What is Tracking Error? A Simple Guide for Investors
Tracking error measures how closely an index fund or ETF follows its benchmark index. A low tracking error means the fund mirrors the index tightly; a high one means it drifts. For passive funds, a low tracking error is desirable.
An index fund promises to copy an index, but it never does so perfectly. Tracking error measures how faithful that copy is.
Read on for a simple breakdown built for beginners. You can explore index funds on Stockk.
Key Takeaways
- Tracking error measures how closely a fund follows its index.
- Low tracking error means a tight match.
- High tracking error means the fund drifts.
- It matters most for index funds and ETFs.
- Lower is better for passive investing.
What causes tracking error?
An index fund aims to replicate its index exactly, but small differences arise from costs, cash holdings, and the timing of trades. These cause the fund's returns to deviate slightly from the index. Tracking error measures the size of this deviation over time.
Imagine an index fund returns 9.7% while its index returns 10%. That 0.3% gap reflects its tracking error, caused by costs and practical frictions. A well-run index fund keeps this gap small.
How to read tracking error
| Tracking error | Meaning |
|---|---|
| Low | Fund closely mirrors the index |
| High | Fund drifts from the index |
| For passive funds | Lower is better |
What affects tracking error?
- Expense ratio: higher costs widen the gap
- Cash drag: idle cash not invested in the index
- Trade timing: delays in matching index changes
- Replication method: full versus sampled holdings
Why tracking error matters
For passive investors, the whole point is to match the index cheaply, so a low tracking error signals the fund is doing its job well. When comparing index funds on the same benchmark, a lower tracking error and lower cost together make a fund more attractive. For active funds, tracking error is less relevant, since they aim to differ from the index.
If you want to act on fund performance, Stockk lets you invest in mutual funds in one place. Set up a free account to begin, and browse the Knowledge Center to keep learning.
Mutual fund investments are subject to market risks. Read all scheme related documents carefully. Past performance is not a guarantee of future returns, and this article is for learning only, not investment advice.
Frequently Asked Questions
What does a low tracking error mean?
It means the fund closely mirrors its benchmark index, which is desirable for index funds and ETFs whose goal is to match the index.
What causes tracking error?
Costs, idle cash, trade-timing delays and the replication method cause a fund's returns to deviate slightly from its index over time.
Why does tracking error matter for index funds?
Because their goal is to match the index cheaply, a low tracking error shows they are doing that well, making them more attractive.
Does a high expense ratio increase tracking error?
Yes, higher costs widen the gap between the fund and its index, so lower-cost index funds tend to have lower tracking error.
Is tracking error relevant for active funds?
Less so, since active funds aim to differ from the index. It matters mainly for passive funds.
Investments in securities market are subject to market risks. This article is for educational purposes only and does not constitute investment advice.
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