Quick answer: Form 12BB is the investment declaration a salaried employee gives their employer so that monthly TDS on salary reflects real deductions instead of the worst case. From 1 April 2026 it is replaced by Form 124 under the Income-tax Act, 2025. It goes to your employer only, never to the tax department, and it matters mainly if you are on the old tax regime.
If you are salaried, your employer deducts tax from your salary every month. That deduction is called TDS on salary. Your employer can only reduce it for deductions you have told them about. Form 12BB — now Form 124 — is how you tell them.
Without it, your employer assumes you claim nothing. Your monthly take-home pay drops, and you wait until you file your return to get the extra tax back as a refund. With it, your monthly TDS tracks your real tax much more closely.
What is Form 12BB?
Form 12BB is a statement of claims an employee gives to their employer. It lists the exemptions and deductions you plan to claim for the year: house rent allowance, leave travel allowance, home loan interest, and Chapter VI-A deductions such as 80C, 80D, 80E and 80G.
The Central Board of Direct Taxes (CBDT) introduced this standard format in 2016, so that every employer collects the same declaration instead of inventing its own form. It is a private document between you and your employer. You never send it to the Income Tax Department, and your actual claim for deduction is made later, when you file your income tax return (ITR).
Why is Form 12BB now called Form 124?
From 1 April 2026, the Income-tax Act, 2025 replaced the Income-tax Act, 1961. Forms changed with the law. The salary TDS provision that was Section 192 of the old Act is now Section 392 of the 2025 Act, and the employee declaration form that was Form 12BB under Rule 26C is now Form 124 under the Income-tax Rules, 2026.
The change is about the form number, not the idea. For income of FY 2025-26, the old form still applied. For income earned on or after 1 April 2026 — tax year 2026-27 onward — use Form 124. Your employer’s payroll portal may still show the old name for a while; what matters is that you submit the declaration the portal asks for, in the window it sets.
What can you declare in Form 12BB / Form 124?
The form has four parts. Here is what goes in each, with the limits that apply under the old regime.
| What you declare | Details to give | Limit to know |
|---|---|---|
| House rent allowance (HRA) | Landlord name and address, monthly rent, and the landlord’s PAN if total rent to that landlord crosses ₹1,00,000 in the year | Exemption follows the lowest-of-three HRA rule |
| Leave travel allowance (LTA/LTC) | Journey details and tickets for travel claimed | Exempt for two journeys in a block of four calendar years |
| Home loan interest (self-occupied house) | Lender name, loan details, interest paid or payable | ₹2,00,000 a year |
| Section 123 (earlier 80C) | EPF, PPF, ELSS, life insurance premium, tuition fees, home loan principal | ₹1,50,000 a year |
| Section 126 (earlier 80D) | Health insurance premium for self, spouse, children and parents | ₹25,000 for self and family, plus up to ₹25,000 for parents; ₹50,000 each where senior citizens are covered |
| Section 129 (earlier 80E) | Education loan interest certificate from the lender | No upper limit |
| 80G donations and other Chapter VI-A items | Donation receipts, NPS contribution proof, savings interest details | As per each section; 80G is 50% or 100% of the donation depending on the fund |
One item does not belong in this form even though it survives in both regimes: your employer’s NPS contribution under Section 80CCD(2). That is the employer’s contribution, not yours, so the employer accounts for it directly. Your own NPS contribution under 80CCD(1B), up to ₹50,000 over and above 80C, does go in the declaration.
When do you submit the declaration?
Most employers run it in two rounds. At the start of the financial year, around April, you give an estimated declaration: what you expect to invest and spend during the year. This lets payroll spread your TDS evenly across the year instead of deducting at full rate for months and then correcting late.
The second round comes near the end of the year, usually between December and January, as per your employer’s window. This is the final declaration with proofs: rent receipts or the rent agreement, the home loan interest certificate, insurance premium receipts, ELSS and PPF statements, and donation receipts. Employers collect these before closing payroll for the year, so that the last months’ TDS is computed on verified figures.
Keep the proofs ready before the window opens. A declaration without proof at proof time is treated as if it was never made, and the correction lands in your February or March salary.
Do you need Form 12BB under the new tax regime?
Rarely. The new regime is the default regime. If you submit no declaration, your employer deducts TDS under the new regime. The new regime does not allow HRA, LTA, home loan interest on a self-occupied house, or most Chapter VI-A deductions — so there is very little for the form to carry.
The first decision is therefore the regime, not the form. If the old regime suits you — because your HRA, 80C, 80D and home loan interest add up to more than the new regime’s lower slab rates save you — tick the old-regime choice in the declaration and submit the form. If the new regime suits you better, the declaration changes almost nothing, and you can confirm the regime choice with your employer and move on.
Note that the declaration choice affects TDS during the year only. Your final regime choice is made when you file your ITR. If you are not a business-income taxpayer, you can still pick the other regime in your return; the TDS already deducted is then adjusted through your return and any refund.
For a full comparison with worked break-even figures, see our old vs new tax regime guide and our Form 10-IEA opt-out guide for business owners.
What happens if you do not submit Form 12BB on time?
