Becoming self-employed changes the way you deal with tax. When you are employed, your employer deducts PAYE from your salary and pays it to SARS on your behalf. You receive your salary after tax, file an annual return, and usually do not have to think much more about it.
Self-employment is different. You receive your income directly, pay your own expenses, and must make sure your tax is paid to SARS. This is where provisional tax becomes important.
Provisional tax requires you to estimate your annual taxable income and pay tax on that estimate during the tax year. Many first-time self-employed taxpayers know that provisional tax exists, but do not realise how accurate their estimates need to be. They also often do not realise that interest and penalties can start building up before SARS sends any notice.
This article explains how provisional tax works, when it applies, and which first-year mistakes commonly lead to interest and penalties.
What Is Provisional Tax?
Provisional tax is not a separate tax. Under the Fourth Schedule to the Income Tax Act 58 of 1962, it is a way of paying income tax in advance, in instalments, during the tax year. Its purpose is to prevent taxpayers from facing one large tax bill after assessment.
Who Is a Provisional Taxpayer?
You are generally a provisional taxpayer if you earn income that is not subject to PAYE. This may include:
- income from a business or freelance trade;
- rental income;
- investment income above the applicable exemption; and
- director’s fees where PAYE has not been deducted.
Some natural persons are excluded if their income falls below certain thresholds, or if their only non-employment income is limited to specific categories and does not exceed R30,000 for the tax year from interest, dividends, foreign dividends, rental from the letting of fixed property, and remuneration from an unregistered employer (Budget 2026 Tax Guide). These thresholds and exemption amounts for the 2026 year of assessment should always be confirmed on SARS eFiling or the SARS website before you assume an exclusion applies.
All companies are automatically provisional taxpayers.
When Does the Obligation Begin?
Your provisional tax obligation starts when you begin earning non-PAYE income above the relevant threshold. There is no grace period.
For example, if you started trading in March 2026, your first IRP6 return would generally be due in August 2026. Not knowing that you had to register is not a defence.
The Two Compulsory Payments
First Period: August
The first IRP6 return and payment is usually due within six months of the start of the year of assessment. For a 28/29 February year-end, this is 31 August (or the last business day before that date if it falls on a weekend or public holiday). At this stage, only part of the tax year has passed, but your estimate must still cover the full twelve-month year.
The amount payable is generally half of the tax calculated on that estimate, less any PAYE already deducted.
Second Period: February
The second IRP6 return is due on the last day of the tax year, the last business day of February (28 or 29 February for a 1 March–28/29 February year). This estimate must reflect your best estimate of your total taxable income for the full year.
This return carries the most risk because SARS tests the second-period estimate against your actual taxable income when assessing underestimation penalties.
Optional Top-Up: September
A third, voluntary payment can be made by 30 September after the tax year-end (for a 28/29 February year-end). This can reduce or eliminate section 89quat interest on an underpayment.
However, it does not reverse an underestimation penalty that has already been triggered by an inaccurate February estimate.
What Your Estimate Must Include
Your IRP6 estimate must be based on total taxable income, not turnover or gross income. Taxable income is your income after allowable deductions, but before rebates.
Your estimate should include all relevant income sources, such as:
- business or freelance income, after deductible expenses;
- rental income;
- interest income above the annual exemption;
- taxable capital gains; and
- employment income where PAYE was deducted.
PAYE already deducted reduces the payment due, but it does not remove that income from the estimate.
SARS looks at your total income together. For example, if you earn R400,000 from consulting and R120,000 from rental income, SARS taxes the combined R520,000, not each amount separately. This can place you in a higher tax bracket than you expected.
The Basic Amount, and Why Year One Is Different
The basic amount is a “protection number” SARS gives you. It is usually your taxable income from your last SARS tax assessment, adjusted as SARS says (for example, if that assessment is older than 18 months, it is increased by 8% per year).
How it protects you:
- your total taxable income for the year is R1 million or less, and
- your second-period (February) estimate is at least equal to the basic amount,
then SARS will normally not charge you an underestimation penalty, even if your actual income is higher than you estimated.
Why your first year is different
In your first year of self-employment:
- You have never had a SARS income tax assessment yet(or at least none that covers this type of income).
- So there is no “last assessment”to use to calculate a basic amount.
- Therefore, you do not have this protection.
