Section 35D: Amortisation of Certain Preliminary Expenses
Eligibility, qualifying costs, deduction limits, five-year write-off, audit requirements and business restructuring under the Income-tax Act, 1961.
Updated 24 October 2026 · India
What is Section 35D?
Section 35D of the Income-tax Act, 1961 provided for amortisation, meaning deduction of specified preliminary expenditure in instalments instead of a single immediate deduction. It applied to an Indian company or a resident person other than a company, subject to the conditions of the section. Expenditure could relate to starting a business, extending an existing undertaking or establishing a new unit.
Deduction period: For expenditure incurred after 31 March 1998, the historical provision generally allowed 20% of qualifying expenditure per year for five successive previous years. Earlier qualifying expenditure was subject to the original ten-year formulation. The deduction starts in the year prescribed by subsection (1), depending on the business event.
Which preliminary expenses qualify under Section 35D(2)?
- Preparation of a feasibility report or project report.
- Market surveys and other surveys necessary for the business.
- Engineering services relating to the business.
- Legal charges for drafting agreements connected with setting up or conducting the business.
- For companies: specified memorandum and articles drafting and printing expenses, registration fees, and specified costs of a public issue of shares or debentures.
- Other prescribed items, subject to the rule against double deductions.
For feasibility reports, project reports, surveys and engineering services, subsection (2)(a) specifies who must carry out the work: the taxpayer or a concern approved for the purpose. Merely calling an expense a startup cost does not make it eligible.
Maximum deduction: Section 35D(3)
For qualifying expenditure incurred after 31 March 1998, the historical upper limit was 5% of the cost of the project. An eligible Indian company could instead elect the statutory 5% of capital employed measure. Expenditure exceeding the applicable ceiling is ignored for calculating the deduction. The older 2.5% threshold applied to earlier expenditure.
Cost of project generally refers to specified fixed assets recorded at the relevant date; capital employed refers to qualifying issued share capital, debentures and long-term borrowings, as defined in the section. The definitions differ for a new business and for expansion or a new unit.
Illustration: calculating the historical five-year deduction
| Particulars | Amount |
|---|---|
| Qualifying preliminary expenditure | Rs. 8,00,000 |
| Cost of project | Rs. 1,00,00,000 |
| 5% of project cost | Rs. 5,00,000 |
| Expenditure considered for deduction | Rs. 5,00,000 |
| Annual deduction for five years | Rs. 1,00,000 |
Illustrative calculation under the historical post-March 1998 rules, assuming all other eligibility conditions are met. It is not a determination of relief under the Income-tax Act, 2025.
Audit, amalgamation, demerger and duplicate deductions
Audit and documentation — subsection (4)
For persons other than companies or co-operative societies, the historical provision prescribed an audit and an accountant's report for the relevant expenditure years. Verify current filing and procedural requirements for the applicable assessment or tax year.
Amalgamation and demerger — subsections (5) and (5A)
Where a qualifying undertaking is transferred under an eligible amalgamation or demerger during the deduction period, the remaining instalments may pass to the amalgamated or resulting company, subject to the section. The transferor is not entitled to claim the instalment for the year of the relevant reorganisation as specified in the provisions.
No double deduction — subsection (6)
Once expenditure is claimed and allowed under Section 35D, it cannot also be deducted under another provision for the same or another assessment year.
Records to retain
Maintain invoices, engagement letters, project reports, board approvals, capital and fixed-asset schedules, evidence of the business commencement or expansion date, audit reports where required, and a year-by-year amortisation schedule.
Original Section 35D text and amendment notes
The following material is retained from the supplied webpage for historical reference. Superscript amendment markers in the original are reproduced as ordinary numbers. Some language may reflect an earlier consolidated version and should be checked against official legislation before relying on it.
