How to Rebalance Your Portfolio in India: A Practical Step-by-Step Guide

What Rebalancing Actually Means

Portfolio rebalancing is the act of restoring your portfolio to its target asset allocation after market movements have pushed it away. If you started with 70% equity and 30% debt, and a strong equity rally has pushed the split to 80/20, rebalancing means selling some equity and buying debt until the ratio returns to 70/30.

It sounds mechanical, but it encodes a powerful habit: selling what has risen and buying what has fallen. That is the opposite of what most retail investors do. Most people chase performers and abandon laggards — rebalancing forces the reverse.

Why Portfolios Drift

Different asset classes grow at different rates. Equity (mutual funds, direct stocks) can compound at 12–15% in good years; debt funds might return 6–7%. Over time, the faster-growing asset takes up more and more of the portfolio. Left unchecked:

• Risk rises silently. A 70/30 portfolio that drifts to 85/15 has 50% more equity risk than intended.
• You buy high by default. The overweight asset is expensive because it has already run up.
• Goals misalign. A conservative portfolio built for a 5-year goal inadvertently becomes aggressive.

When to Rebalance

There are two common triggers:

Time-based: Review and rebalance once a year, regardless of how much the portfolio has moved. Simple to implement, low transaction cost, and research suggests it produces outcomes close to optimal.

Threshold-based: Rebalance whenever any asset class drifts more than 5% from target (e.g., equity rises from 70% to 75% or falls to 65%). This is more responsive but requires monitoring.

For most SIP investors, once a year is sufficient. The Indian tax year ends on 31 March — reviewing in February or March lets you also plan advance tax and ELSS investments simultaneously.

Calculating Drift: A Worked Example

Ananya started investing in January 2024 with ₹10 lakh, split:

• Large cap fund: ₹4,00,000 (40%)
• Mid cap fund: ₹3,00,000 (30%)
• Liquid/short duration debt fund: ₹3,00,000 (30%)

By December 2024, market movements have changed the picture:

Target was 40/30/30. Actual is 37.5/32.8/24.8. Debt has drifted 5.2 percentage points below target — this crosses the 5% threshold.

To restore 40/30/30 on ₹12,18,000:

• Large cap target: ₹4,87,200 → needs ₹7,200 more
• Mid cap target: ₹3,65,400 → needs a sell of ₹54,600
• Debt target: ₹3,65,400 → needs ₹47,400 more

Ananya should sell ₹54,600 of mid cap and split the proceeds into large cap (₹7,200) and debt (₹47,400).

Tax-Smart Rebalancing in India

Selling mutual fund units triggers capital gains tax. This is the biggest reason many investors avoid rebalancing — but the cost is often lower than they fear.

Equity funds:

• Held < 1 year: Short-term capital gains (STCG) taxed at 20%
• Held ≥ 1 year: Long-term capital gains (LTCG) above ₹1.25 lakh per year taxed at 12.5%

Debt funds (purchased after 1 April 2023):

• Gains taxed at your income tax slab rate regardless of holding period

Strategies to minimise tax:

1. Redirect new SIP contributions. Instead of selling the overweight fund, pause or reduce its SIP and increase the SIP into the underweight fund. This avoids triggering any capital gains at all. It works best when the drift is modest and you have several years ahead.

2. Use annual LTCG exemption. Each financial year, LTCG up to ₹1.25 lakh is exempt. If your rebalancing sale generates gains below this, there is zero tax. Book gains up to the exemption limit every year even if you don't need to rebalance — this resets your cost basis.

3. Time the sale to cross one year. If units are 10 months old and you need to sell, wait 2 more months to move from STCG at 20% to LTCG at 12.5%.

4. Rebalance inside NPS or EPFO. NPS lets you switch between equity (E), corporate debt (C), and government bonds (G) tiers without triggering personal capital gains. If you hold NPS, do your debt/equity rebalancing there first.

The SIP Redirection Method

This is the gentlest rebalancing tool available. Suppose equity has drifted from 70% to 78%:

• Month 1–6: Stop new SIP into equity funds. Route the full SIP amount into a debt or liquid fund.
• Month 7 onward: Resume normal allocation once equity settles back near 70%.

No selling, no capital gains, no paperwork. This works particularly well for investors with ₹20,000+ monthly SIPs where new contributions are a meaningful fraction of the total corpus.

The Takeaways

• Portfolios drift naturally as different assets grow at different rates — left unchecked, your risk profile silently changes.
• Annual rebalancing is sufficient for most investors; threshold-based (5% drift) is useful for larger portfolios.
• Calculate drift by comparing current percentages to target, then buy the underweight asset and trim the overweight.
• Redirect SIP contributions first — it avoids capital gains entirely and works well for moderate drift.
• Use the ₹1.25 lakh annual LTCG exemption actively — booking gains up to this limit each year resets your cost basis at zero tax cost.
• NPS switching between E/C/G tiers is completely tax-free — use it as your first rebalancing lever if you hold NPS.