Rebalancing & Portfolio Review — When & How
Portfolio rebalancing is the process of realigning the portfolio's asset allocation back to the target allocation when market movements cause it to drift beyond...
Rebalancing & Portfolio Review — When & How
Portfolio rebalancing is the process of realigning the portfolio's asset allocation back to the target allocation when market movements cause it to drift beyond acceptable thresholds. For example, if a Moderate portfolio's target is 55% equity and 45% debt, but a strong equity rally pushes the actual allocation to 65% equity and 35% debt, rebalancing involves shifting 10% from equity back to debt. The two primary rebalancing approaches are calendar-based rebalancing (reviewing and adjusting on a fixed schedule, typically annually) and threshold-based rebalancing (rebalancing whenever any asset class drifts by more than 5-10% from target). In mutual fund portfolios, rebalancing is executed through switch transactions (redemption from overweight category and simultaneous purchase in underweight category), which have tax implications.
Rebalancing is often counter-intuitive because it requires selling what has performed well and buying what has underperformed. After a great equity bull run, the advisor is telling the client to move money FROM equity (which has given 25% returns) TO debt (which gave 7%). Every fibre of the client's being will resist this. Yet disciplined rebalancing has consistently been the single biggest differentiator between portfolios that survive market cycles and those that get destroyed. Rebalancing works for two key reasons: 1. It enforces "buy low, sell high" systematically. When equity rallies, rebalancing forces profit-booking and parking gains in debt. When equity crashes, rebalancing forces deployment of debt money into equity at lower prices. Over a full cycle, this adds 1-2% CAGR to portfolio returns compared to buy-and-hold. 2. It maintains risk control. A portfolio that started at 60% equity can become 80% equity after a 2-year bull run. At 80% equity, the portfolio will fall much harder in a correction than the client originally signed up for. Rebalancing prevents risk drift. Calendar-Based Rebalancing: A fixed date every year — April (after financial year end) or January (new year review) is recommended. On this date, actual allocation is compared with target allocation. If any asset class has drifted by more than 5%, rebalancing is triggered. This approach is simple, disciplined, and removes emotion from the decision. The downside is that rebalancing opportunities may be missed if a major market move happens mid-year. Threshold-Based Rebalancing: A threshold of ±5-10% is set, and rebalancing occurs whenever any asset class breaches it. If target equity is 60% and actual goes above 65% or below 55%, rebalancing is triggered immediately. This is more responsive but requires more frequent monitoring. The recommended practical approach is to combine both: monitor thresholds quarterly but conduct a comprehensive review annually. Critical Tax Consideration: In mutual funds, rebalancing means executing a switch (which is a redemption + fresh purchase). The redemption triggers capital gains tax. Equity fund switches after 1 year attract 12.5% LTCG (above ₹1.25 lakh exemption). Equity switches within 1 year attract 20% STCG. Debt fund gains are taxed at slab rate regardless of holding period. The tax impact must always be considered before executing — small allocation drifts (2-3%) may not justify the tax cost of rebalancing. When NOT to Rebalance: (1) When the drift is small (under 5%) — transaction costs and taxes outweigh the benefit. (2) When the client is within 1-2 years of a goal — at this point, de-risking toward debt is appropriate, not rebalancing back to equity. (3) In a systematic, prolonged correction where catching the exact bottom is impossible — rebalancing in tranches over 2-3 months is better than a one-shot switch. Annual Review Checklist for Distributors: 1. Compare actual allocation vs target — rebalance if drifted >5% 2. Review each fund's performance vs benchmark and category peers 3. Check if any fund manager changes have occurred 4. Assess if the client's goals or financial situation have changed 5. Increase SIP amounts in line with income growth (step-up) 6. Review insurance adequacy (especially after life events) 7. Tax harvest — book ₹1.25 lakhs LTCG annually tax-free if applicable 8. Document the review discussion and actions taken
A Practical Example
Consider the case of Sanjay Mehta, 45, who has a Moderate portfolio set up 2 years ago with target allocation: 55% equity, 35% debt, 10% liquid/gold. Portfolio value: ₹38 lakhs.
It is April — annual review time. After a strong equity rally, the actual allocation has drifted to: Equity: ₹24.7 lakhs (65%), Debt: ₹10.6 lakhs (28%), Liquid/Gold: ₹2.7 lakhs (7%). Equity has drifted 10% above target — rebalancing is clearly needed.
Tax Calculation:
The ₹3.8 lakh switch includes ₹1.2 lakhs in long-term capital gains (equity held >1 year). Since LTCG up to ₹1.25 lakhs is exempt, the entire gain is tax-free this time. The switch is executed with zero tax impact.
Post-rebalancing: Equity: ₹20.9 lakhs (55%), Debt: ₹14.4 lakhs (38%), Liquid/Gold: ₹2.7 lakhs (7%). Back on target.
Six months later, equity markets correct 18%. Sanjay's portfolio drops to ₹34 lakhs. New actual allocation: Equity: ₹16.3 lakhs (48%), Debt: ₹14.9 lakhs (44%), Liquid/Gold: ₹2.8 lakhs (8%). Equity has drifted 7% below target — a threshold breach.
Rebalancing Action:
Target equity: 55% of ₹34 lakhs = ₹18.7 lakhs
Switch ₹2.4 lakhs from debt to equity — effectively buying equity at 18% lower prices.
Result: Because of the April rebalancing, ₹3.8 lakhs was moved out of equity before the correction (selling high). Now ₹2.4 lakhs is being put back in at lower prices (buying low). Over the full cycle, this disciplined rebalancing adds meaningful alpha compared to a portfolio that was left untouched.
What Makes This Important
Frequently Asked Questions
Because nobody can predict when a bull run will end. History shows that every bull market eventually corrects — 2000, 2008, 2015, 2020, and 2022. A portfolio that has drifted from 60% to 75% equity will fall much harder in a correction. Rebalancing is not about predicting the top — it is about maintaining the risk level the client originally agreed to. It functions like an insurance policy: ideally it is not needed, but when it is, it saves the portfolio. The profits booked during rebalancing sit safely in debt, ready to be deployed back into equity during the next correction at lower prices.
🧠 Quick Quiz
3 questions to check your understanding
