Portfolio rebalancing in India: what it is, how often, and the tax

What rebalancing is, and the two jobs it does

You set a portfolio up a certain way: 60% equity and 40% debt, or 50 momentum stocks at 2% each. Then prices move, and the portfolio you hold drifts away from the one you chose. Rebalancing brings it back.

People use one word for two different jobs, and it helps to keep them apart:

• Drift correction. The names stay the same; only their weights move. After a strong year for shares a 60:40 mix might be 66:34. Rebalancing sells some equity and buys debt to get back to 60:40. This is risk control: without it, a good run quietly turns a moderate portfolio into an aggressive one.
• Signal refresh. The names themselves change. A momentum rule re-ranks its universe; stocks that have dropped out of the top are sold and new leaders bought. This is where most of the trading in a factor strategy comes from.

The theory, including calendar against threshold rules and the cost of cadence, is in the free rebalancing strategies module. This guide is the practical version, with Indian costs and tax.

A worked example: ₹10 lakh at 60:40, one year later

You start with ₹6 lakh in a Nifty 50 index fund and ₹4 lakh in a debt fund. Over the year equity rises 25% and debt earns 7%.

The trade is small, 3.7% of the portfolio. If the equity units sold were held more than 12 months, the gain inside that ₹43,200 is long term: the gain is ₹43,200 × (25 / 125) = ₹8,640, which sits well inside the ₹1.25 lakh yearly exemption, so no tax. Sold within 12 months, the same ₹8,640 gain is taxed at 20%, ₹1,728. Timing a rebalance past the one year mark is often worth more than any other tweak.

How often should you rebalance?

There is no single right answer, but the evidence and the costs point the same way for most people.

• A personal equity and debt mix: look once a year, and trade only if a weight is more than about 5 percentage points off target. This "check on a date, trade outside a band" rule catches real drift without trading on noise.
• New money first: if you invest every month, point the new money at the underweight side. You rebalance without selling anything, and without tax.
• A factor rule: the rule sets the calendar, because the signal goes stale. NSE's momentum and quality indices rebalance twice a year; the Nifty Alpha 50 every quarter; RupeeCase momentum rules every 1 to 4 weeks.

The drift threshold calculator tells you whether your own portfolio has crossed its band today.

What the published record shows about turnover

RupeeCase publishes every rebalance of every index algo, with the full list of names, in the rebalance record. Counting how many names on each new list were not on the one before shows how differently two rules trade.

Allcap had 27 rebalances in that year, so roughly five of its names in every twenty change each fortnight. Nifty 50 Equal Weight had 14, and nearly all of its trading is resetting weights back to 2% each, because the Nifty 50 itself changes members only twice a year. Same platform, very different tax and cost profile. Weight resets still trade: an equal weight rule sells a little of every winner at every rebalance.

What a rebalance costs

Every rebalance has three kinds of cost.

1. Charges on the trades: STT at 0.1% of each delivery buy and each sell, exchange and SEBI charges, stamp duty on buys, brokerage and GST. Budget 2026 raised STT on futures and options from 1 Apr 2026; delivery trades were not changed.
2. Any fee for running the rule: RupeeCase charges 0.2% of the value traded at each rebalance and nothing else. On the strategy pages that works out, at 30% of the book traded per rebalance, to about 1.56% of capital a year for a fortnightly rule and about 0.78% for a four weekly one.
3. Tax on the gains: the biggest of the three in a strong year for a fast rule, because most of its sales are within 12 months.

The rebalance cost calculator does the first two on your own numbers, and the blog note on two week rebalancing and the STCG objection works through the third.

Rebalancing a mutual fund portfolio

Most Indian investors hold their equity through funds, and the same rules apply with two extra costs. Switching from one scheme to another, even inside the same fund house, is a sale and a fresh purchase: it can trigger capital gains tax and, if the units are recent, an exit load, often 1% on units held under a year. So rebalance a fund portfolio mostly with new SIP money, and keep switches for the yearly check when lots are past the one year mark.

Look through the fund names too. Five large cap and flexi cap funds can hold many of the same stocks, so a portfolio that looks diversified across schemes may be one large bet. Pull your consolidated account statement before you rebalance, and count the overlap. The blog note twenty funds, one bet shows how far that goes.

Debt is the other half. Since April 2023, gains on most debt funds are taxed at your income tax slab rate whatever the holding period, so moving money from equity to debt at a rebalance swaps a lower equity rate on future gains for your slab rate on the debt side. That is a reason to set the equity and debt split carefully once, not to avoid rebalancing.

How to rebalance a portfolio, step by step

1. Write the targets downthe weights, or the rule, and the band or calendar you will use.
2. Check on the datecompare actual weights with the targets; skip the trade if every weight is inside its band.
3. Use new money and dividends firstdirect them to the underweight side before selling anything.
4. Sell the oldest lots firstlots held over 12 months qualify for the lower long term rate and the ₹1.25 lakh exemption.
5. Book losses where they helpa losing lot sold at a rebalance offsets gains in the same year.
6. Log every tradedates, quantities and prices, so your capital gains statement matches your broker's.

Common mistake: skipping the rebalance that feels wrong

Rebalancing always means selling what has done well and buying what has not. After a big rally the sale feels like cutting a winner; after a crash the purchase feels like catching a falling knife. That feeling is exactly why the rule is written down. A skipped rebalance in March 2020 or in a sharp sell off is a different strategy from the one you planned, usually a worse one. The systems that protect you from yourself module is about this habit.

How this shows up in RupeeCase

Every RupeeCase index algo rebalances on a fixed calendar, from weekly to every four weeks, and you approve each rebalance before orders go to your own broker. The full list of names in and out is published for every date in the rebalance record, so you can count turnover yourself before you choose. Allcap Multi Asset adds drift correction across asset classes: about 80% in 50 momentum stocks, 10% debt and 10% gold, reset every 2 weeks, with a model CAGR of 40.47% and a deepest fall of −21.32% as of 27 Apr 2026. The fee is the same everywhere: 0.2% of traded value, as on the pricing page.

Questions investors ask