Portfolio Rebalancing: When and How to Rebalance Funds
Portfolio rebalancing for mutual fund investors: calendar vs threshold methods, rebalancing with SIPs, tax and exit-load costs, and an exact worked example.
In this article
Portfolio rebalancing means selling or redirecting money so your equity, debt and gold return to the mix you originally chose. For most Indian mutual fund investors, a yearly check plus a rule of "act if any asset drifts more than 5 percentage points" is enough. The goal is to control risk, not to boost returns, and the best rebalancing method is usually the one that triggers the least tax.
Why portfolios drift
Suppose you choose 60% equity and 40% debt. Equity and debt rarely grow at the same pace, so after a strong year for stocks your portfolio might hold 66% equity without you buying a single extra unit. That sounds harmless, but it means a 30% market fall would now hurt more than you planned for.
Rebalancing forces two disciplined habits:
- Trimming what has run up, which locks in some gains.
- Adding to what has lagged, which buys at relatively lower prices.
If you have not yet set a target mix, start with stocks vs bonds vs gold and risk tolerance vs risk capacity. Rebalancing only makes sense once you know what you are rebalancing to.
Three ways to decide when to rebalance
| Method | How it works | Pros | Cons |
|---|---|---|---|
| Calendar | Review on a fixed date, e.g. every April | Simple, easy to remember | May act when drift is tiny |
| Threshold (band) | Act only when an asset drifts beyond, say, ±5 percentage points | Trades only when needed | Needs periodic monitoring |
| Calendar + threshold | Check yearly, act only if outside the band | Balances effort and cost | Slightly more rules to follow |
The combined method suits most people. Pick one date a year, check your mix, and do nothing if every asset is within its band.
Worked example: a 60:40 portfolio after a strong equity year (illustrative)
All returns below are illustrative assumptions, not forecasts.
Starting point: ₹10,00,000 split ₹6,00,000 in equity funds and ₹4,00,000 in debt funds.
After one year: equity rises 40% and debt rises 7%.
| Asset | Start | Return (illustrative) | End value | Share of portfolio |
|---|---|---|---|---|
| Equity | ₹6,00,000 | 40% | ₹8,40,000 | 66.25% |
| Debt | ₹4,00,000 | 7% | ₹4,28,000 | 33.75% |
| Total | ₹10,00,000 | ₹12,68,000 | 100% |
Equity is 6.25 percentage points above target, outside a ±5 point band, so you act.
- Target equity: 60% × ₹12,68,000 = ₹7,60,800
- Amount to move: ₹8,40,000 − ₹7,60,800 = ₹79,200
- New debt: ₹4,28,000 + ₹79,200 = ₹5,07,200, which is exactly 40% of ₹12,68,000
What does the sale cost in tax?
Your equity holding cost ₹6,00,000 and is worth ₹8,40,000, so gains make up ₹2,40,000 ÷ ₹8,40,000 = 28.57% of its value. Assuming all units are equally in profit, selling ₹79,200 realises:
- Gain: ₹79,200 × (2,40,000 ÷ 8,40,000) = ₹22,628.57
If those units were held more than 12 months and you have no other equity gains this year, the gain sits inside the ₹1.25 lakh long-term capital gains exemption, so tax = ₹0. If the units were held 12 months or less, the gain is short-term and taxed at 20%: ₹22,628.57 × 20% = ₹4,525.71, plus 4% cess of ₹181.03 = ₹4,706.74.
That gap is why the timing of a rebalance matters as much as the decision to rebalance. In reality the fund house redeems your oldest units first (first-in, first-out), so the actual gain depends on which units go.
Rebalancing without selling: use your SIP
If you invest every month, you can often avoid selling altogether.
Continuing the example: suppose you invest ₹20,000 a month by SIP, normally split ₹12,000 to equity and ₹8,000 to debt. If you send the full ₹20,000 to debt instead, you need ₹79,200 ÷ ₹20,000 = 3.96, so about four months to close the gap, ignoring market moves in between.
This method is free of tax and exit loads. Its weakness is speed: if the drift is large relative to your monthly investment, it can take many months. A practical approach is to redirect SIPs first and sell only what is left over at the yearly review. The SIP calculator helps you see how quickly monthly contributions add up.
