Tax Loss Harvesting Before March 31: The Trade Most Indian Investors Miss

The Trade That Is Not a Trade

Tax loss harvesting is often described as though it were a form of market timing or clever speculation. It is neither. It is a bookkeeping operation — a deliberate realisation of paper losses to reduce your taxable capital gains in the same financial year. No market view is required. No stock picking is involved. The only judgement call is whether a position you are already holding at a loss is worth closing for the tax benefit.

The arithmetic is straightforward. If you have made ₹2,00,000 in short-term capital gains (STCG) this year — taxed at 20% — your current tax liability on those gains is ₹40,000. If you also hold a stock or mutual fund unit that is sitting at a ₹80,000 unrealised loss, and you sell it before March 31, your net STCG becomes ₹1,20,000 and your tax liability drops to ₹24,000. You have saved ₹16,000 without any change to your market exposure, your investment thesis, or your long-term plan.

The loss is not destroyed. It is realised and used.

What the Indian Tax Code Actually Says

Understanding the offset rules matters before executing.

Short-term capital loss (STCL) can be offset against both short-term capital gains and long-term capital gains in the same year. This flexibility makes short-term losses more useful for tax purposes.

Long-term capital loss (LTCL) can only be offset against long-term capital gains. Since the introduction of LTCG tax on equity in 2018, long-term losses on equity and equity mutual funds can now be used — this was not always the case.

The carry-forward provision is the backstop: if you have more losses than gains to offset this year, the unabsorbed losses can be carried forward for eight assessment years, provided you file your income tax return on time. This makes harvesting even low-gain years worthwhile.

One boundary that does not exist in India: there is no wash sale rule. In the United States, repurchasing the same security within 30 days of harvesting a loss disqualifies the loss. India has no equivalent restriction. You can sell a stock, book the loss, and repurchase it the next day. The tax benefit is preserved.

The Settlement Deadline

March 31 is not the last effective date. Settlement is.

Equity and equity mutual funds in India settle on a T+1 basis. To have a trade settle and the loss counted within this financial year, the sell order must be executed by the last trading session that settles on or before March 31.

For this financial year, the last effective trading date for equity loss harvesting is March 28, 2026 — the last stock exchange trading day before March 31. Trades executed on March 31 itself (which falls on a Tuesday this year) will settle on April 1 — next financial year. That loss does not count.

This is the detail most investors miss. If you are planning to harvest losses, the operational deadline is March 28, not March 31.

"The difference between knowing about tax loss harvesting and actually doing it is the same difference as knowing you should exercise and actually exercising — except in this case, not doing it costs a measurable, calculable amount of money every year."

Identifying Candidates in Your Portfolio

A tax loss harvesting candidate meets three criteria:

1. It is currently at an unrealised loss relative to your purchase price
2. You have capital gains this year (realised or about to be realised) that need offsetting
3. You are indifferent to selling it — meaning you do not have strong conviction that it will recover sharply in the next few weeks, or you are willing to repurchase after selling

The third criterion is where most investors get stuck. They conflate the tax decision with the investment decision. These are separate questions. The tax question is: does realising this loss reduce my tax bill? The investment question is: do I want to hold this position? You can answer yes to both — harvest the loss and repurchase the position — or answer yes to the first and no to the second.

Not every loss deserves to be harvested. Positions with small unrealised losses may not generate enough tax benefit to justify the transaction cost and effort. Short-term losses that cannot be matched against any gains this year are still worth harvesting (they carry forward), but the urgency is lower. Positions you are emotionally committed to not selling — stocks you hold for specific fundamental reasons and would find psychologically difficult to repurchase — may be better left alone.

The candidates worth prioritising are positions where you are genuinely neutral: you hold them, you have not had a reason to sell, but you do not have strong conviction either way. These are the positions where the tax logic should drive the decision, because there is no investment logic competing with it.

Mutual Funds and the 12-Month Rule

Equity mutual fund units held for less than 12 months create short-term capital gains or losses. Units held for more than 12 months create long-term capital gains or losses.

This creates a specific opportunity for investors who made SIP purchases in the March-September 2025 period and are sitting on losses in those tranches. If those tranches have been held for less than 12 months, selling them before March 28 creates a short-term capital loss — which can offset your STCG from any other source, including intraday trading gains, F&O profits treated as speculative income is separate, and other equity STCG.

However: if those tranches are close to the 12-month mark, it may be worth waiting. A loss in a fund tranche held for 11 months is a short-term loss. The same tranche held one more month becomes a long-term loss, which can offset LTCG but not STCG. If your gains are primarily short-term, the short-term loss is more valuable — sell now. If your gains are primarily long-term, waiting for the 12-month mark may preserve the flexibility to offset LTCG.

