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The fee you don't see: understanding TER

Published Apr 28, 2026 · 5 min read

A fund's annual fee is usually the smallest number on its factsheet, and often the one that matters most over a long horizon. Here's how to actually use it.

What the TER actually covers

The Total Expense Ratio (TER) is the yearly cost of running the fund, expressed as a percentage of the amount invested, and deducted automatically from the fund's performance — you never see a separate invoice. A TER of 0.20% means €20 per year on a €10,000 position, taken gradually rather than billed once.

Why a 0.5% difference is bigger than it looks

Compounding applies to fees the same way it applies to returns — except in reverse. On a €10,000 investment growing at 7% annually over 25 years, a fund charging 0.10% ends up worth several thousand euros more than an otherwise identical fund charging 0.60%, purely from the fee difference compounding year after year. The gap widens the longer the money stays invested.

On Pioneer Invest: the TER is shown next to every ETF in the catalog, not buried three clicks into a PDF factsheet — because a number you have to go looking for is a number most people never check.

What a low TER does not tell you

Cost is one variable, not the only one. A very low TER attached to a niche or illiquid index can still be a poor choice if the index itself is volatile, poorly diversified, or expensive to trade. The TER is best used to compare funds that already track a similar strategy — not as a standalone reason to pick one fund over a fundamentally different one.

Fees don't need to be the main criterion for choosing a fund, but they should never be the criterion you forgot to check.