Learning how to calculate income tax is simpler than it looks once you understand tax brackets. You do not pay one single rate on all of your income. Instead, your income is split across brackets, and each slice is taxed at a different rate. This guide explains the bracket method step by step, with worked examples for the United States and Pakistan, so you can check your own tax bill with confidence. You can also try our free tax calculator to check a result in seconds.
Table of Contents
- How to Calculate Income Tax Using the Bracket Method
- US 2025 Federal Income Tax Brackets for Single Filers
- Worked Example: US Tax on $260,000 of Taxable Income
- Pakistan Income Tax Slabs for FY 2026-27
- Worked Example: Pakistan Tax on Rs 5,000,000
- Marginal Rate vs Effective Rate: How to Calculate Income Tax
- Common Mistakes to Avoid When You Calculate Income Tax
- Frequently Asked Questions
How to Calculate Income Tax Using the Bracket Method
When you calculate income tax with the bracket method, follow these steps in order:
- Start with your gross income for the year.
- Subtract deductions and allowances that apply to you to arrive at taxable income.
- Find the tax bracket that covers each slice of that taxable income.
- Multiply each slice by its bracket rate and add the amounts together.
- Subtract any tax credits, if applicable, to arrive at the tax you owe.
The key idea is that only the income inside a bracket is taxed at that bracket’s rate. A higher income does not mean your whole income is suddenly taxed at the top rate.
The basic formula is:
Tax = (income in bracket 1 × rate 1) + (income in bracket 2 × rate 2) + and so on, for each bracket your income reaches.
US 2025 Federal Income Tax Brackets for Single Filers
The table below shows the US federal income tax brackets for single filers for 2025. These rates apply to taxable income, not to gross income, and they are the rates used in the worked example below. Keep this table to hand when you learn how to calculate income tax for a single filer.
| Tax rate | Single filer taxable income |
|---|---|
| 10% | Up to $11,925 |
| 12% | $11,926 to $48,475 |
| 22% | $48,476 to $103,350 |
| 24% | $103,351 to $197,300 |
| 32% | $197,301 to $250,525 |
| 35% | $250,526 to $626,350 |
| 37% | Over $626,350 |
Worked Example: US Tax on $60,000 of Taxable Income
Take a single filer with $60,000 of taxable income in 2025. Slice it: 10% on the first $11,925 is $1,192.50; 12% on the next $36,550 (up to $48,475) is $4,386.00; 22% on the remaining $11,525 is $2,535.50. Total: $1,192.50 + $4,386.00 + $2,535.50 = $8,114.00. The marginal rate is 22% and the effective rate on taxable income is 13.5%. Note what the answer is not: it is not 22% of $60,000, which would be $13,200. That flat-rate shortcut overstates the bill by more than $5,000 and is the most common first mistake.
Worked Example: US Tax on $260,000 of Taxable Income
Take a single filer with $260,000 of taxable income in 2025. Work through the brackets one slice at a time:
| Bracket | Income in bracket | Rate | Tax |
|---|---|---|---|
| 10% | $11,925 | 10% | $1,192.50 |
| 12% | $36,550 | 12% | $4,386.00 |
| 22% | $54,875 | 22% | $12,072.50 |
| 24% | $93,950 | 24% | $22,548.00 |
| 32% | $53,225 | 32% | $17,032.00 |
| 35% | $9,475 | 35% | $3,316.25 |
| Total | $260,000 | — | $60,547.25 |
The total federal tax is $60,547.25. The marginal rate is 35%, because the last $9,475 falls in the 35% bracket. The effective rate is 23.3%, calculated as $60,547.25 ÷ $260,000. That is the rate that actually applies to the income as a whole.
Pakistan Income Tax Slabs for FY 2026-27
Pakistan’s salaried income tax slabs for FY 2026-27, covering 1 July 2026 to 30 June 2027 under the Finance Act 2026, are set out below. The 9% salaried surcharge has been abolished. The figures are confirmed by the FBR FY 2026-27 rate card report. These slabs are the basis for how to calculate income tax on salary in Pakistan for FY 2026-27.
| Annual taxable income (Rs) | Tax |
|---|---|
| Up to 600,000 | Nil |
| 600,001 to 1,200,000 | 1% of the amount exceeding Rs 600,000 |
| 1,200,001 to 2,200,000 | Rs 6,000 plus 11% of the amount exceeding Rs 1,200,000 |
| 2,200,001 to 3,200,000 | Rs 116,000 plus 20% of the amount exceeding Rs 2,200,000 |
| 3,200,001 to 4,100,000 | Rs 316,000 plus 25% of the amount exceeding Rs 3,200,000 |
| 4,100,001 to 5,600,000 | Rs 541,000 plus 29% of the amount exceeding Rs 4,100,000 |
| 5,600,001 to 7,000,000 | Rs 976,000 plus 32% of the amount exceeding Rs 5,600,000 |
| Above 7,000,000 | Rs 1,424,000 plus 35% of the amount exceeding Rs 7,000,000 |
Worked Example: Pakistan Tax on Rs 5,000,000
For a salaried person with Rs 5,000,000 of annual taxable income in FY 2026-27, the income falls in the Rs 4,100,001 to Rs 5,600,000 slab. The tax is Rs 541,000 plus 29% of Rs 900,000 (Rs 5,000,000 minus Rs 4,100,000), which is Rs 261,000. Total tax is therefore Rs 802,000, an effective rate of 16.0% on Rs 5,000,000. This shows how to calculate income tax using a slab, rather than applying one rate to the whole salary. If your income is in another currency, use our currency converter to convert it before applying the slabs.
