Imagine you run a business and it makes a loss this year. Can you just forget about it? No — the tax law lets you carry that loss forward and use it to reduce your future business profits. That's exactly what Section 72 is about: a lifeline for business losses that couldn't be fully absorbed in the current year.
Here's how it works in sequence. First, when you have a non-speculative business loss, you try to set it off against other income heads (salary, house property, etc.) under Section 71 — same year, same return. Whatever loss is still left over after that exercise gets carried forward under Section 72. Once carried forward, the rule changes: that leftover loss can only be set off against profits and gains of any business or profession in a future year. You cannot use a carried-forward business loss against your salary or capital gains income. This restriction is the most exam-tested part of this section.
The time limit is 8 assessment years from the year the loss was first computed. Miss that window and the loss lapses forever. One crucial trap: to carry forward, you must file your ITR by the due date under Section 139(1) — this requirement comes from Section 80, but it's tested alongside Section 72 constantly. Also note, unabsorbed depreciation (Section 32) and scientific research expenditure (Section 35) get set off after the business loss under Section 72 — meaning business losses have priority. There's a special proviso for businesses discontinued due to circumstances covered in Section 33B (like floods, riots) — if revived within 3 years, the attributable loss can still be carried forward, but only for 7 years from revival, not 8. For exam purposes, focus on the standard 8-year rule — the Section 33B proviso is rarely tested at Inter level.
Example 1 — Standard carry forward and set-off
Mr. Sharma has the following income for AY 2024-25:
- Business loss: ₹8,00,000
- Salary income: ₹3,00,000
Step 1 — Inter-head set-off (Section 71, same year):
Salary ₹3,00,000 − Business loss ₹3,00,000 = ₹0 taxable income
Loss still unabsorbed = ₹8,00,000 − ₹3,00,000 = ₹5,00,000 carried forward
AY 2025-26 — Mr. Sharma earns:
- Business profit: ₹6,00,000
- Salary: ₹4,00,000
Step 2 — Set off carried-forward loss (Section 72):
The ₹5,00,000 c/f loss can only be set off against business profit.
Business taxable = ₹6,00,000 − ₹5,00,000 = ₹1,00,000
Salary ₹4,00,000 remains fully taxable — the c/f loss cannot touch it.
Final taxable income AY 2025-26 = ₹5,00,000
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Example 2 — 8-year limit lapse
Ms. Iyer's business made a loss of ₹12,00,000 in AY 2017-18. She files her return on time. She can carry this forward up to AY 2025-26 (8 years). If she still has ₹2,00,000 unabsorbed by end of AY 2025-26, that ₹2,00,000 lapses — it cannot be carried to AY 2026-27.
Lesson: The 8-year clock starts from the year of loss, not from the year you first use it.
📖 Bare Act text — Section 72, Income Tax Act 1961
(click to expand)
(1) Where for any assessment year, the net result of the computation under the head "Profits and gains of business or profession" is a loss to the assessee, not being a loss sustained in a speculation business, and such loss cannot be or is not wholly set off against income under any head of income in accordance with the provisions of section 71, so much of the loss as has not been so set off or, where he has no income under any other head, the whole loss shall, subject to the other provisions of this Chapter, be carried forward to the following assessment year, and— (i) it shall be set off against the profits and gains, if any, of any business or profession carried on by him and assessable for that assessment year; (ii) if the loss cannot be wholly so set off, the amount of loss not so set off shall be carried forward to the following assessment year and so on: Provided that where the whole or any part of such loss is sustained in any such business as is referred to in section 33B which is discontinued in the circumstances specified in that section, and, thereafter, at any time before the expiry of the period of three years referred to in that section, such business is re-established, reconstructed or revived by the assessee, so much of the loss as is attributable to such business shall be carried forward to the assessment year relevant to the previous year in which the business is so re-established, reconstructed or revived, and— (a) it shall be set off against the profits and gains, if any, of that business or any other business carried on by him and assessable for that assessment year; and (b) if the loss cannot be wholly so set off, the amount of loss not so set off shall, in case the business so re-established, reconstructed or revived continues to be carried on by the assessee, be carried forward to the following assessment year and so on for seven assessment years immediately succeeding. (2) Where any allowance or part thereof is, under sub-section (2) of section 32 or sub-section (4) of section 35, to be carried forward, effect shall first be given to the provisions of this section. (3) No loss (other than the loss referred to in the proviso to sub-section (1) of this section) shall be carried forward under this section for more than eight assessment years immediately succeeding the assessment year for which the loss was first computed.