Your employer has no basis to apply any exemption or deduction except the standard deduction, which is automatic: ₹50,000 under the old regime and ₹75,000 under the new regime. Everything else is ignored, so TDS is computed on nearly your full salary, your monthly take-home pay falls, and the extra tax sits with the government until you file your return.
You lose nothing permanently. Every eligible deduction can still be claimed in your ITR, and the excess TDS comes back as a refund after processing. What you lose is cash flow through the year — money that could have stayed in your monthly salary. If your employer has already closed the declaration window, ask payroll whether a late submission is still possible; if not, file your return carefully and claim everything there.
What happens if you declare more than you actually invest?
At proof time, your employer recomputes your tax without the unsupported claims. The shortfall is recovered from your remaining salary, usually in February and March, in one or two large cuts. That is the normal, expected outcome — and it is why inflated declarations hurt more than they help.
Deliberately false claims are worse: they can draw scrutiny when the return is processed, and a wrong claim in the ITR itself can attract penalty for misreporting. The safe rule is simple. Declare what you genuinely expect to invest, keep the proofs, and revise the declaration downward during the year if your plans change.
What is the difference between Form 12BB and Form 12B?
The names differ by one letter and the purpose is completely different. Form 12BB (now Form 124) is the yearly investment declaration you give to your employer. Form 12B is the form you give to a new employer when you change jobs in the middle of a financial year: it states the salary you earned and the TDS already deducted by your previous employer, so the new employer can compute TDS on your combined income instead of taxing each job separately.
When you change jobs, you therefore submit two things to the new employer: Form 12B for the previous employment, and a fresh investment declaration (Form 124) for the current year. If you skip Form 12B, the new employer taxes only the salary it pays you, and you may face a tax demand plus interest when you file your return. Our TDS on salary guide explains how salary TDS is computed, and our HRA guide covers the rent details your declaration needs.
Worked example: how the declaration changes monthly TDS
Take a salaried employee with a gross salary of ₹1,00,000 a month, or ₹12,00,000 a year. This is an illustration using FY 2026-27 slab rates, not a promise — your figures will differ with allowances and other income.
With an old-regime declaration: standard deduction ₹50,000, HRA exemption ₹1,80,000, Section 123 investments ₹1,50,000, Section 126 health premium ₹25,000, home loan interest ₹2,00,000. Total deductions ₹6,05,000. Taxable income ₹5,95,000. Tax: nil up to ₹2,50,000, 5% on the next ₹2,50,000 (₹12,500), 20% on the remaining ₹95,000 (₹19,000) — ₹31,500, plus 4% cess = ₹32,760 a year, or about ₹2,730 a month.
Without any declaration (new regime default): taxable income ₹12,00,000 minus ₹75,000 standard deduction = ₹11,25,000. Tax: nil up to ₹4,00,000, 5% on the next ₹4,00,000 (₹20,000), 10% on the remaining ₹3,25,000 (₹32,500) — ₹52,500, plus 4% cess = ₹54,600 a year, or about ₹4,550 a month.
The declaration is worth about ₹1,820 a month, or ₹21,840 across the year, in cash flow — even though the final tax for the year would be settled in the return either way. That monthly difference is the whole point of the form.
Frequently asked questions
Is Form 12BB mandatory?
Not by law. No one is fined simply for not submitting it. But without it, your employer can only apply the standard deduction, so your monthly TDS is higher. If you want lower TDS during the year, submitting the form is effectively necessary.
Do I need to submit Form 12BB to the Income Tax Department?
No. The form goes to your employer only. The Income Tax Department never receives it. Your deduction claim is made when you file your ITR, using your Form 16 and your own records.
Do I need Form 12BB under the new tax regime?
Rarely. The new regime allows almost none of the deductions the form carries — no HRA, no LTA, no home loan interest on a self-occupied house, and no most Chapter VI-A deductions. Confirm your regime choice with your employer first; the form matters only if you choose the old regime.
What happens if I do not submit Form 12BB on time?
Your employer deducts TDS using only the standard deduction, so your take-home pay drops for the remaining months. You can still claim every eligible deduction in your ITR and receive the excess tax as a refund after processing.
What happens if I declare more than I actually invest?
When your employer checks the proofs, usually in December or January, it recomputes your tax without the unsupported claims and recovers the shortfall from your February and March salary. Deliberately false claims in the return itself can also attract penalty, so declare only what you genuinely expect to invest.
What is the difference between Form 12BB and Form 12B?
Form 12BB (now Form 124) is the yearly investment declaration you give to your employer. Form 12B is given to a new employer when you change jobs mid-year, to report salary and TDS from your previous employer so that TDS is computed on your combined income.
Official sources
- Income Tax Department e-filing portal (incometax.gov.in) — official forms, including the salary TDS declaration form, and filing guidance
- Income Tax India (incometaxindia.gov.in) — CBDT circulars and the Income-tax Rules
Reviewed by Asuthod Rathod, CA
Last updated: 4 November 2026
Disclaimer: This article explains the law in simple terms for general guidance. It is not tax advice for your specific situation. Figures and limits are as per the old regime and FY 2026-27 slabs stated above; check the current rules on the official portal or ask a chartered accountant before acting.
Editorial byline for eircicai income tax guides — covering the Income Tax Act, 2025, section renumbering, regime comparison, and deductions. Content is reviewed by Asuthod Rathod, CA.