Basics
How taxable income is calculated
6 min read · Last updated 1 November 2026 · Tax Globy editorial team
A salary slip and a tax return do not start from the same number. Gross salary is what the employer pays; taxable income is what the tax system charges. The steps between them, and their order, explain why the tax on a headline salary is often lower than a first guess.
Gross salary and taxable income
Gross salary is the total agreed with the employer before any deduction. Taxable income is the part that the law actually charges, after the contributions, allowances and deductions it recognises.
The two figures can be far apart. A salary can be reduced by pension contributions, social insurance, a standard deduction or a personal allowance before any rate is applied. Comparing a gross figure with a tax bill is therefore a comparison of two different things.
Standard deductions and allowances
Several systems grant a flat amount that needs no receipts or evidence. The table lists the 2026-27 figures used in this calculator.
A flat amount is worth most to the people it fully covers, and it is worth the same in cash terms at every income level within a band. That is different from a credit, which is discussed below.
| Country | Deduction or allowance |
|---|---|
| India, new regime | INR 75,000 |
| India, old regime | INR 50,000 |
| United States, single | USD 16,100 |
| China | CNY 60,000 |
| United Kingdom | GBP 12,570 |
| Pakistan, salaried income | No general standard deduction in this model |
Run your own numbers
The calculator applies the rates described in this guide and shows the band-by-band breakdown.
Open the all five calculators calculatorPre-tax contributions
Some payments leave the salary before tax is calculated, so they reduce both the tax and the cash received. A US 401(k) contribution, a UK pension made by salary sacrifice and Chinese social insurance and housing fund contributions all work this way.
Because a pre-tax contribution reduces taxable income, its tax value depends on the marginal rate. The same contribution saves more tax at a higher rate, and the saving is smaller than the contribution itself in every band below 100%.
The order of the calculation
The usual order is gross income, then pre-tax contributions, then the standard deduction or allowance, then the bands, then credits and rebates. Each step changes the number that the next step works on.
Order explains results that look odd. Two people can contribute the same amount and receive different tax savings, because one contribution comes off before the bands and the other arrives as a credit at the end.
Deductions and credits are not interchangeable
A deduction reduces taxable income, so its value is the amount deducted multiplied by the marginal rate. A credit or rebate reduces the tax bill itself, so its value is normally the full amount of the credit.
A deduction of 10,000 in a 20% band saves about 2,000 of tax. A credit of 10,000 saves 10,000, provided there is enough tax to absorb it. The two are often discussed in the same sentence, which is why the distinction is worth keeping in mind.
A deduction is worth its size times your marginal rate; a credit is worth its face value.
Pakistan and the exceptions
Not every system grants a flat deduction. In this model, Pakistan has no general standard deduction for salaried income, so taxable salary starts at the gross figure and the slabs apply directly to it.
That does not make the gross figure the final word. Zakat, tax credits, investment allowances and non-salary income sit outside the model, and each of them can change the final liability.
What to check on your own figures
Start from the gross figure your employer reports, then list every amount that comes off before tax and every relief you claim. A deduction missing from the list moves the estimate by that amount multiplied by your marginal rate.
Check the tax year as well, because thresholds and allowances change between years. A figure taken from an older year can look plausible and still be wrong.
- Pre-tax contributions such as a 401(k) or a pension
- The standard deduction or personal allowance for the year
- Credits and rebates claimed after the tax is calculated
- Any non-salary income included in the return
Common questions
Is taxable income the same as gross salary?
No. Gross salary is the starting figure; taxable income is what remains after pre-tax contributions, the standard deduction or allowance and other reliefs.
Which reduces more tax, a deduction or a credit?
A credit of the same size normally reduces more, because it comes off the bill directly rather than off taxable income.
Why does Pakistan show no standard deduction here?
This model applies the salaried slabs to the gross salary. Other reliefs such as credits and allowances exist but are not part of the estimate.
Do pre-tax contributions always save tax?
They reduce taxable income, so they save tax at your marginal rate. They also reduce the cash you receive, so the saving is smaller than the contribution.
Written and maintained by the Tax Globy editorial team
Tax Globy is an independent calculator project. Every rate, threshold and deduction is checked against the published official source listed on the page, and each page shows when it was last reviewed.
Last reviewed 1 November 2026 · Estimates only, not tax advice.
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