Income Tax Law · Block Assessment

Section 158BF of the Income-tax Act: Interest and Penalty Relief in Block Assessments

Updated: 26 October 2026

Section 158BF provides that specified interest and penalty provisions do not apply to undisclosed income assessed or reassessed for a block period. The protection is specific: it does not eliminate the tax liability or separate interest and penalty consequences under the special block assessment rules.

Current legal position: The Income-tax Act, 2025 came into effect on 1 April 2026. Its corresponding provision is Section 297. Section 158BF of the Income-tax Act, 1961 remains relevant to matters governed by the earlier legislation, subject to the repeal and savings provisions and applicable transitional rules.

On this page:
Statutory provision Meaning and scope Exceptions 2025 Act Official sources

1. Section 158BF: Statutory provision

The revised text of Section 158BF, as reintroduced in Chapter XIV-B by the Finance (No. 2) Act, 2024, reads:

No interest under section 234A, 234B or 234C or penalty under section 270A shall be levied or imposed upon the assessee in respect of the undisclosed income assessed or reassessed for the block period.

See the Income Tax Department's official Section 158BF text and the Income-tax Act, 1961 as amended by the Finance Act, 2025.

2. Meaning and scope of the relief

Chapter XIV-B establishes a special assessment mechanism for undisclosed income detected following a search under Section 132 or requisition under Section 132A, initiated on or after 1 September 2024 under the 1961 Act framework. The block period and undisclosed income are defined in Section 158B; computation and procedure are governed principally by Sections 158BB and 158BC.

Provision under the 1961 Act	Subject	Effect of Section 158BF
Section 234A	Interest for default in furnishing an income-tax return	Not levied on the specified block-period undisclosed income
Section 234B	Interest for default in payment of advance tax	Not levied on the specified block-period undisclosed income
Section 234C	Interest for deferment of advance tax instalments	Not levied on the specified block-period undisclosed income
Section 270A	Penalty for under-reporting or misreporting of income	Not imposed in respect of that undisclosed income

The relief is limited to the identified provisions and income. It should not be read as an exemption for unrelated regular income, or as immunity from every penalty under the Act.

3. Section 158BFA: Special interest and penalties may still apply

Section 158BF must be read with Section 158BFA, which separately addresses failure to furnish a block return within the time specified in the notice and penalties arising in block assessment proceedings.

Delayed or missing block return: Section 158BFA(1) under the 1961 Act prescribes simple interest at 1.5% per month or part of a month on the prescribed tax amount for the statutory period, where applicable.
Penalty on undisclosed income: Section 158BFA(2) provides for a penalty equal to 50% of the relevant tax, subject to the statutory conditions and exceptions.
Conditions for protection: The first proviso to Section 158BFA(2) addresses timely filing of the block return, payment of tax, evidence of payment and non-appeal against the declared portion. Any undisclosed income determined in excess of the return remains subject to the applicable rule.

Refer to the official Section 158BFA and the Income Tax Department's block assessment guidance.

4. Earlier wording of Section 158BF

Before the 2024 reintroduction of Chapter XIV-B, the historical text excluded interest under Sections 234A, 234B and 234C and penalties under Section 271(1)(c), Section 271A and Section 271B in respect of undisclosed income determined in the block assessment. That older wording is relevant to the former search assessment regime and should not be confused with the revised provision referring to Section 270A.

Historical wording: Income Tax Department archive of Section 158BF.

5. Corresponding provision under the Income-tax Act, 2025

Section 297 of the Income-tax Act, 2025 addresses the same subject. It refers to interest under Sections 423, 424 and 425 and penalty under Section 439 for undisclosed income assessed or reassessed for the block period. The new numbering should be used for matters governed by the 2025 Act, while the governing assessment period, transitional rules and savings provisions must be checked in each case.

The exemption does not itself cancel any independent interest or penalty prescribed for block assessments under the applicable law.

6. Frequently asked questions

Does Section 158BF waive tax on undisclosed income?

No. It restricts specified interest and penalty levies, not the underlying tax on undisclosed income.

Does it prevent interest under Section 158BFA?

No. Section 158BFA is a distinct special provision that may apply when a block return is not furnished within the prescribed time.

Is Section 158BF still the correct citation after 1 April 2026?

For matters governed by the Income-tax Act, 2025, refer to Section 297. For earlier matters, Section 158BF may remain material under applicable savings and transition rules.

7. Official legal references

This article provides general legal information. The applicable enactment and statutory text should be verified for the relevant assessment period.