1(1) Where an assessee, being an Indian company or a person (other than a company) who is resident in India, incurs, after the 31st day of March, 1970, any expenditure specified in sub-section (2),
(i) before the commencement of his business, or
(ii) after the commencement of his business, in connection with the extension of his 2 undertaking or in connection with his setting up a new 3 unit, the assessee shall, in accordance with and subject to the provisions of this section, be allowed a deduction of an amount equal to one-tenth of such expenditure for each of the ten successive previous years beginning with the previous year in which the business commences or, as the case may be, the previous year in which the extension of the 2 undertaking is completed or the new 3 unit commences production or operation:
4 Provided that where an assessee incurs after the 31st day of March, 1998, any expenditure specified in sub-section (2), the provisions of this sub-section shall have effect as if for the words an amount equal to one-tenth of such expenditure for each of the ten successive previous years, the words an amount equal to one-fifth of such expenditure for each of the five successive previous years had been substituted.
(2) The expenditure referred to in sub-section (1) shall be the expenditure specified in any one or more of the following clauses, namely :
(a) expenditure in connection with
(i) preparation of feasibility report;
(ii) preparation of project report;
(iii) conducting market survey or any other survey necessary for the business of the assessee;
(iv) engineering services relating to the business of the assessee:
Provided that the work in connection with the preparation of the feasibility report or the project report or the conducting of market survey or of any other survey or the engineering services referred to in this clause is carried out by the assessee himself or by a concern which is for the time being approved in this behalf by the Board;
(b) legal charges for drafting any agreement between the assessee and any other person for any purpose relating to the setting up or conduct of the business of the assessee;
(c) where the assessee is a company, also expenditure
(i) by way of legal charges for drafting the Memorandum and Articles of Association of the company;
(ii) on printing of the Memorandum and Articles of Association;
(iii) by way of fees for registering the company under the provisions of the Companies Act, 1956 (1 of 1956);
(iv) in connection with the issue, for public subscription, of shares in or debentures of the company, being underwriting commission, brokerage and charges for drafting, typing, printing and advertisement of the prospectus;
(d) such other items of expenditure (not being expenditure eligible for any allowance or deduction under any other provision of this Act) as may be prescribed.
(3) Where the aggregate amount of the expenditure referred to in sub-section (2) exceeds an amount calculated at two and one-half per cent
(a) of the cost of the project, or
(b) where the assessee is an Indian company, at the option of the company, of the capital employed in the business of the company, the excess shall be ignored for the purpose of computing the deduction allowable under sub-section (1):
5 Provided that where the aggregate amount of expenditure referred to in sub-section (2) is incurred after the 31st day of March, 1998, the provisions of this sub-section shall have effect as if for the words two and one-half per cent, the words five per cent had been substituted.
Explanation. In this sub-section
(a) cost of the project means
(i) in a case referred to in clause (i) of sub-section (1), the actual cost of the fixed assets, being land, buildings, leaseholds, plant, machinery, furniture, fittings and railway sidings (including expenditure on development of land and buildings), which are shown in the books of the assessee as on the last day of the previous year in which the business of the assessee commences;
(ii) in a case referred to in clause (ii) of sub-section (1), the actual cost of the fixed assets, being land, buildings, leaseholds, plant, machinery, furniture, fittings and railway sidings (including expenditure on development of land and buildings), which are shown in the books of the assessee as on the last day of the previous year in which the extension of the 6 undertaking is completed or, as the case may be, the new 7 unit commences production or operation, in so far as such fixed assets have been acquired or developed in connection with the extension of the 8 undertaking or the setting up of the new 7 unit of the assessee;
(b) "capital employed in the business of the company" means-
(i) in a case referred to in clause (i) of sub-section (1), the aggregate of the issued share capital, debentures and long-term borrowings as on the last day of the previous year in which the business of the company commences;
(ii) in a case referred to in clause (ii) of sub-section (1), the aggregate of the issued share capital, debentures and long-term borrowings as on the last day of the previous year in which the extension of the 8 undertaking is completed or, as the case may be, the new 7 unit commences production or operation, in so far as such capital, debentures and long-term borrowings have been issued or obtained in connection with the extension of the 8 undertaking or the setting up of the new 8 unit of the company;
(c) "long-term borrowings" means-
(i) any moneys borrowed by the company from Government or the Industrial Finance Corporation of India or the Industrial Credit and Investment Corporation of India or any other financial institution9 which is eligible for deduction under clause (viii) of sub-section (1) of section 36 or any banking institution (not being a financial institution referred to above), or
(ii) any moneys borrowed or debt incurred by it in a foreign country in respect of the purchase outside India of capital plant and machinery, where the terms under which such moneys are borrowed or the debt is incurred provide for the repayment thereof during a period of not less than seven years.
