Section 158BB — Computation of Total Undisclosed Income of the Block Period

CHAPTER XIV-B — SPECIAL PROCEDURE FOR ASSESSMENT OF SEARCH CASES (BLOCK ASSESSMENT)

Section 158BB — Computation of Total Undisclosed Income of the Block Period

Case Laws & Commentary · Income-tax Act, 1961 (as amended by the Finance Act, 2026) · bharattax.co Treatise

Status: Live (revived regime). The computation provision. Substituted by the Finance (No. 2) Act, 2024 with effect from 1 September 2024 and amended by the Finance Act, 2025. It builds total undisclosed income from the return figure and the Assessing Officer's determination, carves out income already assessed or returned, and ties computation to 'evidence found as a result of search or survey or requisition' and related material.

FA 2026: No amendment by the Finance Act, 2026.

A. SECTION COMMENTARY

Section 158BB is the engine room of the block. Total undisclosed income is the aggregate of (a) the undisclosed income declared in the section 158BC return and (b) the undisclosed income determined by the Assessing Officer under sub-section (2). Sub-section (1A) excludes income that is not properly part of the block — broadly, income already determined or assessed under the ordinary provisions before the search, income already declared in pre-search returns, and income computed by the assessee on the basis of regular books for the broken periods — so that the block captures only the genuinely undisclosed component and does not double-count disclosed income.

Sub-section (2) is the heart of the matter: the undisclosed income is computed in accordance with the Act 'on the basis of evidence found as a result of search or survey or requisition of books of account or other documents and any other material or information as are either available with the Assessing Officer or come to his notice' during the Chapter proceedings. The evidentiary anchor is thus written into the computation, codifying the judicial rule that block additions must be traceable to search/survey/requisition material.

Sub-section (4) imports specific machinery: for a firm, income is determined before deduction of partners' salary/interest/remuneration; the deeming sections 68, 69, 69A, 69B and 69C apply with 'financial year' read as the relevant previous year of the block; and section 92CA (transfer pricing) applies with appropriate reading of 'previous year'. Sub-section (7) bars set-off of brought-forward losses and unabsorbed depreciation (referable to years before the block) against the undisclosed income, although losses determined within the block years may be adjusted against undisclosed income of other block years.

Two practical themes recur. First, the reach of admissible evidence — material from a survey at a connected person's premises, or an enquiry that takes a seized document as its starting point, can feed the computation provided the link to search material is maintained. Second, discipline against estimate untethered to evidence, and the telescoping doctrine, which prevents the same undisclosed fund being taxed twice across block years. The authorities below mark out the permitted reach, the outer limit, and the telescoping principle.

B. STATUTORY POSITION (verbatim text)

Reproduced from the local Act (base text to the Finance Act, 2025). Note: '***' marks words/a sub-section omitted by the Finance Act, 2025 and retained only to show the omission.

158BB. (1) The total undisclosed income referred to in sub-section (1) of section 158BA of the block period shall be the aggregate of the following, namely:—

(a) undisclosed income declared in the return furnished under section 158BC;

(b) undisclosed income determined by the Assessing Officer under sub-section (2).

(1A) The following income shall not be included in the total undisclosed income of the block period, namely:—

(a) the total income determined under sub-section (1) of section 143 or assessed under section 143 or section 144 or section 147 or section 153A or section 153C or assessed earlier under clause (c) of sub-section (1) of section 158BC or sub-section (4) of section 245D, prior to the date of initiation of the search or the date of requisition, in respect of any of the previous year comprising the block period;

(b) the 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, prior to the date of initiation of the search or the date of requisition, in respect of any of the previous year comprising the block period, and not covered under clause (a);

(c) the income computed by the assessee, in respect of—

(i) a previous year, where such previous year has ended and the due date for furnishing the return for such year has not expired prior to the date of initiation of the search or the date of requisition, 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 before the date of initiation of search or the date of requisition;

(ii) the period commencing from the 1st day of April of the previous year in which the search is initiated or requisition is made and ending on the day immediately preceding the date of initiation of search or requisition, 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 for such period on or before the day immediately preceding the date of initiation of search or the date of requisition;

(iii) the period commencing from the date of initiation of the search or the date of requisition and ending on the date of the execution of the last of the authorisations for search or requisition, 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 for such period on or before the date of the execution of the last of the authorisations:

Provided that where the Assessing Officer is of the opinion that any part of the income as computed by the assessee under this clause is undisclosed, he may recompute such income;

(d) the total income referred to in sub-section (5) of section 115A or section 115G or sub-section (1) of section 194P.

(2) The undisclosed income falling within the block period, *** shall be computed in accordance with the provisions of this Act, on the basis of evidence found as a result of search or survey or requisition of books of account or other documents and any other material or information as are either available with the Assessing Officer or come to his notice during the course of proceedings under this Chapter.

(3) Where any income required to be determined as a result of search or requisition of books of account or other documents and any other material or information as are either available with the Assessing Officer or come to his notice during the course of proceedings under this Chapter, or determined on the basis of entries relating to such income or transactions as recorded in books of account and other documents maintained in the normal course on or before the date of the execution of the last of the authorisations, relates to any international transaction or specified domestic transaction referred to in section 92CA, pertaining to the period beginning from the 1st day of April of the previous year in which last of the authorisations was executed and ending with the date on which last of the authorisations was executed, such income shall not be considered for the purposes of determining the total undisclosed income of the block period and such income shall be considered in the assessment made under the other provisions of this Act.

