Index Fund Lag: Is Your SIP Losing 1.5% Silently?
Index funds are supposed to copy a market benchmark exactly. But they never do perfectly. This gap — called tracking error — can quietly eat into your SIP returns over time. Here's what to watch for.
A 1% annual tracking error on ₹5L SIP over 20 years = ₹3L+ quietly vanished — that's 600 cups of chai every year, gone.
Even your 'safe' index fund could silently lag its benchmark by this much
Key Takeaways
Check your index fund's tracking error on its factsheet or AMC website — look for a number below 0.50% for large-cap funds.
Compare the fund's 1-year return against its benchmark index return on AMFI's website to calculate the actual tracking difference yourself.
Switch to a lower-cost index fund (expense ratio under 0.10%) if your current fund consistently underperforms its benchmark by more than 1% annually.
Index funds are supposed to copy a market benchmark exactly. But they never do perfectly. This gap — called tracking error — can quietly eat into your SIP returns over time. Here's what to watch for.
Here's what happened: Passive mutual funds like Nifty 50 or Sensex index funds aim to mirror benchmark returns, but always fall slightly short due to costs and cash drag.. Tracking error measures how much a fund's daily returns deviate from its benchmark — a lower number (under 0.5%) means better replication quality.. Tracking difference (total annual return gap vs benchmark) and tracking error (daily volatility of that gap) are two separate metrics investors often confuse..
What you should do: Check your index fund's tracking error on its factsheet or AMC website — look for a number below 0.50% for large-cap funds.. Compare the fund's 1-year return against its benchmark index return on AMFI's website to calculate the actual tracking difference yourself.. Switch to a lower-cost index fund (expense ratio under 0.10%) if your current fund consistently underperforms its benchmark by more than 1% annually..
Tracking difference is actually more useful than tracking error for long-term investors — it tells you the real rupee gap in annual returns, not just daily volatility.
For readers weighing their credit and loan options, our personal loan guide and CIBIL score resources put this update in context.
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This article is reported by GoCredit's Editorial Team based on the source above. GoCredit synthesises, contextualises, and adds India-borrower-relevant analysis. We are not the original publisher.