TDS on Salary Under Section 192: How Your Employer Actually Calculates It

Salary is the one kind of income where TDS doesn't behave like it does everywhere else. A bank deducts a flat 10% on fixed deposit interest, a client deducts a flat rate on a professional fee, but an employer isn't allowed to just pick one number and apply it to your paycheck all year. The law instead requires them to estimate what you'll actually owe for the full year and spread that figure evenly across your remaining salary payments. This mechanism now sits in Section 392 of the Income Tax Act, 2025 (the section that carries forward what used to be Section 192), and understanding it explains why your take-home pay can shift through the year even when your gross salary doesn't move, and why a late investment declaration or a mid-year job change can suddenly change your monthly deduction.

How the Average Rate Method Actually Works

At the start of the tax year, or as soon as you join, your employer works out a reasonable estimate of your total salary for the full year: basic pay, allowances, any bonus that's already known, and taxable perquisites, minus exemptions such as the HRA exemption and the standard deduction. They apply the slab rates for whichever regime you're under to that estimate, add applicable cess, subtract any rebate you qualify for, and arrive at a projected annual tax figure. That figure is then divided across the number of salary payments remaining in the year to fix a monthly deduction, an approach usually called the average rate method, because the rate applied to each month's pay is the average of what your full year's income is expected to attract, not a flat slab rate applied month by month. Because it's built on an estimate, it isn't static: a mid-year increment, an announced bonus, a missed declaration, or a change in your regime choice all feed back into the calculation and change what gets deducted from the months that follow. Here is a simplified illustration for someone earning Rs 1,50,000 a month under the new regime, which applies by default unless you opt out of it:

Your Regime Choice and Investment Declarations Change the Estimate

The new tax regime under Section 202 (formerly Section 115BAC) is the default your employer applies unless you tell them otherwise, usually through a simple declaration at the start of the year or when you join. Opt for the old regime instead, and you're expected to back that choice with a declaration of your planned deductions, commonly still submitted on what's known as Form 12BB: your 80C-style investments, home loan interest, HRA rent details, health insurance premium, and so on. Your employer factors these in provisionally while computing the monthly estimate, which is why choosing the old regime with a full set of declared deductions usually means a smaller deduction from month one, well before you've actually made the investments. That provisional acceptance comes with a catch: employers are required to collect actual proof before the year closes, typically in a window around January and February, and if the proof doesn't match what you declared, or doesn't arrive at all, the shortfall gets clawed back through a higher deduction in your remaining pay cycles rather than spread out gently. None of this permanently locks you in either. If you're a salaried individual with no business or professional income, you're generally free to pick a different regime when you actually file your return, regardless of what you told your employer for TDS purposes, though doing so may mean reconciling a refund or an additional payment at that point.

Changing Jobs Mid-Year: The Multiple Employer Problem

Switch jobs partway through the year and each employer, left to their own devices, calculates your TDS as if they were the only one paying you: applying the full basic exemption, the full slab benefit, and the full standard deduction independently to whatever they alone pay you. Do that across two or three employers in the same year, and the combined deduction can fall well short of what you actually owe on your total income, since the benefit of the lower slabs and exemptions effectively gets applied more than once. The fix is for you to hand your new employer a statement of what you earned and what was already deducted at your previous job, commonly furnished on Form 12B, so they can compute the remaining months' TDS against your full-year income rather than a partial figure. Employers aren't required to accept this information, though most do since it usually works in the employee's favour by smoothing deductions across the year, but even if a shortfall does slip through, it isn't lost: it simply surfaces as tax payable when you file your return, since Form 26AS will show every employer's TDS credited separately against your PAN regardless of what either employer knew about the other.

Reporting Other TDS or TCS: Form 12BAA

Salary isn't always the only place tax gets deducted or collected on your behalf during the year. If a bank has deducted TDS on your fixed deposit interest, or you've paid TCS on an overseas remittance or a foreign trip package, that amount is real tax already paid, but your employer has no way of knowing about it unless you tell them. A form introduced specifically for this purpose, commonly referred to as Form 12BAA, lets you report exactly that: other TDS deducted and TCS collected elsewhere during the year, along with any income or loss from house property you want factored in. Once you submit it, your employer is required to account for those amounts while computing the remaining months' salary TDS, which usually means a smaller deduction from your pay rather than a larger refund you'd otherwise wait months to receive after filing. It's a small piece of paperwork that mostly benefits people who travel abroad often, hold multiple fixed deposits, or have a side stream of income that already attracts TDS at source.

None of this needs to be tracked to the rupee by the employee. What actually matters is submitting your regime choice and investment declarations on time, keeping proof ready for the January-February verification window, informing a new employer about a previous one when you switch jobs, and reporting other TDS or TCS you already know about instead of just waiting on a refund. Get those four habits right, and the average rate method does the rest of the work quietly, month after month, with only a small true-up left for you to check when Form 16, now Form 130, lands in your inbox.