The Execution Sequence

If you have identified positions to harvest:

Step 1: Verify the realised gains figure. Your XIRR is a useful signal here — a significantly lower XIRR than your benchmark suggests unrealised losses may be larger than you think. Look at your P&L statement from your broker for the current financial year. The number you need is total realised capital gains, segmented into STCG and LTCG. This is the number you are trying to reduce.

Step 2: List your unrealised losses. Pull your current portfolio view and identify every position where the current value is below your cost. Note the approximate loss amount and whether the holding period is short-term or long-term.

Step 3: Match losses to gains. Short-term losses are most flexible — they offset both STCG and LTCG. Long-term losses only offset LTCG. Prioritise harvesting short-term losses if your gains are primarily short-term.

Step 4: Decide on repurchase. For each position you are harvesting, decide whether you want to remain invested. If yes, you can repurchase immediately — the settlement timing creates a brief gap in your holdings, but the economic exposure is effectively continuous. If no, you are closing the position entirely, which is a separate investment decision.

Step 5: Execute before March 28. Settlement matters. March 28 is the last trading day for T+1 settlement before March 31.

Step 6: Update your records. Keep the contract notes and transaction records. You will need them when filing your ITR to claim the loss offset.

The Compounding Effect

Tax loss harvesting is not a one-time exercise — it is an annual practice that compounds over time. It pairs naturally with your monthly portfolio checkup — the FY-end review is one of the highest-leverage checkups of the year.

An investor who consistently harvests ₹50,000 in losses per year and offsets them against gains at a 20% STCG rate saves ₹10,000 per year in tax. Over ten years, assuming those savings are reinvested, that is a meaningful addition to compounded returns — not from market outperformance, but from efficient tax management.

The investors who do this consistently are not doing anything complicated. They are doing something systematic: reviewing their portfolio once a year before March 31, identifying the positions where the tax arithmetic is clearly in their favour, and executing the trade. The discipline is more valuable than the insight.

What PortoAI Can Help With

Identifying tax loss harvesting candidates manually requires cross-referencing your purchase dates, cost prices, current market prices, and realised gains from across multiple brokers. If you hold accounts at both Zerodha and Groww — as many Indian investors do — the P&L figures are siloed across platforms and the effort of aggregating them manually deters most people from doing the exercise at all.

PortoAI connects to your Zerodha and Groww accounts directly, aggregates your holdings and P&L across both platforms, and can identify positions where the loss is large enough to justify harvesting given your realised gains. This is the specific kind of mechanical analysis where AI assistance is genuinely useful — not because the logic is complex, but because the data aggregation across multiple sources is tedious enough that most investors simply don't do it.

Frequently Asked Questions

What is tax loss harvesting in India?

Tax loss harvesting is selling investments that are currently at a loss to realise those losses, which can then be offset against capital gains you have made elsewhere in the same financial year. In India, short-term capital losses can offset both STCG and LTCG. Long-term capital losses can only offset LTCG. The net effect is a reduction in your taxable capital gains and therefore your tax outflow. There is no wash sale rule in India, so you can repurchase the same position immediately after harvesting.

What is the deadline for tax loss harvesting in India?

For FY 2025-26, the last effective date to execute a sell order that will settle before March 31 is March 28, 2026. Equity and equity mutual funds settle T+1, meaning trades executed on March 31 settle on April 1 — the next financial year. That loss will not count for this year. Plan to execute by March 28.

Can I buy back the same stock after harvesting the loss?

Yes. India has no wash sale rule. You can sell a stock to harvest the loss, then repurchase it the same day or the next day. The tax benefit is preserved, and your portfolio exposure remains effectively unchanged. Your cost basis in the new position resets to the repurchase price, but the loss from the sold position is now available to offset your gains.

Which losses can offset which gains in India?

Short-term capital loss (STCL) can offset both short-term capital gains (STCG) and long-term capital gains (LTCG) in the same year. Long-term capital loss (LTCL) can only offset long-term capital gains (LTCG). Neither can be offset against salary or business income. Unabsorbed losses carry forward for 8 assessment years if you file your ITR on time.

Does tax loss harvesting apply to mutual funds?

Yes. Equity mutual fund units sold before 12 months of holding generate short-term capital gains or losses. Units sold after 12 months generate long-term capital gains or losses. The same offset rules apply. If you have SIP tranches purchased 10-11 months ago that are at a loss, selling them before March 28 creates a short-term capital loss. If those tranches are close to the 12-month mark and your gains are primarily long-term, it may be worth waiting one more month so the loss becomes a long-term loss.