Section 80-I: Deduction for Industrial Undertakings, Ships and Hotels
A practical guide to the historical profit-linked deduction, its eligibility conditions, rates, computation rules and why it is no longer a deduction for newly established businesses.
Reviewed: 10 October 2026
What was Section 80-I?
Section 80-I of the Income-tax Act, 1961 provided a deduction from qualifying profits and gains included in the assessee's gross total income. Under subsection (1), eligible income could arise from an industrial undertaking, a ship, a hotel business or the business of repairing ocean-going vessels or other powered craft. It was a deduction in computing total income, not an exemption for all receipts or a deduction based simply on capital expenditure.
The exact deduction depended on the nature of the business, the taxpayer and the date operations commenced. The historical text and amendments for the relevant assessment year must be consulted when assessing an old claim.
Deduction rates under subsections (1) and (1A)
| Historical category | Deduction from eligible profits |
|---|---|
| General qualifying undertaking under subsection (1) | 20%; generally 25% where the assessee was a company and the specified company proviso applied |
| Qualifying industrial undertaking, ship or hotel commencing on or after 1 April 1990 but before 1 April 1991, under subsection (1A) | 25%; 30% for a company where applicable |
These percentages applied to eligible business profits, not turnover, sales or the total income of every business operated by the assessee.
Deduction period: subsection (5)
Ordinarily, the deduction was available for the initial assessment year and the next seven assessment years (eight years in total). Special historical rules provided nine succeeding years for qualifying co-operative societies, four succeeding years for vessel-repair businesses, and longer periods for certain businesses commencing during 1990-91, including the related co-operative society proviso. The applicable version of subsection (5) determines the precise period.
Eligibility and commencement conditions
Industrial undertakings: subsection (2)
The industrial undertaking generally had to be a genuinely new undertaking, not formed by splitting up or reconstructing an existing business, and not formed by transferring previously used plant or machinery to the new business. It had to manufacture or produce qualifying articles or operate cold storage plants within the historical commencement window, generally within ten years after 31 March 1981, subject to notified extensions. The manufacturing activity ordinarily had to employ at least ten workers when using power, or twenty workers without power.
The statute contained important exceptions: revival of certain businesses under section 33B; conditions allowing imported second-hand machinery that had not previously been used in India; and a deeming rule permitting transferred used machinery where its value did not exceed 20% of the total plant and machinery value. Small-scale industrial undertakings had a specific relaxation relating to the Eleventh Schedule restriction.
Ships: subsection (3)
The ship had to be owned by an Indian company, wholly used for its business, not previously owned or used in Indian territorial waters by an Indian resident, and first brought into use within the prescribed historical period following 1 April 1981.
Hotels: subsection (4)
The hotel business had to meet restrictions on reconstruction and previously used buildings, machinery and plant. It had to be owned and carried on by an Indian-registered company with paid-up capital of at least Rs. 5 lakh, hold the prescribed Central Government approval, and have started functioning after 31 March 1981 but before 1 April 1991.
Repairs to ocean-going vessels: subsection (4A)
The vessel-repair business had to be carried on by an Indian company, meet the new-business and used-machinery restrictions, have commenced repairs after 31 March 1983 but before 1 April 1988, and hold the required Central Government approval.
How the deduction was calculated and controlled
Subsection (6): eligible business treated as the only source
For subsequent deduction years, eligible profits were determined on the statutory assumption that the undertaking, ship, hotel or repair business was the assessee's only source of income during the relevant period. This special computation rule matters particularly for losses and depreciation attributable to the eligible activity.
Subsection (7): audit report
Where the assessee was neither a company nor a co-operative society, the specified industrial-undertaking deduction required audited accounts and the prescribed accountant's report. Historical filing requirements must be read as they applied to the relevant assessment year.
Subsection (8): inter-business transfers at market value
Where goods moved between an eligible business and another business of the same assessee at a recorded consideration different from market value, the eligible profits had to be adjusted using market value. The Assessing Officer could apply a reasonable basis if the statutory method caused exceptional difficulties.
Subsection (9): excessive profits from connected persons
Where a close connection or other arrangement artificially produced more than ordinary profits, the Assessing Officer could recompute the amount reasonably attributable to the eligible business.
Subsection (10): notified exclusion
The Central Government could, after inquiry, notify classes of industrial undertakings to which the section's benefit would not apply from the specified date.
Does Section 80-I apply in 2026?
For newly commenced activities, no. The operative entry periods under this historical incentive closed decades ago, and even the extended deduction periods have run their course. The section can still be relevant to old assessments, reassessment proceedings, appeals and disputes concerning a past assessment year.
For historical cases, verify the law as applicable to that assessment year, the original commencement date, relevant approvals, business accounts, employee records, machinery acquisition documents and the prescribed audit report. Do not assume that section 80-I, section 80-IA and section 80-IB are interchangeable.
India's Income-tax Act, 2025 took effect from 1 April 2026. References on this page to section 80-I describe the earlier Income-tax Act, 1961 and should be read in the context of historical tax years and applicable transition provisions.
Official legal resources
For statutory wording and amendments, consult the India Code legislative database, the Income Tax Department's official website and the Income Tax e-Filing Portal.
Frequently asked questions
Can a new industrial unit claim section 80-I in 2026?
No. Section 80-I relates to historical qualifying commencement periods. A new unit must examine other applicable provisions rather than claim this expired incentive.
Was the section 80-I deduction calculated on turnover?
No. It was calculated as a prescribed percentage of qualifying profits and gains, subject to the statutory computation rules.
How long did the deduction last?
The general period was eight assessment years including the initial year, with special extended or shorter periods for certain categories.
Are section 80-I and section 80-IB the same?
No. They are separate provisions with different eligibility criteria, commencement periods and deduction rules.