Provisional Taxpayer? Your First IRP6 Payment Is Due 31 August
If you earn income that doesn’t already have tax deducted through a standard payroll — business profit, freelance fees, rental income, or significant investment income — there’s a date you need on your radar right now: 31 August. That’s the deadline for your first provisional tax payment of the year, and getting it wrong can be far more costly than most people realise.
Here’s exactly who this applies to, how the payment is calculated, and what happens if you underestimate.
Who Actually Is a Provisional Taxpayer?
You’re generally classified as a provisional taxpayer by SARS if you earn income other than a standard salary that’s already fully taxed through PAYE. This typically includes:
- Business owners and sole proprietors, whose income isn’t taxed at source
- Freelancers and independent contractors, especially those invoicing multiple clients
- Company directors, in certain circumstances depending on how they’re remunerated
- Landlords and property investors earning rental income
- Individuals with significant investment income — interest, dividends, or capital gains beyond the standard exemption thresholds
If your only income is a salary from an employer who deducts PAYE correctly every month, you’re generally not a provisional taxpayer. But the moment you add a side business, rental property, or freelance income into the mix, provisional tax likely applies to you — even if PAYE is still being deducted from part of your income.
How the First IRP6 Payment Is Calculated
The provisional tax system works in two main payments across the tax year, with the first period covering March to August.
Step 1: Estimate your full-year taxable income. This isn’t just the income you’ve earned so far — it’s your best projection for the entire tax year (1 March to the following end of February), covering all income sources: business profit, rental income, freelance fees, interest, dividends, and any salary portion.
Step 2: Calculate the tax on that estimate using the standard SARS tax tables and rebates, just as you would for a normal annual tax calculation.
Step 3: Subtract any PAYE already being withheld for the year, if you have a salary component alongside your other income.
Step 4: Pay 50% of that net liability by 31 August. The second payment in February then reflects the balance, based on a refreshed, more accurate full-year estimate.
Many taxpayers use their “basic amount” — essentially their most recently assessed taxable income, adjusted upward if the assessment is more than a year old — as a reasonable starting point for the first period estimate. This approach carries lower penalty risk for the first payment specifically, though it’s worth confirming with a tax practitioner whether it’s the right approach for your situation, particularly if your income has changed significantly since your last assessment.
Important: even if your calculation results in nil tax payable, you still need to file the IRP6 return itself. A nil liability doesn’t mean no submission — skipping the return entirely can trigger an automatic SARS estimate and potential penalties of its own.
What Happens If You Underestimate
This is where provisional tax gets genuinely costly if it’s mishandled.
The 20% underestimation penalty
If your estimate turns out to be materially lower than your actual taxable income, SARS can levy a significant penalty on the shortfall:
- If your taxable income is over R1 million, your estimate needs to be at least 80% of the actual figure to avoid this penalty.
- If your taxable income is R1 million or less, your estimate needs to be at least 90% of the actual figure — or match your basic amount — to stay clear of it.
Fall short of these thresholds, and SARS can apply a 20% penalty calculated on the difference between what you declared and what you actually owed. The larger the gap, the larger the penalty — this isn’t a flat fee, it scales with how far off the estimate was.
The 10% late payment penalty
Separately from underestimation, simply paying late attracts its own 10% penalty on the outstanding amount, plus interest. This applies regardless of whether your estimate itself was accurate.
A recent tightening worth knowing about
As of early 2026, SARS has moved to close a gap some taxpayers were using: previously, submitting an accurate estimate but delaying actual payment could avoid the steeper 20% underestimation penalty, leaving only the smaller 10% late payment penalty in play. That safe harbour is being phased out — timely payment, not just an accurate estimate, is now required to avoid the more serious penalty. In short: filing an honest number is no longer enough on its own — paying it on time matters just as much.
A Simple Example
Say your estimated taxable income for the year is R600,000, and you have R40,000 of PAYE already being withheld from a part-time salary. SARS calculates the normal tax due on R600,000 using standard tax tables, subtracts the R40,000 already paid via PAYE, and splits the remaining balance into two equal instalments — one due by 31 August, the other by the end of February.
Your actual numbers will differ, but the structure is the same: estimate the full year, subtract what’s already been paid, and split the rest across your two IRP6 payments.
Don’t Wait Until the Last Few Days
Filing and paying are two separate actions on SARS eFiling — submitting your IRP6 return doesn’t automatically mean the payment has cleared. Banking delays are common in the final days before a deadline, so it’s worth submitting and paying a few working days before 31 August rather than on the day itself, especially given how much more seriously SARS is now treating payment timing.
If you earn any income outside a standard, fully-taxed salary, provisional tax is very likely part of your obligations — and 31 August is not a date to let slip past unnoticed. A reasonable, well-considered estimate paid on time avoids both the late payment penalty and the far steeper underestimation penalty, while an overly cautious guess just ties up cash you’ll only recover later. Getting the estimate right, and paying it on time, is the difference between provisional tax being a routine administrative task and an expensive surprise.
Not sure whether you’re a provisional taxpayer, or want a second opinion on your estimate before 31 August? Get in touch with CTF — we’ll help you calculate an accurate IRP6 estimate and make sure it’s filed and paid on time.
