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Introduction
Tax deducted at source (TDS), advance tax or self-assessment tax may sometimes appear in Form 26AS but remain unclaimed in the Income-tax Return. In other cases, the credit may have been claimed in the return but not allowed while processing because of a mismatch in the PAN, assessment year, challan details, TDS statement or amount.
The correct solution depends on:
- whether the return has already been filed;
- whether it has been processed;
- whether the tax credit appears in Form 26AS;
- whether the corresponding income was offered in the same year;
- whether TDS was deducted in a later year; and
- whether the mistake is in the return, deductor’s TDS statement or tax-payment challan.
Applicable law: For FY 2025-26 and AY 2026-27, the Income-tax Act, 1961 continues to apply. Income earned from 1 April 2026 onwards is governed by the Income-tax Act, 2025 and is reported using the concept of a “tax year.”
What Is Unmatched or Unclaimed Tax Credit?
An unclaimed tax credit is a valid TDS, TCS, advance-tax or self-assessment-tax payment that has not been claimed in the applicable return.
An unmatched tax credit generally means that the credit claimed in the return does not match the information available with the Income Tax Department.
Common reasons for a mismatch include:
- the deductor has not filed or corrected the TDS statement
- the TDS amount, TAN or income details were entered incorrectly
- the challan was paid under the wrong assessment year or tax-payment head
- an incorrect BSR code, challan serial number or payment date was entered
- brought-forward and current-year TDS were combined incorrectly
- the corresponding income was not reported
- the same credit was claimed in more than one year
- the credit appeared after the return was processed
Tax Credit Mismatch service: The e-Filing portal compares the tax credit claimed in the return with the credit reflected in Form 26AS.
Identify the Correct Remedy
| Situation | Normal course of action |
|---|---|
| TDS does not appear in Form 26AS | Ask the deductor to file or correct the TDS statement. |
| TDS appears in Form 26AS but was omitted from an unprocessed return | File a revised return within the applicable time limit. |
| Return has been processed and valid credit was not allowed | Submit a rectification request. |
| Correct tax credit was already claimed but CPC did not consider it | Request reprocessing. |
| TDS was deducted now, but the income will be taxable in a later year | Carry the TDS forward through Schedule TDS. |
| Income was taxed earlier, but TDS was deducted in a later year | File Form 71 or Form 102, as applicable. |
| Advance-tax or self-assessment-tax challan details were wrongly entered in the return | Revise the return or request tax-credit rectification. |
| Challan was paid under the wrong assessment year or payment head | Use the Challan Correction service, subject to eligibility. |
| The revised-return time limit has expired | Examine rectification or another legally available remedy. An updated return generally cannot be used merely to increase a refund. |
Step 1: Reconcile the Tax Credits
Before changing the return, compare the following records:
- Form 26AS;
- Form 16, Form 16A or other applicable TDS certificate;
- Annual Information Statement, where relevant;
- advance-tax and self-assessment-tax challan receipts;
- the filed Income-tax Return;
- the tax computation;
- the intimation issued under Section 143(1); and
- any TDS correction confirmation received from the deductor.
Important: Tax credit is normally restricted to the amount available in Form 26AS. Where TDS is missing or incorrectly reported, first ask the employer, bank, tenant, buyer or other deductor to file a correction statement.
Step 2: Claim or Carry Forward Unclaimed TDS
Section 199 of the Income-tax Act, 1961, read with Rule 37BA, generally provides that TDS credit must be given for the assessment year in which the corresponding income is assessable.
Core rule: TDS should not automatically be claimed merely because it appears in Form 26AS. The corresponding income must ordinarily be offered to tax in the same year in which the TDS credit is claimed.
How Schedule TDS-2 Works
The AY 2026-27 ITR forms contain separate fields for:
- unclaimed TDS brought forward;
- TDS deducted during the current financial year;
- TDS credit claimed during the current year;
- corresponding income or receipt offered during the year; and
- TDS carried forward to a subsequent year.
