How To Maximise Tax Benefits Through Capital Loss Planning

Most investors write off capital losses as a bad outcome and move on. That's a mistake. Used properly, they're one of the more effective — and completely legitimate — ways to reduce your tax liability. For this, it is important to understand how capital losses are set off.

Understanding Set-Off Rules

Dinesh K. Jain, managing partner,  Dinesh Aarjav & Associates, Chartered Accountants says that short-term capital losses are the more flexible of the two kinds of losses. “They can be set off against both short- and long-term gains, giving you more room to manoeuvre. Long-term losses are narrower — they can only be applied against long-term gains,” he says.

It is because of this that sequence also matters. In practice, it makes sense to utilise short-term losses first because they are more flexible. “Since short-term gains are usually taxed at a higher rate, adjusting short-term losses against such gains gives better tax relief. If any short-term loss remains, it can then be used against long-term gains. Long-term losses, being restricted, are best kept for adjusting against long-term gains in the same or future years,” says Shourya Garg, advocate, Garg & Garg Associates.

Carry-Forward And Timing Matter 

“What many people don't realise is that a loss doesn't expire at year-end. Capital losses can be carried forward for up to eight assessment years, meaning a rough year in the market can still work in your favour well into the future. The condition, though, is timely filing. If you miss the due date under Section 139(1), that carry-forward benefit is forfeited — you lose the ability to use those losses across future years, which is a steep price for a procedural lapse,” says Jain.

However, what many people don't realise is that a loss doesn't expire at year-end. Capital losses can be carried forward for up to eight assessment years, meaning a rough year in the market can still work in your favour well into the future. 

“The condition, though, is timely filing. If you miss the due date under Section 139(1), that carry-forward benefit is forfeited — you lose the ability to use those losses across future years, which is a steep price for a procedural lapse,” says Jain. 

It is also important to note that losses have value only if they are actually booked.”If investments are just showing a loss on paper but are not sold before year-end, that loss cannot be used. So, towards the end of the financial year, investors often review their portfolio and book losses where it makes sense,” says Garg.

Common Mistakes To Avoid 

Many taxpayers lose out simply due to avoidable lapses. If losses are not booked before 31 March, they remain notional and give no tax benefit. Errors also occur when long-term capital loss (LTCL) is wrongly set off against short-term capital gain (STCG). Filing the return after the due date results in loss of carry-forward.

“Past losses are often ignored despite the eight-year limit. Misclassification (e.g., futures and options (F&O) vs capital gains) further complicates matters. Basic discipline—timely booking, correct set-off, proper filing, and maintaining records—ensures losses are effectively utilised,” says Garg.