Mutual Fund Portfolio Overlap: How to Check and Fix It

Portfolio overlap is the share of one mutual fund's holdings that also sits inside another fund you own. If two of your equity funds overlap by more than about 50%, the second fund is mostly giving you more of the same stocks, not more diversification. This guide shows how to calculate overlap, what SEBI's 2026 rules say about it, and how to clean up a cluttered portfolio without paying avoidable tax.

What portfolio overlap actually measures

Every equity fund publishes its full portfolio at least monthly on the fund house (AMC) website. Overlap compares two of those lists. The standard method is simple:

1. List the stocks both funds hold.
2. For each common stock, take the lower of its two weights.
3. Add those lower weights. The total is the overlap percentage.

Why the lower weight? Because that is the part of the position both funds genuinely share. If Fund A holds 9% in a bank and Fund B holds 8%, they share 8 percentage points of exposure to it; the extra 1% is unique to Fund A.

Overlap is not the same as the number of common stocks. Two funds can share 30 names but at tiny weights (low overlap), or share just 10 names at heavy weights (high overlap). Weight is what moves your returns.

Worked example: two large-cap funds (illustrative)

The holdings below are illustrative, not taken from any real scheme.

Suppose the remaining common holdings, scored the same way, add another 32 percentage points. Total overlap = 28% + 32% = 60%.

Now look at it in rupees. You invest ₹1,00,000 in each fund, ₹2,00,000 in all.

• Exposure to bank P: (9% × ₹1,00,000) + (8% × ₹1,00,000) = ₹9,000 + ₹8,000 = ₹17,000, or 8.5% of your ₹2,00,000.
• Exposure to the five stocks combined: Fund A's 31% plus Fund B's 30% = ₹31,000 + ₹30,000 = ₹61,000, or 30.5% of your money.

So almost a third of your two-fund "diversified" portfolio rides on five companies. A single fund would have given you nearly the same exposure at one expense ratio and one statement line. You can see how much any single lumpsum grows under different return assumptions with the lumpsum calculator, but overlap is about what you own, not how much it earns.

How much overlap is too much?

SEBI does not prescribe a "safe" overlap for investors. These are working rules of thumb, not regulations:

Some overlap is unavoidable. A large-cap fund, a flexi-cap fund and a large & mid-cap fund will all hold India's biggest banks and IT companies, because those stocks dominate the top 100. The question is whether each fund still brings something the others do not, such as mid-cap exposure, a different investment style or international stocks.

Where overlap typically hides

• Large-cap + flexi-cap + focused fund. Flexi-cap and focused funds often lean heavily on large caps, so all three may share the same top 10 stocks.
• Two index funds tracking the same index. A Nifty 50 index fund from one AMC and a Nifty 50 ETF from another overlap almost 100%. See what is an ETF for how the two wrappers differ.
• Nifty 50 index fund + large-cap active fund. SEBI's categorisation, as of October 2026, requires large-cap funds to keep at least 80% in the top 100 companies, so overlap with a Nifty 50 fund is usually high. Our comparison of index funds vs active funds covers whether paying for the active version makes sense.
• Sectoral or thematic funds on top of diversified funds. A banking fund plus a large-cap fund doubles your bank exposure, because banks are already the largest sector in most large-cap portfolios.
• ELSS plus a flexi-cap fund. Many ELSS schemes are managed in a flexi-cap style, so they can look very similar.

For a deeper look at how fund categories differ, read large-cap vs mid-cap vs small-cap funds.

SEBI's 2026 overlap rules for fund houses

SEBI's circular on categorisation and rationalisation of mutual fund schemes, dated 26 February 2026 and later folded into the Master Circular for Mutual Funds of 20 March 2026, introduced formal overlap limits for the first time. As of October 2026:

Two limits of these rules matter for you. First, they apply within one fund house, not across AMCs, so a large-cap fund from one AMC and a flexi-cap fund from another can still overlap heavily. Second, they target product design, not your personal portfolio. The monthly overlap disclosures are useful, but you still need to check the combination you actually hold.

How to check overlap yourself

1. Get the portfolios. Download each scheme's latest monthly portfolio (usually an Excel file) from the AMC website, or open the factsheet.
2. Match the stocks. Use ISIN codes rather than names, because names can be abbreviated differently.
3. Score each common stock with the lower weight and add them up.
4. Repeat for each pair of equity funds you own. With four funds, that is six pairs.
5. Look at total exposure too. Add up your rupee exposure to your top 10 stocks across all funds. If those 10 companies are more than 40% to 50% of your equity money, you are concentrated whatever the fund count says.

Online overlap tools from platforms and research sites do steps 2 to 4 automatically. They are convenient, but check the portfolio date they use, since monthly portfolios lag by a few weeks.

How to fix high overlap without paying avoidable tax

Selling a fund is a redemption, and redemptions can trigger tax and exit loads. A cheaper sequence:

1. Stop the SIP in the duplicate fund and redirect that amount to the fund you are keeping or to a fund that fills a real gap. This costs nothing.
2. Check exit loads. Many equity funds charge around 1% if units are redeemed within a year of purchase. With SIPs, each instalment has its own clock.
3. Use the long-term capital gains exemption. As of October 2026, equity fund gains held more than 12 months are taxed at 12.5% above ₹1.25 lakh a year (Section 198 of the Income-tax Act, 2025, old Section 112A). Gains within 12 months are taxed at 20% (Section 196, old 111A). Spreading exits over two financial years can let you use the exemption twice. Full details are in capital gains tax on mutual funds.
4. Exit in tranches. Sell units that are already past 12 months and past the exit-load period first.

Illustrative tax comparison

Say the duplicate fund holds ₹4,00,000, with ₹1,60,000 of long-term gains, and you have no other equity gains.

• Sell everything in one financial year: taxable gain = ₹1,60,000 − ₹1,25,000 = ₹35,000. Tax at 12.5% = ₹4,375, plus 4% cess of ₹175 = ₹4,550.
• Sell half in March and half in April: each year has ₹80,000 of gains, inside the ₹1,25,000 exemption. Tax = ₹0.

This is illustrative and assumes prices do not move between the two sales.

How many funds is enough?

For most individual investors, three to five equity funds cover the bases: for example, one large-cap or index fund, one flexi-cap fund and one mid- or small-cap fund, plus debt or hybrid funds for stability. Beyond that, each extra fund tends to raise overlap rather than diversification. This is a general guide, not personalised advice; your number depends on your goals and the categories you actually need.

Key takeaways

• Overlap = the sum of the lower weights of stocks two funds both hold. Above about 50%, the second fund adds little.
• In the illustration, two large-cap funds with 60% overlap left 30.5% of the money in just five stocks.
• As of October 2026, SEBI caps overlap only within a fund house (sectoral/thematic at 50% versus other equity schemes, value vs contra at 50%) and requires monthly overlap disclosure.
• Check overlap with each scheme's monthly portfolio, matching stocks by ISIN.
• Fix duplicates by stopping SIPs first, then exiting in tranches that respect exit loads and the ₹1.25 lakh yearly LTCG exemption.