Section 51 explained: this guide covers what it means, who it applies to, the step-by-step process, documents required, fees, due dates and penalties in India — so you can stay compliant with confidence and avoid costly mistakes.
Section 51 lets an Indian company or a resident person who prospects for, extracts or produces a listed mineral deduct one-tenth of the prospecting and development expenditure in each of ten tax years, starting with the year of commercial production. Schedule XII lists the minerals (Part A) and groups of associated minerals (Part B). This article explains the section and the Schedule as per the Income-tax Act, 2025 (30 of 2025) as amended by the Finance Act, 2026, which amended Schedule XII by section 128 of that Act.
Expenditure incurred wholly and exclusively on prospecting for, or developing a mine of, a mineral in Schedule XII, in the year of commercial production and the four tax years before it, is deducted at one-tenth a year over the ten tax years beginning with the year of commercial production. The deduction in a year is the lesser of the instalment and the income from commercial exploitation; any unallowed part is carried forward, but not beyond the tenth tax year. Expenditure on acquiring a site or deposits, and depreciable capital items, are excluded.
Where this section sits
Section 51 follows sections 47 to 50, in the article on those sections, and is followed by section 52 in its own article. The audit date it refers to is that of section 63, in our post on Section 63. If your business is in mining or exploration, our tax planning advisory team can help plan the claim.
Section 51(1) and (2): who and what
An assessee, being an Indian company or a person (other than a company) who is resident in India, engaged in any operations relating to prospecting for, or extraction or production of, any mineral, is allowed a deduction of one-tenth of the expenditure in sub-section (2), in each of the relevant tax years.
The expenditure in sub-section (2) is that incurred by the assessee at any time during the year of commercial production and any one or more of the four tax years immediately preceding that year, wholly and exclusively on:
- operations relating to prospecting for any mineral or group of associated minerals specified in Part A or Part B of Schedule XII; or
- the development of a mine or other natural deposit of any such mineral or group.
Section 51(3) and (4): reductions and exclusions
Reductions (3): the expenditure is reduced by the expenditure met directly or indirectly by any other person or authority, and any sale, salvage, compensation or insurance moneys realised in respect of property or rights brought into existence by the expenditure.
Exclusions (4): the following are left out of the expenditure:
- (a) acquisition of the site of the source of the mineral or group, or any rights in or over the site;
- (b) acquisition of the deposits, or any rights in or over them; or
- (c) capital expenditure on building, machinery, plant or furniture for which depreciation is admissible under section 33.
Section 51(5) and (6): the yearly amount and carry forward
The deduction for any relevant tax year is the lesser of:
- (a) one-tenth of the expenditure in (2) as reduced by (3) and (4) (the "instalment"); or
- (b) such amount as is sufficient to reduce to nil the income (computed before this deduction) of that tax year arising from the commercial exploitation of the mine or deposit of the mineral, or any of the minerals in a group, for which the expenditure was incurred (whether or not the exploitation results from the operations or development in (2) and (3)).
If any part of the instalment is not fully allowed, it is carried forward to the next tax year and becomes part of that year's instalment, and so on, but no instalment is carried forward beyond the tenth tax year from the tax year in which commercial production began (sub-section (6)).
Worked example: yearly deduction and carry forward
Granite Ridge Pvt Ltd (an invented company) incurs Rs. 50,00,000 on prospecting and mine development within the permitted years. Rs. 5,00,000 was met by another authority, Rs. 5,00,000 was realised as salvage, and Rs. 10,00,000 was capital expenditure on depreciable plant. The expenditure counted is 50,00,000 minus 5,00,000 minus 5,00,000 minus 10,00,000 = Rs. 30,00,000. The instalment is one-tenth: Rs. 3,00,000.
- First relevant tax year: the income from commercial exploitation before this deduction is Rs. 2,00,000. The deduction is the lesser of Rs. 3,00,000 and Rs. 2,00,000, so Rs. 2,00,000. Rs. 1,00,000 (3,00,000 minus 2,00,000) is carried forward.
- Second relevant tax year: the instalment is Rs. 3,00,000 plus the carried-forward Rs. 1,00,000, which is Rs. 4,00,000. The deduction is the lesser of that and the income from exploitation of that year.
The carry forward cannot go beyond the tenth tax year from the year commercial production began.
Section 51(7): audit for non-companies
Where the assessee is a person other than a company or a co-operative society, no deduction is admissible unless:
- (a) the accounts for the tax year or years in which the expenditure was incurred have been audited by an accountant before the specified date referred to in section 63; and
- (b) the assessee furnishes, for the first tax year in which the deduction is claimed, the audit report by such date, in such form, duly signed and verified, as may be prescribed.
The detail of the form and date is left to the Income-tax Rules, 2026.
Section 51(8) and (9): mergers, demergers and double deduction
- (8) If an undertaking of an Indian company entitled to the deduction is transferred before the ten years end in a scheme of amalgamation or demerger to another Indian company, no deduction is allowed to the amalgamating or demerged company for the year of the scheme, and the section continues to apply to the amalgamated or resulting company as if the scheme had not taken place.
