Direct vs. Regular Plan in Nifty 50 Index Mutual Funds: How Expense Ratio Impacts Long-Term Returns

Two colleagues start a ₹10,000 monthly SIP in the same Nifty 50 index fund in the same week. One invests through a mutual fund distributor, the other directly through the fund house’s app. Both own the same 50 companies in the same proportions, yet twenty or thirty years later their statements will not match. With Nifty 50 index mutual funds, the reason is almost always the plan each of them picked and the expense ratio that came with it.

It sounds like a small detail. Over a long holding period, it is one of the few things in an index fund that you actually control.

How Direct and Regular Nifty Plans Differ

Ask for the factsheet of almost any of the Nifty 50 index mutual funds, and you will find two expense ratios, one marked “Direct” and one marked “Regular.” The portfolio behind both lines is identical. What differs is that the regular plan carries a distributor’s commission inside its yearly charge, while the direct plan, bought straight from the fund house, leaves it out. The split has existed since 1 January 2013, when SEBI made fund houses run a separate direct plan with its own NAV.

In mid-2026 factsheets, direct plans of Nifty 50 index funds typically charged between about 0.1% and 0.3% a year, and regular plans between about 0.45% and 0.7%. Older funds make the effect easier to see. In at least one long-running Nifty 50 index fund, where both plans have existed since 2013, the direct plan’s NAV was about 16% higher than the regular plan’s by March 2026, even though both plans hold exactly the same shares.

Past performance is not indicative of future returns.

Why Costs Matter More When Everyone Owns the Same Index

An active fund manager can, in theory, make up for higher costs with better stock picks. Nifty 50 index mutual funds cannot. They all hold the same basket, so whatever a fund charges comes straight off the index return.

The effect is visible even over a single year. In the twelve months to 30 June 2026, the Nifty 50 TRI returned -5.42%. Index funds tracked it, falling slightly further, and typically more in their regular plans than in their direct plans, because the higher expense ratio was deducted on top of the market’s fall.

Consider the two colleagues’ SIPs. Assume, purely as an illustration, that the index earns a steady 10% a year before costs (no market does, and no return is guaranteed); the first colleague’s regular plan charges 0.50% and the second colleague’s direct plan of 0.15%. After ten years of ₹10,000 a month, the direct SIP would be worth about ₹19.99 lakh and the regular one ₹19.62 lakh. After thirty, about ₹2.02 crore against ₹1.89 crore, on the same ₹36 lakh invested.

After ten years, the difference is relatively small, about ₹37,000. By the year thirty it is more than ₹13 lakh, because each year’s extra charge also takes away the growth that money would have earned later. For Nifty 50 index mutual funds, where the portfolio cannot differ, that cost gap is close to the whole story.

Index figures reflect historical movements of the Nifty 50 TRI. SIP figures are a hypothetical illustration: ₹10,000 invested at the start of each month, returns compounded monthly at an equivalent rate, with the expense ratio deducted from an assumed 10% annual return. They do not represent any scheme’s performance. Past performance is not indicative of future returns, and returns are not guaranteed.

Understanding the Expense Ratio Under the 2026 Rules

If you have opened a factsheet since April 2026, you may have noticed a new line. Under the SEBI (Mutual Funds) Regulations, 2026, which replaced the 1996 rules on 1 April, the old single expense figure is now presented in components: a base expense ratio covering the fund house’s own charges, with brokerage and levies like GST and stamp duty added on at actual cost. The ceiling on that base figure for index funds is 0.90%, lower than the 1% all-in limit that applied before.

For comparing plans, put the total expense ratio of the direct plan next to that of the regular plan in the same scheme and treat the difference as the yearly price of the distribution service. When comparing across different Nifty 50 index mutual funds, look at the tracking difference too, because a cheap fund that follows the index loosely can still trail a slightly costlier one.

What Investors Receive for the Higher Expense Ratio

None of this makes regular plans wrong. The commission pays a distributor to open the account, handle the paperwork, and talk an investor out of stopping a SIP in the middle of a market fall. For an investor who would otherwise have redeemed during the March 2020 fall, that one conversation could be worth far more than 0.35% a year. The extra cost becomes a drag on returns only when the service goes unused, for instance when an investor picks funds alone but continues to hold the regular plan without reviewing it. Some longtime investors in Nifty 50 index mutual funds are there only because of how their first SIP form was filled.

Tax Implications of Switching from Regular to Direct

Moving from regular to direct in Nifty 50 index mutual funds is not a simple administrative change. The switch counts as a redemption followed by a fresh purchase, so capital gains tax applies, along with any exit load still running. Units held for 12 months or less are taxed at 20%. Older units fall under long-term capital gains, where the first ₹1.25 lakh each year is exempt, and the rest is taxed at 12.5%, plus surcharge and cess.

Suppose the regular plan units carry ₹3 lakh of long-term gains. Switching everything at once leaves ₹1.75 lakh taxable, which is ₹21,875 before surcharge and cess. Spreading the move over three years, around ₹1 lakh of gains at a time, can keep it inside the yearly exemption, provided no other long-term equity gains are using it up.

Tax treatment is based on current laws for FY 2026-27 and is subject to change.

Conclusion

In Nifty 50 index mutual funds, both plans hold the same stocks, follow the same index and carry the same market risk. The real difference is the yearly charge, and over twenty or thirty years that charge can show up as lakhs of rupees in the final number. If you value a distributor’s help and actually use it, the regular plan’s extra cost buys something. If you do not, the direct plan keeps that money compounding in your own account. Check the total expense ratio of both plans before deciding; a SEBI-registered investment adviser can help if you are unsure which route suits you.

Mutual fund investments are subject to market risks. Past performance is not indicative of future returns. Returns are not guaranteed. Please read all scheme-related documents carefully. Investors are advised to consult a SEBI-registered investment adviser before making any investment decisions.