The costs of rebalancing
| Cost | When it applies (as of October 2026) | How to reduce it |
|---|---|---|
| Equity STCG | 20% on equity fund gains held 12 months or less (Section 196 of the Income-tax Act, 2025, old Section 111A) | Sell units older than 12 months first |
| Equity LTCG | 12.5% on gains above ₹1.25 lakh a year (Section 198, old 112A) | Spread sales across financial years |
| Debt fund gains | Units bought on or after 1 April 2023 taxed at your slab rate, any holding period | Rebalance into debt with new money where possible |
| Exit load | Often about 1% on equity funds redeemed within 12 months; varies by scheme | Check the scheme information document |
| Switches | A switch between schemes, even within one AMC, is a redemption plus a purchase | Treat it like a sale for tax |
For the full tax picture, see capital gains tax on mutual funds.
Tax-smart rebalancing habits
- Use the yearly ₹1.25 lakh LTCG exemption deliberately. A rebalance late in the financial year and another early in the next one can each use a fresh exemption.
- Rebalance into debt with new money rather than selling debt to buy equity when markets fall, if you can.
- Avoid switching debt units bought before 1 April 2023 without checking: those may still qualify for 12.5% long-term tax after 24 months, while new debt units are taxed at slab rates.
- Do not let tax paralyse you. If equity has drifted far above target, paying some tax to restore your intended risk can still be the sensible choice.
Let the fund do it: auto-rebalancing options
Some fund categories rebalance inside the scheme, so you do not trigger capital gains on each adjustment:
- Balanced advantage (dynamic asset allocation) funds shift between equity and debt according to a model.
- Multi-asset allocation funds hold at least three asset classes, such as equity, debt and gold.
- Life cycle funds, a category introduced by SEBI's February 2026 categorisation circular, follow a glide path that cuts equity as a target date approaches.
The trade-off is control. You accept the fund's model rather than your own target, and the fund's tax treatment depends on its average equity share. These can suit investors who know they will not rebalance on their own.
Rebalancing across goals
Rebalance each goal's money separately rather than lumping everything together. Money for a home down payment due in two years should not be treated like retirement money due in 25 years. As a goal gets close, many investors move gradually from equity to debt instead of waiting for a single rebalance date. An emergency fund sits outside this process entirely and should stay in safe, liquid places.
Common mistakes
- Rebalancing too often. Monthly tinkering racks up tax and exit loads.
- Using rebalancing to time the market. Changing the target itself because of headlines is not rebalancing.
- Ignoring overlap. If your equity funds duplicate each other, fix that first; see mutual fund portfolio overlap.
- Forgetting EPF, PPF and FDs. They are part of your debt allocation even though they are not mutual funds.
Key takeaways
- Rebalancing restores your chosen equity–debt–gold mix and keeps risk where you planned it.
- A yearly review plus a ±5 percentage point band works for most investors.
- In the illustration, a 60:40 portfolio drifted to 66.25% equity; moving ₹79,200 restored it, realising ₹22,628.57 of gains.
- Redirecting SIPs is the cheapest way to rebalance; selling triggers capital gains tax and possibly exit loads.
- As of October 2026, equity gains are taxed at 20% (short term) or 12.5% above ₹1.25 lakh (long term), and post-April 2023 debt units at your slab rate.
Frequently asked questions
How often should I rebalance my mutual fund portfolio?
Once a year is enough for most investors, or whenever an asset class drifts more than about 5 percentage points from its target. Rebalancing more often adds tax and exit-load costs without a clear benefit.
Is rebalancing taxable in India?
Yes, if you sell units. Every redemption or switch between schemes is a sale for tax. As of October 2026, equity fund gains are taxed at 20% within 12 months and 12.5% above Rs 1.25 lakh a year after 12 months, while debt fund units bought from April 2023 are taxed at your slab rate.
Can I rebalance without selling?
Often, yes. Redirect new SIP money or fresh lumpsums into the underweight asset until the mix is back near target. This avoids tax and exit loads, though it works slowly if the drift is large.
Do hybrid funds rebalance automatically?
Balanced advantage, multi-asset and the new life cycle funds rebalance inside the scheme, so you do not trigger tax on each adjustment. You give up control over the exact mix, and the scheme's own tax treatment depends on its equity share.
Does rebalancing increase returns?
Not necessarily. Its main job is to keep your risk at the level you chose. In a long rising equity market, rebalancing can lower returns because it trims the best-performing asset.
This article is for general education and is not personalised financial, tax or legal advice. Rates and rules are as of 19 Oct 2026; confirm current terms with your lender, AMC or a qualified adviser.
