Rebalancing is the least glamorous and most reliable habit in investing. It is simply the act of bringing your portfolio back to its intended shape after markets have pushed it out of line — selling a little of what has run up and adding to what has lagged.
It feels counter-intuitive because it means trimming your winners. But that discipline is exactly what keeps a single hot stock or sector from silently taking over your portfolio and turning it into a concentrated bet you never intended to make.
Why your portfolio drifts
Say you set out with 60% equity and 40% debt. After a strong equity year, that mix might quietly become 72% equity and 28% debt. You didn't decide to take more risk — the market decided for you. The same happens inside your equity holdings: a stock that doubles becomes twice the weight, and twice the risk, it started as.
Rebalancing resets this drift back to the allocation you actually chose based on your goals and risk appetite.
The three rebalancing methods
Calendar rebalancing
Rebalance on a fixed schedule — quarterly, half-yearly or yearly — regardless of market conditions. Simple and disciplined, but it can trigger trades you did not really need (small drifts) and miss large drifts between dates.
Threshold (band) rebalancing
Set a tolerance band — say 5% — around each target weight, and only rebalance when a holding drifts outside it. This reacts to what markets actually do rather than the calendar, and tends to produce fewer, more meaningful trades. For most investors this is the better default.
Cash-flow rebalancing
The most tax-efficient method: direct new investments (your monthly SIP, a bonus) into whatever is *underweight*, nudging the portfolio back toward target without selling anything. No trades, no capital-gains tax. Combine it with threshold rebalancing for the rest.
The tax angle in India
Rebalancing means selling, and selling equity can trigger capital-gains tax. Short-term gains (holding under a year) are taxed more heavily than long-term gains, so all else equal, rebalancing with holdings you have held over a year — or with fresh money instead of sales — is more efficient. This is general information, not tax advice; check the current rules or a professional for your situation.
The takeaway: do not let the tax tail wag the risk dog. If a position has become a genuine concentration risk, controlling that risk usually matters more than deferring a tax bill — but you can often stage the trimming across financial years to soften the impact.
See exactly what has drifted
AIVITTA shows your current weights against a balanced target, flags what has drifted, and suggests rebalancing moves — with the risk trade-offs spelled out.
How to rebalance without overthinking it
- Know your targetWrite down your intended split — across asset classes, and across sectors within equity.
- Measure the driftCompare current weights to target. Flag anything outside your tolerance band.
- Prefer new moneyDirect SIPs and lump sums to the underweight side before you consider selling.
- Trim with intentIf you must sell, trim the most overweight, highest-risk positions first, and mind holding periods for tax.
- Write it downRecord what you changed and why. Next quarter, you review against a plan instead of a mood.