Section 301 of the Income-tax Act, 2025 — Block Assessment Definitions (Block Period & Undisclosed Income)

In plain language

What Section 301 actually is

Section 301 is the "interpretation" (definitions) clause of the block-assessment chapter of the Income-tax Act, 2025 (the chapter dealing with assessment of search and requisition cases, comprising roughly Sections 292 to 301). It does not by itself levy tax or create a procedure. Instead, it is the dictionary for the whole chapter — it tells you the exact meaning of the special terms used when the Income-tax Department raids a person under a search (equivalent of old Section 132) or seizes assets under a requisition (old Section 132A). Because block assessment carries a very high 60% tax and a heavy penalty, the precise definitions in Section 301 decide how many years get reopened and what income can be taxed.

1961-Act equivalent: Section 301 corresponds to Section 158B of the Income-tax Act, 1961, which similarly defined "block period" and "undisclosed income" for Chapter XIV-B.

The key terms Section 301 defines

• Block period — the bundle of years the Assessing Officer can assess in one combined order. Per Section 301, it is the six tax years immediately preceding the tax year in which the search is initiated or requisition is made, plus the broken part of the current year from 1 April up to the date the last search authorisation is executed. In effect, roughly six-and-a-fraction years are pulled into a single assessment.
• Undisclosed income — income, or assets representing income, that the taxpayer has not disclosed or would not have disclosed for tax. This covers unrecorded money, bullion, jewellery, and Virtual Digital Assets (VDAs/crypto — added with effect from 1 February 2025), any entry in books that is false, and any wrongly claimed expense, deduction, allowance or exemption.
• Other machinery expressions used across the chapter (such as references to the search/requisition trigger and the person searched) take the meaning assigned in this interpretation section, read with the general definitions in Section 2 of the Act.

Who it applies to

• Any person on whom a search is carried out under the search provisions, or whose assets are requisitioned.
• A third person — where the AO is satisfied that undisclosed income found in the search belongs to someone other than the searched person, block assessment (and hence these definitions) extends to that other person.
• Individuals, HUFs, firms, companies, LLPs — there is no exemption by status; what matters is that a search/requisition has occurred.

How it interacts with the rest of the chapter

• Section 294 uses the "block period" definition to tell the taxpayer which years to declare in the special block return (to be filed within up to 60 days of notice).
• Section 293 computes the "total undisclosed income of the block period" — impossible to apply without the Section 301 meaning of undisclosed income.
• Section 296 sets the time-limit (12 months from the end of the quarter of the last authorisation) for completing the order.
• The Finance Act fixes the tax at a flat 60% on the total undisclosed income, plus surcharge/cess, with a penalty of 50% of that tax (waivable if the taxpayer admits the income in the block return, pays the tax and does not appeal).

Practical implications for a taxpayer

• Because "block period" reaches back six years plus the current broken period, keeping clean records and proof of source for at least seven years is essential.
• Only undisclosed income is taxed under this chapter at 60% — income already shown in filed returns stays under normal assessment and normal slab rates. Correctly classifying income as disclosed vs undisclosed is therefore hugely valuable.
• Crypto/VDA holders should note that unexplained digital assets now squarely fall within "undisclosed income" and attract the 60% regime.
• Honest disclosure in the block return, with full payment and no appeal, can eliminate the 50% penalty — a strong incentive to cooperate.