Section 42 of the Income-tax Act, 1961: Special Deductions for Mineral Oil Exploration
Section 42 provided agreement-based tax deductions for qualifying businesses engaged in prospecting, extracting or producing mineral oils, including petroleum and natural gas. This guide explains eligibility, deductible expenditure, transfers of business interests and the corresponding provision under the Income-tax Act, 2025.
1. Who qualified under Section 42(1)?
The business must involve prospecting for, extraction of or production of mineral oils. The Central Government must have entered into an agreement for its participation or that of an authorised person, and the agreement must have been laid before each House of Parliament. The specified allowances depend on the terms of that agreement; they are not automatic deductions for every oil and gas operator.
2. Allowances under Section 42(1)(a), (b) and (c)
Section 42(1)(a): Abortive exploration
Expenditure on unsuccessful or infructuous exploration relating to an area surrendered before commercial production may qualify for the agreement-specified deduction.
Section 42(1)(b): Drilling and exploration expenditure
After commercial production begins, qualifying expenses incurred before or after that date for drilling, exploration activities, related services and connected physical assets may be allowed according to the agreement. For agreements entered into after 31 March 1981, the statutory proviso modifies the reference to assets eligible for depreciation under Section 32.
Section 42(1)(c): Depletion allowance
An allowance for depletion of mineral oil in the mining area may apply in the year commercial production starts and in succeeding years specified in the agreement. The calculation and duration are controlled by the agreement.
These allowances can operate in lieu of or in addition to ordinary deductions under the Act, as the qualifying agreement specifies.
3. Section 42(2): Transfer of an oil and gas business or interest
Where a qualifying petroleum or natural gas business, or an interest in it, is transferred in accordance with the agreement, the treatment of remaining unallowed expenditure depends on the capital proceeds received.
- Proceeds below unallowed expenditure: The shortfall can generally be deducted in the year of transfer, subject to the statutory conditions.
- Proceeds above unallowed expenditure: A recapture amount may be taxable as business profits, subject to the statutory cap based on previously allowed expenditure.
- Proceeds at least equal to unallowed expenditure: The unallowed expenditure is not deductible in the transfer year or later years, subject to the specific operation of the provision.
The section also contains special rules for qualifying amalgamations and demergers involving an Indian amalgamated or resulting company, under which the tax treatment generally continues with the successor rather than applying to the transferor.
4. Important legal definitions
- Mineral oil: The explanation to Section 42 expressly includes petroleum and natural gas.
- Prospecting: Exploration activity intended to discover or evaluate mineral oil resources.
- Abortive or infructuous exploration: Exploration that does not yield commercially useful results, in the statutory context of surrendered areas.
- Commercial production: The operational commencement of production, a milestone relevant to the timing of deductions.
- Unallowed expenditure: Qualifying expenditure for which tax deduction has not yet been granted.
5. Section 54 of the Income-tax Act, 2025
Section 54 of the new Act sets out deductions for a specified oil exploration business. It defines the agreement conditions, identifies abortive exploration, drilling and exploration expenses and depletion allowances, and prescribes transfer-related deductions or taxable profits. For a transfer, the provision uses capital transfer proceeds, total qualifying expenditure and remaining unallowed expenditure in its computation.
For transactions and tax years governed by the new Act, refer to the actual text of Section 54 of the Income-tax Act, 2025 (official PDF). Do not confuse it with Section 51 of that Act, which concerns certain other minerals.
6. Practical example
Assume a qualifying oil exploration agreement permits a deduction for exploration expenditure on a surrendered block. If the operator spends Rs. 2 crore on an unsuccessful exploration programme and surrenders that area before commercial production, the expenditure may fall within the category described in Section 42(1)(a). The amount and timing actually deductible depend on the approved agreement and the applicable law; this example does not establish automatic entitlement.
7. Original Section 42 text and amendment history
The following historical material is retained from the earlier webpage for reference. Footnote numbers and amendment notes reflect the original source and should not be treated as a current consolidated legislative text.
