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By Dhan Saarthi • 8 mins read
Most investors know they should rebalance their portfolio. Very few actually do it. And one of the biggest reasons? The fear of a tax bill.
That fear is not entirely wrong. Selling mutual fund units to rebalance does create a taxable event in India — either LTCG or STCG depending on how long you've held those units. But avoiding rebalancing altogether is a more expensive mistake than the tax you're trying to avoid.
The good news: there are ways to rebalance your portfolio without unnecessarily crystallising large tax liabilities. This article explains what rebalancing really means, when it matters most, and how to do it smartly in the Indian mutual fund context.
When you build a portfolio, you decide on a target allocation — say, 70% in equity mutual funds and 30% in debt funds. That ratio reflects your goals, risk tolerance, and time horizon at that point in time.
But markets don't stay still. After a strong equity bull run, your equity allocation might silently climb to 85% or more — without you adding a single rupee. Your portfolio has drifted away from the risk profile you originally set.
Rebalancing is the act of bringing your portfolio back to its intended allocation. It's not about timing the market. It's about staying consistent with your plan — especially when emotions push you to chase returns or hold on during corrections.
Left unchecked, allocation drift creates two problems that work against you at different times.
Consider a simple example. You started with a 70:30 equity-debt split in January 2023. Assume equity markets have run up significantly since then. Without any action on your part, your equity allocation could have grown to 80–85% of your portfolio — far above your intended risk level.
When markets correct, a drifted portfolio falls harder than your original risk profile was designed to handle. That's when investors panic and make emotional decisions — redeeming at a loss or stopping SIPs.
The core risk of not rebalancing: You end up with more risk than you planned for, without a proportionally higher expected return to justify it.
The reverse is also true. In a rising equity market, failing to rebalance means your debt component is underweight — reducing the cushion you were supposed to have for near-term goals.
The moment you sell mutual fund units to rebalance, you may owe tax on the gains. Here's how it works in India (as of the 2024–25 budget; please verify current rates before acting).
| Holding period | Gain type | Tax rate | Exemption |
|---|---|---|---|
| Under 12 months | STCG | 20% | None |
| Over 12 months | LTCG | 12.5% | ₹1.25 lakh per year [verify] |
⚠ Tax rates and exemption limits are subject to change with each Union Budget. Please verify current rules with a tax advisor before acting.
Short-term capital gains tax (STCG) is significantly higher than LTCG. If you sell equity fund units held for less than 12 months, you'll pay 20% on those gains. This is why thoughtless or reactive rebalancing — triggered by a market move — can be particularly costly.
The key insight: if you need to sell to rebalance, prioritise selling units that have completed 12 months of holding. This shifts your tax burden from STCG to LTCG, which is meaningfully lower.
The goal is not to avoid all taxes — some gain is inevitable and healthy. The goal is to avoid unnecessary tax by choosing how and when you rebalance.
Before selling anything, look at where your new SIP contributions or lump sum investments are going. If your equity allocation has drifted higher than your target, direct new investments entirely to your underweight asset class (typically debt or hybrid funds) until the balance is restored.
This approach generates zero tax because you are not selling — you are simply redirecting fresh money. It works best for gradual drift and for investors with regular monthly surpluses.
Gains from equity mutual funds up to ₹1.25 lakh per financial year are exempt from LTCG tax (verify this figure with the current year's rules). This limit resets every April.
A structured approach: each financial year, identify equity fund units held for over 12 months that you would want to trim as part of rebalancing. Redeem units generating gains up to the exemption limit. Reinvest the proceeds into your underweight category.
Over three to five years, this gradual approach can significantly correct a drifted portfolio with minimal or zero LTCG tax outgo.
A Systematic Transfer Plan (STP) allows you to move money from one mutual fund to another over a series of instalments rather than in one lump sum. Each instalment is treated as a separate redemption.
From a tax perspective, an STP spreads your redemptions across time. This means you may be able to stay under the annual LTCG exemption threshold each year if you plan carefully. It also reduces the STCG exposure by giving more units time to complete the 12-month holding period.
If some of your funds are sitting at a loss (unrealised), you can redeem those units to book the loss before the financial year ends. These losses can be offset against gains from other redemptions in the same year, reducing your net tax liability.
In India, short-term capital losses can be set off against both STCG and LTCG. Long-term capital losses can only be set off against LTCG — not STCG. Losses not fully utilised can be carried forward for up to 8 financial years.
This is a legitimate and commonly used technique, but it requires careful tracking of your cost basis and holding periods. Consult a tax professional before applying this at scale.
Before you rebalance, work through these questions:
Has my portfolio drifted by more than 5–10% from its target allocation?
Minor drift (1–3%) is not worth acting on. A 10%+ drift is a meaningful signal to rebalance.
Can I correct the drift using new investments without selling?
If yes, do this first. Zero tax, full control.
How much LTCG have I already booked this financial year?
If you're under the exemption limit, use the remaining headroom before March 31.
Are any of the units I'd be selling held for under 12 months?
If yes, consider waiting until they cross the 12-month threshold to qualify for LTCG instead of STCG.
Do I have any loss positions I could harvest to offset gains?
Review your entire portfolio before booking gains — losses in one fund can offset gains in another.
Would an STP work better than a one-time switch for a large rebalancing?
For significant rebalancing (₹5 lakh+), an STP over 6–12 months is generally more tax-efficient than a single lump redemption.
There are two sensible approaches — and most investors benefit from combining both.
| Approach | How it works | Best for |
|---|---|---|
| Calendar-based | Review every 12 months — typically at the start of the financial year | Most investors. Simple, low effort. |
| Threshold-based | Rebalance when any asset class drifts by more than 5–10% from its target | Investors comfortable tracking allocation quarterly. |
Avoid rebalancing in reaction to short-term market moves. A 5% market correction does not automatically mean your portfolio has drifted enough to warrant action. Check the actual allocation numbers — not just how the market feels.
Three mistakes are common — and all hurt.
Mistake 1: Never rebalancing to avoid tax. The tax cost of a well-planned annual rebalance is often a fraction of the risk you're accumulating by letting your portfolio drift. Over a five-year period, the cumulative cost of not rebalancing — in terms of volatility absorbed and goal misalignment — typically exceeds the tax saved.
Mistake 2: Rebalancing too frequently. Quarterly rebalancing sounds disciplined, but it generates unnecessary tax events and exit loads — especially when dealing with equity funds. Annual or threshold-based rebalancing is sufficient for most investors.
Mistake 3: Rebalancing across fund houses without checking overlap. Switching from one large-cap fund to another large-cap fund achieves little in terms of allocation correction and may add unnecessary tax and transaction costs. Rebalancing should work at the asset class level first.
Rebalancing is not about market timing — it is about maintaining the risk-return profile you originally chose. Done thoughtfully, it does not require a painful tax bill.
The framework is straightforward: redirect new investments first, use the annual LTCG exemption systematically, prefer STPs over lump switches for large rebalancing, and check for loss-offset opportunities before booking gains.
What the framework requires, though, is a clear picture of your current allocation, your target allocation, and the cost basis of your existing holdings. That's where a structured portfolio review makes the difference between guesswork and a plan.
MOFU — PORTFOLIO ACTION
Check your current allocation, see how far your portfolio has drifted, and find out whether it still matches your risk profile and financial goals.
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