Form 12BB is the declaration an employee gives their employer to claim tax benefits during the year, so that monthly TDS is calculated on the correct, lower figure. Without it, the employer has to deduct tax as if you had no exemptions or deductions at all, and you would wait until you file your return to get the excess back.

What you declare on it

Form 12BB has four parts:

• House Rent Allowance: rent paid, landlord’s name and address, and the landlord’s PAN if annual rent exceeds Rs 1,00,000. This drives your HRA exemption.
• Leave Travel Allowance: the claim for the current LTA block, with travel evidence.
• Home loan interest: interest payable, and the lender’s name, address and PAN, for the Section 24(b) deduction.
• Chapter VI-A deductions: 80C, 80D, 80CCD and the rest.

Form 12BB is the form for FY 2025-26 and earlier. For tax year 2026-27 under the Income-tax Act, 2025, tax advisers and payroll vendors describe Form 124 as the claims statement that takes its place, with Form 122 carrying the regime choice and previous-employer details. What you declare is largely the same, as our note on the investment declaration and proof cycle explains.

How the year runs

You submit Form 12BB early in the financial year with estimates, and the employer deducts TDS on that basis. In the last quarter, typically January, you submit actual proofs, and payroll trues up the deduction: if you invested less than declared, the shortfall in tax is recovered from your final months’ salary. This is the single biggest reason take-home drops in February and March.

Frequently asked questions

Is Form 12BB mandatory?

It is mandatory if you want the employer to give effect to these exemptions and deductions in your TDS. If you do not submit it, you can still claim everything when you file your return.

Do I need proofs at the time of declaration?

Not for the initial declaration, which can be on an estimated basis. Proofs are required before the employer finalises the year, or the benefit is withdrawn and tax recovered.

Does Form 12BB matter under the new tax regime?

Much less. The new regime disallows most of these deductions, so under it Form 12BB mainly matters for the few items still allowed, such as the employer’s NPS contribution.

See how declared deductions change your liability with the Income Tax Calculator, and size your HRA claim with the HRA Exemption Calculator.