1 (1) For the purpose of computing the profits or gains of any business consisting of the prospecting for or extraction or production of mineral oils in relation to which the Central Government has entered into an agreement with any person for the 2 association or participation of the Central Government or any person authorised by it in such business (which agreement has been laid on the Table of each House of Parliament), there shall be made in lieu of, or in addition to, the allowances admissible under this Act, such allowances as are specified in the agreement in relation-
(a) to expenditure by way of infructuous or abortive exploration expenses in respect of any area surrendered prior to the beginning of commercial production by the assessee;
(b) after the beginning of commercial production, to expenditure incurred by
the assessee, whether before or after such commercial production, in respect of
drilling or exploration activities or services or in respect of physical assets
used in that connection, except assets on which allowance for depreciation is
admissible under section 32: 3 ***
4 Provided that in relation to any agreement entered into after the 31st day of
March, 1981, this clause shall have effect subject to the modification that the
words and figures "except assets on which allowance for depreciation is
admissible under section 32" had been omitted; and
(c) to the depletion of mineral oil in the mining area in respect of the assessment year relevant to the previous year in which commercial production is begun and for such succeeding year or years as may be specified in the agreement;
and such allowances shall be computed and made in the manner specified in the agreement, the other provisions of this Act being deemed for this purpose to have been modified to the extent necessary to give effect to the terms of the agreement.
5 (2) Where the business of the assessee consisting of the prospecting for or extraction or production of petroleum and natural gas is transferred wholly or partly or any interest in such business is transferred in accordance with the agreement referred to in sub-section (1), subject to the provisions of the said agreement and where the proceeds of the transfer (so far as they consist of capital sums)-
(a) are less than the expenditure incurred remaining unallowed, a deduction equal to such expenditure remaining unallowed, as reduced by the proceeds of transfer, shall be allowed in respect of the previous year in which such business or interest, as the case may be, is transferred;
(b) exceed the amount of the expenditure incurred remaining unallowed, so much of the excess as does not exceed the difference between the expenditure incurred in connection with the business or to obtain interest therein and the amount of such expenditure remaining unallowed, shall be chargeable to income-tax as profits and gains of the business in the previous year in which the business or interest therein, whether wholly or partly, had been transferred:
Provided that in a case where the provisions of this clause do not apply, the deduction to be allowed for expenditure incurred remaining unallowed shall be arrived at by subtracting the proceeds of transfer (so far as they consist of capital sums) from the expenditure remaining unallowed.
Explanation.-Where the business or interest in such business is transferred in a previous year in which such business carried on by the assessee is no longer in existence, the provisions of this clause shall apply as if the business is in existence in that previous year;
(c) are not less than the amount of the expenditure incurred remaining unallowed, no deduction for such expenditure shall be allowed in respect of the previous year in which the business or interest in such business is transferred or in respect of any subsequent year or years:
6 Provided that where in a scheme of amalgamation or demerger, the amalgamating or the demerged company sells or otherwise transfers the business to the amalgamated or the resulting company (being an Indian company), the provisions of this sub-section-
(i) shall not apply in the case of the amalgamating or the demerged company; and
(ii) shall, as far as may be, apply to the amalgamated or the resulting company as they would have applied to the amalgamating or the demerged company if the latter had not transferred the business or interest in the business.
7 Explanation.-For the purposes of this section, "mineral oil" includes
petroleum and natural gas.
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1. Section 42 renumbered as sub-section (1) thereof by Act 21 of 1998, s. 17
(w.e.f. 1-4-1999).
2. Subs. by Act 16 of 1981, s. 8, for "the association or participation in such
business of the Central Government" (w.e.f. 1-4-1981).
3. The word "and" omitted bys. 8, ibid.(w.e.f. 1-4-1981).
4. Ins. by s. 8, ibid. (w.e.f. 1-4-1981).
5. Ins. by Act 21 of 1998, s. 17 (w.e.f. 1-4-1999).
6. Subs. by Act 27 of 1999, s. 25, for "the proviso" (w.e.f. 1-4-2000).
7. Ins. by Act 16 of 1981, s. 8 (w.e.f. 1-4-1981).
8. Official legislation and guidance
- Income-tax Act, 1961 - official consolidated PDF (2024 edition)
- Income Tax Department - Section 42 (historical 1961 Act text)
- Income-tax Act, 2025 - official text, Section 54
- Income Tax Department - Business or profession guidance
Disclaimer: This article provides general legal and tax information. Check the governing agreement, relevant tax year, amendments, rules and official statutory text before claiming a deduction.