Carry-forward periods, section numbers and due dates change, and the statute itself changed with effect from assessment year 2026-27. The mechanism described here is stable; the specifics may not be. Confirm the current position before relying on any of it.
A loss is an asset
A ₹6,00,000 F&O loss is not simply money gone. Properly claimed, it shelters ₹6,00,000 of future profit from tax. At a 30% marginal rate, that is ₹1,80,000 of tax you will not pay in some later year — a real, quantifiable asset created by a bad year.
The catch is that this asset exists only if you claim it, and claiming it has one unforgiving condition.
Set off first, carry forward second
The law applies losses in a fixed order, and it is not optional.
- Within the same head. An F&O loss first reduces other non-speculative business income in the same year.
- Against other heads, same year. Anything remaining can generally be set against rental income, interest income and capital gains. Not salary — that head is excluded.
- Carried forward. Only what survives both steps is carried into future years, where it can be set against business income.
The consequence people find counter-intuitive: you cannot choose to save a loss for a better year. If you have income it can be set against now, it is used now, whether or not that suits you.
A loss you did not report is not a loss carried forward. It is a loss donated.
The deadline that has no appeal
This section exists because it is the single most costly mistake in trader taxation.
To carry a loss forward, the return must be filed by the original due date. Not the belated deadline. Not after paying a late fee. The original date.
File late and you may still report the loss, and you may still use it against other income in that same year — but the right to carry the unabsorbed part forward is permanently forfeited. There is no rectification for it, no condonation in the ordinary course, and no argument to be made afterwards.
Every year, traders who lost money decide there is no point filing because no tax is owed. In a loss year, filing is worth more than in a profitable one — it is the act that converts the loss into a future asset.
Eight years, and what survives
- Non-speculative business losses — which is what F&O produces — can generally be carried forward for eight assessment years following the year of the loss.
- Once carried forward, they set off against business income in those later years, not against other heads.
- Speculative losses — intraday equity — carry forward for a shorter period and can only ever be set against speculative gains. Keeping the two streams separate in your records is not optional bookkeeping; it is what lets either be claimed.
- Each year's loss has its own clock, and older losses are absorbed first.
Filing on time in the loss year and then not reporting the carried-forward figure in the following year's return. The loss has to be carried through every intervening return to stay alive. Skip a year and the chain breaks. Keep one page listing each year's loss, how much has been absorbed, and how much remains — your future accountant, who may not be your current one, will need exactly that.
Read it yourself
- You lose ₹4,00,000 on F&O and earn ₹1,20,000 in bank interest in the same year. What happens?
- You have a salary of ₹15,00,000 and an F&O loss of ₹3,00,000. What can the loss do?
- You lose ₹5,00,000 trading, owe no tax, and do not file. Next year you make ₹5,00,000. What is the cost of not filing?
Show answers
1. The loss is set against the interest income first, wiping out that ₹1,20,000 of taxable income. The remaining ₹2,80,000 is carried forward — provided the return was filed by the original due date.
2. Nothing against the salary. Salary is the excluded head. If you have no other non-salary income, the whole ₹3,00,000 carries forward to be set against future business income — which makes filing on time the only thing that preserves it.
3. Roughly ₹1,50,000, at a 30% rate. The ₹5,00,000 loss could have sheltered the entire next year's profit. Because the return was not filed by the due date, the carry-forward is gone and the ₹5,00,000 profit is fully taxable. Filing would have taken an afternoon.
Terms used
- Set-off
- Using a loss to reduce other income in the same year.
- Carry forward
- Taking an unabsorbed loss into future years.
- Original due date
- The statutory filing deadline. Filing after it forfeits carry-forward.
- Belated return
- A return filed after the due date. Valid, but carries no loss forward.
- Unabsorbed loss
- The part of a loss not used up by set-off in the year it arose.