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Beyond expense ratio — the quieter costs that chip away at your returns.
Expense ratio gets all the attention because it's the one number printed clearly on every factsheet. But it's not the only cost working against your returns. Several other charges are baked into a fund's day-to-day performance without ever showing up as a separate line item — you only notice their effect when you compare a fund's actual returns to what its holdings should have delivered. This lesson covers the ones worth knowing about.
Every time a fund buys or sells shares, and every time you redeem equity fund units, a small transaction tax called STT is deducted automatically. It's a tiny percentage of the transaction value, but a fund manager who trades frequently — buying and selling holdings often — racks up more STT than one who holds positions for years. This cost is absorbed into the fund's NAV; you never see a separate STT bill, but it quietly reduces returns for actively-traded funds more than for buy-and-hold ones.
GST is charged on the fund's expense ratio itself, at 18%. This isn't billed to you separately — it's factored into the total expense ratio figure shown on the factsheet. So when you see an expense ratio of 1%, part of that 1% is actually GST on the management fee, not the fee alone. It's a cost within a cost, which is exactly why it's easy to miss.
Turnover ratio measures how much of a fund's portfolio gets bought and sold within a year. A fund with 100% turnover has effectively replaced its entire portfolio once during the year; a fund with 20% turnover holds most positions for years at a time.
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Every trade a fund makes involves brokerage, STT, and the bid-ask spread — the small gap between the price a stock can be bought at versus sold at. High-turnover funds pay these costs repeatedly through the year, which chips away at returns even before the expense ratio is applied. This is one reason two funds with identical expense ratios can still deliver noticeably different net returns.
Funds keep a small portion of their assets in cash to handle daily redemptions without having to sell holdings at short notice. That cash isn't invested in the market, so when markets rise, this uninvested portion earns little to nothing while the rest of the portfolio gains — a drag on overall returns known as cash drag. It's usually small in well-managed funds, but funds with unusually high cash levels can meaningfully underperform their own benchmark purely because a chunk of the money isn't working.
An index fund is meant to mirror its benchmark exactly, but in practice it rarely does so perfectly. Tracking error measures how much a fund's returns deviate from its index — caused by cash drag, expense ratio, transaction costs during rebalancing, and timing differences. A lower tracking error means the fund is doing its one job — replicating the index — more efficiently. When comparing two index funds tracking the same benchmark, tracking error is often more useful than expense ratio alone.
Some investment platforms or advisors charge their own fee on top of the fund's expense ratio — either a flat annual charge or a percentage of assets under their advice. This is separate from the Direct-vs-Regular commission structure covered earlier, and it's worth explicitly checking whether the app or advisor you use charges anything beyond what's already built into the fund itself.
1. Comparing only the expense ratio between two funds
A fund with a lower expense ratio but very high portfolio turnover can still underperform one with a slightly higher expense ratio but a steadier, low-churn strategy.
2. Ignoring tracking error when picking an index fund
Two index funds tracking the same benchmark can still deliver different real-world returns purely based on how tightly they track it.
3. Not checking for platform or advisory fees separately
Some apps and advisors add their own charge on top of the fund's own costs — this can go unnoticed if you only ever look at the fund's factsheet.
Key Takeaway
Expense ratio is only part of the cost picture. STT, GST on the expense ratio, portfolio turnover, cash drag, and tracking error (for index funds) all quietly work against your returns without showing up as a separate charge anywhere. And some platforms or advisors layer their own fees on top of what the fund already charges. Looking beyond the headline expense ratio number, especially portfolio turnover and tracking error, gives a more complete picture of what a fund is really costing you.