TDS on Salary 2026: How Monthly TDS Is Calculated from CTC

How salary TDS is estimated

Salary TDS is not a fixed percentage of CTC. Payroll estimates taxable salary for the year, applies the relevant tax regime/rates, reduces eligible credits/relief, then deducts tax over the remaining pay periods. If a bonus, declaration or previous-employer salary changes the annual estimate, monthly TDS can rise or fall later in the year.

Before comparing TDS with final tax

How employers spread annual tax across the year

• CTC is not the tax base.
• Payroll works from estimated annual taxable salary.
• TDS can be rebalanced through the year.
• Bonus and job changes are common reasons for sudden TDS jumps.

From CTC to TDS in four steps

• Remove employer-side CTC items that are not taxable cash salary in the same way.
• Compute salary income and permitted exemptions/deductions for the chosen regime.
• Apply the annual slab rates, rebate/marginal relief and cess as applicable.
• Subtract tax already deducted and spread the remaining amount across future salary payments.

Illustrative annual calculation

If gross taxable salary before standard deduction is ₹18 lakh and the ₹75,000 salary standard deduction applies, taxable salary is ₹17.25 lakh before considering other items. Under the current new-regime slabs, calculate the annual tax, then divide/rebalance across months. The monthly number is therefore a collection schedule, not a separate monthly tax law.

Why TDS jumps after a bonus

A ₹2 lakh bonus raises estimated annual taxable salary. Payroll may have only a few months left to recover the additional annual tax, so the per-month TDS increase can be sharp. The same can happen after you disclose salary from a previous employer late in the year.

Reconcile at year-end

Compare Form 16/TDS statements with payslips and the e-filing portal’s tax information. If excess tax was deducted, the return can determine a refund; if insufficient tax was deducted because of other income, additional tax may be payable.

Read monthly TDS as a moving annual estimate

Salary TDS is an annual estimate that payroll revisits during the year, not a fixed percentage permanently attached to each payslip. The employer projects taxable salary, applies the selected regime and permitted declarations, computes the estimated annual tax and then adjusts deductions across the remaining salary payments.

That is why TDS can jump after a bonus, a late investment declaration, a mid-year joining or disclosure of previous-employer income. To check whether the deduction is reasonable, compare cumulative taxable salary and cumulative TDS with the employer’s latest annual projection; a single month viewed in isolation can be misleading even when the year-to-date calculation is correct.

At year-end, reconcile Form 16, AIS/26AS and payslips. If the final tax is higher than TDS, the balance still has to be paid through the return mechanism.

If you change jobs, give the new employer the prescribed previous-employment information where appropriate. Otherwise both employers can apply slab assumptions independently and the combined TDS may be too low. Also remember that salary payroll normally does not know about every bank interest, capital gain or rental item unless you disclose it under the applicable process.

To audit the deduction, reconstruct the year: start with taxable salary components, subtract the standard deduction and other permitted items under the selected regime, apply the current slab rates, add cess and then reduce tax already deducted. The remaining tax is spread over the remaining payroll months. That method explains why dividing annual tax by 12 from the start of the year is only an approximation.

Section 192 works on estimated annual taxable salary, so payroll is allowed to adjust deductions during the year as the estimate changes. A bonus, arrears, revised declaration, previous-employer salary or a change in tax regime can therefore cause a sudden jump or fall in TDS without any error in the payroll software.

Why monthly TDS can change even when salary does not

Employers estimate annual taxable salary and spread the expected tax across the remaining payroll months. A bonus, revised declaration, previous-employer income or proof rejection can therefore change TDS later in the year without changing base salary. Reconcile the year-to-date deduction with the revised annual estimate instead of expecting twelve identical TDS entries.

Bonus and job-change months can shift the deduction sharply

Payroll TDS can change after a bonus, salary revision, job change or declaration update because the employer estimates annual tax and adjusts deductions across the remaining months. One unusually high TDS month is therefore not automatically an error.

Salary-TDS reconciliation mistakes

• Mixing tax years or assessment years.
• Treating TDS as the final tax liability.
• Using gross CTC where a statutory formula requires a different salary/wage definition.
• Assuming an exemption or deduction is available under every tax regime.
• Ignoring state-specific payroll rules such as professional tax.

When a revised annual tax estimate appears in the middle of the year, divide the tax still unpaid by the number of salary months left. That gives a quick reasonableness check for the new monthly TDS. It will not exactly reproduce every payroll rounding rule, but it should be close enough to flag a major mismatch that needs clarification from payroll.

Use the remaining-month test

When payroll updates an input, divide the revised annual tax still payable by the number of salary months remaining. That simple check explains many sudden increases or decreases in monthly TDS. It also helps identify obvious payroll errors before the final months of the tax year leave little time for correction.

Recalculate annual tax, then divide across remaining months

Frequently asked questions