The invisible cost: how 1.5% a year eats a third of your retirement

Why does a small fee cost so much?

An annual fee is not a one-off payment. It is a percentage charged on the balance, every year, for as long as the money stays invested. And the balance of a long-term savings plan is small at the start and large at the end.

That has a consequence the percentage hides. In year one, 1.5% of a 3,600 € balance is 54 €. In year thirty, 1.5% of a balance above 200,000 € is more than 3,000 €. The fee did not grow because the price went up. It grew because the base it is applied to grew, and it grew precisely because of the compound interest that makes saving work.

It is the same mechanism running in both directions. Compounding works for the investor and, on the very same balance, it works for whoever collects the fee.

What does 1.5% a year cost in euros?

This series' reference plan: 300 € a month, for 30 years, at 6% gross a year, before any cost. That is 108,000 € of contributions.

Every figure in this table is computed by our own compound interest calculator, in cost mode, on the assumptions stated above.

The cost-free plan would reach 301,354.51 €, of which 193,354.51 € would be gain. With 1.5% in annual charges, the investor ends with 227,815.84 €. The difference, 73,538.67 €, is what the fees took. And the gap between the 1.5% version and the 0.20% version is 62,264.28 €: the same money, the same horizon, the same market risk, two different prices.

A third of what? The denominator matters

It is worth being precise here, because this is the sentence most often misquoted.

The 73,538.67 € is:

• 38.03% of the gain the plan would have made with no costs;
• 24.40% of the final value the plan would have had with no costs.

Both statements describe the same euro of fees and produce different numbers because they divide by different things. "Fees eat a third" is true of the gain and false of the final value.

The honest denominator, in our view, is the gain. Fees do not come out of the contributions, which are the investor's own money and would exist anyway. They come out of the return the capital produced. Comparing the fee to the gain compares the cost to the thing the cost actually reduces. But we publish both numbers, and the calculator shows both with explicit labels, so the page cannot be read either way by accident.

The fees actually charged in Portugal

The 1.5% used above is not an example invented to dramatise the arithmetic. It is the top of the range we found among the Portuguese PPR plans we compared, with every figure taken from each product's own documentation:

Between the cheapest and the most expensive in this sample there are 44 hundredths of a percentage point. On the reference plan, that distance is worth more than 19,000 €.

A PPR has a genuine tax advantage in its favour, which can offset a higher fee, particularly for savers who claim the deduction every year. The point is not that a PPR is expensive. It is that two PPR plans carrying the same tax advantage can have very different costs, and that difference is chosen by the saver.

The advertised fee is not the total cost

There are three reasons the number on the front page of a brochure usually sits below the real cost.

The depositary fee is added. IMGA Poupança PPR/OICVM publishes 1% for management and 0.06% for the depositary. That is 1.06% a year, and 1.06% is what belongs in the calculator.

Some charges are not commissions. Audit and supervision fees are also paid by the fund. In the key information document, the figure that bundles all of them is called ongoing charges. That one, not the management fee in isolation, is the cost that reduces your return.

Published returns are usually already net. Optimize states explicitly that its published returns are already net of the management fee. That is correct and it is what regulation requires, but it has a side effect: the investor never sees the fee as an expense. They see only a lower return, without knowing by how much. This is what makes the cost invisible, and it is the reason this article exists.

Small savers have a different problem

So far this has all been about percentages. For anyone contributing small amounts, the biggest cost is often not a percentage at all. It is a flat fee.

Take a plan of 50 € a month, 30 years, 6% gross, in a cheap fund at 0.20%, through an account charging 2 € per order. At one purchase a month, that is 24 € a year in order commissions. After 30 years:

The per-order commission costs more than the fund does. The percentage that dominates every conversation about costs is, at this scale, the smaller of the two.

And it has a concrete fix. The DEGIRO fee schedule charges 1 € commission plus 1 € handling on a Euronext Lisbon share, but 0 € commission plus 1 € handling on the ETFs in its Popular ETF Selection. Going from 2 € to 1 € per order, on the same plan, is worth 966.93 €. Among the brokers we compared there are also accounts with no per-order commission at all, where this line disappears entirely.

Two practical rules follow. For small contributions, compare the price per purchase, in euros. And buying less often, with more money each time, reduces flat fees even if nothing else about the plan changes.

What to do with this

1. Find your number. Open your product's key information document and look for ongoing charges. If all you find is the management fee, add the depositary fee.
2. Convert it into euros. Put that figure, your contributions and your horizon into the compound interest calculator, in cost mode. The percentage tells you nothing; the total in euros tells you everything.
3. Find where the cost sits before moving anything. If it is in the annual percentage, the product is what has to change. If it is in the per-order price, the account or the purchase frequency is what has to change.
4. Do not trade risk for cost without noticing. A cheaper fund that invests in something else is not the same thing more cheaply. What this article compares is different costs over the same exposure.

The fee is the one variable in this equation the investor controls completely. You do not know what return you will get, what inflation will do, or when the market will fall. You do know, to two decimal places and before you start, what you will pay per year. It is the predictable side of a problem full of uncertainty, and that is why it is worth starting there.

This is the third piece in the Invest with Your Head series. The first showed what leaving your money idle costs; the next asks whether the funds charging these fees can at least beat the market.