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Bonus Tax Calculator · Pakistan
How much will your bonus actually cost you?
This shows the withholding impact, not a guaranteed exact figureFBR's exact month-by-month bonus withholding mechanic isn't published as a precise public formula the way the tax slabs are. This models the standard "annualize this month's total, including the bonus" approach that sources describe as causing the spike — your employer's payroll system may compute the exact rupee amount slightly differently, and any over-withholding gets trued up when you file your annual return.
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Extra tax caused by the bonus
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With vs. without the bonus
How this works
Why a bonus gets taxed at a higher rate
FBR withholding works by annualizing your income — taking a month's total payment, multiplying by 12, and applying the slab rates to that projected annual figure. A large bonus added to your regular salary in the same month can push that projected annual figure into a much higher slab, meaning a bigger share is withheld from everything you receive that month, not just the bonus.
It evens out at year-end
This isn't extra tax you actually owe overall — it's a bigger slice withheld upfront. Employers review the full year every June and correct any over- or under-withholding, and you can also claim a refund when you file your annual return if too much was taken out.
Assumptions & limits
Assumes the bonus is paid alongside your regular salary in the same month. Doesn't model your specific employer's exact payroll methodology, which can vary. Figures are for guidance only, not tax advice.