Form 124 (Form 12BB) Investment Declaration Guide 2026 | LegalDev

Form 124 (Formerly Form 12BB): Complete Investment Declaration Guide for Salaried Employees

If you're a salaried employee in India, you've probably filled out an investment declaration form every year without giving it much thought. That form used to be called Form 12BB. Since April 1, 2026, it has a new name and a new legal basis: Form 124, introduced under the Income-tax Act, 2025 and the Income-tax Rules, 2026.

The purpose hasn't changed. You're still telling your employer how much tax you expect to save through HRA, home loan interest, LTA, and investments under sections like 80C and 80D — so they can deduct the correct TDS from your salary instead of over-taxing you every month. What has changed is the section numbering, the rule reference, and a few extra disclosure requirements. This guide walks you through both the old and new framework so you know exactly what to submit, whichever version your employer is currently using.

What Is Form 124 (Form 12BB)?

Form 124 is a self-declaration submitted by an employee to their employer, listing the deductions and exemptions they intend to claim for the financial year. It is filed under Section 392(5)(b) of the Income-tax Act, 2025, read with Rule 205 of the Income-tax Rules, 2026 — the direct successors to the old Section 192 and Rule 26C that governed Form 12BB.

A few things haven't budged at all:

• It goes to your employer, never to the Income Tax Department directly.
• It's the basis on which your employer estimates your annual tax liability and calculates monthly TDS.
• It is not legally mandatory, but skipping it means your employer withholds tax on your full salary, ignoring any exemptions you're entitled to.

If your organisation hasn't transitioned its HR systems yet, you may still see the form labelled "12BB" — the content and obligations underneath it are functionally the same.

Why Getting This Form Right Actually Matters

Employers don't automatically know about your rent payments, your home loan, or your insurance premiums. Without this declaration, they assume you're claiming nothing and deduct TDS on your entire taxable salary. That means a smaller number landing in your bank account every month, even if you're legitimately eligible for deductions that would lower your tax bill.

Filing an accurate declaration — and backing it up with real proof later — keeps your monthly take-home closer to what you'd actually owe after deductions, instead of forcing you to wait for a refund when you file your ITR.

Before You Start Filling the Form

A little prep work upfront saves you from chasing paperwork later in the year. Get these ready:

• Check your salary structure to confirm whether HRA and LTA are actually part of your CTC. You can't claim exemptions on components you're not receiving.
• Request an interest certificate and repayment schedule from your home loan lender, if applicable.
• Gather receipts for anything you plan to claim — rent receipts, insurance premium payments, tuition fee receipts, donation receipts, and investment certificates for instruments like PPF or ELSS.

Most employers accept estimated figures at the start of the year and only ask for documentary proof closer to January–March, so you don't need every receipt in hand on day one — just a realistic estimate.

How to Fill Form 124: Section by Section

Part I — Your Basic Details

This section is straightforward: your name, address, PAN, and the financial year (or "Tax Year," under the new terminology) you're declaring for.

Part II — Claims and Supporting Evidence

This is the core of the form, broken into four categories.

1. House Rent Allowance (HRA)

If HRA is part of your CTC and you live in rented accommodation, you can claim an exemption by declaring:

• Rent paid to your landlord
• Landlord's name and address
• Landlord's PAN — mandatory once annual rent crosses ₹1 lakh
• Under the newer rules, some employers also ask you to specify your relationship with the landlord, a change introduced to curb fake rent claims

A few practical notes worth keeping in mind:

• Renting your own home doesn't qualify — HRA exemption applies only if you're actually paying rent elsewhere.
• If HRA isn't part of your salary but you do pay rent, Section 80GG offers a comparable deduction route.
• Rent receipts aren't required below ₹3,000 a month, but a signed rental agreement is always good practice.
• If you're paying rent to a parent, have them report it as income in their own return — this keeps the arrangement audit-proof.
• Submitting inflated or fabricated rent receipts is a common trigger for tax scrutiny; it's not worth the risk.

2. Leave Travel Allowance (LTA)

To claim LTA, you'll need travel proof — flight tickets, boarding passes, or travel agent invoices.

• LTA is available only if it's built into your CTC.
• It covers you, your spouse, children, and dependent parents or siblings.
• You can claim it twice in a four-year block (the current block runs 2022–2025); an unused claim from the previous block can often be carried into the first year of the next one.
• Only domestic travel qualifies — international trips and accommodation costs are excluded.

3. Home Loan Interest (Section 24, now Section 22 under the 2025 Act)

You can deduct interest paid on a loan taken to buy, build, repair, or renovate a residential property. To claim this, declare:

• Interest paid or payable during the year
• Your lender's name, address, and PAN or Aadhaar

Two limits to remember:

• Interest deduction: up to ₹2 lakh for a self-occupied property; the full interest amount for a rented-out property.
• Principal repayment: up to ₹1.5 lakh, claimed separately under Section 80C (now Section 123).

You'll typically need an interest certificate from your lender, a possession or completion certificate for the property, and a self-declaration of whether it's self-occupied or rented.

4. Deductions Under Chapter VI-A (80C, 80CCC, 80CCD, 80D, and related sections)

This is where most tax-saving investments and expenses get declared. Here's what counts as valid proof for the common ones:

If you're submitting proofs mid-year (say, in January) but plan to keep investing through March, most employers will let you declare the projected amount for the remaining months as well.

Part III — Verification

The final step is a simple declaration: your name, your parent's name, city, date, and signature, confirming that the information provided is accurate.

Common Mistakes to Avoid

• Over-declaring amounts you don't end up investing — any shortfall gets recovered in a lump sum from your salary, usually in February or March.
• Skipping the landlord's PAN when annual rent exceeds ₹1 lakh, which can get your HRA claim rejected outright.
• Mixing up deduction limits, especially between home loan interest (Section 24/22) and principal repayment (Section 80C/123), which fall under different heads entirely.
• Missing the submission window your employer sets — late declarations often mean higher TDS for the rest of the year, even if you're eligible for deductions.

Frequently Asked Questions

Is Form 12BB still valid, or do I need to use Form 124 now?

From Tax Year 2026-27 onward, Form 124 is the applicable form under the Income-tax Rules, 2026. Some employers may still be using older templates labelled "12BB" during the transition — the underlying declaration requirements are the same either way.

Do I need to submit this form to the Income Tax Department?

No. It goes only to your employer and is used solely to calculate accurate TDS on your salary.

Is filing this declaration compulsory?

No, it's optional. But without it, your employer will deduct TDS as if you have no exemptions or deductions at all, reducing your monthly take-home pay.

What happens if my employer deducted excess TDS because I filed late?

You can claim the excess amount back as a refund when you file your Income Tax Return.

Do pensioners need to file this declaration too?

Yes. Pension is treated as deferred salary for tax purposes, so pensioners submit a similar declaration to their pension-disbursing authority.

What's the difference between this form and Form 12BA?

Form 12BA (now renumbered separately under the 2025 Act) reports perquisites and other benefits you received during the year. This form, by contrast, is your own declaration of the deductions and exemptions you're claiming.