The Income-Tax Department has notified income tax return (ITR-B) form vide notification dated 7 April 2025. This return of income is required to be furnished by any person under clause (a) of sub-section (1) of section 158BC, relating to any search initiated under section 132 or requisition made under section 132A on or after the 1st day of September, 2024 shall be in the Form ITR-B and be verified in the manner indicated therein.
CBDT, vide Notification No. 30/2025 dated Apr 7, 2025, notifies amendment in Income Tax Rules, 1962 by introducing Rule 12AE providing that return of income required to be furnished under Section 158BC(1)(a) relating to search under Section 132 or requisition under Section 132A on or after Sep 1, 2024, shall be filed Form ITR-B and be verified in the manner indicated therein; Rule 12AE also introduces the proforma of FORM ITR-B;  The Notification shall be deemed to be enforceable from Sep 1, 2024. Reproducing the notes forming part of the notification for reference purposes:

Note: 1
-    Assessment Year Y6 to Y1: 
Six assessment years preceding the assessment year relevant to the previous year in which search was initiated under section 132 or any requisition was made under section 132A.

-    Assessment Year Y0: 
    Where search/requisition is concluded in the same year in which it was initiated: Y0 is the period in the assessment year relevant to the previous year which will be from the 1st April of the year in which search/requisition initiated upto the date of execution of the last of the authorisations for search or requisition. 
    Where the date of execution of the last of the authorisations for search or requisition falls in a previous year subsequent to the year in which the search or requisition was initiated: Y0 is the complete assessment year relevant to the previous year starting from the 1st April of the year in which search/requisition is initiated and upto 31st March of that year.

Assessment Year Y+1 (To be filled in case the date of execution of the last of the authorisations for search or requisition falls in a previous year subsequent to the year in which the search or requisition was initiated): Y+1 is the period in the assessment year relevant to the previous year which will be from the 1st April of the year in which last of authorisations of search/requisition was executed and ending with the date of last of authorisations of search/requisition.

Note: 2

-    Refer section 158BB(1A)(c)(i): For the purposes for filing details of the assessment year Y1 where the relevant previous year has ended and the due date for furnishing the return under section 139(1) for such year has not expired, where accounts are not audited (if they are required to be audited), provisional figures are required to be furnished based on the books of account maintained in normal course. This shall not be considered as a return under section 139(1) for the relevant assessment year. Further, this income is required to be included in the return of income furnished under section 139 for the relevant assessment year.

Note: 3

-    Refer section 158BB(1A)(c)(i): For the purposes for filing details of the assessment year Y0 (where Y0 is a complete year) where the relevant previous year has ended and the due date for furnishing the return under section 139(1) for such year has not expired, provisional figures are required to be furnished based on the books of account maintained in normal course. This shall not be considered as a return under section 139(1) for the relevant assessment year. Further, this income is required to be included in the return of income furnished under section 139 for the relevant assessment year.

Note: 4

-    Refer section 158BB(3): In terms of the provisions of this section, any undisclosed income in respect of any international transaction or specified domestic transaction pertaining to the part previous year comprising in the block period is required to be assessed under provisions other than the applicable provisions for block assessment. Accordingly, any undisclosed income on this account is not required to be submitted as part of the block return.”
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CBDT Notifies ITR-B Form for filing return in search cases.pdf