Capital Loss Harvesting: Smart Planning or Tax Mistake?

A portfolio screen showing an unrealised loss does not create a tax loss. The sale must be real, correctly classified and economically supportable.

What the taxpayer should understand

• Confirm which Act governs the year in question — the 1961 Act for FY 2025–26/AY 2026–27, the 2025 Act for Tax Year 2026–27 onward — before applying any threshold or section number.
• For FY 2025–26, capital-loss set-off and carry-forward follow the 1961 Act rules.
• Short-term and long-term capital losses have different permitted set-offs.
• Transactions between related parties, circular trades or pre-arranged repurchases require substance, market-price and anti-abuse review.
• Brokerage, STT, spread, exit load and market movement can exceed the expected tax value.
• A carry-forward strategy can fail if the return is filed late.

Use the ITR Form Selector — AY 2026–27 to work through the related inputs before acting.

The five-point review

For the connected rule, example or next step, see Mutual Fund Capital Gains Tax Planning 2026.

Practical example

For the connected rule, example or next step, see Tax on ESOP Exercise vs Sale: Cash-Flow Planning.

How to apply the framework

Model the tax benefit net of transaction costs — brokerage, STT, exit load and the bid-ask spread can meaningfully erode the benefit of harvesting a loss, especially on smaller positions. Weigh the after-cost tax saving against the risk of being out of the market, or the cost of re-entering at a different price, before treating the exercise as a clear win.

Preserve contract notes and market-price evidence for the sale, particularly where a repurchase of the same or a similar security follows soon afterward — the closer in time and price the repurchase is to the original sale, the more scrutiny the transaction’s commercial substance can attract.

For the connected rule, example or next step, see Capital Loss Set-Off: STCL vs LTCL Matrix for 2026.

Filing-control workflow

Confirm the year and the applicable set-off rules

Identify whether the loss falls in FY 2025–26 (1961 Act rules) or Tax Year 2026–27 onward (2025 Act, same substantive structure). Separately classify the loss as short-term or long-term: a long-term capital loss can only be set off against long-term gains, while a short-term capital loss can be set off against either short-term or long-term gains.

Verify the transaction has real commercial substance

Confirm the sale went through a genuine market mechanism — an exchange trade or a registered transfer — at a price consistent with prevailing market value, to an unrelated counterparty, with funds actually changing hands. A same-day or near-simultaneous repurchase through a related account, family member or connected entity is the pattern most likely to be challenged as lacking commercial substance.

Check the loss appears correctly in the return

Confirm the Capital Gains schedule reflects the correct asset type, holding period, sale value and cost, and that the resulting short-term or long-term loss flows through to the set-off and carry-forward schedules. Reconcile AIS, TIS and Form 26AS entries for the same transaction, since portal data can lag or misclassify a sale.

Confirm the return was filed on time

A capital loss can only be carried forward to future years if the return for that year is filed by the original due date — a belated return forfeits the right to carry the loss forward, even though the current year’s set-off against existing gains is unaffected. Preserve the filed return, computation and broker contract notes as the evidence trail.

Action checklist

• Identify compatible gains.
• Verify holding period.
• Estimate net tax benefit.
• Execute genuine market transaction.
• Reconcile contract notes.
• File loss return on time.

Evidence to keep

• Broker statements
• Contract notes
• Holding-period and cost working
• Tax-benefit calculation
• Filed loss schedule

Warning signs

Finin2min takeaway