Marginal or effective? The rate confusion that costs decisions
Two numbers get called "your tax rate" and they are rarely the same. One is useful for decisions and the other is useful for understanding. Mixing them up leads people to decline overtime, delay a raise, or structure something badly to avoid a rate they were never going to pay on their whole income.
The two rates
| Marginal rate | Effective rate | |
|---|---|---|
| What it is | The rate applied to the next rupee you earn | Total tax divided by total income |
| Where it comes from | The band your income currently sits in | A calculation across all bands |
| Use it for | Incremental decisions — extra work, a bonus, a side project | Understanding your overall burden; comparing years |
| At Rs 3,600,000 salary | 25% | 11.56% |
Effective rate at every salary level
Computed on the Tax Year 2027 salary slabs. Note how far apart the two columns stay even at high incomes.
| Annual taxable salary | Annual tax | Marginal rate | Effective rate |
|---|---|---|---|
| Rs 600,000 | Rs 0 | 0% | 0.00% |
| Rs 1,200,000 | Rs 6,000 | 1% | 0.50% |
| Rs 1,800,000 | Rs 72,000 | 11% | 4.00% |
| Rs 2,400,000 | Rs 156,000 | 20% | 6.50% |
| Rs 3,000,000 | Rs 276,000 | 20% | 9.20% |
| Rs 3,600,000 | Rs 416,000 | 25% | 11.56% |
| Rs 4,800,000 | Rs 744,000 | 29% | 15.50% |
| Rs 6,000,000 | Rs 1,104,000 | 32% | 18.40% |
| Rs 9,000,000 | Rs 2,124,000 | 35% | 23.60% |
| Rs 15,000,000 | Rs 4,224,000 | 35% | 28.16% |
Even at Rs 15 million — well inside the top band — the effective rate is 28.16%, not 35%. The effective rate approaches the top marginal rate only asymptotically, and never reaches it.
You draw a salary, tax is deducted at source every month, and you want the return filed properly without spending a weekend inside IRIS.
Why the gap exists
Progression means each band rate touches only the income within that band. Breaking down Rs 3,600,000:
| Slice of income | Rate | Tax |
|---|---|---|
| First Rs 600,000 | 0% | Rs 0 |
| Next Rs 600,000 | 1% | Rs 6,000 |
| Next Rs 1,000,000 | 11% | Rs 110,000 |
| Next Rs 1,000,000 | 20% | Rs 200,000 |
| Final Rs 400,000 | 25% | Rs 100,000 |
| Total | Blended 11.56% | Rs 416,000 |
Using the right rate for the decision
- Evaluating extra income — freelance work, overtime, a second engagement. Use the marginal rate. At 25%, Rs 100,000 of extra work nets Rs 75,000.
- Negotiating a raise. Use the marginal rate to work out the net effect, and remember that crossing a threshold does not reprice the salary below it.
- Comparing job offers with different structures. Compare net of tax, and value benefits at their taxable amount rather than their cost to the employer.
- Assessing your overall burden or comparing this year to last. Use the effective rate.
- Deciding between salary and business income for the same work. Compare effective rates across the two schedules, because they differ substantially.
Where the two schedules diverge
The salary and business schedules are not variations on a theme. On Rs 3,600,000:
- As salary: Rs 416,000, an effective 11.56%.
- As business income of an individual: Rs 650,000 + 40% × Rs 400,000 = Rs 810,000, an effective 22.5%.
The same money, nearly double the tax. This is one reason the classification of income matters as much as the amount — see how each structure is taxed.
Decisions people get wrong because of this confusion
- Declining extra work in the belief that a higher band applies to all income. At a 25% marginal rate, Rs 100,000 of additional work still leaves Rs 75,000.
- Asking for a raise to be deferred to avoid crossing a threshold. Crossing never reduces net pay, and deferring simply postpones the income.
- Splitting income across family members without a genuine ownership or employment basis, to keep each below a band. Unsupported splitting is an enquiry trigger rather than a plan.
- Comparing a gross salary against a gross freelance rate without noticing that the two sit on different schedules with very different effective rates.
- Quoting a marginal rate as the tax cost in a business case, which overstates it and can kill a viable project.
The correction in each case is the same: use the marginal rate for the next rupee, the effective rate for the whole picture, and never the band percentage as a description of what you pay.
What a simple effective rate misses
For a business owner, income tax on taxable income is only part of the burden. A fuller picture includes:
- Non-recoverable withholding — minimum and final deductions that never become credits — the rate card.
- Minimum tax on turnover where it exceeds regular tax, which can produce an effective rate far above the slab computation.
- The section 4AB surcharge at 10% of tax computed for business individuals and AOPs above Rs 10 million of taxable income.
- Unrecovered input tax where supplies are exempt or reduced-rate.
Total tax borne against total income is the honest measure for a business. For a salaried taxpayer with no other income, the slab computation is close enough.
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
If I get a raise into a higher band, could I end up with less money?
No. Pakistan progressive system taxes only the slice of income above each threshold at that band rate, so crossing a boundary never reduces net pay. An extra rupee above the top threshold costs 35 paisa in tax, leaving 65 paisa. The fear of losing money by earning more comes from imagining the higher rate applies to your whole income, which it does not.
Which rate should I use to decide whether extra work is worth it?
The marginal rate, because it is what applies to the additional income. If your marginal rate is 25%, a Rs 100,000 project nets you Rs 75,000 before other costs. Use the effective rate for understanding your overall burden and for comparing years, not for evaluating an incremental decision.
Why is my effective rate so much lower than my slab percentage?
Because the income below each threshold was taxed at the lower rates on the way up. At Rs 3,600,000 the first Rs 600,000 is untaxed, the next Rs 600,000 is taxed at 1%, the next Rs 1,000,000 at 11%, and only the top Rs 400,000 at 25%. Blend those together and the effective rate is 11.56%.
Do business income and salary have the same effective rate?
No, and the difference is large. The business schedule for individuals and AOPs is much steeper — 15% starts immediately above Rs 600,000 where salary starts at 1%, and it reaches 45% above Rs 5,600,000. The same income earned as business profit rather than salary produces a substantially higher effective rate.
Does the effective rate include withholding I cannot reclaim?
A simple effective rate calculation on income tax alone will not capture it. Where you suffer minimum or final withholding that is not recoverable, your true burden is higher than the slab computation suggests. For a business owner the more useful measure is total tax borne against total income, including non-recoverable withholding and minimum tax.
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