The art of asset allocation: it decides more than fund selection ever will

Investors spend most of their attention on which fund to buy. That is the smallest of the decisions in front of them.

How much of your money sits in equity versus debt versus gold determines most of what your portfolio does — its return, and far more importantly its worst year. Choosing between two well-run flexi cap funds is a rounding error beside choosing whether 40% or 80% of your money is in equity at all.

Setting the split

There is no formula that knows your situation, and the ones offered as rules (“100 minus your age in equity”) are starting points rather than answers. What actually determines it:

• When you need the money. This dominates. Money needed within three years has no business in equity, whatever your risk appetite — the drawdown history of any equity category will tell you why. Money you will not touch for fifteen years can absorb a bad decade.
• Whether your income is stable. A salaried job with a secure employer is itself a bond-like asset. A commission-based income that falls when markets fall is not, and argues for more defensive positioning.
• What you will actually do in a 40% fall. Not what you believe you will do. An allocation you abandon at the bottom is worse than a more conservative one you keep.

Gold deserves a line of its own: it is not a return engine, it has had long flat decades, and it earns its place because it tends not to move with Indian equities — which is worth something exactly when everything else is falling. A single-digit to low-teens allocation is the common view; treating it as a growth asset is not.

Why rebalancing is the mechanical part

Set 60% equity and 40% debt, then leave it alone. After a strong equity run it is 75/25 — and your portfolio is now materially riskier than the one you chose, without you having decided anything.

Rebalancing sells the winner back to target and buys the laggard. It sounds backwards and it is doing two useful things: it holds your risk where you set it, and it enforces sell-high-buy-low as a rule rather than a judgement call. Nobody who rebalances has to have a market view.

How often, and on what trigger

Two disciplines, and the sensible answer combines them:

• Calendar — check once a year, on a date you fix in advance. Simple, and enough for most long-term portfolios.
• Threshold (bands) — act only when an asset class drifts beyond a set band, commonly around ±5 percentage points from target. This ignores noise and forces action when it matters.

The practical version: check annually, act only if something has drifted outside its band. More frequent rebalancing does not improve outcomes and does increase cost — and in India, cost here means tax.

The Indian complication: rebalancing is a taxable event

In a tax-sheltered account rebalancing is free. In a taxable one it is not, and the rules make some rebalances expensive:

• Equity units sold under 12 months: 20% short-term.
• Equity units sold at 12 months or more: 12.5%, above the ₹1,25,000 annual exemption.
• Most debt funds: slab rate, whatever the holding period.

So a mechanical annual rebalance can hand over a real slice of the gain it just locked in. Three ways to blunt that, in order of preference:

1. Rebalance with new money. Direct your SIPs and any lump sums into the under-weight asset instead of selling the over-weight one. This costs nothing in tax and, for anyone still accumulating, does most of the work on its own.
2. Use the exemption deliberately. ₹1,25,000 of long-term equity gain a year is exempt. Realising up to that limit while rebalancing is free.
3. Widen the bands. A ±5 band that triggers every year may be worth loosening to ±7 or ±10 if the tax cost of each trip is material.

What not to do is skip rebalancing entirely because of the tax. Paying 12.5% on a gain is a smaller problem than carrying 85% equity into a bear market you had planned for 60%.

A note on doing it inside one fund

A multi-asset or dynamic-allocation fund rebalances internally, and internal rebalancing is not a taxable event for you — the fund transacts, not you. That is a genuine advantage and the main argument for these categories.

The trade is that the allocation is now the manager’s decision rather than yours, and you cannot see or override it. Some people are better off with that; some are not. Either way, know which you have chosen.

Next: how many funds you actually need to express an allocation — the answer is smaller than most portfolios.

Key takeaway

How much sits in equity determines your outcome and your worst year far more than which equity fund you picked. Set the split from your horizon and your behaviour, not a formula, then hold it with bands rather than hunches — and rebalance with new money before you rebalance with a sale, because in India the tax is the real cost of the discipline.