A Form 26AS vs AIS mismatch checker compares the TDS/TCS credit in your Form 26AS against the figures in your Annual Information Statement (AIS) and tells you which one to trust before you file. This tool is built for salaried employees, freelancers, small business owners, NRIs, and CAs handling client returns for AY 2026-27.

What Is Form 26AS vs AIS Mismatch Checker?

Form 26AS and AIS both come from the Income Tax Department, but they don't always agree. Form 26AS carries only your TDS, TCS, advance tax, and self-assessment tax credits. AIS carries a much wider set of data — salary, interest, dividends, mutual fund transactions, property deals, and more. A gap between the two is a mismatch, and it can delay your refund or trigger a defective-return notice. This checker takes your entered figures and tells you the exact difference, the percentage gap, and which figure the law says you should rely on. It's useful for salaried employees checking their Form 16 TDS, freelancers and professionals verifying Section 194J deductions, and CAs reconciling multiple client accounts before the 31 July 2026 deadline.

Form 26AS vs AIS Mismatch Checker Formula (as per Section 285BB read with Rule 114-I)

Both statements are issued under Section 285BB of the Income-tax Act, 1961, read with Rule 114-I of the Income-tax Rules, 1962, which requires the Systems Directorate to upload taxpayer information — TDS, TCS, and specified financial transactions — to the e-filing portal.

TDS Mismatch (₹) = TDS/TCS as per AIS − TDS/TCS as per Form 26AS
Mismatch % = (TDS Mismatch ÷ TDS as per Form 26AS) × 100

Income Mismatch (₹) = Income as per AIS − Income declared in ITR

One rule decides which figure wins. TDS credit is governed by Rule 37BA read with Section 199, so Form 26AS is authoritative for claiming tax credit. Income completeness is checked against AIS, so AIS is authoritative for what you must declare. If your basic salary calculation or old-vs-new regime comparison feeds into the same return, run those first using Toolisky's Salary Income Tax Calculator so your declared income figure is accurate before you compare it against AIS here.

How This Calculator Works

1. Enter the TDS/TCS figure exactly as shown in your Form 26AS (downloaded from TRACES).
2. Enter the TDS/TCS figure shown in your AIS (downloaded from the e-filing portal).
3. Optionally, enter the income shown in AIS and the income you plan to declare in your ITR.
4. Click Calculate. The tool computes the rupee and percentage gap for TDS, and separately for income if you filled those fields.
5. It tells you which figure to use for your return and what action to take if there's a gap.

Step-by-Step Example Calculation

Rohit is a salaried employee who also earns FD interest. His Form 26AS shows TDS of ₹42,000. His AIS shows TDS of ₹45,500 because his bank deducted tax on an FD that hasn't yet been uploaded to TRACES.

• TDS Mismatch = ₹45,500 − ₹42,000 = ₹3,500
• Mismatch % = (3,500 ÷ 42,000) × 100 = 8.3%
• Since Form 26AS is authoritative for credit, Rohit can only claim ₹42,000 in his ITR right now.
• He checks his AIS income too: AIS shows total income of ₹9,80,000, and he was about to declare ₹9,65,000. That's a further income mismatch of ₹15,000 he needs to explain or correct before filing.

Rohit contacts his bank to confirm they've filed the TDS return; once Form 26AS updates (usually within 7–15 days of correction), he can claim the full ₹45,500. If he needs to file before that, he claims only ₹42,000 and requests the balance later through a Section 154 rectification.

Who Should Use Form 26AS vs AIS Mismatch Checker

• Salaried employees checking whether their employer's Form 16 TDS matches both 26AS and AIS before filing.
• Freelancers and consultants verifying Section 194J TDS deducted by multiple clients — use Toolisky's Professional Income Tax Calculator alongside this to confirm your net tax liability.
• NRIs reconciling TDS on Indian-source income like rent or FD interest against AIS entries.
• Small business owners and traders with several TDS deductors (banks, clients, tenants) who need a quick line-item check.
• CAs and tax professionals running a fast first-pass check across multiple client PANs before deeper reconciliation.
• Corporate and government employees with FD or savings interest income, best checked with Toolisky's Interest Income Tax Calculator for the correct 80TTA/80TTB treatment first.

Latest Rules You Should Know (2026)

For AY 2026-27 (FY 2025-26), the ITR filing deadline for individuals not requiring audit is 31 July 2026. Returns are auto-checked under Section 143(1) against AIS data. An unresolved income mismatch can trigger a defective-return notice on its own, regardless of your tax computation. If you're unsure which ITR form applies once your reconciliation is done, Toolisky's ITR-1 vs ITR-4 guide covers the AY 2026-27 eligibility changes, including the higher LTCG threshold now allowed in ITR-1.

Separately, the Income-tax Act, 2025 and Income-tax Rules, 2026 came into force from 1 April 2026, replacing the 1961 Act. This does not change AY 2026-27 filing — FY 2025-26 income is still governed by the old Act, old section numbers, and the same Form 26AS/AIS process described here. The new Act's Form 26AS successor applies only from Tax Year 2026-27 onward (returns filed in 2027).

Common Mistakes People Make

• Claiming the AIS TDS figure in the ITR instead of the Form 26AS figure — this gets auto-flagged and the excess credit is disallowed.
• Ignoring a small income mismatch, assuming it's below the Department's threshold — there's no official minimum; even small gaps get compared.
• Not submitting AIS feedback when an entry is wrong, duplicate, or belongs to someone else, which lets the incorrect figure stand by default.
• Waiting until the last week of July to reconcile, leaving no time for the deductor to file a correction before the deadline.
• Comparing AIS and 26AS totals without checking each deductor-wise entry, missing a small but genuine timing gap.
• Assuming Form 26AS and AIS should always match exactly — timing differences between quarters are normal and not always an error.

FAQs

Why does my AIS show more TDS than Form 26AS? 

This usually happens when a deductor has filed their TDS return but the correction or update hasn't yet reflected in Form 26AS on TRACES, or when there's a PAN or TAN quoting error in the original filing. Wait a few days and recheck before assuming it's an error.

Can I claim TDS shown in AIS but missing from Form 26AS? 

No. Tax credit is governed by Rule 37BA read with Section 199, and only the amount reflected in Form 26AS can be claimed. Contact the deductor to file a correction statement so it appears in 26AS before you claim it.

What if AIS shows income I didn't earn?

Log in to the AIS portal, open the entry, and submit feedback marking it as incorrect, duplicate, or belonging to another person. The reporting entity is notified and asked to respond [VERIFY: exact response window against the current AIS process on incometax.gov.in], and your feedback is recorded either way.

Does a small mismatch really matter for ITR filing? 

Yes. The Department's system compares AIS and your ITR without applying a materiality threshold, so even small gaps can trigger a query or a defective-return flag under Section 143(1).

What should I do if the deadline is close and the mismatch isn't resolved? 

File using the amount you can substantiate from Form 26AS for credit, and the more accurate income figure you can support with your own records. You can correct it later via a rectification request or a revised return under Section 139(5).

Is TIS the same as AIS? 

No. TIS (Taxpayer Information Summary) is a category-wise aggregated summary derived from AIS, used to pre-fill your ITR. AIS itself is the detailed, transaction-level statement you should check line by line.

Related Tools on Toolisky

• Salary Income Tax Calculator India
• Professional Income Tax Calculator India
• Interest Income Tax Calculator — FD, Savings & Bonds
• Old vs New Tax Regime Calculator
• ITR-1 vs ITR-4: Which Form to File?
• Rental Income Tax Calculator India