What is Portfolio Rebalancing?
Portfolio rebalancing is the process of realigning your investment portfolio back to your original asset allocation after it has drifted due to different growth rates in different investments.
For example: You start with 70% equity and 30% debt. After a strong equity bull run, your portfolio is now 85% equity and 15% debt. Your risk profile hasn't changed, but your portfolio is now significantly riskier than intended. Rebalancing means selling some equity and buying more debt to restore the 70/30 ratio.
Rebalancing is not about maximising returns. It's about ensuring your portfolio stays aligned with your risk tolerance and goals — especially as you age.
Why Rebalancing Matters
- Risk control: Without rebalancing, equity growth naturally increases your equity allocation over time — making your portfolio riskier than intended
- Buy low, sell high discipline: Rebalancing forces you to sell what has grown (expensive) and buy what has lagged (cheaper) — a contrarian approach that improves long-term returns
- Emotional discipline: A systematic rebalancing rule removes the emotion from "should I book profits now?"
- Retirement approach: As you near retirement, reducing equity allocation through rebalancing protects accumulated wealth
When Should You Rebalance?
There are two main approaches:
1. Calendar-Based Rebalancing
Rebalance on a fixed schedule — typically once a year, in April (start of financial year) or October. Simple, predictable, and avoids emotional timing decisions. Works well for most investors.
2. Threshold-Based Rebalancing
Rebalance whenever any asset class drifts more than a set threshold from target — typically 5–10%. For example, if your equity target is 70% and it reaches 80%, rebalance back to 70%. More responsive to market movements, but requires closer monitoring.
How to Rebalance Without Triggering Unnecessary Tax
The challenge with rebalancing equity mutual funds is that redemptions trigger capital gains tax. Smart strategies to minimise this:
- Use new SIP contributions: Instead of selling overweight assets, redirect new SIP contributions to underweight assets until allocation is restored
- Wait for LTCG holding period: If equity units are close to 12-month holding, wait until they qualify for LTCG (10%) rather than STCG (15%)
- Use ₹1L annual LTCG exemption: Book up to ₹1L of gains tax-free every year as part of rebalancing
- Rebalance via SWP: Instead of lump-sum redemption, set up a brief SWP from overweight funds and invest proceeds into underweight funds
Sample Rebalancing Scenarios
| Life Stage | Target Allocation | Rebalancing Action |
|---|---|---|
| Age 25–35 (Early career) | 85% equity, 15% debt | Annual review, redirect SIPs |
| Age 35–45 (Mid career) | 75% equity, 25% debt | Annual rebalancing, use new contributions |
| Age 45–55 (Pre-retirement) | 60% equity, 40% debt | Gradual shift, threshold-based |
| Age 55–60 (Retirement approach) | 40% equity, 60% debt | Aggressive glide path into debt/hybrid |
| Retired (60+) | 20–30% equity, 70–80% debt | SWP from balanced funds, bucket strategy |
Rebalancing Within Equity: Large Cap vs Mid Cap
Rebalancing isn't just about equity vs debt. Within equity, you may also need to rebalance between:
- Large cap vs mid cap vs small cap
- Domestic equity vs international equity
- Growth-oriented vs value-oriented funds
After a mid-cap bull run, your mid-cap allocation might be 40% of equity when you wanted 25%. Rebalancing back reduces concentration risk without abandoning the asset class.
Common Rebalancing Mistakes
- Rebalancing too frequently: Monthly rebalancing incurs transaction costs and tax drag. Annually is usually sufficient.
- Rebalancing based on emotions: "Markets look too high" isn't a rebalancing trigger. Stick to your predetermined schedule or threshold.
- Ignoring exit loads: Don't redeem funds with active exit load periods just to rebalance — wait for the exit load period to end.
- Not considering tax: Always calculate post-tax impact before deciding on redemption amount.
Want help setting up a systematic rebalancing schedule for your portfolio? Book a free consultation with our AMFI-registered MFD.