Rebalancing Your Portfolio: When and How to Actually Do It

Last updated: 24 October 2026. Tax rates checked on this date.

Markets never move in a straight line. Equity funds (which invest mostly in company shares) may rise fast. Debt funds (which invest mostly in bonds, meaning loans to governments or companies) grow slowly. So your portfolio slowly changes shape. A plan that began as 60% equity can become 67% equity without any action from you. That means more risk than you chose. Rebalancing fixes this. It is not about predicting the market. This guide explains when to rebalance, how to do it, and what tax you may pay.

Which rebalancing method should you use?

Drift means how far your mix has moved from your plan. You can choose one of three simple ways to decide when to act.

What does portfolio rebalancing mean?

Asset allocation is how you split your money between equity, debt, and other assets like gold. Rebalancing means bringing that split back to your plan.

Say your plan is 60% equity and 40% debt. After a strong year, equity grows to 67%. The drift is 7 percentage points. A percentage point is one step in a percentage. So 67% minus 60% is 7 points.

Why does this matter? A higher equity share means bigger falls when markets drop. So drift can push your portfolio past the risk you can handle. It can also hurt a goal that is close, such as school fees due in two years.

When should you rebalance?

Research gives a clear hint. Vanguard studied a 50-50 global stock and bond portfolio from 1926 to 2014. Yearly checks with a 5% band gave the lowest swings in value. Average returns stayed close across methods.

Vanguard’s 2022 research adds more. It says monthly or quarterly checks are too frequent. It also says checking only every two years is too rare.

These studies use US and global data, not Indian funds. But the idea holds here. Every trade can add cost and tax, so fewer planned trades usually work better.

Also review your mix when life changes. A new baby, a job change, or a goal coming close can all change the mix you need. When a goal is near, think about moving that goal’s money to debt funds.

How do you rebalance step by step?

1. Write your target mix. For example, 60% equity and 40% debt. Base it on your goals and how much risk you can handle.
2. Add up each asset class. List all your funds with today’s value. Total the equity funds and the debt funds.
3. Find the drift. Divide each total by your full portfolio value. Compare the result with your target.
4. Pick your method. You can sell and buy, or you can redirect new money.
5. Check tax and exit load before you sell. The tax section below shows how.
6. Write down what you did. Note the date, the drift, and the amounts for next year.

Method 1: Sell some and buy some

You sell part of the asset that grew. Then you buy the asset that fell behind. This fixes the mix fast. But it can trigger tax.

Method 2: Redirect new money

You stop adding to the asset that is too high. All new money goes to the asset that is too low. A Systematic Investment Plan (SIP) means you invest a fixed amount every month. So you can point your monthly SIP to the lagging asset. This avoids selling. But it works slowly.

Worked example: a ₹10 lakh portfolio

Let us use made-up numbers to show the method. They are not forecasts.

Here, equity grew 40% and debt grew 6%. Equity is now 66.5%. That is 6.5 points above target, so it crosses the 5-point band.

To return to 60/40, equity should be ₹7,58,400 and debt should be ₹5,05,600. So you move ₹81,600 from equity funds to debt funds.

What tax would you pay on this sale?

Say you sell ₹81,600 of equity fund units that you bought in one lump sum. The original cost of those units is about ₹58,286. So your profit is about ₹23,314.

If you held the units for over 12 months, this profit is under the ₹1.25 lakh yearly limit. So the tax is nil, if you have no other equity gains this year. If you held them for 12 months or less, the tax is 20%. That is about ₹4,663, plus cess.

With SIPs, each instalment has its own purchase date and holding period. So check your statement before you sell.

What if you do not sell at all?

Now try Method 2. Equity stays at ₹8,40,000. To reach 60/40, your total must become ₹14,00,000. So debt must reach ₹5,60,000. You need ₹1,36,000 more in debt funds. At ₹20,000 a month, that takes about 7 months, if nothing else changes. In real life, markets keep moving. So recheck as you go.

What tax and cost can rebalancing bring?

Selling or switching fund units counts as a redemption. A switch between two schemes of the same fund house is also a sale. So capital gains tax can apply on the scheme you leave.

Cess and surcharge may apply on top of these rates. Other fund types, such as hybrid, gold, and international funds, follow different rules.

Budget 2026 did not change these rates. The Income Tax Act 2025 replaced the 1961 Act from 1 April 2026. It uses new section numbers, but the rates above stayed the same. Please verify this information from the latest official source, such as the Income Tax Department website.

Exit load is a small fee some funds charge if you sell units within a set period. Each fund sets its own period. A switch counts as a sale for exit load too. Each SIP instalment also has its own exit load period. So read the scheme document before you rebalance. You can learn more about scheme rules on the AMFI website and the SEBI website.

What mistakes should you avoid?

• Checking too often. Monthly checks often lead to extra trades, cost, and tax.
• Selling in panic. Rebalancing follows a rule, not a news headline.
• Ignoring tax. Look at your gains for the year before you sell.
• Mixing goals. Keep a separate target mix for each goal, such as retirement and school fees.
• Forgetting to update the plan. Review your target mix when your goals change.

Frequently asked questions

How often should I rebalance my mutual fund portfolio?

Research suggests one check a year, or two at most, is enough for most long-term investors. Pick a fixed date, such as April or your birthday. Rebalance only if an asset class has drifted 5 percentage points or more from your target. Checking every month usually adds trades, cost, and tax without much benefit.

What is the 5% rule in portfolio rebalancing?

The 5% rule says you rebalance when an asset class moves 5 percentage points away from its target. If your target equity share is 60%, you act when equity goes above 65% or below 55%. Researchers often use 5% as a balance between risk control and trading cost. You can choose a tighter or wider band.

Does rebalancing trigger tax on mutual funds?

Yes, it can. Selling or switching units counts as a redemption, so capital gains tax may apply. As of 24 October 2026, equity fund gains held over 12 months pay 12.5% above ₹1.25 lakh a year. Gains within 12 months pay 20%. Debt funds bought on or after 1 April 2023 pay your slab rate. Please verify this information from the latest official source.

Can I rebalance without selling any units?

Yes. Send all new money to the asset class that is below target. For example, point your monthly SIP to a debt fund until the mix returns to plan. This avoids tax and exit load on sales. But it works slowly, so it suits small drifts better than large ones.

Is switching between mutual fund schemes a taxable event?

Yes. A switch is a sale from one scheme and a fresh purchase in another. So capital gains tax can apply on the scheme you leave. Exit load can apply too, if you switch within the exit load period. Check the scheme document and your holding dates before you switch.

Do hybrid funds need rebalancing?

A hybrid fund holds equity and debt in one scheme. The fund manager adjusts the mix within the scheme’s rules. So you do not need to rebalance inside the fund. But check how the fund fits your overall plan once a year. Tax rules for hybrid funds differ from pure equity funds, so verify them first.

Related guides and services

• Mutual fund and SIP investing in Chennai
• Portfolio review and investment monitoring
• Goal-based financial planning
• Retirement planning
• Free financial calculators

Mutual Fund investments are subject to market risks, read all scheme related documents carefully. This content is for illustrative and educational purposes only. We deal in Regular Plans.