Portfolio Rebalancing: When and How to Rebalance
You picked 60% equity, 40% debt. Two good years later, it's quietly become 75:25 — and far riskier than you signed up for. Here's how to steer it back.
Three years ago, Nikhil did everything the personal-finance books told him to. He split his money 60% into equity funds and 40% into debt — enough growth to build wealth, enough cushion to sleep at night. He felt responsible. Adult. Sorted.
Then the market had a great run. Nikhil didn't touch a thing — why fix what's working? But when he finally opened his statement last week, he got a small shock. His 'balanced' portfolio was now 76% equity and 24% debt. He hadn't made a single risky decision. Yet somewhere along the way, he'd become a much more aggressive investor than he ever chose to be.
The problem nobody warns you about
Here's the sneaky part. When one part of your portfolio grows faster than the rest, it silently takes up a bigger and bigger share. Your carefully chosen mix drifts. And because the drift happens during good times, it feels great — right up until the market turns.
Think of what happens if stocks fall 30% from that 76% position versus the original 60%. Nikhil would lose noticeably more than the portfolio he actually designed for himself. He'd be taking a punch he never agreed to take. This quiet creep of risk is exactly what rebalancing exists to fix.
What rebalancing really is
Rebalancing is simply resetting your investments back to your original target mix. Trim the slice that's grown too fat, top up the slice that's shrunk, and you're back to the balance you chose when you were thinking calmly — not when the market was euphoric or panicking.
Rebalancing forces you to do the hardest thing in investing: sell a little of what's expensive and buy a little of what's cheap — the exact opposite of what your emotions scream.
It's not a trick to boost returns. In a runaway bull market, a rebalanced portfolio will actually earn less than one where you let equity run wild. The point is different: it keeps your risk where you can live with it, so a bad year doesn't turn into a life-changing loss.
A simple example
Say you have ₹10 lakh at a 60:40 equity-debt target — that's ₹6 lakh in equity, ₹4 lakh in debt. A strong year pushes equity to ₹8 lakh while debt sits at ₹4.2 lakh. Now your total is ₹12.2 lakh and equity is ~66%. To rebalance to 60:40, you'd want about ₹7.32 lakh in equity — so you move roughly ₹68,000 from equity into debt. Boring? Yes. But you've just locked in some gains and reloaded your safety net at the same time.
When to do it
You don't need to obsess over your portfolio daily. Two low-effort methods cover most people. Calendar rebalancing: pick one date a year — your birthday, or 1 April — and reset whatever has drifted. Threshold rebalancing: only act when any asset class moves more than about 5 percentage points from its target. Both beat the two extremes of fiddling constantly (which costs taxes and nerves) or never checking at all (which lets risk balloon like Nikhil's did).
Selling equity units to rebalance can trigger capital gains tax. A cleaner move: redirect your NEW money. Point fresh SIPs and lumpsums into whichever asset class has fallen below target, and you nudge the mix back toward balance without booking any gains. Rebalance by buying, not selling, wherever you can.
The tax angle you can't ignore
In India, selling equity mutual fund units is a redemption, and any gains are taxable — short-term if you held under a year, long-term beyond that. So rebalancing purely by selling can quietly hand a chunk to the taxman. That's why steering fresh contributions is the beginner-friendly way, and why, when you must sell, it pays to be mindful of your annual long-term gains exemption. If you want the full picture on how these gains are taxed, read our guide on mutual fund taxation.
What this means for you
Rebalancing is the financial equivalent of getting your car's wheels realigned — dull, easy to skip, and the reason you don't drift off the road later. Start by knowing your target mix (our guide on asset allocation by age is a good anchor), check it once a year, and reset gently using new money first. If you're already thinking about which fund to trim, our piece on when to sell or exit a fund pairs well with this. And if you're mapping out how a lumpsum should be split, run the numbers through our lumpsum calculator before you commit.
- Portfolios 'drift' as winners grow — a 60:40 mix can quietly become 75:25, raising your risk without any decision on your part.
- Rebalancing resets your investments to your chosen target mix, keeping risk where you're comfortable.
- Use calendar (once a year) or threshold (act on a ~5% drift) rebalancing — avoid both over-tinkering and total neglect.
- Rebalancing by SELLING equity can trigger capital gains tax; redirect new SIPs and lumpsums to rebalance more tax-efficiently.
- The goal isn't maximum returns — it's staying within the risk you actually signed up for.
Nikhil's fix took ten minutes: he moved a slice of equity back into debt and set a yearly reminder to check again. His portfolio isn't flashier for it — but it's finally the one he actually chose, not the one the market accidentally built for him.
Do you rebalance your portfolio on a schedule, or has yours quietly drifted like Nikhil's? This article is educational and not personalised investment or tax advice. Mutual fund investments are subject to market risk; please consider your own goals or consult a registered advisor.
Frequently asked questions
What does rebalancing a portfolio actually mean?
Rebalancing means resetting your investments back to the mix you originally chose. Say you decided on 60% equity and 40% debt. If stocks do well, equity might grow to 75% of your portfolio — which means you're now carrying far more risk than you planned, often without realising it. Rebalancing brings it back to 60:40 by trimming the part that's grown too big and topping up the part that's shrunk. It's not about chasing returns; it's about keeping your risk level where you're comfortable, so a market fall doesn't hurt more than you bargained for.
How often should I rebalance my portfolio?
There's no single magic number, but two simple approaches work for most people. The first is calendar-based: check once a year (many people use a birthday or the start of the financial year as a reminder) and reset if things have drifted. The second is threshold-based: rebalance only when any asset class drifts more than, say, 5 percentage points from its target — so you act when it matters, not on a fixed date. Doing it too often racks up taxes and effort for little benefit; never doing it lets risk quietly pile up. Once a year, or on a 5% drift, is a sensible middle path for a beginner.
Does rebalancing trigger tax in India?
It can, because selling equity mutual fund units to rebalance is a redemption, and gains are taxable — short-term capital gains if held under a year, long-term if held longer, each at their own rate. That's exactly why a smart way to rebalance is to steer *new* money rather than sell: direct your fresh SIPs and lumpsums into whichever asset class has fallen below target, nudging the mix back without booking gains. When you do have to sell, using your annual long-term capital gains exemption thoughtfully helps keep the tax bill down. This is general information, not personalised tax advice.
Can't I just leave my winners to run instead of rebalancing?
You can, and in a long bull run that even feels smart — but it quietly changes what you own. Letting equity balloon from 60% to 80% means that when the market eventually corrects, your portfolio falls much harder than the balanced one you designed, often right when you can least afford it. Rebalancing is the unglamorous discipline of selling a little of what's expensive and buying a little of what's cheap — the opposite of what fear and greed tell you to do. It won't maximise returns in a one-way market, but it keeps you from taking risks you never consciously agreed to.
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Disclaimer: This article is for educational and informational purposes only and does not constitute investment, financial, or tax advice. InvestDawn is not a SEBI-registered investment advisor. Please consult a qualified professional before making financial decisions. Read our full disclaimer.
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