Substitution of new Chapter for Chapter XIV-B 158B. Definitions.—In this Chapter, unless the context otherwise requires,— (a) “block period” means the period comprising previous years relevant to six assessment years preceding the previous year in which the search was initiated under section 132 or any requisition was made under section 132A and also includes the period starting from the 1st day of April of the previous year in which search was initiated or requisition was made and ending on the date of the execution of the last of the authorisations for such search or such requisition; (b) “undisclosed income” includes any money, bullion, jewellery or other valuable article or thing or any expenditure or any income based on any entry in the books of account or other documents or transactions, where such money, bullion, jewellery, valuable article, thing, entry in the books of account or other document or transaction represents wholly or partly income or property which has not been or would not have been disclosed for the purposes of this Act, or any expense, exemption, deduction or allowance claimed under this Act which is found to be incorrect, in respect of the block period. Explanation.—For the purposes of this Chapter, the last of the authorisations shall be deemed to have been executed,— (a) in the case of search, on the conclusion of search as recorded in the last panchnama drawn in relation to any person in whose case the warrant of authorisation has been issued; (b) in the case of requisition under section 132A, on the actual receipt of the books of account or other documents or assets by the Authorised Officer. 158BA. Assessment of total income as a result of search – (1) Notwithstanding anything in any other provisions of this Act, where on or after the 1st day of September, 2024, a search is initiated under section 132, or books of account, other documents or any assets are requisitioned under section 132A, in the case of any person, then, the Assessing Officer shall proceed to assess or reassess the total income of the block period in accordance with the provisions of this Chapter. (2) The assessment or reassessment or recomputation under the provisions of this Act (other than this Chapter), if any, pertaining to any assessment year falling in the block period, pending on the date of initiation of the search under section 132, or making of requisition under section 132A, as the case may be, shall abate and shall be deemed to have abated on the date of initiation of search or making of requisition. (3) Where during the course of any pending proceeding for the assessment or reassessment or recomputation under the provisions of this Act (other than this Chapter), a reference under sub-section (1) of section 92CA has been made, or an order under sub-section (3) of section 92CA has been passed, such assessment or reassessment or recomputation, along with such reference made or order passed, as the case may be, shall also abate and shall be deemed to have abated on the date of initiation of search or making of requisition. (4) Where any assessment under the provisions of this Chapter is pending in the case of an assessee in whose case a subsequent search is initiated, or a requisition is made, such assessment shall be duly completed, and thereafter, the assessment in respect of such subsequent search or requisition shall be made under the provisions of this Chapter: Provided that in a case where the period of completing the assessment in respect of subsequent search is less than three months such period shall be extended to three months from the end of the month in which the assessment in respect of the earlier search was completed. (5) If any proceeding initiated under this Chapter or any order of assessment or reassessment made under clause (c) of sub-section (1) of section 158BC has been annulled in appeal or any other legal proceeding, then, notwithstanding anything in this Chapter or section 153, the assessment or reassessment relating to any assessment year which has abated under sub-section (2) or sub-section (3), shall revive with effect from the date of receipt of the order of such annulment by the Principal Commissioner or Commissioner: Provided that such revival shall cease to have effect, if such order of annulment is set aside. (6) The total income (other than undisclosed income) of the assessment year relevant to the previous year in which the last of the authorisations for a search is executed or a requisition is made, shall be assessed separately in accordance with the other provisions of this Act. (7) The total income relating to the block period shall be charged to tax, at the rate specified in section 113, as income of the block period irrespective of the previous year or years to which such income relates. 158BB. Computation of total income of block period – (1) The total income referred to in sub-section (1) of section 158BA of the block period shall be the aggregate of the following, namely:— (i) total income disclosed in the return furnished under section 158BC; (ii) total income assessed under sub-section (3) of section 143 or section 144 or section 147 or section 153A or section 153C prior to the date of initiation of the search or the date of requisition, as the case may be; (iii) total income declared in the return of income filed under section 139 or in response to a notice under sub-section (1) of section 142 or section 148 and not covered under clause (i) or clause (ii); (iv) total income determined where the previous year has not ended, on the basis of entries relating to such income or transactions as recorded in the books of account and other documents maintained in the normal course on or before the date of last of the authorisations for the search or requisition relating to such previous year; (v) undisclosed income determined by the