- (9) Once a deduction under section 51 is claimed and allowed, no deduction for the same expenditure is allowed under any other provision for the same or any other tax year.
Section 51(10): definitions
| Term | Meaning |
|---|---|
| Operation relating to prospecting | Any operation undertaken to explore, locate or prove deposits of any mineral, including an operation that proves infructuous or abortive |
| Year of commercial production | The tax year in which, as a result of an operation relating to prospecting, commercial production of any mineral, or of any one or more minerals in a group of associated minerals in Part A or Part B of Schedule XII, commences |
| Relevant tax years | The ten tax years beginning with the year of commercial production |
Schedule XII: minerals and groups of associated minerals
Schedule XII is headed with the words "See section 51" and has two Parts.
Part A: minerals
Part A lists minerals by serial number. The list as printed:
| Serial numbers | Minerals |
|---|---|
| 1 to 7 | Aluminium ores; apatite and phosphatic ores; beryl; chrome ore; coal and lignite; columbite, samarskite and other minerals of the "rare earths" group; copper |
| 8 to 14 | Gold; gypsum; iron ore; lead; manganese ore; molybdenum; nickel ores |
| 15 to 21 | Platinum and other precious metals and their ores; pitchblende and other uranium ores; precious stones; rutile; silver; sulphur and its ores; tin |
| 22 to 27 | Tungsten ores; uraniferous allanite, monazite and other thorium minerals; uranium bearing tailings left over from ores after extraction of copper and gold, ilmenite and other titanium ores; vanadium ores; zinc; zircon |
| 28 to 36 | Beryllium bearing minerals; glauconite; graphite; indium bearing minerals; lithium bearing minerals; niobium bearing minerals; potash; rhenium bearing minerals; tantalum bearing minerals |
Finance Act, 2026. Serial numbers 28 to 36 are printed within square brackets with a footnote reading "Inserted by the Finance Act, 2026, w.e.f. 1-4-2026". The footnote itself is printed at a page break lower down, after serial number 15 of Part B; the mark at serial number 28 shows that it belongs to the bracketed items.
Part B: groups of associated minerals
Part B lists sixteen groups. Each group is a set of minerals found together:
| Serial number | Group |
|---|---|
| 1 | Apatite, beryl, cassiterite, columbite, emerald, felspar, lepidolite, mica, pitchblende, quartz, samarskite, scheelite, topaz, tantalite, tourmaline |
| 2 | Iron, manganese, titanium, vanadium and nickel minerals |
| 3 | Lead, zinc, copper, cadmium, arsenic, antimony, bismuth, cobalt, nickel, molybdenum and uranium minerals, and gold and silver, arsenopyrite, chalcopyrite, pyrite, pyrrhotite and pentlandite |
| 4 | Chromium, osmiridium, platinum and nickel minerals |
| 5 | Kyanite, sillimanite, corundum, dumortierite and topaz |
| 6 | Gold, silver, tellurium, selenium and pyrite |
| 7 | Barytes, fluorite, chalcocite, selenium, and minerals of zinc, lead and silver |
| 8 | Tin and tungsten minerals |
| 9 | Limestone, dolomite and magnesite |
| 10 | Ilmenite, monazite, zircon, rutile, garnet and sillimanite |
| 11 | Sulphides of copper and iron |
| 12 | Coal, fire clay and shale |
| 13 | Magnetite and apatite |
| 14 | Magnesite and chromite |
| 15 | Talc (soapstone and steatite) and dolomite |
| 16 | Bauxite, laterite, aluminous clays, lithomarge, titanium, vanadium, gallium and columbium minerals |
Need help with mining and exploration costs?
Whether a mineral is in Schedule XII, which years of expenditure count and how the instalment is carried forward are points to settle with the accounts in hand. For planning, see our tax planning advisory service.
Key takeaways
- One-tenth of qualifying prospecting and development expenditure is deductible in each of ten tax years from the year of commercial production.
- The expenditure window is the year of commercial production and the four tax years before it.
- The yearly deduction is the lesser of the instalment and the income from exploitation; the shortfall is carried forward up to the tenth tax year.
- Site, deposit and depreciable capital costs are excluded.
- Non-companies need an audit by an accountant and an audit report.
- Schedule XII Part A serial numbers 28 to 36 were inserted by the Finance Act, 2026.
Read next
- Sections 47 to 50: agricultural extension, development accounts, Site Restoration Fund and trade associations
- Section 52: amortisation of telecom licence, amalgamation, demerger and voluntary retirement expenditure
- Section 63: tax audit
- Section 33: depreciation
Disclaimer: Based on the Income-tax Act, 2025 (30 of 2025) as amended by the Finance Act, 2026, as consulted on 2 October 2026. It explains the words of the Act only; the Income-tax Rules, 2026, notifications, circulars, later amendments and the way the tax authorities and courts apply these provisions should be checked. This article is general information, not legal advice; check the official text before acting.