Rebalancing by rule, not mood

Imagine Asha keeps two plants on her windowsill and wants them to stay roughly the same height. One plant shoots up fast; the other grows slowly. Every month, on a fixed day, she trims a little off the tall one and gives extra water and care to the short one. She does not do this because she feels like it. She does it on a schedule, by a rule, so the two plants stay balanced. Some months trimming the tall one feels wrong - it is the healthy, happy plant! But the rule keeps her garden steady.

Deepak Shenoy, an Indian investor and writer who explains money in simple words, teaches this exact habit for your money. It is called rebalancing. You decide, calmly, on a target mix - say, so much in shares and so much in safer assets. Over time, one part grows bigger than the other and your mix drifts away from the target. Rebalancing means, on a fixed schedule, you trim the part that has grown too big and top up the part that has shrunk, bringing the mix back to your chosen target.

The key word is rule, not mood. This study is about why doing this on a fixed schedule - like Asha with her plants - is calmer and often wiser than doing whatever your feelings tell you as prices jump around.

Picture your money as two buckets. One bucket is shares (which can grow fast but also fall). The other is a safer asset like fixed deposits (steadier, calmer). You choose a target - let us say half in each, a 50–50 line.

Now time passes. Suppose shares do very well and grow. The shares bucket swells; the safe bucket stays roughly the same. Your mix, which you set at 50–50, has quietly drifted to maybe 65–35. Without noticing, you now have more riding on shares than you chose to - you are taking more risk than you planned, just because prices moved.

Rebalancing fixes this. On your fixed day, you trim the swollen shares bucket back down and pour that money into the shrunken safe bucket, until both are back at the 50–50 line.

Here is the quiet magic in it. To trim the bucket that grew, you sell a little of what went up - that is, you sell high. To top up the bucket that shrank, you buy a little of what went down or lagged - that is, you buy low. Rebalancing makes you do the wise thing (sell a bit of the expensive, buy a bit of the cheap) automatically, by rule - even though your feelings usually want the opposite. When shares are soaring, your feeling says "put more into shares!" The rule says the calm, boring thing: trim them back to the line. That is why Shenoy stresses it is a rule, not a mood. The rule quietly makes you act against the crowd's excitement, without you having to be brave in the moment.

illustrative Two savers, Priya and Kabir, each start with ₹2,00,000 split 50–50: ₹1,00,000 in shares, ₹1,00,000 in a safe asset.

Priya rebalances once a year, by rule. Kabir just lets it ride and follows his feelings.

Year one, shares boom and rise a lot. Priya's shares bucket swells past the line, so on her fixed day she trims some shares back to safe - locking in a little of the gain and returning to 50–50. Kabir, feeling great, lets his shares run and even feels tempted to add more, so he is now heavily tilted toward shares.

Year two, shares fall hard in a crash. Because Priya had trimmed back to 50–50, only half her money took the full hit, and she had safe money ready - so, following her rule, she now tops up shares while they are cheap. Kabir, who was tilted heavily into shares right before the fall, takes a much bigger hit, panics, and sells low.

Read what actually helped Priya. She was not smarter about the future - neither of them knew the crash was coming. The rule made her trim before the fall (so less of her money was exposed) and buy during the fall (so she picked up cheap shares), purely because those actions bring the mix back to the line. Kabir's feelings did the exact opposite at both moments: piled in near the top, fled near the bottom. The rule turned ordinary discipline into buying low and selling high, automatically. That is the whole quiet point of rebalancing.

Rebalancing can lower your ups as well as your downs. By trimming the part that is racing ahead, you also give up some of its future run if it keeps soaring. In a long, one-way boom, a rebalancer earns a bit less than someone who just let their winners run. The trade is fair: you accept slightly smaller highs in exchange for a steadier, safer ride. But do not expect rebalancing to always "beat" letting winners run - that is not its job. Its job is steadiness.

Doing it too often causes its own problems. Every time you trim and buy, there can be small costs and taxes. If you rebalance every week in a panic, those little costs add up and the fiddling can hurt. This is why it is a fixed schedule - say once a year, or when the mix drifts past a set gap - not a daily habit. The rule protects you from over-doing it as much as from under-doing it.

The hard part is obeying it when it feels wrong. Rebalancing asks you to sell some of your best-performing asset (which feels like a mistake) and buy more of your worst (which feels scary). In the moment, both feel wrong - that is exactly why it works, and exactly why many people abandon it. Writing the schedule down beforehand, in a calm moment, is what makes it possible to follow when the moment comes.

Rebalancing fits Indian savers well because our markets, like all markets, swing between excitement and fear - and our surroundings make both feelings louder. When shares boom, everyone at a family gathering is boasting about their gains, and the pull to pile in is strong. When they crash, the same voices turn fearful, and the pull to flee is strong. A written rebalancing schedule is a calm anchor against both pulls. Many Indians already hold a natural mix - some shares, some fixed deposits, some gold - so rebalancing simply adds a fixed day to gently bring that mix back to the target you chose.

But be clear about the limits. Rebalancing cannot promise a profit - if the whole market has a poor decade, a rebalanced mix can still do poorly. It cannot tell you what your target mix should be; that depends on your own goals, age, and how much of a fall you can calmly bear, and only you can decide that. And it does not remove risk - it manages it, keeping you from drifting into far more risk than you chose. Used as a calm, scheduled habit - not as a way to outsmart the market - it quietly keeps an ordinary saver from the two classic mistakes: over-betting at the top and fleeing at the bottom.

• Choose a target mix in a calm moment. Decide roughly how much belongs in shares versus safer assets before prices start moving.
• Set a fixed schedule, not a mood. Rebalance on a chosen day (say once a year) or when the mix drifts past a set gap - not whenever you feel excited or scared.
• Trim what grew, top up what shrank. Bringing the mix back to the line quietly makes you sell a little high and buy a little low.
• Do not over-do it. Rebalancing every week racks up costs and stress; the schedule protects you from fiddling as much as from neglect.
• Expect it to feel wrong, and follow it anyway. Selling your winner and buying your laggard feels uncomfortable - that discomfort is the rule working.
• Remember it is for steadiness, not for beating the market. In a long boom it may earn a little less; its gift is a calmer, safer ride.