(4) Where the assessee is a person other than a company or a co-operative society, no deduction shall be admissible under sub-section (1) unless the accounts of the assessee for the year or years in which the expenditure specified in sub-section (2) is incurred have been audited by an accountant as defined in the Explanation below sub-section (2) of section 288, and the assessee furnishes, along with his return of income for the first year in which the deduction under this section is claimed, the report of such audit in the prescribed form duly signed and verified by such accountant and setting forth such particulars as may be prescribed.
(5) Where the undertaking of an Indian company which is entitled to the deduction under sub-section (1) is transferred, before the expiry of the period of ten years specified in sub-section (1), to another Indian company in a scheme of amalgamation,-
(i) no deduction shall be admissible under sub-section (1) in the case of the amalgamating company for the previous year in which the amalgamation takes place; and
(ii) the provisions of this section shall, as far as may be, apply to the amalgamated company as they would have applied to the amalgamating company if the amalgamation had not taken place.
10 (5A) Where the undertaking of an Indian company which is entitled to the deduction under subsection (1) is transferred, before the expiry of the period specified in sub-section (1), to another company in a scheme of demerger,-
(i) no deduction shall be admissible under sub-section (1) in the case of the demerged company for the previous year in which the demerger takes place; and
(ii) the provisions of this section shall, as far as may be, apply to the resulting company, as they would have applied to the demerged company, if the demerger had not taken place.
(6) Where a deduction under this section is claimed and allowed for any assessment year in respect of any expenditure specified in sub-section (2), the expenditure in respect of which deduction is so allowed shall not qualify for deduction under any other provision of this Act for the same or any other assessment year. --------------------
1. Ins. by Act 42 of 1970, s. 8 (w.e.f. 1-4-1971).
2. Subs. by Act 18 of 2008, s. 8, for industrial undertaking (w.e.f. 1-4-2009).
3. Subs. by s. 8, ibid., for industrial unit (w.e.f. 1-4-2009).
4. Ins. by Act 21 of 1998, s. 14 (w.e.f. 1-4-1999).
5. Ins. by Act 21 of 1998, s. 14 (w.e.f. 1-4-1999).
6. Subs. by Act 18 of 2008, s. 8, for industrial undertaking (w.e.f. 1-4-2009).
7. Subs. by Act of 18 of 2008, s. 8, for "industrial unit (w.e.f. 1-4-2009).
8. Subs. by s. 8, ibid., for "industrial undertaking" (w.e.f. 1-4-2009).
9. Subs. by Act 10 of 2000, s. 17, for "which is for the time being approved by the Central Government for the purposes of clause (viii) of sub-section (1) of section 36"(w.e.f. 1-4-2000).
10. Ins. by Act 27 of 1999, s. 19 (w.e.f. 1-4-2000).
Frequently asked questions
What is Section 35D of the Income-tax Act, 1961?
It provides amortisation of specified preliminary expenses incurred by an eligible Indian company or resident non-corporate taxpayer in starting a business, extending an undertaking or setting up a new unit, subject to statutory limits.
How many years are preliminary expenses written off?
For qualifying expenditure incurred after 31 March 1998, the historical rule allows one-fifth in each of five successive previous years, subject to the applicable provisions.
Is every startup expense deductible under Section 35D?
No. Only the prescribed categories of expenditure qualify, and the deduction is restricted by the statutory ceiling and other conditions.
What is the maximum eligible amount?
For qualifying expenditure incurred after 31 March 1998, the historical ceiling was 5% of project cost or, for an Indian company where permitted, 5% of capital employed. Subsequent amendments and the relevant tax year must be checked.
Can the same cost be deducted twice?
No. Subsection (6) prohibits a second deduction under another provision for expenditure already allowed under Section 35D.
Official legislation and tax resources
Consult the Income Tax Department, the India Code legislation database and the e-Gazette of India for statutory text, amendments and applicable notifications. Search the relevant Act and section and verify the effective date before applying any deduction.
