Computing business income tax in Pakistan
Business income tax calculators are widely used and widely misapplied, because they compute the last step of a process where all the difficulty sits in the earlier ones. The slab arithmetic is the easy part.
The Tax Year 2027 business schedule
Applies to business individuals and associations of persons. The Finance Act 2026 did not revise these rates.
| Annual taxable income | Tax | Total at top of band |
|---|---|---|
| Up to Rs 600,000 | Nil | Rs 0 |
| Rs 600,001 – 1,200,000 | 15% of the amount over Rs 600,000 | Rs 90,000 |
| Rs 1,200,001 – 1,600,000 | Rs 90,000 + 20% over Rs 1,200,000 | Rs 170,000 |
| Rs 1,600,001 – 3,200,000 | Rs 170,000 + 30% over Rs 1,600,000 | Rs 650,000 |
| Rs 3,200,001 – 5,600,000 | Rs 650,000 + 40% over Rs 3,200,000 | Rs 1,610,000 |
| Above Rs 5,600,000 | Rs 1,610,000 + 45% over Rs 5,600,000 | No ceiling |
The section 4AB surcharge
Where taxable income exceeds Rs 10 million, a surcharge of 10% of the income tax computed applies to business individuals and associations of persons.
This is the point most widely misreported. The Finance Act 2026 withdrew the surcharge in respect of income chargeable under the head Salary — removing the 9% charge on high salaried income. It did not abolish section 4AB across the board. A business taxpayer above Rs 10 million who relies on a summary saying the surcharge was abolished will under-provide.
| Taxable income | Slab tax | Surcharge at 10% | Total |
|---|---|---|---|
| Rs 12,000,000 | Rs 4,490,000 | Rs 449,000 | Rs 4,939,000 |
| Rs 20,000,000 | Rs 8,090,000 | Rs 809,000 | Rs 8,899,000 |
You draw a salary, tax is deducted at source every month, and you want the return filed properly without spending a weekend inside IRIS.
Getting to taxable income
The slabs apply to taxable income, not to revenue or to accounting profit. The adjustments that matter:
- Tax depreciation and initial allowance follow the statutory rates rather than your accounting policy, so the two diverge from year one.
- Inadmissible expenses are added back — including expenditure lacking proper documentation, and payments where required withholding was not deducted and deposited.
- Provisions and accruals are frequently not deductible until incurred or paid.
- Carried-forward losses, subject to the set-off rules for the head.
- Personal expenditure routed through the business, which is not deductible and also breaks the wealth statement.
When minimum tax overrides everything
Section 113 applies a minimum tax where the regular computation falls below 1.25% of gross turnover — and it applies whether you made a profit or a loss.
For low-margin businesses this is the normal position rather than an edge case, which means any calculator returning a slab figure alone is answering the wrong question.
Advance tax instalments, which the calculator will not remind you about
Business taxpayers are frequently required to pay tax quarterly in advance rather than settling once at filing, and this is among the most commonly missed obligations because nothing prompts it. Two consequences:
- Default surcharge accrues on underpaid instalments, so a taxpayer who computes correctly at year end but paid nothing during it still has a cost.
- Instalments should anticipate the whole position, including minimum tax and the section 4AB surcharge — not just projected slab tax on projected profit.
Where your circumstances changed materially — a business wound down, a large one-off gain in the prior year, a super tax position that no longer applies — instalments calculated on the prior-year liability may substantially overfund the position, tying up cash recoverable only through the return. Review them rather than paying whatever was computed last year.
What a calculator omits
- The adjustment from accounting profit to taxable income — where most of the work is.
- Minimum tax on turnover, which can exceed the whole result.
- The section 4AB surcharge above Rs 10 million.
- Other heads of income — property, capital gains, other sources — multi-head computation.
- Tax credits, which reduce the tax rather than the income.
- Withholding already suffered, and whether each deduction is adjustable, minimum or final.
- Advance tax instalments already paid.
Use a calculator to sanity-check the slab arithmetic, then build the actual computation around it — and if you are near Rs 10 million or on thin margins, model the surcharge and minimum tax before setting your instalments.
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
Why is business tax so much higher than salary tax on the same income?
Because they run on different schedules by design. Salary starts at 1% above Rs 600,000; business income starts at 15% at the same threshold. On Rs 3,600,000 the difference is Rs 416,000 as salary against Rs 810,000 as business income. The classification of your income therefore matters as much as the amount.
Does the section 4AB surcharge still apply to me?
If you are a business individual or an association of persons with taxable income above Rs 10 million, yes — at 10% of the income tax computed. What changed for Tax Year 2027 is that the surcharge was withdrawn in respect of income chargeable under the head Salary. Summaries describing it as abolished outright are compressing that distinction, and a business taxpayer relying on them will under-provide.
Can minimum tax exceed my slab computation?
Routinely, for low-margin businesses. Minimum tax under section 113 applies where the regular tax computation falls below 1.25% of gross turnover, and it applies at a loss. A distributor with Rs 200 million of turnover and thin margins can find the minimum governs and the slab computation is irrelevant that year.
Are my business expenses deductible before the slabs apply?
Yes — the slabs apply to taxable income, which is accounting profit adjusted for tax depreciation, inadmissible expenses and provisions. That adjustment is where the real work sits. A calculator that asks for your income and returns a tax figure has assumed you already did it.
Do I pay this on top of withholding already deducted from my receipts?
Withholding is a payment on account where adjustable, so it is credited against the computed liability rather than added to it. Where the deduction is minimum or final, it interacts differently. Establish the character of each deduction before assuming it reduces your balance payable.
Send the tax year and the transaction or filing involved, and we will tell you what is actually required.
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