Extra PAYE on a one-off bonus.
Net bonus kept
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Extra PAYE on bonus
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Effective rate on bonus
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Your breakdown
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Why a bonus feels so heavily taxed
The first thing people notice when a bonus lands is that the tax bite looks brutal compared with a normal month. That is not a penalty for bonuses, and there is no special bonus tax in Kenya. What is happening is simpler. A bonus is added to your taxable pay for the month it is paid, and the extra sits on top of your salary, so it is taxed entirely at your highest marginal PAYE rate. Your salary has already used up the cheaper lower bands, which means the bonus does not get the benefit of the 10 percent or 25 percent slices. It is taxed where your income already sits.
That is exactly how this calculator works it out. It computes PAYE on your normal pay, then PAYE on your pay plus the bonus, and the difference is the extra tax the bonus triggers. Because the personal relief is a fixed monthly credit that you already claim against your salary, it does not change when the bonus arrives, so the calculator deliberately works with the tax before relief on both figures. The relief is unchanged, so it correctly drops out of the comparison.
The PAYE structure the tool relies on
Kenya runs PAYE on a progressive monthly scale. The bands this calculator applies are 10 percent on the first KES 24,000 of taxable pay, 25 percent on the next slice up to KES 32,333, 30 percent from there up to KES 500,000, 32.5 percent up to KES 800,000, and 35 percent above that. These thresholds and rates are the figures modelled here, drawn from the Kenya Revenue Authority PAYE schedule, but Kenya has reworked its income tax through several recent Finance Acts, so confirm the current bands with the KRA before you treat any single figure as settled law.
A KES 50,000 bonus on an KES 80,000 salary
Suppose your regular taxable pay is KES 80,000 a month and you receive a one-off bonus of KES 50,000. Both your salary and the salary-plus-bonus figure already sit inside the 30 percent band, so every shilling of the bonus is taxed at 30 percent. Using the rates this calculator applies:
The effective rate on the bonus comes out at 30 percent, KES 15,000 of tax on KES 50,000. The relief cancels out because it applied equally on both sides. The chart shows the split between the bonus you keep and the slice PAYE claims.
When a low earner keeps far more of the bonus
The marginal logic cuts both ways, and that is the useful edge case. If your salary sits low in the scale, part of the bonus can be taxed at 10 percent rather than 30 percent. Take someone on KES 28,000 of taxable pay who gets a KES 20,000 bonus. The first portion of the bonus fills the remaining room in the 25 percent band before tipping into 30 percent, so the extra PAYE works out to roughly KES 5,783 rather than the KES 6,000 a flat 30 percent would suggest. Run your own salary through the tool and you will see the effective rate fall as the salary drops, because more of the bonus lands in the cheaper bands.
A practical tip. If your employer lets you choose timing, a bonus paid in a month when other taxable pay is unusually low, for instance unpaid leave earlier in the month, can be taxed a touch more gently, since PAYE is assessed month by month. The effect is modest and you should not contort your finances for it, but it is real. And remember the tool models the bonus as fully taxable cash. Genuinely tax-free items such as an exempt gratuity or a qualifying retirement contribution sit outside PAYE entirely, so confirm with the KRA or your payroll team how any specific payment is classified before assuming it is an ordinary taxable bonus.
Does the personal relief reduce the tax on my bonus?
Not on the bonus itself. The personal relief is a fixed monthly credit, the figure modelled here being KES 2,400, and you already claim it against your salary. Adding a bonus does not give you a second relief, so the relief washes out of the bonus calculation. That is why the extra tax is simply the difference in PAYE before relief.
Will statutory deductions like SHIF and the housing levy come off my bonus too?
Often yes, because SHIF and the Affordable Housing Levy are charged on gross pay and a cash bonus usually counts as gross pay for the month. This calculator isolates the PAYE effect only, so the net figure here is before any SHIF or housing levy that your payroll may also apply to the bonus. Check your payslip and confirm the current treatment with the KRA, since these contributions have changed recently.