Definition
Tracking Error
Tracking error is the standard deviation of the difference between an index fund or ETF's returns and its benchmark index's returns, measuring how consistently the fund follows the index.
For Indian passive funds, tracking error reflects how tightly an ETF or index fund hugs the Nifty or Sensex over time. It is driven by the expense ratio, cash drag, index rebalancing trading costs, securities-lending income and replication method. Lower tracking error means more faithful index replication.
Tracking error is distinct from tracking difference: error measures the volatility of the return gap, while difference measures the cumulative gap itself. SEBI requires AMCs to disclose tracking error for passive schemes, and investors comparing similar index funds often treat low, stable tracking error as a mark of quality.
Related terms
- Expense RatioThe expense ratio is the annual fee a mutual fund or ETF charges as a percentage of assets, covering management and operating costs, which directly reduces investor returns.
- Tracking DifferenceTracking difference is the actual cumulative return gap between an index fund or ETF and its benchmark over a period, typically negative because of fees and costs.
- Cash DragCash drag is the small performance shortfall an index fund or ETF suffers from holding uninvested cash, which earns less than the index when markets rise and contributes to tracking error.
- Index FundAn index fund is a passively managed mutual fund that aims to replicate the performance of a market index by holding the same securities in the same proportions, at low cost.
Plain-English explainer from The Dispatch Investors Encyclopedia. General information, not financial advice.