Rebalancing

Rebalancing was the discipline that kept a portfolio's risk profile aligned with its original intent over time. Left unattended, a portfolio that started with a 70:30 equity-to-debt ratio would drift considerably after years of differential returns. If equities compounded at 12 percent while debt grew at 7 percent, the equity weight would expand naturally, increasing the portfolio's risk exposure beyond what the investor initially accepted. Rebalancing corrected this drift by trimming the over-weight asset class and reinvesting in the under-weight one.

Two primary approaches to rebalancing were calendar-based and threshold-based. Calendar rebalancing involved reviewing and adjusting the portfolio at fixed intervals — annually, semi-annually, or quarterly. Threshold rebalancing involved triggering a review whenever an asset class drifted beyond a defined band, such as ±5 percentage points from the target. Research on Indian and global markets suggested that annual or threshold-based rebalancing produced similar outcomes over long periods, while more frequent rebalancing incurred higher transaction costs without commensurate benefit.

In India, rebalancing carried tax implications that shaped strategy significantly. Selling equity mutual fund units held for more than one year triggered LTCG tax at 12.5 percent on gains above Rs 1.25 lakh. Selling before one year triggered short-term capital gains tax at 20 percent. This made mechanical, frequent rebalancing costly and led many advisors to recommend rebalancing primarily through the accumulation phase — directing new SIP contributions toward under-weight asset classes rather than selling over-weight ones, which achieved the same rebalancing effect without creating taxable events.

Rebalancing also had a contrarian quality that many investors found psychologically difficult. Selling equities after a strong bull run to buy debt or gold felt counterintuitive when sentiment was euphoric. Similarly, buying equity during a sharp market downturn to restore the target allocation required discipline against the instinct to reduce risk when fear was highest. Studies consistently showed that investors who maintained rebalancing discipline through full market cycles achieved better risk-adjusted outcomes than those who let allocations drift unchecked.

For investors using NPS, the choice between Active Choice and Auto Choice (lifecycle fund) was essentially a decision about whether to rebalance manually or rely on the scheme's built-in lifecycle mechanism, which automatically shifted from equity to debt as the subscriber approached retirement age.