Because there is no basic amount to rely on:
- Your February self-estimated taxable incomemust be as realistic and accurate as possible.
- You should use:
- actual income you’ve already earned,
- realistic projections for the rest of the year,
- and credible estimates of your expenses.
If you underestimate too much, SARS can charge a 20% underestimation penalty plus interest, because you don’t have the basic amount to shield you.
Interest on Underpayment: Section 89quat
Section 89quat interest is separate from the underestimation penalty. It applies to an underpayment of provisional tax.
For taxpayers with a 28/29 February year-end, interest on a shortfall commonly begins after the voluntary top-up date for that year (typically 1 October), but the exact commencement date depends on which provisional period is underpaid and the taxpayer’s year-end. Interest runs until the date of assessment, at the prescribed rate. The rate changes and should be confirmed on SARS before relying on it.
Section 89quat interest can apply even where no underestimation penalty is charged.
Late Payment Penalty: Paragraph 27
A 10% penalty applies to late provisional tax payments. This is charged on the unpaid amount and can apply in addition to interest.
The Mistakes That Generate Interest in Year One
1. Not Registering Before August
Provisional tax registration is not automatic. You must activate the IRP6 tax type on your SARS eFiling profile.
SARS may not issue a reminder; taxpayers must register and file proactively. If you start trading in March and only register in September, you may already have missed the August deadline. Penalties and interest can then apply from the due date.
2. Estimating Only the Income Earned So Far
The August estimate must cover the full tax year. It should not only reflect income earned up to August.
If you base your estimate only on the first few months, your first payment may be too low. This can create a larger shortfall by February, when the underestimation penalty becomes a risk.
3. Leaving Out Other Income
Self-employed taxpayers often have more than one income stream. Rental income, investment income, and director’s fees must also be considered where applicable.
Leaving out one source of income can cause your estimate to fall below the required margin, especially because SARS taxes your combined income.
4. Overestimating Deductible Expenses
Many new businesses have high start-up costs, but it is risky to assume that expenses will remove the provisional tax obligation entirely.
If your expenses are lower than expected, or your income is higher than expected, your taxable income may be much higher than your estimate. Keep records throughout the year and adjust your estimate when circumstances change.
5. Underestimating the February Return
By February, most of the year’s income should be known or capable of being estimated with reasonable accuracy.
This is the estimate SARS tests for underestimation penalties. A higher payment may be uncomfortable, but it is usually better than a 20% penalty plus interest.
6. Thinking the September Top-Up Reverses the Penalty
The September top-up can reduce section 89quat interest by reducing the outstanding balance.
It does not cancel a paragraph 20 underestimation penalty that was triggered by an inaccurate February estimate.
7. Treating Provisional Tax as an Extra Tax
Provisional tax is not an additional tax. It is your income tax paid in advance.
The amounts paid are credited against your final tax liability at assessment. If you overpay, you may receive a refund. If you underpay, penalties and interest may apply.
8. Not Monitoring eFiling
IRP6 returns must be submitted electronically via SARS eFiling, SARS e@syFile, or through approved practitioner channels. SARS correspondence, notices, and assessments are also issued through eFiling.
If you do not monitor your eFiling profile, you may miss important notices while interest continues to accrue.
Practical Steps for First-Year Taxpayers
The first year of self-employment carries more risk because you may not yet have a reliable tax history or basic amount to work from. To reduce your exposure:
- register as a provisional taxpayer as soon as you start earning qualifying non-PAYE income;
- keep monthly income and expense records from the start;
- prepare a realistic full-year estimate for August;
- use actual income figures as far as possible for the February estimate;
- consider a September top-up if there is a risk of underpayment; and
- check SARS thresholds, interest rates, and deadlines for your year-end and the current tax year before each filing.
Conclusion
The first year of self-employment can create unexpected tax risk. Provisional tax requires you to estimate your full-year taxable income before the year is complete, pay tax in advance, and make sure the estimate is accurate enough to avoid penalties.
If the requirements are met, the paragraph 20 underestimation penalty is mandatory. Section 89quat interest can also accrue, even before the taxpayer fully realises there is a shortfall.
While every reasonable effort is taken to ensure the accuracy and soundness of the contents of this publication, neither the writers of articles nor the publisher will bear any responsibility for the consequences of any actions based on information or recommendations contained herein. Our material is for informational purposes.