Bonus tax in Pakistan: why your next payslip looks wrong
Bonus season produces more payroll queries than any other event, and almost all of them come down to one misunderstanding: people expect the bonus to be taxed, and instead the whole year gets recomputed.
What actually happens
Under section 149 an employer maintains a running projection of your annual taxable salary. A bonus changes that projection, which changes the annual tax, which changes every remaining monthly deduction. The steps:
- Add the bonus to projected annual taxable salary.
- Recompute annual tax on the revised figure using the slab table.
- Subtract tax already deducted year to date.
- Divide the balance across the payroll months remaining in the tax year.
Nothing in that sequence taxes the bonus at a special rate. See section 149 for the underlying mechanics.
Worked example: Rs 400,000 bonus in month seven
An employee on Rs 200,000 a month receives a Rs 400,000 bonus in January, the seventh month of the tax year.
| Step | Figure |
|---|---|
| Original annual projection (Rs 200,000 × 12) | Rs 2,400,000 |
| Original annual tax: Rs 116,000 + 20% × Rs 200,000 | Rs 156,000 |
| Monthly deduction to month six | Rs 13,000 |
| Deducted in six months | Rs 78,000 |
| Revised projection with bonus | Rs 2,800,000 |
| Revised annual tax: Rs 116,000 + 20% × Rs 600,000 | Rs 236,000 |
| Balance to collect over six remaining months | Rs 158,000 |
| New monthly deduction | Rs 26,333 |
You draw a salary, tax is deducted at source every month, and you want the return filed properly without spending a weekend inside IRIS.
Timing changes the payslip, not the tax
Same employee, same bonus, three different months:
| Bonus paid in | Months remaining | New monthly deduction |
|---|---|---|
| Month 2 (August) | 11 | Rs 20,545 |
| Month 7 (January) | 6 | Rs 26,333 |
| Month 11 (May) | 2 | Rs 74,000 |
The annual tax is Rs 236,000 in every case. Only the collection profile changes. A bonus paid in the last month of the tax year concentrates the whole remaining liability into one or two payslips, which is why late-year bonuses generate the most complaints.
When a bonus crosses a slab boundary
If the bonus pushes annual income across a band threshold, part of it is taxed at the higher marginal rate. That is progression, not a penalty:
An employee projecting Rs 3,100,000 receives a Rs 300,000 bonus, taking them to Rs 3,400,000 — across the Rs 3,200,000 threshold into the 25% band. Tax on the bonus is 20% on the first Rs 100,000 and 25% on the remaining Rs 200,000, so Rs 70,000 rather than a flat Rs 60,000 or Rs 75,000. Crossing a threshold never reduces net pay; it raises the rate only on the portion above it — marginal versus effective rates.
Bonuses that are not cash
Incentives increasingly arrive in forms payroll systems handle badly, and each has its own treatment:
| Form | What to establish |
|---|---|
| Cash bonus or commission | Straightforward — add to the annual projection and re-spread |
| Retention or joining bonus with a clawback | When it becomes taxable, and what happens if it is later repaid |
| Gift, voucher or non-cash award | Whether it is a taxable perquisite and at what value |
| Share-based award | The valuation basis and the point at which the charge arises — timing is often the larger question |
| Bonus paid after year end for a prior year | Which tax year it belongs to, which determines the slab table applied |
The last row causes real disputes. A bonus declared for a year that ended in June but paid in September may fall into a different tax year from the performance it rewards, computed on a different slab table. Establish the position before the payroll run rather than reversing it afterwards.
For employers
- Never apply a flat percentage. It over-deducts or under-deducts every time, and the reconciliation gap surfaces at year end.
- Reproject before the payroll run, not after, so the correct figure appears on the same payslip as the bonus.
- Retain the working per employee — annual projection, tax computed, deducted to date, balance spread. This is what a withholding audit examines.
- Tell people in advance. A one-line explanation with the bonus letter prevents most of the queries.
- Consider timing at the design stage. Where bonuses are discretionary, awarding earlier in the tax year smooths the deduction profile.
For employees
- Compare your year-to-date deduction against the fraction of the year elapsed, not one month against another.
- Ask for the reprojection working if the figure looks wrong — you are entitled to understand the computation.
- Check that benefits and allowances were valued, since an unvalued benefit shifts the whole projection.
- Keep the bonus letter and the payslips with your tax year records — document checklist.
Sources
This guide is written against the official and clearly labelled professional references below. Rates, thresholds and portal procedures change between reviews, so open the primary source before relying on a figure.
Questions people also ask
Is a bonus taxed at a higher rate than salary?
No. There is no separate bonus rate. The bonus is added to annual taxable salary and the same progressive slabs apply. What can happen is that the additional amount pushes part of your income into a higher band, so the tax on the bonus itself is charged at your marginal rate — which feels like a penalty but is just how progression works.
Why was so much deducted the month after my bonus?
Because the annual projection reset and the additional liability was spread over fewer remaining months. A bonus received in month ten leaves only three months to collect the extra tax, so the monthly deduction rises sharply. Received in month two, the same bonus would barely move the monthly figure.
Can I ask for the bonus tax to be spread over next year?
No. The bonus is taxable in the tax year in which it is paid or becomes due, and the withholding has to be collected within that year. What can sometimes be negotiated commercially is the timing of the bonus payment itself, which is a different question and one to raise before the award rather than after.
Does a bonus paid in June get taxed differently from one paid in July?
They fall in different tax years, so yes — and the difference can be material. A June payment belongs to the year ending 30 June and is computed on that year slabs with whatever else you earned in it. A July payment starts the new year projection. If you have any influence over timing, it is worth modelling both.
My employer deducted a flat 20 percent on my bonus. Is that right?
It is a common shortcut and it is wrong. There is no flat bonus rate, and a guessed percentage will over-deduct or under-deduct depending on where your annual income sits in the slab table. Ask for the reprojection working — the annual figure, the tax computed on it, the tax already deducted, and the balance spread across remaining months.
Send the tax year and the transaction or filing involved, and we will tell you what is actually required.
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