When people talk about an investment fund's fee, they often only mention the management fee, but there are other fees and expenses that also reduce your final return, and that aren't always communicated with the same clarity.
The management fee: the best known one
This is the fee the fund manager charges for administering the fund, expressed as an annual percentage of the assets under management, and it's usually the figure most highlighted in the product's marketing materials.
The custody fee
This is the fee charged by the entity that holds custody of the fund's assets (different from the fund manager), also expressed as an annual percentage, added on top of the management fee within the total cost borne by the fund.
The fund's own transaction expenses
Every time the fund manager buys or sells assets within the portfolio, transaction expenses are generated (trading fees, spreads) that aren't always included in the advertised management fee, and that depend on the portfolio's turnover (how much the manager buys and sells throughout the year).
Performance or success fees
Some funds, especially actively managed ones, include an additional fee on returns achieved above a certain reference index or threshold, added on top of the fixed management fee, which can substantially increase the total cost in years of good performance.
The indicator that brings (almost) everything together: the TER
The TER (Total Expense Ratio) is an indicator that gathers most of these recurring costs (management, custody, other operating expenses) into a single annual figure, making it easier to compare between different funds. It doesn't always include transaction expenses or performance fees, so it's still worth reviewing the fund's full prospectus.
Why this difference matters so much over the long term
A difference in total cost that seems small in the short term (for example, an extra 0.5% a year) has a considerable cumulative effect over several decades, precisely because of the same compound interest mechanism working in reverse: every percentage point in fees is return you fail to accumulate, year after year.
Where to find this information
Each fund's Key Investor Information Document (KID, or DFI under the applicable Spanish regulation) includes the TER and other cost data in a standardized format, making it the most reliable reference document for comparing the real cost between different funds before investing.
Compare the effect of different cost scenarios
Our compound interest calculator lets you simulate the final result under different net return assumptions, useful for sizing up the real impact of fees on your long-term investment.