ETF Tracking Error Singapore
Category: ETF / FUNDS | The Kopi Notes Singapore Investing Glossary | Updated Q1 2026
ETF tracking error quantifies how closely an ETF returns mirror its benchmark index, expressed as the annualised standard deviation of daily return differences. For Singapore-listed ETFs, tracking error arises from management fees, dividend withholding tax, sampling methods, and hedging costs. Lower tracking error indicates a more efficient ETF.
For informational purposes only. Not financial advice.
What Is ETF Tracking Error?
Tracking error = annualised standard deviation of daily return differences between ETF and benchmark index. A tracking error of 0.5% means returns deviate ~0.5% per year on average. Distinct from tracking difference (the cumulative underperformance gap over a period). Investors want both to be low and consistent.
Causes of Tracking Error in Singapore ETFs
- Management fees (TER) – most predictable source. A 0.3% fee causes ~0.3% annual underperformance.
- Dividend withholding tax – US equity ETFs listed in Singapore face 30% US dividend withholding vs 15% for Ireland-domiciled equivalents, creating tax drag.
- Full replication vs sampling – full replication (holds all index constituents) = lower tracking error; sampling = higher tracking error.
- Securities lending income – ETFs that lend securities earn fee income that may partially offset cost drag.
- Currency hedging – hedged share classes incur additional costs.
STI ETF Tracking Error
The two main STI ETFs on SGX – ES3 (SPDR STI ETF) and G3B (Nikko AM Singapore STI ETF) – use full replication of 30 STI constituents. Management fees ~0.20-0.30% p.a. Historical tracking errors typically below 0.3%/year. No withholding tax complications for Singapore domestic dividends.
Global ETF Tracking Error on SGX
Global ETFs listed on SGX (S&P 500, MSCI World) tend to have higher tracking errors due to dividend withholding tax (30% for Singapore-domiciled vs 15% for Ireland-domiciled), currency hedging costs, and time zone pricing gaps. Many Singapore investors prefer Ireland-domiciled ETFs (e.g. VWRA on LSE) for better dividend tax efficiency. See ETF vs Unit Trust.
How to Evaluate ETF Tracking in Singapore
Steps: (1) Compare annual ETF return vs index return over 1, 3, 5 years = tracking difference. (2) Calculate standard deviation of daily differences = tracking error. (3) Compare TER vs actual tracking difference – a large gap indicates hidden costs or tax drag. Resources: Morningstar, SGX ETF portal, Nikko AM and State Street factsheets. See Expense Ratio.
Frequently Asked Questions
What is ETF tracking error in simple terms?
How much an ETF returns deviate from the index it tracks, measured as annualised standard deviation of daily return differences. For Singapore STI ETFs, tracking error is typically below 0.3% per year.
What causes ETF tracking error to be high?
Main causes: management fees, dividend withholding tax differences, sampling vs full replication, currency hedging costs, and time zone pricing gaps. Global ETFs on SGX may have higher errors than locally-focused STI ETFs.
Is tracking difference or tracking error more important?
Both matter. Tracking difference tells you the cumulative shortfall (e.g. 0.35% less than index per year). Tracking error tells you how consistent that shortfall is. A consistent small shortfall is more predictable than a volatile large deviation.
How can I check the tracking error of a Singapore ETF?
Check the ETF issuer factsheet (Nikko AM, SPDR, Lion Global websites), Morningstar ETF pages, or SGX ETF data portal. Factsheets show annualised tracking difference. True tracking error requires daily NAV vs index data from ETF annual reports.
Do STI ETFs have low tracking error?
Yes – both ES3 and G3B use full replication of the 30-constituent STI with management fees of 0.20-0.30% p.a. Tracking errors are typically below 0.3% per year. No withholding tax complications for Singapore domestic dividends.