Section 34 of the Income-tax Act, 2025 allows expenditure laid out wholly and exclusively for business or profession, if it is not capital or personal. It disallows expenditure for offences or prohibited purposes, corporate social responsibility spending, and advertising in political party publications.
What section 34 does
Section 34 is the catch-all business deduction — the successor to section 37 of the Income-tax Act, 1961. Everything that is not specifically allowed by sections 28 to 33 or 44 to 52 comes here, provided it clears three filters: not capital, not personal, and wholly and exclusively for the purposes of the business or profession.
Sub-section (2) then carves out three categories outright: offences and prohibited purposes, corporate social responsibility spending under section 135 of the Companies Act, 2013, and advertising in a political party's souvenir, brochure, tract or pamphlet.
Sub-section (3) is where the section has real teeth. It expands the 'offence or prohibited by law' category to cover conduct in or outside India, benefits or perquisites whose acceptance violates a rule governing the recipient, compounding of offences, and settling proceedings for contraventions under notified laws.
The Income-tax Act, 2025 takes effect from 1 April 2026 and applies from tax year 2026-27. The Income-tax Act, 1961 continues to govern every year up to 31 March 2026, including assessments, appeals and penalties for those years, because of the repeal and savings provision in section 536. Figures quoted here are the amounts written into the Act as enacted (with the Gazette corrigenda of 3 September 2025); the annual Finance Act can change rates and thresholds.
Old Act and new Act, side by side
The table below shows what the Income-tax Act, 1961 did and where the same ground is covered in the Income-tax Act, 2025.
| Income-tax Act, 1961 | What it did | Income-tax Act, 2025 |
|---|---|---|
| 37(1) | General deduction for business expenditure | 34(1) |
| 37(1), Explanation 1 | Offence or prohibited by law | 34(2)(a) with 34(3)(a) |
| 37(1), Explanation 2 | CSR expenditure disallowed | 34(2)(b) |
| 37(2B) | Political souvenir advertising disallowed | 34(2)(c) |
| 37(1), Explanation 3 | Foreign law offences, freebies, compounding, settlement | 34(3) |
Section 34 sub-section by sub-section
Read this alongside the bare text — each heading below is a sub-section of the section as enacted.
Sub-section (1) — the general deduction and its three filters
Any expenditure laid out or expended wholly and exclusively for the purposes of the business or profession is allowed, provided it is not of a nature specified in sections 28 to 33, 44 to 49, 51 and 52, and is not capital expenditure or personal expenses. The exclusion list matters: if a specific section deals with the expenditure, that section governs and section 34 does not apply.
Sub-section (2) — the three outright disallowances
Expenditure is not treated as laid out wholly and exclusively for business where it is incurred: (a) for any purpose which is an offence or is prohibited by law; (b) on activities relating to corporate social responsibility referred to in section 135 of the Companies Act, 2013; or (c) on advertisement in any souvenir, brochure, tract, pamphlet or the like published by a political party.
Sub-section (3) — how far 'offence or prohibited by law' reaches
This sub-section expands clause (2)(a) to include expenditure for: any purpose that is an offence under, or prohibited by, any law in force in or outside India; providing a benefit or perquisite in any form to a person — whether or not that person carries on a business or profession — where acceptance by that person violates any law, rule, regulation or guideline governing their conduct; compounding an offence under any law in or outside India; and settling proceedings initiated for contravention under any law notified by the Central Government.
Worked example
A pharmaceutical company's profit and loss account for tax year 2026-27 includes the following.
| Expenditure | Amount | Allowed under section 34? |
|---|---|---|
| Field staff salaries and travel | ₹4,20,00,000 | Yes — wholly and exclusively for business |
| Gifts and sponsored foreign travel for prescribing doctors | ₹65,00,000 | No — sub-section (3)(b): acceptance violates the code governing the doctors' conduct |
| CSR spend on a rural school under section 135 of the Companies Act | ₹80,00,000 | No — sub-section (2)(b) |
| Advertisement in a political party's annual souvenir | ₹5,00,000 | No — sub-section (2)(c) |
| Penalty for delayed environmental clearance compliance | ₹12,00,000 | No — sub-section (2)(a) |
| Fee for compounding an offence under a State pollution law | ₹3,00,000 | No — sub-section (3)(c) |
| Ordinary trade discount to distributors | ₹1,10,00,000 | Yes — a commercial term, not a prohibited benefit |
Of ₹6,95,00,000 debited, ₹1,65,00,000 is disallowed. The freebies disallowance under sub-section (3)(b) does not depend on the doctors carrying on a business — the test is whether acceptance breaches the rules governing their conduct. Note also that CSR spending remains disallowed even though it is legally mandatory.
Compliance checklist and due dates
- Check first whether a specific section (28 to 33, 44 to 49, 51, 52) covers the expenditure; section 34 applies only if none does.
- Keep CSR expenditure in a separate ledger — it is disallowed under sub-section (2)(b) even though the Companies Act mandates it.
- Review marketing and relationship spending against sub-section (3)(b): the test is whether the recipient's code of conduct bars acceptance.
- Segregate fines, penalties, compounding fees and settlement payments; all fall within sub-sections (2)(a) and (3).
- Apply the offence test to foreign laws too — sub-section (3)(a) covers laws in force outside India.
- Do not claim personal or capital expenditure here; sub-section (1) excludes both.
Common mistakes
- Claiming CSR as a business deduction because it is statutorily required. It is expressly disallowed.
- Assuming freebies are allowable where the recipient is not in business. Sub-section (3)(b) applies whether or not they carry on a business or profession.
- Treating compounding fees as a normal business cost. Sub-section (3)(c) disallows them.
- Overlooking foreign-law contraventions on the view that only Indian law matters.
- Using section 34 for expenditure that a specific section already governs, which can lead to the deduction being disallowed under both.
This is an explanatory guide, not tax advice, and it does not reproduce the section in full. Read the bare text of the section before you rely on it, and check for later amendments, the Income-tax Rules made under the new Act, and CBDT circulars and notifications.