The form instructions state that credit should generally be claimed only when the corresponding receipt is offered to tax during that year, except where a specific exception applies, such as TDS under Section 194N.
When the corresponding income is offered in a later return, the amount may be entered as unclaimed TDS brought forward and claimed in that year.
Important Validation Rules
For AY 2026-27:
- brought-forward TDS and current-year TDS should be reported in separate rows;
- TDS claimed should be supported by corresponding income disclosed in the return; and
- salary TDS should ordinarily be claimed only where salary income has been reported.
The ITR validation rules may prevent submission or generate an error where these conditions are not met.
Step 3: Claim TDS Deducted in a Later Year
A different problem arises where:
- income was already offered to tax in an earlier year; but
- the payer deducted TDS in a later year.
A normal carry-forward entry may not solve this situation because the income has already been taxed.
For Years Governed by the Income-tax Act, 1961
Section 155(20), read with Rule 134, allows the taxpayer to apply for credit through Form 71.
Form 71 may be used where:
- the income was included in an earlier return;
- TDS was deducted and reported in a subsequent financial year;
- the credit was not claimed in any other assessment year; and
- the application is filed within two years from the end of the financial year in which the TDS was deducted.
The application is filed electronically. If accepted, the earlier assessment or intimation may be amended so that the TDS credit is allowed in the year in which the income was originally taxed.
For Tax Years Governed by the Income-tax Act, 2025
The corresponding remedy is provided by Section 288(1), table serial number 11, read with Rule 178 and Form 102.
Form 102 is intended for cases where income was offered in an earlier tax year but the corresponding TDS was deducted or reported in a later tax year. It must generally be filed within two years from the end of the financial year in which the TDS was deducted.
Portal path
Login → e-File → Income-tax Forms → File Income-tax Forms → Form 102
Keep the earlier return, income computation, TDS certificate, Form 26AS entry and proof that the income was previously offered to tax available for verification.
Step 4: Claim Advance-Tax or Self-Assessment-Tax Credit
Advance tax and self-assessment tax are claimed through the tax-payment schedule of the return. The return normally requires:
- BSR code;
- date of deposit;
- challan serial number; and
- amount paid.
If the payment appears in Form 26AS but was omitted or entered incorrectly in the return, the remedy depends on the return status.
Where the return has not been processed
File a revised return within the statutory time limit applicable to that year and enter the correct challan details.
Where the return has been processed
Submit a rectification request and select the tax-credit mismatch option. The rectification facility permits correction of advance-tax and self-assessment-tax challan information, including the BSR code, payment date, challan number and amount.
Where the Challan Itself Is Incorrect
The e-Filing portal provides a Challan Correction service for eligible unconsumed challans.
The online service currently permits correction of specified fields such as:
- assessment year;
- major head; and
- minor head.
Common minor heads
- 100: Advance Tax
- 300: Self-Assessment Tax
- 400: Tax on Regular Assessment
Time-sensitive correction: Online correction is generally available only for eligible unconsumed challans from AY 2020-21 onwards. The assessment year may generally be corrected within seven days of deposit, while specified head corrections may generally be requested within 30 days. Only one online correction request is permitted for a challan. Further corrections may require approaching the jurisdictional Assessing Officer.
Portal path
Login → Services → Challan Correction
Step 5: File a Rectification Request
Rectification is appropriate where the return has already been processed and the intimation or order contains a mistake apparent from the record.
Available rectification options may include:
- Reprocess the Return: where the correct credit was already claimed but was not considered;
- Tax Credit Mismatch Correction: where TDS, TCS, advance-tax or self-assessment-tax details require correction; or
- Return Data Correction: where eligible return data requires rectification.
Portal path
Login → Services → Rectification → New Request
Select the relevant assessment year and request type, enter the corrected tax-credit details and submit the request using the applicable verification method.
Time Limit for Rectification
A rectification application is generally subject to a four-year time limit calculated from the end of the financial year in which the relevant order or intimation was passed.
