Nippon India Nifty BeES has a 0.04% expense ratio. UTI Nifty 50 Index Fund charges 0.20%. On paper, the ETF is 5x cheaper. But over the last 5 years, UTI Nifty 50 Index Fund has delivered returns closer to the actual Nifty 50 index than most ETFs available to retail investors. How?

The answer is in the difference between expense ratio and tracking difference - and it changes the entire ETF vs index fund calculation.

Expense Ratio vs Tracking Difference

Expense ratio is what the fund house charges you annually. Tracking difference is the actual gap between the fund’s return and the index return over a full year.

A fund can have a low expense ratio but high tracking difference if it: holds excess cash, has poor index replication, earns low securities lending income, or incurs high brokerage costs on rebalancing.

Fund Expense Ratio 1-Year Tracking Difference (2023)
Nippon Nifty BeES (ETF) 0.04% 0.08%
HDFC Nifty 50 ETF 0.05% 0.07%
UTI Nifty 50 Index Fund 0.20% 0.03%
HDFC Index Fund Nifty 50 0.20% 0.05%
SBI Nifty 50 Index Fund 0.20% 0.12%

UTI Nifty 50 Index Fund, despite its higher expense ratio, tracks the index more accurately than some ETFs in actual daily NAV calculations. It earns back much of that 0.20% through securities lending income.

The Liquidity Problem With ETFs

ETFs trade on exchanges like stocks. That sounds like an advantage - and it is if you are a large institutional investor. For retail SIP investors, it creates three friction points:

The Bid-Ask Spread

When you buy an ETF, you pay the ask price. When you sell, you receive the bid price. For liquid ETFs like Nifty BeES, this spread is typically 0.02-0.05%. For less liquid ETFs, it can be 0.1-0.3%.

A 0.1% spread on every buy and sell is an additional 0.2% round-trip cost. Over 20 years of monthly SIPs (240 transactions), that adds up.

ETFs can trade at a premium or discount to their actual NAV. In volatile markets - March 2020 being the prime example - Indian ETFs traded at discounts of 0.5-1.5% to their NAV. If you sold during the COVID crash, you received less than the NAV of the underlying stocks.

Index funds always transact at end-of-day NAV. No discount. No premium. What you see is what you get.

The SIP Friction Problem

Setting up a monthly SIP in an ETF requires:

  • A demat account
  • A brokerage account
  • Manual orders or a broker platform with SIP automation
  • Worrying about partial units (Rs. 10,000 / Rs. 230 = 43.47 units - most platforms handle this now, but errors occur)

Index funds: visit AMC website, set up SIP via bank mandate. Done.

When ETFs Win

ETFs are genuinely better in specific scenarios:

Large Lump Sum Deployments

If you are deploying Rs. 10 lakh or more at once, the intraday trading ability of ETFs is valuable. You can buy at a specific price point rather than waiting for end-of-day NAV. For tactical allocation changes, ETFs allow precision.

Demat-First Investors

If your primary investing interface is Zerodha or a similar broker, and you already have a demat account, an ETF is one fewer account to manage. Platforms like Kite now support ETF SIPs with fractional unit handling.

International and Niche Indices

For international ETFs (Nasdaq 100, S&P 500), there are no equivalent index funds in India as of 2024 - SEBI has restricted inflows to international funds. In this space, ETFs are the only option.

Total Cost of Ownership Comparison

For a Rs. 10,000/month SIP over 20 years with 12% index returns:

Vehicle Expense Ratio Estimated Tracking Diff Bid-Ask Impact Effective Annual Cost
Nifty BeES ETF (via broker) 0.04% 0.07% 0.05% ~0.16%
UTI Nifty 50 Index Fund (direct) 0.20% 0.03% 0% ~0.23%
SBI Nifty 50 Index Fund (direct) 0.20% 0.12% 0% ~0.32%

The ETF wins on total cost of ownership when you factor in tracking difference and exclude the bid-ask spread. But the margin is thin - about 0.07% per year over index funds from good AMCs.

On a 20-year corpus of Rs. 1 crore, 0.07% is Rs. 70,000 - real money, but not life-changing given the convenience trade-off.

Tax Treatment: No Difference

Both ETFs and index funds tracking Indian equity indices are treated as equity mutual funds for tax purposes:

  • STCG (held less than 1 year): 20%
  • LTCG (held more than 1 year): 12.5% above Rs. 1.25 lakh

No difference. International ETFs/funds have a separate debt fund tax treatment.

The Practical Recommendation

For most retail investors doing monthly SIPs:

Go with a direct plan index fund from UTI or HDFC. The 0.07% annual cost advantage of ETFs does not justify the additional complexity, bid-ask spread risk, and NAV discount exposure.

For investors deploying large lump sums or doing tactical allocation: Nifty BeES or HDFC Nifty ETF are fine choices with genuine advantages.

Bottom Line

ETFs and index funds both deliver index returns minus costs. For SIP investors, the index fund wins on simplicity with minimal cost disadvantage - UTI Nifty 50 Direct Plan is one of the tightest tracking funds in India and costs effectively what a liquid ETF with spread costs you anyway. Save the ETF route for large lump sums or niche indices where index funds do not exist.