Investment Fee Drag Calculator
A 1% annual fee sounds small, but because it is charged every year on a compounding balance, it can erase a large share of your final wealth. This calculator runs the same gross return twice — once with the fee and once without — so you can see the cumulative cost in money, not just basis points.
Balance with no fee
$691,150
Balance after fees
$562,483
Lost to fees
$128,667 · 18.6%
Share of potential balance lost to fees
Both paths use the same gross return; the fee path subtracts the annual fee from the return each month. Nominal figures; ignores taxes and inflation. A small percentage fee can cost a large share of the final balance over long horizons.
Why a small fee costs so much
Fees compound against you the same way returns compound for you. Each year the fee is taken from a larger balance, and every dollar removed also forfeits all the growth it would have produced in every future year. Over a multi-decade horizon, a 1% fee on a portfolio earning mid-single-digit real returns commonly consumes a double-digit percentage of the final balance. That is why low-cost index funds and clear fee comparison matter more than chasing a slightly higher headline return.
How to use it
Enter the same gross return you would expect before costs, then set the fee to a fund's expense ratio, an advisory fee, or the two combined. The result shows the balance with no fee, the balance after the fee, and the gap — both in money and as a share of the fee-free balance. Compare two funds by running it twice and noting the difference the fee alone makes.
Limitations
This isolates the fee's effect under a constant gross return; real returns vary year to year and fees can be charged on different bases. It ignores taxes, trading costs inside a fund, and inflation. Use it to compare the relative drag of different fee levels, not as a precise forecast of any specific fund.
FAQ
Is a 1% fee really a big deal?
Over short periods, no. Over decades, yes — because the fee is charged on a compounding balance every year, a 1% fee often costs a double-digit percentage of the final balance. Run a 30-year horizon to see the effect.
What should I enter for the fee?
Use the fund's expense ratio, or add an advisory fee on top if you pay one. To compare two funds, run the calculator twice with each fund's fee and the same gross return.
Does this include taxes?
No. It isolates the effect of the fee under a constant gross return and ignores taxes, in-fund trading costs, and inflation. It is a comparison aid, not a precise forecast.