My client missed to file ITR 3 for AY 25-26

Yes ITR U can be field now

 In case your client has not filed ITR-3 for AY 2025-26, the procedure will be determined based on the belated return deadline.

 Many non-audit taxpayers had until 15/16 September 2025 to submit their returns for AY 2025-26, and these returns could be filed up to 31 December 2025, the deadline for filing belated returns. ([The Times of India][1])

 Now, the period is over and a normal/late ITR-3 cannot be filed. The only alternative is to file an Updated Return (ITR-U) under Section 139(8A) of the Act with a condition of eligibility and a requirement to pay tax, interest and any additional tax. The ITR-U filing window has been extended to 48 months from the end of the assessment year in the Finance Act 2025. 

 However, please note:

 A refund or increase will not be allowed for ITR-U.
 It can't be used to pay off an existing tax debt.
 The amount of additional tax will be due along with the tax and interest due for the tax. ([All India ITR][3])

 For more accurate answer, please provide the following details:

1. Is the case subject to tax audit?
 2. Are there any taxes to be paid or taxes up for forgiveness?

 3. Has the Department received any notice?
4. What type of income (business, profession, F&O etc.) requires the income tax return form ITR-3?

From these facts, it can be ascertained if filing ITR-U in ITR-3 is the right way to go.

Yes, the only route now is an Updated Return (ITR-U) under Section 139(8A). The belated return window for AY 2025-26 closed on December 31, 2025.

Key points on ITR-U:

1. Time limit: ITR-U can be filed up to 48 months from the end of AY 2025-26, so until March 31, 2030.
2. Additional tax: If filed within 12 months from the end of AY 2025-26 (i.e., before March 31, 2027), the additional tax is 25% of (tax payable plus interest). After 12 months, it becomes 50%.
3. Cannot be used to claim a refund or reduce tax liability. ITR-U only applies where there is additional income to disclose or a tax demand to pay.
4. Business income (ITR-3): ITR-U is available for ITR-3 filers. Your client will also need to ensure the audit report (if applicable) and books of accounts are in order before filing.
5. Interest under Sections 234A, 234B, and 234C will apply on the outstanding tax from the original due date.

If the client had a loss in ITR-3 that they wanted to carry forward, ITR-U does not allow loss carry-forward in most cases, which is a significant limitation. Plan the disclosure carefully to confirm actual tax liability before proceeding. This [belated and updated ITR guide for AY 2026-27](https://taxgarden.in/blog/belated-revised-updated-itr-return-guide-india-ay-2026-27) covers all three return types with the exact deadlines.