Every year, salaried employees scramble to fill their investment declaration form. Most fill it wrong — leaving lakhs on the table or getting hammered by excess TDS in March. Here is the definitive, field-by-field guide.
Form 124 is the investment declaration form that salaried employees submit to their employer under Section 192(2D) of the Income-tax Act, 2025 (previously known as Form 12BB under the old 1961 Act). It tells your employer what tax-saving investments and expenses you plan to claim, so they can adjust your TDS accordingly.
Without Form 124, your employer assumes zero deductions beyond the standard deduction. This means they deduct TDS at the highest applicable rate on your full salary. Submitting this form correctly can reduce your monthly TDS by ₹5,000–₹25,000 depending on your salary and investments.
| Submission Window | What Happens | Documents Needed |
|---|---|---|
| April – May (Provisional) | Declare planned investments for the year. Employer adjusts TDS from the first month itself. | Self-declaration only. No proofs needed. |
| January – February (Final Proof) | Submit actual investment proofs. Employer recalculates full-year TDS. | Receipts, certificates, rent agreements, PAN of landlord, etc. |
If you declare ₹1.5 lakh under 80C in April but fail to submit proof by February, your employer will reverse the entire benefit and deduct the accumulated shortfall in your February/March salary. This can cut your March take-home pay by 30-50%.
Form 124 has four main sections. Here is what goes where:
| Field | What to Fill | Proof Required |
|---|---|---|
| Rent Paid | Monthly rent × months in FY (e.g., ₹20,000 × 12 = ₹2,40,000) | Rent receipts for each month |
| Landlord Name | Full legal name of your landlord | — |
| Landlord Address | Complete address of the rented property | Rent agreement (recommended) |
| Landlord PAN | Mandatory if annual rent exceeds ₹1,00,000 | Copy of landlord's PAN card |
If your annual rent exceeds ₹1,00,000 and you do not provide the landlord's PAN, the employer is legally required to deny the HRA exemption. Some employees use fake PANs — this can trigger a demand notice under Section 143(1) and a penalty of up to ₹10,000 under Section 272B.
| Field | What to Fill | Proof Required |
|---|---|---|
| Travel Amount Claimed | Actual domestic travel cost (economy airfare or AC 1st class rail) | Boarding passes, tickets, bills |
| Journey Details | Origin and destination, dates of travel | — |
LTC is exempt only for domestic travel, for the employee and immediate family. Two journeys are allowed in a block of 4 calendar years (current block: 2022-2025). Only the travel cost is exempt — hotel, food, and sightseeing are not covered.
| Field | What to Fill | Proof Required |
|---|---|---|
| Interest Paid/Payable | Total housing loan interest for the year (max ₹2,00,000 for self-occupied) | Interest certificate from bank/NBFC |
| Lender Name & Address | Full name and address of the lending institution | — |
| Lender PAN/TAN | PAN or TAN of the bank/lender | Loan statement showing PAN |
If the property is let out (rented), there is no ₹2 lakh cap — the entire interest can be claimed. Principal repayment falls under Section 80C (Section 3 of this form).
This is the largest and most important section. Here's the complete breakdown:
| Deduction | Section (2025 Act) | Max Limit | Common Investments |
|---|---|---|---|
| 80C | Sec 123 | ₹1,50,000 | PPF, ELSS, EPF, Life Insurance, NSC, SSY, Home Loan Principal, Tuition Fees |
| 80CCC | Sec 123 | Included in 80C ₹1.5L | Pension fund premiums |
| 80CCD(1) | Sec 123 | Included in 80C ₹1.5L | Employee NPS contribution (own) |
| 80CCD(1B) | Sec 123 | ₹50,000 (additional) | Additional NPS contribution (above ₹1.5L) |
| 80CCD(2) | Sec 123 | 14% of Basic Salary | Employer NPS contribution — allowed in New Regime too! |
| 80D | Sec 124 | ₹25,000 / ₹50,000 (senior) | Health insurance premium — self, spouse, children, parents |
| 80DD | — | ₹75,000 / ₹1,25,000 | Maintenance of disabled dependent |
| 80E | — | No limit | Education loan interest (for 8 years from start of repayment) |
| 80EEA | — | ₹1,50,000 | Home loan interest for affordable housing (stamp value ≤ ₹45L) |
| 80G | — | Varies (50% or 100%) | Donations to eligible institutions |
| 80TTA | — | ₹10,000 | Savings account interest (non-senior citizens) |
| 80TTB | — | ₹50,000 | Interest income for senior citizens (all deposits) |
Declaring ₹1.5 lakh under 80C when you've only invested ₹80,000 leads to a massive TDS catch-up in March when proofs don't match declarations. Only declare what you are certain to invest.
Your employer's EPF deduction (12% of basic) already counts towards the ₹1.5 lakh 80C limit. If your basic is ₹6 lakh, your EPF alone is ₹72,000. You only need ₹78,000 more to max out 80C — not ₹1.5 lakh.
If you've opted for the New Tax Regime, most deductions in Form 124 are irrelevant. The only exception is Section 80CCD(2) — employer NPS contribution. Don't waste time filling the full form.
Instead of manually filling Form 124, use our free Form 124 Generator. It auto-formats the declaration, calculates totals, and produces a print-ready document that matches the Income-tax Act, 2025 prescribed format.
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