How is a 13th cheque taxed in South Africa?

A 13th cheque is taxed at your marginal rate, exactly like the rest of your salary. It is not a separate kind of income with its own rate. SARS adds it to your annual pay and taxes the total on the normal table, so the extra tax it costs is its slice taxed at whatever band it falls into.

Where people get caught is the difference between a guaranteed 13th cheque and a discretionary bonus. They end up at the same annual tax, but the PAYE comes off at different times, and that timing is what makes a December payslip look alarming.

Guaranteed 13th cheque versus a discretionary bonus

A guaranteed 13th cheque is contractual: you know an extra month's pay is coming, so your real annual income is thirteen months. A discretionary bonus is decided when it is paid, so payroll cannot plan for it. That single difference drives how the PAYE behaves.

	Guaranteed 13th cheque	Discretionary bonus
Known in advance	Yes, it is part of the package	No, decided at the time
How payroll withholds	Can be spread across all months	Usually taxed in the month it is paid
Final annual tax	Marginal rate on the normal table	Marginal rate on the normal table
December surprise	Usually none if payroll spreads it	Possible over-deduction, corrected later

The bottom row is the point. The final tax is identical because both are remuneration on the same table. The experience differs because a known 13th cheque can be annualised from the start, while a surprise bonus often gets taxed heavily in its month and corrected afterwards.

A worked example

Take someone earning R20,000 a month, so R240,000 of normal salary for the 2026 year, who receives a 13th cheque of R20,000, lifting total pay to R260,000. Both figures sit in the second bracket, where tax is R42,678 plus 26% of the amount above R237,100.

Tax on R240,000 (no 13th cheque):

• R240,000 less R237,100 = R2,900
• R2,900 x 26% = R754
• R42,678 + R754 = R43,432
• Less the primary rebate of R17,235 = R26,197

Tax on R260,000 (with the 13th cheque):

• R260,000 less R237,100 = R22,900
• R22,900 x 26% = R5,954
• R42,678 + R5,954 = R48,632
• Less the primary rebate of R17,235 = R31,397

So the 13th cheque added R31,397 less R26,197, which is R5,200. That is exactly 26% of R20,000, because the whole 13th cheque fell inside the 26% band. There is no penalty rate and no separate 13th-cheque tax; it is one band applied to one extra month of pay.

What trues up on assessment

The R5,200 above is the real cost of the 13th cheque for the year. If your December PAYE looked far heavier than that, the likely reason is how payroll handles a lump in a single month, not a higher rate on the cheque. Where more PAYE came off across the year than your true annual tax, the excess is refunded when SARS assesses you, provided your banking details are correct and there is no debt, outstanding return, or verification in the way.

So the amount you actually part with for the year is fixed by the table and your total income. The month it leaves your account is a payroll question, and any genuine over-deduction returns to you on assessment.

Check the real cost of your 13th cheque

To see what your 13th cheque truly costs, work your tax with and without it. Our Basic income tax and PAYE calculator applies the 2026 SARS table and rebate, so you can read the difference directly. Our guide on how a bonus is taxed covers discretionary extra pay in more depth, our explainer on how PAYE is calculated shows the monthly annualising behind a December spike, and our piece on whether overtime is taxed more applies the same marginal-rate logic to extra hours.

SARS sources:

• https://www.sars.gov.za/tax-rates/income-tax/rates-of-tax-for-individuals/
• https://www.sars.gov.za/faq/if-im-getting-a-refund-when-does-the-72-hours-start/