Provisional Tax Penalties in South Africa: Late Payment & Underestimation
Complete guide to provisional tax penalties including late IRP6 submission, underestimation penalties under Section 89quat, and interest on late provisional payments.
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What Is Provisional Tax?
Provisional tax is not a separate tax — it is a method of paying your income tax in advance, in two (or three) instalments during the tax year, rather than as a lump sum after the year ends. If you earn income that is not subject to PAYE (such as business income, rental income, or freelance income), you are likely a provisional taxpayer.
Provisional taxpayers must submit an IRP6 return and make a payment twice a year. Late submission or payment, and underestimation of your tax liability, all attract penalties.
Types of Provisional Tax Penalties
| Penalty | Trigger | Rate |
|---|---|---|
| Late Payment Penalty | Not paying by the due date | 10% of the amount due |
| ANC Penalty | Not submitting the IRP6 return | R250–R16,000/month (based on income bracket) |
| Interest | Outstanding balance after due date | 11.25% p.a. (daily) |
| Underestimation Penalty | Estimating too low on 2nd payment | 20% of the shortfall (Section 89quat) |
The Underestimation Penalty (Section 89quat)
This penalty is unique to provisional tax. If your second provisional tax estimate is less than 80% of the actual tax liability for the year (as finally assessed), SARS imposes a penalty of 20% on the shortfall — the difference between what you estimated and the actual taxable income.
This is designed to prevent taxpayers from deliberately underestimating their income to defer payment. The 80% threshold is calculated on the final assessed tax, not on the estimated amount.
Key Provisional Tax Deadlines
For individuals with a February year-end:
- First payment (IRP6) — due by 31 August (6 months into the tax year)
- Second payment (IRP6) — due by 28/29 February (end of tax year)
- Third (voluntary) payment — due within 6 months after year-end (by 30 September). This can reduce or eliminate underestimation penalties.
How to Avoid Provisional Tax Penalties
- Estimate conservatively — it is better to overestimate and get a refund than to underestimate and face a 20% penalty
- Use the third payment — if you realise your second estimate was too low, make a top-up payment within 6 months of year-end
- Keep accurate records — maintain monthly income tracking so your estimates are based on real data, not guesses
- Set calendar reminders — the August and February deadlines are non-negotiable
Use our Late Payment Calculator and Interest Calculator to see the full cost of late provisional tax payments.
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