The point
A crypto sleeve that starts with 20 percent in Solana and watches it double ends up with 33.3 percent in Solana, and nobody decided that. Rebalancing is the written rule that undoes it: sell what grew heavy, buy what fell light, on a date fixed in advance. Left alone, a portfolio becomes a bet on whatever ran last.
Why does a portfolio drift into its last winner?
Nobody sells a winner on purpose. A holding that has doubled feels like proof that the decision was right, and selling it feels like arguing with the evidence. So the winner stays, its share of the portfolio grows, and the next fall hits a larger position than the one you chose.
That is drift, and it needs no mistake from anyone. It only needs prices to move at different speeds, which in crypto they do constantly. A coin that doubles while two others stand still has taken a third of the sleeve without a single order being placed.
The sell rule is the only part of rebalancing that matters. Buying what lagged is easy, because it feels like value. Selling what ran is the hard half, and it is the half a written rule does for you.
What does the arithmetic of one rebalance look like?
Take a crypto sleeve of ₹20 lakh, split 50 percent Bitcoin, 30 percent Ethereum and 20 percent Solana. That is ₹10 lakh, ₹6 lakh and ₹4 lakh. These are the weights published for QSI VRION on the Qatobit index page as of 19 October 2026. They are here to illustrate the mechanic, and they forecast nothing.
Now Solana doubles and the other two hold still. Solana is worth ₹8 lakh, the sleeve is worth ₹24 lakh, and the weights have moved to 41.7 percent Bitcoin, 25 percent Ethereum and 33.3 percent Solana.
The target on ₹24 lakh is ₹12 lakh Bitcoin, ₹7.2 lakh Ethereum and ₹4.8 lakh Solana. Solana is ₹3.2 lakh over its target (₹8 lakh minus ₹4.8 lakh). Bitcoin is ₹2 lakh under (₹12 lakh minus ₹10 lakh) and Ethereum is ₹1.2 lakh under (₹7.2 lakh minus ₹6 lakh). The two shortfalls add up to ₹3.2 lakh, exactly what the sale of Solana raises.
The rule sells ₹3.2 lakh of Solana and spends it on ₹2 lakh of Bitcoin and ₹1.2 lakh of Ethereum. The rule makes no call on what Solana does next.
Does the rule win every time?
No. Run the same sleeve forward two ways. In the first, Solana then halves. Without a rebalance, Solana drops from ₹8 lakh to ₹4 lakh and the sleeve is back at ₹20 lakh. With the rebalance, Solana drops from ₹4.8 lakh to ₹2.4 lakh while Bitcoin stays at ₹12 lakh and Ethereum at ₹7.2 lakh, so the sleeve is worth ₹21.6 lakh. The rule softened the fall by ₹1.6 lakh.
In the second, Solana doubles again. Without a rebalance, Solana goes from ₹8 lakh to ₹16 lakh and the sleeve is worth ₹32 lakh. With the rebalance, Solana goes from ₹4.8 lakh to ₹9.6 lakh and the sleeve is worth ₹28.8 lakh. The rule gave up ₹3.2 lakh of that run.
Both outcomes show the rule doing its job. Vanguard's research team states the aim plainly in a study of rebalancing strategies. The primary goal is to minimise risk relative to a target asset allocation, rather than to maximise returns. You buy a position size you chose, and the rule keeps you at it. It is a risk tool, and it has a price in the years when the winner keeps winning.
What should the trigger be, a date or a band?
Both triggers are defensible, and the published research does not crown one. The same Vanguard paper found that risk-adjusted results were not meaningfully different whether a portfolio was rebalanced monthly, quarterly or annually. What changed was the number of rebalancing events and their costs. In its test, monthly rebalancing with no threshold needed 1,008 events, against 15 for annual rebalancing with a 10 percent threshold.
That finding is about broadly diversified stock and bond portfolios, and crypto moves much faster, so a date-based reset is less of a luxury there. It also tells you what to demand from any rule: that it exists in writing, and that you can see which trigger it runs on. A band that nobody wrote down gets overridden at exactly the moment it should fire.
Qatobit's indexes run on a calendar. The methodology page describes stage five as the monthly rebalance, a calendar-defined reset that trims what has run hot and tops up what has lagged. The index page states that every index drifts as prices move, and that once a month it is reset to its published weights, the same way, every time.
Where does tax fit in?
A rebalance you do by hand across separate coins is a series of sales, and each sale is a taxable transfer. That changes the arithmetic of the example above, because the ₹3.2 lakh Solana sale becomes an event with its own tax consequence.
Inside a Qatobit index the position is different. A monthly rebalance inside an index is not the investor's taxable event. The investor's own sale of the basket is the taxable event. What you hold is the basket.
Why a written rule beats good intentions
Most people can describe their target weights and few can say when they last sold a winner to restore them. The gap is timing. A decision made while a position is up 100 percent differs from one made on a calm day. The calm-day decision is the one you meant to make.
A published rule moves the decision to the calm day. It also moves it out of reach of the group chat and the story about why this one is different. That is the case for putting the sell rule in the product instead of in your own calendar.
QSI Growth holds Bitcoin, Ethereum, Solana, Gold and a stable reserve on a monthly rebalance. The weights are on the index page and the rebalance is the same on every date. If you would rather the selling were done by a rule than by a mood, invest in QSI Growth and let the methodology carry the schedule.
Related reading
Calendar and band triggers are covered in portfolio rebalancing when one holding falls 10 percent. Index behaviour through a sharp fall is in how a crypto index rebalances during a market crash. The tax side is in whether a crypto index rebalance triggers tax in India. The full rule set is on the QSI methodology page.
Sources read this run: Vanguard, Best practices for portfolio rebalancing (Jaconetti, Kinniry and Zilbering, 2010), https://indexacapital.com/bundles/unaiadvisor/docs/papers/2010-Vanguard-Best-practices-for-portfolio-rebalancing.pdf, read 19 October 2026. Qatobit index weights and cadence: https://qatobit.com/indices and https://qatobit.com/methodology, read 19 October 2026. The rupee figures are an illustration, not a forecast.
Frequently asked questions
What is crypto portfolio rebalancing?
Crypto portfolio rebalancing means selling part of what has grown above its target weight and buying what has fallen below it, so the portfolio returns to the weights you set. In the example above, a ₹3.2 lakh Solana sale restores a ₹24 lakh sleeve to 50, 30 and 20 percent.
How often should a crypto portfolio be rebalanced?
Research on stock and bond portfolios found no single best frequency. Risk-adjusted results were not meaningfully different across monthly, quarterly and annual schedules, though costs rose with the number of events. Qatobit's QSI indexes rebalance monthly on a calendar.
Does rebalancing guarantee a better result?
No. In the worked example the rule softened a fall by ₹1.6 lakh and gave up ₹3.2 lakh when the winner kept running. Its job is to hold the position size you chose.
Is a monthly rebalance inside a Qatobit index a taxable event?
No. A monthly rebalance inside an index is not the investor's taxable event, and the investor's own sale of the basket is. Qatobit charges 0.35 percent on each basket transaction, including a rebalance, and no annual management fee.
Which Qatobit index suits a portfolio that wants a rebalance rule?
All four QSI indexes rebalance monthly, and three of the four hold crypto. QSI Growth holds Bitcoin, Ethereum, Solana, Gold and a stable reserve, and QSI VRION holds Bitcoin, Ethereum and Solana with no hedge layer.
Crypto investments are subject to market risk. Not financial advice.
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