TDS on Salary: How It's Calculated & Deducted (India 2026)

Every salaried person in India has seen the line: gross pay in one column, a chunk labelled TDS taken out, and a smaller net figure landing in the bank. TDS on salary is the mechanism by which the government collects income tax as you earn rather than in a single annual bill. It feels automatic and slightly mysterious, but the logic behind it is straightforward once you see how the employer thinks. This guide explains what TDS on salary is, how it is calculated, why it changes through the year, and what happens when the amount deducted turns out to be wrong.

What TDS on salary means

TDS stands for Tax Deducted at Source. On salary, it means your employer deducts income tax from your pay before handing you the rest, and deposits that tax with the government against your PAN. This is required under Section 192 of the Income-tax Act, which places the duty of deducting tax on the person paying the salary. The idea is simple: rather than expecting individuals to save up and pay a large tax bill once a year, the tax is collected in instalments, month by month, as income accrues.

One feature makes salary TDS different from TDS on other payments: it is not a flat percentage. Interest or contractor payments are usually taxed at a fixed rate, but salary TDS is based on your actual expected tax for the year, computed using the income tax slabs. That is why the calculation is more involved.

How the employer calculates it

The employer's goal is that, by the end of the financial year, the total tax deducted from your salary equals the actual tax you owe on that salary. To get there, payroll runs an estimate at the start of the year and keeps refining it. The steps look like this:

1. Project your annual salary. The employer estimates your total taxable salary for the full year — basic pay, allowances, bonuses and other components — based on what they expect to pay you.
2. Subtract exemptions and deductions. Eligible exemptions, the standard deduction and any deductions you are entitled to claim are removed to arrive at your estimated taxable income.
3. Apply the slab rates. The applicable income tax slab rates are applied to that taxable income to compute your expected tax for the year, including any applicable cess.
4. Spread it across the months. That annual tax figure is divided across the remaining pay periods, so each month a roughly equal slice is deducted as TDS.

Because it is an estimate, the employer recomputes it periodically. As the year unfolds and real numbers replace projections, the monthly TDS is nudged up or down to keep the yearly total on target.

The role of investment declarations

At the start of the year, employers usually ask you to submit an investment or deduction declaration — a statement of what you intend to claim, such as eligible investments, insurance premiums, housing loan interest or other deductions. This declaration directly lowers your estimated taxable income, which lowers your monthly TDS.

There is a catch that catches many people out. A declaration is only a promise. Towards the end of the year the employer typically asks for proof that you actually made those investments. If you declared a deduction but never made the investment, the employer removes it from the calculation, your taxable income rises, and the shortfall in tax is recovered by increasing the TDS in the final months. That is why some people see a sudden jump in their deduction in the last quarter of the year.

Old regime versus new regime

The tax regime you choose has a direct and significant effect on your salary TDS, so it is worth understanding at a high level. You tell your employer at the start of the year which regime to apply for TDS purposes.

1. The old regime generally lets you claim a wide range of deductions and exemptions — the kind you list in your investment declaration. If you invest and declare, your taxable income falls and your TDS is lower, but you have to substantiate those claims.
2. The new regime generally offers different slab rates but removes most of those deductions and exemptions. There is far less to declare, so the calculation is simpler, but you cannot reduce your taxable income through investments in the same way.

Neither is universally better — the right choice depends on how much you can genuinely claim as deductions. What matters for TDS is that the regime you elect determines both the slab rates and the deductions the employer applies, and therefore how much is taken from each payslip. Choose deliberately, because it shapes your take-home pay all year.

What if too much or too little is deducted?

Even with careful estimation, the year-end tax rarely matches the deducted total to the rupee. The income tax return is where it all gets reconciled.

1. If too much was deducted — perhaps because you made investments the employer did not account for, or had deductions from other sources — the excess is refunded to you after you file your return.
2. If too little was deducted — perhaps a declared investment never happened, or you had additional income the employer did not know about — you pay the shortfall as self-assessment tax when you file, potentially with some interest.

This is the reassuring part: TDS does not have to be perfect during the year, because filing your return trues everything up. TDS is a collection mechanism, not the final word on your tax.

How this connects to Form 16

Everything deducted under Section 192 across the year is exactly what your employer certifies in your Form 16 — the salary TDS certificate. Part A of that certificate shows the tax deducted and deposited quarter by quarter, and Part B shows the salary and deductions used to compute it. When you file your return, you claim credit for all that deducted tax, so you only pay any remaining balance or receive any refund. To understand the certificate itself, read our full guide on Form 16 and how to read it. Alongside income tax, most payslips also carry professional tax, a separate state-level deduction worth understanding.

A worked example of the thinking

Numbers aside, it helps to see the logic play out. Imagine an employee whose full-year salary is projected in April. Payroll subtracts the standard deduction and the investments the employee has declared, applies the slab rates for the regime the employee chose, and lands on an expected annual tax. Divide that by twelve, and you have the monthly TDS for now.

In October the employee receives a performance bonus that was not in the original projection. Payroll adds it to the estimated annual income, recomputes the tax, finds it is higher, and raises the TDS across the remaining months so the year still balances. In January the employee submits proof for the investments declared back in April — but one planned investment was never made. Payroll removes that deduction, the taxable income rises again, and the final months carry a larger deduction to make up the gap. None of this needs the employee to do arithmetic; it is the same estimate being refined as facts replace assumptions.

The lesson is practical: declare accurately, invest what you said you would, and report other income to your employer if you want your TDS to track your real liability. Do that, and the year-end reconciliation on your return becomes a formality rather than a surprise bill.

In summary

TDS on salary is your employer collecting your income tax in monthly instalments under Section 192, based on a running estimate of your full-year tax. That estimate depends on your projected income, your investment declarations, and the tax regime you elect, and it is refined through the year. If the deductions overshoot you get a refund; if they fall short you pay the balance when you file. And all of it is summarised in the Form 16 you use to file your return. Understand the mechanism, declare early and accurately, and TDS stops being a mystery on your payslip.