26AS vs AIS vs TDS Certificates: What Each Source Can and Cannot Prove
Form 26AS, AIS and TDS certificates answer related but different questions. A reconciliation is strongest when the team records the purpose and limitations of each source instead of calling every difference a “credit mismatch”.
Use each source for its job
Form 26AS is the taxpayer’s annual tax statement; from AY 2023-24 onwards, the Income Tax Department’s AIS FAQ says it displays only TDS/TCS-related data. It is an important reference for credit appearing against the taxpayer’s account, but a missing entry still requires a deductor-side investigation.
AIS provides a broader information view, including reported financial information and feedback facilities. It is useful for identifying additional transactions or differences that deserve investigation; it is not a substitute for the books, contract, invoice or bank evidence.
TDS certificates support the deductor’s statement and the amount communicated to the payee. They should be checked for PAN, period, section and amount, but the certificate alone does not prove that the underlying income was recorded in the correct period.
Books and invoices establish the commercial transaction, accounting period and income or expense recognition. They do not prove that a deductor correctly filed the TDS statement.
Reconcile in this order
- Tie the books and certificates to the actual payer, period and payment.
- Compare the deduction and section to the filed statement and challan allocation.
- Compare the filed statement to 26AS and investigate missing or corrected entries.
- Review AIS for additional information, duplicate reporting or a period difference.
- Record the action: accept, follow up with deductor, correct the books, correct the statement or document the timing explanation.
Do not claim an unmatched amount simply because it appears in one statement. Do not reject a valid item merely because a correction has not yet flowed through the portal. Record the evidence date and revisit material open items before filing.
How AI can assist
AI can group differences by payer, quarter, PAN and amount; draft a follow-up list; and turn verified facts into an exception note. Keep the source references visible and prohibit the model from inventing a filing status or legal conclusion.
For a complete review, use the TDS reconciliation working paper, 26Q reconciliation checker and TDS reconciliation do’s and don’ts. The reconciliation is complete only when every material difference has an owner, evidence and disposition.
Check the current Income Tax Department AIS FAQs and the live portal statements for the relevant year. This distinction matters because the coverage and display of reported information can change.