Marginal Rate vs Effective Rate: How to Calculate Income Tax
- Marginal rate: the rate on your next unit of income. For the US example above, it is 35%.
- Effective rate: your total tax divided by your taxable income. For the US example above, it is 23.3%.
- Your effective rate is almost always lower than your marginal rate, because the lower brackets are taxed at lower rates first.
More Pakistan Worked Examples (FY 2026-27)
Example A — PKR 1,800,000 a year, in the 1,200,001–2,200,000 slab: tax = 6,000 + 11% x (1,800,000 − 1,200,000) = 6,000 + 66,000 = PKR 72,000 a year, or PKR 6,000 a month. Effective rate 4.0%. Example B — PKR 3,000,000 a year, in the 2,200,001–3,200,000 slab at the new FY 2026-27 rate of 20% (not last year’s 23%): tax = 116,000 + 20% x (3,000,000 − 2,200,000) = 116,000 + 160,000 = PKR 276,000 a year, or PKR 23,000 a month. Effective rate 9.2%. At the old 23% rate this would have been PKR 300,000, a useful check if a payslip looks too heavy. Employers annualise monthly pay (monthly pay x 12), work out annual tax from the slab table, then divide by 12 for the monthly deduction.
Deductions Come First
All examples above start from taxable income, but in real life you start from gross income. Take a US single filer earning $75,750 gross in 2025: after the $15,750 standard deduction, taxable income is $75,750 − $15,750 = $60,000 — exactly the first US example, giving the same $8,114 of tax. Applying the brackets to the full $75,750 would overstate the bill by more than $3,000. The same order applies in Pakistan, where exempt allowances and items such as Zakat paid to approved institutions reduce taxable salary before the slab table is applied. The order never changes: deductions first, brackets second. When comparing job offers, compare after-tax income, not headline salary.
A Quicker Way — Spreadsheet and Annualised-Salary Methods
For a salaried employee, the annualised method is the fastest check: monthly gross salary x 12, minus annual deductions or exempt allowances, find your slab or bracket, apply the formula, divide annual tax by 12. That is the monthly deduction you should see on your payslip, give or take rounding and mid-year changes. For a spreadsheet, set up one row per bracket with its lower limit, upper limit and rate, then use a formula that taxes only the part of your income inside each row and sums the results. Change one cell — your income — and the tax, marginal rate and effective rate update instantly, making “what if I earn $10,000 more?” easy to test.
Common Mistakes to Avoid When You Calculate Income Tax
- Applying the top rate to your whole income instead of only to the slice inside that bracket.
- Using gross income instead of taxable income after deductions and allowances.
- Using last year’s brackets or slabs for the current tax year.
- Forgetting credits, withholding already paid, or the abolition of the 9% salaried surcharge in Pakistan for FY 2026-27.
- Mixing up monthly and annual income when you apply annual slabs.
- Using last year’s slabs: Pakistan’s FY 2026-27 slabs and the abolished salaried surcharge are a live example — an old table gives a wrong answer with total confidence.
- Confusing the tax year with the calendar year: in Pakistan the fiscal year runs July to June; in the US the tax year is the calendar year.
- Ignoring credits and other income: the bracket calculation gives tax before credits, so treat it as an estimate, not a filing.
For monthly repayments on a loan, see our guide to loan EMI. It uses the same careful, step-by-step approach, but for loan payments rather than tax.
Frequently Asked Questions
What is the formula to calculate income tax?
Find your taxable income, split it across the tax brackets that apply to you, multiply each slice by its bracket rate, and add the results together. Then subtract any tax credits that apply.
Do I pay my top tax rate on all of my income?
No. Only the income that falls inside your top bracket is taxed at that rate. The income below it is taxed at the lower bracket rates first.
What is the difference between marginal and effective tax rate?
Your marginal rate is the rate on your next unit of income, while your effective rate is your total tax divided by your taxable income. The effective rate is usually lower than the marginal rate.
How do I calculate income tax in Pakistan for FY 2026-27?
Use the FY 2026-27 salaried slabs, which run from 1 July 2026 to 30 June 2027. For example, income from Rs 2.2 million to Rs 3.2 million is taxed at Rs 116,000 plus 20% of the amount above Rs 2.2 million, and income above Rs 7 million is taxed at Rs 1,424,000 plus 35% of the amount above Rs 7 million. The 9% salaried surcharge has been abolished.
What are the US 2025 single-filer tax brackets?
For single filers in 2025, the federal rates are 10% up to $11,925, 12% to $48,475, 22% to $103,350, 24% to $197,300, 32% to $250,525, 35% to $626,350, and 37% above $626,350.
How can I check my income tax calculation quickly?
Work through the brackets as shown in the examples above, or use a tax calculator and enter your taxable income, filing status, and country. Always double-check that you are using the brackets for the correct tax year.
Now that you know how to calculate income tax, try the bracket method on your own income, check it with a calculator, and keep the correct brackets for your tax year to hand.
This guide is for education only and is not tax advice. Tax law changes frequently; confirm the current brackets, slabs, deductions and surcharge rules with the Internal Revenue Service or the Federal Board of Revenue, or with a qualified tax adviser, before filing.