(4) For the purposes of determination of undisclosed income,--

(a) of a firm, such income assessed for each of the previous years falling within the block period shall be the income determined before allowing deduction of salary, interest, commission, bonus or remuneration by whatever name called to any partner not being a working partner;

(b) the provisions of sections 68, 69, 69A, 69B and 69C shall, so far as may be, apply and references to "financial year" in those sections shall be construed as references to the relevant previous year falling in the block period;

(c) the provisions of section 92CA shall, so far as may be, apply and references to "previous year" in that section shall be construed as reference to the relevant previous year falling in the block period excluding the period referred to in sub-section (3).

(5) The tax referred to in sub-section (7) of section 158BA shall be charged on the total undisclosed income determined in the manner specified in sub- section (1).

(6) ***

(7) For the purposes of assessment under this Chapter, losses brought forward from the previous year (prior to the first previous year comprising the block period) under Chapter VI or unabsorbed depreciation under sub-section (2) of section 32 shall not be set off against the undisclosed income determined in the block assessment under this Chapter but may be carried forward for being set off in the previous year subsequent to the assessment year in which the block period ends, for the remaining period, taking into account the block period and such assessment year, and in accordance with the provisions of this Act.

C. AUTHORITIES

These decisions — Supreme Court, High Court and Tribunal — define the evidentiary foundation of block computation, the permissible reach of the material, and the telescoping doctrine against double taxation.

1. Computation must rest on evidence found in the search (not presumption)

CIT v. Mukundray K. Shah (2007) 290 ITR 433 (SC)

Court: Supreme Court of India; judgment dated 10 April 2007 (209 CTR 97 / 160 Taxman 276).

Held: Material found in a search (there, a diary) which becomes the starting point of an enquiry that, read with its other results, leads to detection of undisclosed income, can validly found a block assessment under section 158BB. Block computation must rest on evidence found as a result of the search and material relatable thereto.

Significance: Illustrates the evidentiary anchor of block computation; applies to the recomputation power in the recast section 158BB.

CIT v. Ravi Kant Jain (2001) 250 ITR 141 (Delhi)

Court: High Court of Delhi; Division Bench, judgment dated 15 March 2001.

Held: Block assessment under Chapter XIV-B is not a substitute for a regular assessment; its scope is limited to the undisclosed income unearthed as a result of the search. Income not detected on the basis of material gathered in the search cannot be brought to tax under the block; the regular and block streams run separately.

Significance: The classic High Court statement of the limited, search-anchored scope of block assessment, preserved by the recast scheme (section 158BA(6)).

Sunder Agencies v. DCIT (1997) 63 ITD 245 (Mumbai ITAT)

Court: Income-tax Appellate Tribunal, Mumbai Bench.

Held: The scheme of Chapter XIV-B does not empower the Revenue to presume or draw assumptions about undisclosed income. Additions or disallowances in a block assessment must be based on evidence found at the time of the search, and cannot rest on presumptions or inferences drawn from the material otherwise on record.

Significance: An early and frequently-cited Tribunal authority establishing that block additions must be evidence-based, not presumption-based — the principle now embedded in section 158BB(2).

2. Reach of admissible material — survey of a connected person

CIT v. S. Ajit Kumar (2018) 404 ITR 526 (SC)

Court: Supreme Court of India; judgment dated 2 May 2018 (302 CTR 177 / 255 Taxman 286).

Held: While an addition in a block assessment must rest on evidence found in the search, material gathered in a survey under section 133A conducted simultaneously at the premises of a connected person (there, the builder who received unaccounted cash) can be utilised in the block assessment of the searched assessee, by virtue of section 158BB read with section 158BH.

Significance: Defines the permissible reach of block evidence beyond the search premises, anchored in the saving clause (section 158BH); carried forward into the recast section 158BB ('found as a result of search or survey').

3. Telescoping / intangible additions — avoiding double taxation of the same fund

Anantharam Veerasinghaiah & Co. v. CIT (1980) 123 ITR 457 (SC) — cognate (intangible additions / telescoping)

Court: Supreme Court of India.

Held: Secret profits or undisclosed income of an earlier year may constitute an available 'fund' from which the assessee may later draw to explain cash credits or unexplained expenditure (the basis of 'telescoping'); but the mere availability of such a fund does not in every case imply that no further secret profits were earned in the later year — the burden remains on the Revenue to establish that a disputed amount is income.

Significance: The classic Supreme Court statement of the intangible-additions/telescoping doctrine, frequently invoked in block computation under section 158BB to prevent double taxation of the same undisclosed fund across years of the block.

4. The section 132(4A) presumption is not a substitute for evidence

P. R. Metrani v. CIT (2006) 287 ITR 209 (SC)

Court: Supreme Court of India; judgment dated 15 November 2006 (206 CTR 290 / 157 Taxman 325).

Held: The presumption under section 132(4A) — that seized books/assets belong to the person searched and that their contents are true — is confined to the summary adjudication under section 132(5) and to retention/release of seized assets; it is not available while framing a regular (or block) assessment, though the seized material may be used as evidence in other proceedings.

Significance: Marks the boundary between the search presumption and the assessment; in block assessment the Department must prove undisclosed income on evidence, not on the section 132(4A) presumption alone.

Compiled for the bharattax.co Treatise on the Income-tax Act, 1961 (as amended by the Finance Act, 2026). Statutory text reproduced from the local Act (base text amended up to the Finance Act, 2025), with the publisher's footnote apparatus and amendment-marker brackets removed; three asterisks (***) denote words or a sub-section omitted by amendment. Finance Act, 2026 changes are flagged in the commentary. Citations are stated as reported and have been cross-checked; decisions of the Income-tax Appellate Tribunal and High Courts are identified as such, and decisions rendered under the 1995–2003 Chapter XIV-B or the cognate sections 153A–153C are flagged where relied upon, since the revived sections are not yet judicially construed. Where a section is genuinely sparse of authority, that is stated candidly rather than padded. Not legal advice.