Under Section 287 of the Income-tax Act, 2025, the corresponding rectification provision also contains a four-year limitation. Where an application is made by the taxpayer, the authority is generally required to pass an order within six months from the end of the month in which the application is received.
Rectification limitation: Rectification should not be used to introduce a completely new claim, income source or deduction that requires fresh investigation and is not apparent from the return and departmental records.
Revised Return or Rectification: Which One Should Be Used?
| Use a revised return where | Use rectification where |
|---|---|
|
|
The e-Filing portal specifically distinguishes rectification from errors that should be corrected through a revised return.
Can an Updated Return Be Used to Claim Missed Tax Credit?
An updated return should not be treated as a normal remedy for claiming an additional refund or reducing an existing tax liability.
An updated return generally cannot be filed where it would:
- reduce the tax payable on the earlier return;
- result in a refund; or
- increase an earlier refund.
Therefore, a missed TDS or challan credit should ordinarily be addressed through a revised return, rectification, challan correction, deductor correction or the delayed-TDS procedure, depending on the circumstances.
Income-tax Act, 1961 and Income-tax Act, 2025 Comparison
| Subject | Income-tax Act, 1961 | Income-tax Act, 2025 |
|---|---|---|
| General TDS credit | Section 199 and Rule 37BA | Section 390 and applicable rules |
| Income taxed earlier but TDS deducted later | Section 155(20), Rule 134 and Form 71 | Section 288(1), table serial number 11, Rule 178 and Form 102 |
| Self-assessment tax | Section 140A | Section 266 |
| Credit for advance tax | Section 219 | Section 410 |
| Rectification | Section 154 | Section 287 |
| Refund entitlement | Sections 237 and 239 | Sections 431 to 433 |
The Income-tax Act, 2025 applies from 1 April 2026. However, returns, assessments, rectifications, refunds and other proceedings relating to periods governed by the Income-tax Act, 1961 generally continue under the earlier Act because of the applicable repeal and savings provisions.
Common Mistakes to Avoid
Claiming TDS That Is Not Reflected in Form 26AS
Merely possessing a TDS certificate may not be sufficient if the deductor has not correctly reported the transaction. Ask the deductor to file a correction statement.
Claiming TDS Without Reporting the Corresponding Income
Except where a specific statutory exception applies, TDS credit should be linked to the year in which the corresponding income is offered to tax.
Reporting Brought-Forward and Current-Year TDS in One Row
The AY 2026-27 validation rules require these amounts to be disclosed separately.
Entering the Wrong Assessment Year in a Challan
A tax payment made under the wrong assessment year may not match the return even though the money has been deposited.
Claiming the Same Credit Twice
A credit carried forward from an earlier year should not also remain claimed in the earlier return.
Filing Rectification Before Checking the Intimation
First verify whether CPC disallowed the credit because of a mismatch, missing income, incorrect challan details or non-availability in Form 26AS.
Using an Updated Return Merely to Obtain a Refund
An updated return is generally not available where the result is a lower tax liability or a higher refund.
Documents to Keep
- Form 26AS;
- applicable TDS certificates;
- AIS or other information statements;
- advance-tax and self-assessment-tax challans;
- filed return and acknowledgement;
- tax computation;
- intimation under Section 143(1);
- correspondence with the deductor;
- corrected TDS certificate or correction confirmation;
- Form 71 or Form 102 acknowledgement; and
- rectification or challan-correction acknowledgement.
Conclusion
A tax credit should be claimed in the correct year, against the correct income and using details that match the Income Tax Department’s records.
Where TDS is missing from Form 26AS, the deductor should correct the TDS statement. Where the credit was omitted from an open return, a revised return may be filed. Where a processed return contains a tax-credit mismatch, rectification or reprocessing may be requested. TDS connected with income taxable in a later year may be carried forward, while TDS deducted after the income was already taxed may require Form 71 or Form 102.
Key takeaway: Correct reconciliation before filing is the most effective way to prevent tax-credit mismatches, unnecessary demands and delayed refunds.
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how to claim refund of TDS deducted in AY 2019-20 ?
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