Rebalancing is the process of returning your portfolio to its target allocation by selling assets that have grown above their target weight and buying those that have fallen below it. It is one of the few investment actions supported by both financial theory and behavioral evidence — yet most retail investors either never do it or do it reactively at the wrong time.
Why rebalancing works
Suppose your target is 70% equity / 30% debt. After a 3-year equity bull run, your portfolio is now 85% equity / 15% debt. Rebalancing forces you to sell 15% of your equity allocation (which has become expensive) and buy 15% more debt (which is now relatively cheaper). This is mechanically "selling high, buying low" — the ideal but usually emotion-driven action.
Research on Indian portfolios shows that annual rebalancing adds approximately 0.5–1.5% per year in risk-adjusted returns compared to "do nothing" portfolios, primarily by preventing runaway equity overweighting near market peaks.
When to rebalance
Calendar-based: Rebalance once a year, on a fixed date (e.g., every April 1 after the financial year close). Simple, predictable, low transaction cost.
Threshold-based: Rebalance whenever any asset class deviates by more than 5–10 percentage points from target. More responsive to large market moves but requires more monitoring.
For most Indian retail investors, annual calendar rebalancing is sufficient — it avoids over-trading, is compatible with tax planning (you can time the rebalance to minimize LTCG), and requires only one review per year.
Tax-efficient rebalancing in India
Rebalancing equity mutual funds triggers capital gains tax. To minimize this:
- Use new inflows for rebalancing: If you are still in the accumulation phase, direct new SIP contributions toward the underweight asset class instead of selling the overweight one.
- Harvest losses: If any fund is in a loss, sell it for rebalancing purposes — this crystallizes a capital loss that can offset other gains.
- Use annual LTCG exemption: The ₹1.25 lakh LTCG exemption per year allows you to rebalance some equity without tax.
- Rebalance within hybrid funds: BAFs and aggressive hybrid funds rebalance internally without triggering your personal tax liability.
What most investors get wrong
The biggest mistake: rebalancing based on market outlook. Selling equities because "markets look expensive" and calling it rebalancing is market timing in disguise. True rebalancing is mechanical — it triggers at a target deviation, regardless of your view on the market's direction.