is lost for good.
On the flip side, leaving out income — even by accident — is a compliance risk. SARS' systems are getting better at cross-matching data. If a third party reports income to SARS that you didn't declare, you may be selected for verification or audit. That's why a full review before acceptance is non-negotiable.
When should you consider getting help with your tax affairs?
Not everyone needs a tax practitioner. If your income comes from a single employer, you have a medical aid and maybe a retirement annuity through payroll, and you don't claim travel or rental deductions, your auto-assessment is probably fine after a quick review.
But if any of the following apply, it's worth speaking to a registered tax professional:
- You've changed jobs or had multiple employers in one tax year
- You contribute to a retirement annuity outside of payroll deductions
- You earn rental, investment, or freelance income
- You've carried forward excess RA contributions from previous years and aren't sure if they've been claimed
- You run a side business or work as an independent contractor
- You've received a large travel allowance and need to decide between actual costs and the SARS rate per kilometre
A qualified adviser can review your assessment against source documents, spot gaps the auto-assessment missed, and help you submit a clean, compliant correction before the deadline.
Can better financial planning help at tax time?
Absolutely. The taxpayers who have the smoothest assessments every year are the ones who keep their affairs organised throughout the year, not just in July.
Here's what helps:
Keep digital copies of every tax certificate. Don't wait for your employer or medical aid to reissue documents if something goes missing. Save your IRP5, IT3(b), and medical aid certificate the moment you receive them.
Track deductible expenses in real time. If you're claiming home office costs, travel, or out-of-pocket medical expenses, keep a simple spreadsheet or use a budgeting app that tags those transactions. Reconstructing six months of petrol slips in July is miserable work.
Review your payslip regularly. Check that your employer is deducting the correct PAYE each month and that any retirement fund contributions are showing up. Catching a payroll error in March is easier than fixing it retrospectively in August.
Understand your commitments before you borrow. Many South Africans take out personal loans or vehicle finance and then realise during tax season that their disposable income is tighter than they thought. If you're considering credit, factor in your monthly tax liability and your fixed deductions before you commit to a new repayment. It's not directly related to SARS auto-assessment accuracy, but it shapes your overall financial wellness — and that makes tax season less stressful.
What tax season teaches us about financial discipline
Every year, we see people surprised by their assessments. Sometimes it's a pleasant surprise — a bigger refund than expected. More often, it's frustration: a deduction they forgot to claim, a carry-forward amount that vanished, or income they didn't realise had been reported to SARS.
Tax season is really a mirror. It reflects how organised your financial life has been for the past twelve months. If you've kept good records, communicated with your employer and fund providers, and stayed on top of your paperwork, your assessment reviews itself. If you haven't, July becomes a scramble.
The good news is that improving your SARS auto-assessment accuracy isn't complicated. It just requires a deliberate review before you accept, a habit of keeping source documents, and the honesty to admit when you need professional help.
Treat your tax assessment like you'd treat any important financial document — read it properly, question anything that doesn't make sense, and don't sign off until you're confident it's right.
Frequently asked questions
Can I still fix my SARS auto-assessment after I've accepted it?
Yes. You can request a correction through eFiling until 23 October 2026, even if you've already accepted your assessment. Log in, go to your Returns, select the current tax year, and choose "Request Correction." You'll need to attach any supporting documents for the changes you're making.
Why doesn't my retirement annuity contribution from last year show on this year's assessment?
Retirement annuity contributions are deductible in the year they're made, up to 27.5% of your income or a maximum rand limit. If you contributed more than the limit, the excess should carry forward to the next year's assessment. If it's not showing, it may be because your RA provider submitted the certificate late, you changed providers, or the carry-forward wasn't captured. Check your previous year's ITA34 notice for the excess amount, then submit a correction with supporting documents.
What happens if I miss the October deadline to correct my assessment?
After 23 October, you'll need to lodge a formal dispute with SARS, which takes longer and involves more paperwork. If you're outside the three-year prescription period from the date of the original assessment, you generally lose the right to claim a refund for that tax year.
Does SARS automatically know about my rental income or side business?
No. SARS only auto-populates data it receives from third parties — employers, medical schemes, and fund administrators. Rental income, freelance earnings, and business income must be declared by you. If you don't include it, your assessment is incomplete, and you risk a compliance issue later.
How do I know if my auto-assessment is really accurate?
The only way to know for sure is to review it against your own records. Compare the income listed to your IRP5 certificates, check deductions against your RA and medical aid tax certificates, and look for any carry-forward amounts from prior years. If everything matches and nothing is missing, your assessment is accurate. If you spot a gap, request a correction before accepting.
This article is for general informational purposes only and is not financial advice. Spring Loans is a registered South African credit provider — please speak to a qualified financial adviser or registered credit provider before making borrowing decisions.
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