How is a 13th cheque taxed in South Africa?

As ordinary remuneration. The bonus is added to your taxable income for the year, and PAYE is recalculated on the new annual total. Practically, payroll software annualises the bonus (multiplies by 12), works out the new annual tax, subtracts what was already withheld year-to-date, and deducts the difference in the bonus month — which is why December PAYE looks much heavier than usual.

Will I get more take-home if my bonus is paid in March instead of December?

No. The total annual tax is the same regardless of which month the bonus lands in. The only thing that changes is which payslip absorbs the higher deduction. Over the full tax year (March to February), you'll have paid exactly the same PAYE either way.

Why does my bonus PAYE feel like 40%?

Because the bonus is taxed at your marginal rate, not your average rate. If you earn enough to cross into the 36% or 39% bracket on the bonus rand, those rands are taxed there. Add UIF and possibly retirement contributions and the deduction can hit 40-45% on the bonus itself even though your overall annual tax rate is closer to 25%.

Can my employer reduce the bonus PAYE by spreading it over months?

Some employers do this — paying a smaller bonus monthly instead of one lump sum. The total annual tax is identical, but cash flow is smoother. SARS doesn't care which way it's structured, only that the total income for the year is correctly captured.

PAYE on bonuses & 13th cheques · invoicebook.co.za

The short version

A bonus or 13th cheque is taxed exactly the same as any other rand of salary — at your marginal income-tax rate. The reason it feels worse than a normal month is that the bonus stacks on top of your ordinary salary, pushing the bonus rand into a higher tax bracket than your usual remuneration sits in. Payroll software then catches up the year's PAYE in the bonus month, so the deduction line is two payments in one.

What payroll actually does

SARS gives employers two methods for working out PAYE on a bonus, and almost every payroll system uses the second:

Method 1 — actual: Calculate PAYE on the month's total (salary + bonus) using the monthly tax tables. Simple but produces an unstable monthly tax line, which doesn't match how SARS thinks about annual income.
Method 2 — averaging (the standard method): Annualise the bonus (treat it as if it were spread evenly across 12 months), recalculate the year's tax on the new annualised total, subtract what was already withheld year-to-date, and deduct the resulting difference as bonus PAYE.

Method 2 means the bonus tax line on your payslip is the entire year's tax catch-up, not just one month's tax. That's why it looks so big.

A worked example

Suppose you earn R45,000/month (R540,000/year) and you receive a R45,000 bonus in December (so a 13th cheque). Under-65, no medical aid, no RA contributions — just to keep the maths visible.

Annual income without bonus: R540,000 → annual PAYE roughly R109,000 → about R9,083/month
Annual income with bonus: R585,000 → annual PAYE roughly R124,800
Difference attributable to the bonus: R15,800
That R15,800 is deducted in December — on top of the normal ~R9,083 you'd already pay on your salary that month.

So the December deduction is about R24,883 — close to 28% of the December gross of R90,000. Compared to the previous month's R9,083 (roughly 20% of R45,000), it feels like the rate doubled. It didn't — you just paid all of the bonus's tax in one month.

The bracket-creep effect

The reason a bonus pushes more tax than the equivalent salary is that part of it gets taxed in the next bracket up. With our R540,000 example: the salary already used up the 26% and lower brackets. The bonus rands fall almost entirely into the 31% bracket. So at the margin, every R100 of bonus loses R31 to PAYE — much higher than the average rate on the rest of your income (which works out to about 20% across all your earnings).

Add 1% UIF (capped at R177.12), 7.5% to a retirement annuity, and possibly 1% to a medical aid, and your post-deduction take-home of the bonus can be 60-65% of the gross.

What about salary sacrifice for the bonus?

One genuinely effective lever: redirect part of the bonus into a retirement annuity. RA contributions are deductible up to 27.5% of remuneration, capped at R430,000 per tax year. If you redirect R20,000 of bonus into an RA, you reduce your taxable income by R20,000 — saving R6,200 of PAYE in the 31% bracket. The bonus still works for you, but in a tax-deferred wrapper. See our RA deduction calculator.

Year-end reconciliation

If the bonus pushed you over the threshold for compulsory auto-assessment, or if you have other deductions (medical out-of-pocket, donations, RA top-up) the ITR12 will recalculate the year's tax and either refund overpaid PAYE or bill you the shortfall. Most employees with only PAYE income end up roughly square.

Practical takeaway

The headline number on your December bonus is misleading. Use the PAYE calculator with your annual salary plus expected bonus to see what the year's total tax should be — that's the more useful figure than the December deduction line. If you're getting a big bonus and you have RA capacity, redirecting some of it to an RA is the cleanest way to reduce the immediate tax sting.