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How Income Tax Is Calculated (Brackets & Rates)

Tax · 7 min read · Last updated September 2026

How tax brackets actually work

A progressive system divides your taxable income into layers. Each layer is taxed at its own rate; the rates never apply to your whole income. A common myth is that a raise "pushes all your income into a higher bracket" — it doesn't. Only the slice of income above the threshold is taxed at the higher rate.

The general formula

Effective rate = Tax ÷ Taxable income. Marginal rate = the rate of your highest occupied bracket.

Step-by-step example (illustrative brackets)

Assume brackets of 0% up to 10,000 · 10% from 10,001–40,000 · 20% from 40,001–100,000 · 30% above 100,000, with taxable income of 72,000:

Even though the top bracket is 30%, none of this income reaches it.

Country examples with official calculators

• Pakistan: annual taxable slabs with progressive rates; salaried and non-salaried schedules differ. Try the Pakistan Income Tax Calculator.
• India: new vs old regime choice changes slabs and deductions. Try the India Income Tax Calculator.
• US: federal brackets plus state tax and standard vs itemized deductions. Try the US Income Tax Calculator.
• UK, Canada, Australia: country-specific tools with local rules — see the finance and regional categories.

Deductions people commonly miss

• Retirement/pension contributions that reduce taxable income
• Charitable donations eligible for credits or deductions
• Professional expenses allowed as employment deductions
• Family-related credits and rebates
• Withholding vs final liability — a refund is not free money, it's your own overpayment

India new-regime slabs, worked (FY 2025-26 / AY 2026-27)

India's default new-regime slabs for FY 2025-26, per the Income Tax Department's Budget 2025 announcement:

The Section 87A rebate makes this table friendlier than it looks: resident individuals with taxable income up to ₹12,00,000 pay zero tax, because the rebate (up to ₹60,000) wipes out the entire liability at that level. Salaried taxpayers also get a ₹75,000 standard deduction, which lifts the effective tax-free salary to about ₹12.75 lakh. Worked example — ₹16,00,000 salary:

New vs old regime is a genuine computation, not a preference: the old regime has lower exemption (₹2.5 lakh) and rates starting at 5% earlier, but allows deductions the new regime removes (80C investments, HRA, most others). Salaried filers run both with their actual deduction stack and keep the cheaper one — the India income tax calculator does this comparison. Rates above are as announced in Budget 2025; verify against the CBDT's current tables before filing.

Worked example: Pakistan Income Tax at its default inputs

Take the default setup on Pakistan Income Tax: no fields changed, nothing tuned to a nice round number. Run in the site's own engine, those values produce the answer below.

Default inputs

Input	Default
Annual Income (PKR)	2000000

Result: PKR 135,000

The steps behind that answer

1. Salaried slabs: up to 6L 0%, progressive to 35% above 4.1M
2. Tax ≈ PKR 135,000
3. Rough estimate — verify with FBR tables

Sensitivity: Annual Income (PKR) from half to one-and-a-half times

Hold every other field still and move only annual income (pkr).

Sensitivity: Annual Income (PKR) from half to one-and-a-half times

Annual Income (PKR)	Result
1,000,000	PKR 37,500
2,000,000	PKR 135,000
3,000,000	PKR 420,000

Halve annual income (pkr) and the result moves one way; add half again and it moves the other. Watching that gap is quicker than guessing which field matters most.

Related guides

• GST & Sales Tax Explained (Add, Remove, Reverse)
• Freelance Rates
• The Freelance Rate Card
• Business Days

Marginal rates apply to slices, not the whole income

Progressive brackets tax each slice of income at its own rate. Moving into a higher bracket raises the rate on the income above the threshold, not on everything below it, so a raise never reduces take-home pay.

The average rate is total tax divided by total income, and it is always lower than the marginal rate. Confusing the two is the most common reason people overestimate what a raise is worth.

Deductions and credits are not the same thing

A deduction reduces taxable income, so its value is the deduction times your marginal rate. A credit reduces the tax itself, so its value is the full amount. A 1,000 credit is worth more than a 1,000 deduction unless your marginal rate is 100%.

That difference explains why some reliefs are refundable and others are not, and why the order in which they apply can change the answer.

Withholding is an estimate, and rules are local

Employers withhold against an assumed annual income, so bonuses, second jobs and mid-year changes routinely produce a refund or a bill. The calculation here estimates the liability, not the amount your employer will deduct.

Brackets, surcharges, local levies and social contributions differ by country and often by region. Use the rates that apply to your own jurisdiction; a result computed on another country’s brackets is a demonstration, not advice.

FAQ

Why is my effective rate lower than my bracket rate?

Because lower brackets are filled first at their lower rates, the blended average across all brackets is always below your top marginal rate.

Are bonuses taxed at a higher rate?

No — withholding on bonuses may be higher in some countries, but the final tax is calculated on total annual income. The extra withheld usually comes back as a refund.

What is taxable income?

Gross income minus allowed deductions and exemptions. It is the base the brackets apply to, and it is usually smaller than your gross salary.

Is it worth contributing to retirement accounts for tax savings?

For many earners yes, because contributions reduce taxable income today; the trade-off is locking funds until retirement. Rules and limits vary by country and plan type.