How is a bonus or 13th cheque taxed?
A bonus is not taxed at a special, higher rate. The South African Revenue Service (SARS) simply treats a bonus as normal income, adding it to the total salary earned for the entire year.
It often feels like a bonus is taxed heavier because the extra money sits on top of a person's regular earnings. This means the entire bonus amount is taxed at the earner's highest applicable tax bracket, without the benefit of additional tax-free thresholds.
The "higher tax bracket" myth
A common myth is that earning a bonus pushes a person into a higher tax bracket, causing them to lose money and take home less than their normal salary. This is mathematically impossible in South Africa.
South Africa uses a progressive tax system. If a bonus pushes a person's total annual income into a new, higher tax bracket, only the specific amount that crosses the line is taxed at the higher rate. The underlying salary is still taxed at the lower rates. Earning more money always results in taking home more total money.
Why the tax deduction looks so large
To calculate monthly Pay-As-You-Earn (PAYE) tax, payroll systems take a person's monthly salary and multiply it by 12 to estimate their annual taxable income.
Every taxpayer receives a primary rebate — a discount that directly reduces their tax bill. For the 2026/2027 tax year, this primary rebate is R17,820. The payroll system splits this discount evenly across 12 months, lowering the standard monthly tax deduction.
When a bonus lands, the annual rebate and the lower tax brackets have already been fully applied to the regular salary. Because there are no more tax discounts left to apply, the bonus is taxed entirely at the employee's marginal rate — the percentage of their highest tax bracket.
Guaranteed 13th cheque vs performance bonus
How the tax is visibly deducted depends on the type of bonus being paid.
- 13th cheque: this is a fixed, guaranteed part of an employment contract. Because the employer knows exactly when and how much the 13th cheque will be, they can spread the tax for it evenly across all 12 months of the year. The payslip in the bonus month does not take a massive, sudden tax hit.
- Performance bonus: this is a variable, unpredictable payment. Because the employer does not know in advance if the bonus will be achieved, the tax cannot be spread out over the year. The entire tax impact is deducted in the exact month the bonus is paid out, making the deduction look unusually large.
The SARS refund mechanism
Occasionally, a very large, unexpected bonus causes a payroll system to mathematically assume the employee earns that massive amount every single month, leading to a temporary over-deduction of tax on that payslip.
This corrects itself at the end of the tax year in February. The employer issues an IRP5 certificate showing the exact total earned and the exact tax paid. When SARS processes the auto-assessment, it calculates the final tax due for the year. If the payroll software withheld too much tax during the bonus month, SARS pays the difference back to the taxpayer as a refund.
Terms used on this page
- taxable income
- The income tax is calculated on, after allowed deductions. For most salaried people it is roughly gross salary minus retirement contributions.
- rebate
- A fixed amount SARS subtracts from your calculated tax each year. It is what makes the first slice of income effectively tax-free.
- marginal rate
- The tax rate on your next rand of income — the bracket the top slice of your income falls into.
- IRP5
- The tax certificate an employer submits to SARS (and gives to you) showing your pay and the PAYE deducted. It is the main data behind an auto-assessment.
- auto-assessment
- An assessment SARS issues without you filing, built from data employers, banks, medical schemes and retirement funds already sent it. If it is correct it stands; if it is incomplete you edit and submit the return yourself.
Sources
Reviewed July 2026