Changed jobs mid-year? Calculate exactly how much TDS your new employer still owes to deduct on your combined salary — free and instant.
Switched jobs this year? Your new employer needs to know what you already earned and what tax was already cut, or your TDS ends up wrong on both sides. The Form 12B Multiple Employer Salary TDS Calculator works out exactly how much your new employer still owes to deduct, so you don't get a shock notice next February.
This tool is built for salaried employees who changed jobs during the year and now need to give their new HR or payroll team a salary declaration. Form 12B is the name most people still search for, but from Tax Year 2026-27 it's officially Form No. 122 under the Income-tax Act, 2025. It's also useful for HR and payroll teams setting the correct TDS run for a lateral hire, and for CAs advising clients on job-change tax planning. Enter your previous salary, TDS already cut, and expected new salary, and it tells you the balance TDS your new employer needs to deduct for the rest of the year.
Aggregate Salary = Previous Employer Salary + New Employer Estimated Annual Salary
Taxable Income = Aggregate Salary − Standard Deduction − Other Deductions (old regime only)
Total Tax = Tax on Taxable Income (per applicable slab) + 4% Health & Education Cess
Balance TDS = Total Tax − TDS Already Deducted by Previous Employer
Monthly TDS = Balance TDS ÷ Months Remaining with New Employer
Form No. 122 lets you hand over your salary and TDS details from an earlier employer to your current one. It replaced Form 12B and Form 12BAA once the Income-tax Act, 2025 took effect on 1 April 2026. Section 392(4)(a) of that Act puts the responsibility on your chosen employer to deduct TDS on your combined salary for the year, not just what they're paying you. Section 392(1) governs how that TDS gets calculated month to month.
Priya worked at her old company from April to August, earning ₹6,00,000, and they deducted ₹15,000 as TDS. She joined a new firm in September on a package that works out to ₹9,00,000 for the full year, with 7 months left in the FY. She's on the new tax regime and has no extra deductions to claim.
That's roughly what should show up as tax deducted on Priya's payslip each month from September onward.
Budget 2026 made no changes to the income tax slabs for Tax Year 2026-27. The new regime structure introduced in Budget 2025 continues as-is: ₹4 lakh nil-tax slab, ₹75,000 standard deduction, and a ₹60,000 rebate under Section 156 of the Income-tax Act, 2025 for taxable income up to ₹12 lakh. [VERIFY: the exact numeric slab table for Tax Year 2026-27 as notified under the Income-tax Act, 2025 or Finance Act 2026, checked directly against incometaxindia.gov.in rather than secondary sources.]
There's a detail most people miss: if your combined salary lands just above ₹12 lakh taxable (or ₹5 lakh under the old regime), you don't jump straight to full tax on the whole slab. Marginal relief caps your tax at the amount your income exceeds that threshold, whichever is lower. So if your taxable income is ₹12,00,500, you owe roughly ₹500 in tax, not the full slab calculation. This calculator applies that relief automatically; it's a common gap in DIY TDS math when combining two salaries pushes you just past the rebate ceiling.
Whether you moved jobs in April or December, the same slab math applies. Only the number of months your new employer has to recover TDS changes.
No, it's not legally compulsory. But skipping it means your new employer only sees your current salary, so your combined income gets taxed too lightly through the year. You'll likely owe a lump sum plus interest when you file your return. Submitting it is worth the five minutes it takes.
No. Section 392(4)(a) of the Income-tax Act, 2025 lets you choose only one employer to receive your combined salary and TDS details. That employer then deducts TDS on your total income from all sources of salary for the year, not the others.
You still fill in the form with the salary figure and enter zero for TDS deducted. Your new employer will factor in that full previous salary while computing tax on your aggregate income, so nothing gets missed.
Only in a limited way, through the deductions field you fill in yourself for the old regime. It doesn't calculate HRA exemption automatically. Run your numbers through our HRA exemption calculator first, then plug that final deduction figure in here.
Combining two salaries usually pushes your total income into a higher slab than either employer would calculate alone. That's the entire point of Section 392: tax gets deducted on your actual total income, not on each employer's payment in isolation.
Whichever regime you've already communicated to your new employer for the year, since that's what they'll apply while deducting TDS on your combined salary. You can still switch regimes at the time of filing your ITR. Not sure which ITR form applies to you as a salaried employee with two Form 16s this year? Check that before you file.
No. Form No. 122 and Section 392 apply only to salary income from an employer-employee relationship. Freelance or professional income needs separate advance tax planning, not TDS through this form.
Last Updated: 15 August 2026
Calculations verified by our team including CA Anita Patil. View our full accuracy policy and meet the team →
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