Your bonus after tax: why it feels smaller than you expected

In 30 seconds

A R40 000 bonus on a R40 000 salary leaves R27 600 - R12 400 goes to income tax, a 31% rate on every rand of the bonus.
Your salary is taxed at about 19% on average, but the bonus lands on top of it, so it is taxed at your highest bracket rate.
On a R20 000 salary the same method takes about 24% of a R20 000 bonus - R4 792 - leaving R15 208.

Why a bonus feels like it was taxed harder

Most people expect a bonus to be taxed like their salary. It is not, quite. Your salary is spread across the tax brackets: the first part is taxed at 18%, the next part at 26%, and so on. That gives you an average rate lower than your top rate. A bonus is extra income stacked on top of the year, so every rand of it is taxed at the highest bracket you reach, not the average.

The bonus is not taxed twice, and no special "bonus tax" exists. The effect comes from the progressive brackets alone. Come filing season, your total tax for the year is worked out on everything you earned, and the amount withheld through PAYE is reconciled against it.

The 2026/27 brackets

For the tax year 1 March 2026 to 28 February 2027, SARS publishes these rates for individuals:

Up to R245 100: 18% of taxable income.
R245 101 to R383 100: R44 118 plus 26% of the amount above R245 100.
R383 101 to R530 200: R79 998 plus 31% of the amount above R383 100.
R530 201 to R695 800: R125 599 plus 36% of the amount above R530 200.
R695 801 to R887 000: R185 215 plus 39% of the amount above R695 800.
R887 001 to R1 878 600: R259 783 plus 41% of the amount above R887 000.
Above R1 878 600: R666 339 plus 45% of the amount above R1 878 600.

The primary rebate is R17 820 a year, which is why nobody under 65 pays tax on the first R99 000.

Worked example 1: R40 000 a month

Take a salary of R40 000 a month, R480 000 a year, and a bonus of R40 000. We ignore medical credits and retirement deductions to keep the arithmetic visible.

Tax on the salary alone: R79 998 + 31% of (R480 000 - R383 100) = R79 998 + R30 039 = R110 037, less the R17 820 rebate = R92 217. That is about 19.2% of R480 000.
Tax with the bonus: on R520 000, R79 998 + 31% of R136 900 = R122 437, less R17 820 = R104 617.
Tax caused by the bonus: R104 617 - R92 217 = R12 400, which is exactly 31% of R40 000.
Left after income tax: R40 000 - R12 400 = R27 600.

Worked example 2: R20 000 a month

A salary of R20 000 a month is R240 000 a year, and the bonus is R20 000.

Tax on the salary alone: 18% of R240 000 = R43 200, less R17 820 = R25 380.
Tax with the bonus: on R260 000, R44 118 + 26% of R14 900 = R47 992, less R17 820 = R30 172.
Tax caused by the bonus: R30 172 - R25 380 = R4 792, about 24% of the bonus.
Left after income tax: R20 000 - R4 792 = R15 208. Part of the bonus fell in the 18% bracket and part in the 26% bracket, so the blended rate sits between the two.

What these figures leave out

UIF is 1% of pay up to a monthly ceiling, so a large bonus may add a small amount, or none if the ceiling is already reached that month.
Medical scheme credits and retirement contributions lower your tax. A retirement annuity contribution that covers the bonus can cut the bracket it lands in.
Your payslip may show a different figure than the tables above, because payroll systems apply their own PAYE method to annual payments and then true it up later.

We worked these examples from the published brackets and rebate directly. We could not load SARS's employer PAYE guide for bonuses, so the exact month-by-month withholding method is not confirmed here. The year-end tax result is what the examples show; the PAYE on your payslip can differ and is settled at assessment.

Three ways to plan for it

Plan with the after-tax number. Count on roughly 60% to 75% of the bonus, depending on your bracket, before you promise it to a holiday or a debt.
Decide the split before it lands. Assign the net amount to debt, your emergency fund or a tax-free savings account while the figure is still on paper.
Check the rate you actually pay on the next rand. That marginal rate, not the average, decides what a bonus or a raise is worth.

How MaxWealth helps

The income tax tool works out your tax from your own salary, with medical scheme credits and a retirement annuity slider, so you can run your salary with and without the bonus and see the difference for yourself.

Sources

2026/27 tax brackets, primary rebate of R17 820 and the R99 000 threshold under age 65: SARS - Rates of tax for individuals.
Worked examples: our own calculation from those published figures, before medical credits, retirement deductions and UIF.

Education, not financial advice. This post explains how the rules and the arithmetic work. It does not recommend any financial product, and your own situation may differ - speak to a registered financial adviser or tax practitioner before you act. Figures were checked against the linked sources on the date above.

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