Business Loss Carry Forward

Section numbers are from the Income tax Act, 1961, the operative law for the current filing cycle. The Income tax Act, 2025 renumbers these provisions from Tax Year 2026-27. This article is for general information and does not constitute tax advice.

In the loss year, and in every year after

The rules differ sharply between the year the loss arises and later years, and conflating the two is where most planning goes wrong.

In the year of the loss, a business loss can be set off against income under any head except salary. So a proprietor with a loss-making business and rental income can absorb the loss against that rental income in the same year.

Once carried forward, it narrows. A brought-forward business loss can be set off only against business income, not against house property, capital gains or other sources. The same rupee of loss is therefore worth more if used in the year it arises than if carried forward, which is worth knowing before deferring income or accelerating expenditure across a year end.

Eight years, and the clock does not stop

A business loss carries forward for eight assessment years immediately succeeding the year in which it arose. It does not matter whether the business continues to be carried on, and it does not matter whether profitable years happen to fall inside the window. If eight years pass without enough business income to absorb it, the balance simply lapses.

A speculation business loss is treated separately and more harshly: it can be set off only against speculation profits, and carries forward for four years rather than eight. Keeping speculative and ordinary business results distinct in the books matters for exactly this reason.

The filing deadline is the whole ballgame

A business loss can only be carried forward if the return for the loss year was filed by the due date. File late, and the loss is not merely delayed, it is gone. There is no mechanism to revive it in a later return, and no amount of subsequent profitability brings it back.

This is the most expensive avoidable mistake in this area, and it bites hardest exactly where you would expect: a loss-making year, where there is no tax to pay, feels like a year where filing is not urgent. It is the opposite. A business with no liability and a large loss has more riding on the deadline than a profitable one.

Once a loss has been validly carried forward in a timely return, later returns claiming its set-off do not carry the same condition. It is the loss year’s filing that governs.

Closely held companies: a change in shareholding can wipe it out

For a company in which the public is not substantially interested, carried-forward business loss survives only if shares carrying at least 51% of voting power are beneficially held by the same persons on the last day of the year in which the set-off is claimed as on the last day of the year the loss arose. Put the other way: a change in beneficial ownership of more than 49% forfeits the accumulated loss.

This is a live issue in any funding round, founder exit or family transfer involving a loss-making private company, and it is frequently discovered after the fact. The accumulated loss is often one of the more valuable items on the balance sheet, and the share transfer that destroys it may have been executed for reasons that had nothing to do with tax. Relief exists in specified situations, including certain amalgamations and demergers, and for eligible start-ups, but these are exceptions with their own conditions rather than a general safety net.

Note that this restriction attaches to business loss and not to unabsorbed depreciation, which follows a different and considerably more generous set of rules, set out in Unabsorbed Depreciation.

And if you switch to the concessional corporate regime

Opting into Section 115BAA or 115BAB forfeits brought-forward loss attributable to the deductions being given up, and that portion cannot be revived. A company sitting on substantial accumulated losses should quantify what the switch actually destroys before making an irrevocable election, as covered in Company Tax Rates.