Why Form 16 is a starting point, not a final answer
Form 16 is your employer's summary of the salary paid and tax deducted on your behalf during the year, but it's prepared based on the deduction proofs you submitted to your employer's payroll team by their internal cutoff, which is often earlier than the actual tax-filing deadline. If you made an eligible investment or expense after that internal cutoff but before the financial year closed, Form 16 won't reflect it — but you're still entitled to claim it directly in your ITR.
This is the single most important thing to understand about Form 16 before filing: it's a helpful summary, not a legally binding ceiling on what you can claim. Treating every number on it as final, without checking your own records, is how people under-claim deductions they were genuinely entitled to.
Cross-check the TDS figure against Form 26AS
Form 16's Part A shows the TDS your employer deducted and reported to the government each quarter. This figure should match what appears in your Form 26AS (and the more detailed Annual Information Statement, or AIS) — both of which you can access through the income tax portal. If these don't match, it typically means your employer deducted the tax from your salary but hasn't correctly deposited or reported it to the government yet.
This mismatch matters because the tax department credits you based on Form 26AS/AIS, not Form 16 — if your employer's reporting is incomplete, you could face a demand notice for tax that was actually deducted from your salary but never properly credited to your PAN. Catching this before filing, and following up with your employer's payroll or finance team, is far easier than untangling it after a mismatch notice arrives.
Check that your claimed deductions actually appear
Go through Form 16 Part B's deduction breakdown — 80C, 80D, HRA exemption, home loan interest — and compare it against what you actually invested or paid during the year, using your own investment receipts, rent receipts, and loan statements as the source of truth. It's common for a deduction to be partially reflected (say, only 10 months of a 12-month home loan interest payment) if your proof submission to payroll was incomplete or late.
Any gap between what Form 16 shows and what you're actually eligible for based on your own records can — and should — still be claimed correctly in your ITR itself, even though it wasn't reflected in the TDS calculation your employer made during the year. The ITR filing is your opportunity to correct this, not just transcribe Form 16 verbatim.
If you changed jobs during the year
If you had more than one employer in the same financial year, you'll have a separate Form 16 from each. A common and costly mistake here is each employer independently applying the full basic exemption and standard deduction as if you'd worked for them the entire year, which under-deducts TDS across both jobs combined — leaving you with unexpected tax due at filing time rather than a refund.
When filing, your total income needs to combine both Form 16s correctly, and any deduction or exemption should be counted once across your combined income for the year, not duplicated per employer. If you didn't declare your previous employer's income to your new employer's payroll during the year (a common oversight), expect this reconciliation to surface a tax payable amount at filing, rather than a smooth refund.
What to do if you spot a genuine error
If you find a clear discrepancy — TDS not matching Form 26AS, a deduction you're entitled to that's missing entirely, or an incorrect salary figure — contact your employer's payroll or HR team before filing, since they may need to issue a revised Form 16 or correct their TDS return. Filing based on Form 16 as-is, while your own records show something different, doesn't resolve the underlying discrepancy and can complicate matters later if the tax department's systems flag the mismatch.
For deductions you're entitled to but that weren't reflected due to a payroll timing issue rather than an error, you generally don't need a revised Form 16 — you can claim the correct amount directly in your ITR using your own supporting documents, since the ITR form's actual deduction fields aren't restricted to only what Form 16 shows.
A pre-filing checklist
1. Confirm Form 16's TDS figure matches Form 26AS/AIS exactly. 2. Compare Part B's deduction breakdown against your own investment and payment records. 3. If you changed jobs, gather Form 16 from every employer for the year and combine income correctly. 4. Claim any deduction you're eligible for but that's missing from Form 16, using your own receipts as support. 5. Flag any genuine discrepancy with your employer's payroll team before filing, not after.