A fee removes future compounding as well
A fund-fee impact is the gap between two compounded balances, not simply fee percentage multiplied by the starting balance. A fee reduces the base available to grow in every later year, so its opportunity cost grows with time. The comparison deliberately holds the gross return constant to isolate the drag from the stated annual fee.
Two annual return paths
No-fee balance = starting balance × (1 + gross return ÷ 100)^years. Fee-adjusted balance uses gross return minus fee instead. The displayed cost is the no-fee balance minus the fee-adjusted balance. This models a fee deducted smoothly enough to approximate one annual net-return reduction.
The twenty-year difference from one percentage point
At 7%, $100,000 compounds by 1.07 twenty times to about $386,968. Subtracting a 1% fee leaves a 6% net modeled return and about $320,714 after twenty years. The $66,254 gap is larger than twenty 1% charges on the original $100,000 because each charge also loses future growth.
Reading an expense ratio over time
Use it when reading an expense ratio, comparing broadly similar funds, or deciding whether a service fee earns its cost. Run the same fee over ten and thirty years to see how holding period changes the trade-off.
Investment features the comparison holds still
Taxes, trading costs, adviser fees charged separately, deposits, withdrawals, benchmark tracking, risk, manager performance, fee waivers, and different fee-calculation schedules are not included. A lower fee does not guarantee a higher future return.
Percentage and net-return errors
Enter 1 for a 1% annual fee, not 0.01. Do not subtract the fee from the starting balance only once. Compare fees charged on the same assets and check whether an advertised return is already net of fees before subtracting again.
A counterfactual fee gap, not an investment forecast
This page isolates the compounding drag of a fund fee. A general investment-return calculator can include deposits and an ending market value, but it does not show a side-by-side no-fee counterfactual.
Read a fee as a lost-growth path
The default comparison ends with $386,968.45 at 7% and $320,713.55 at a modeled 6%, a $66,254.90 counterfactual gap. It is not an invoice; it is the future-value difference created because a continuing fee leaves less invested to compound. At the same gross assumption, a 0.25% fee produces roughly $369,300 after twenty years, showing why a small percentage difference can require substantial extra gross return to overcome. The approximation subtracts a yearly fee from a yearly return, whereas a real fund may accrue expenses daily, waive fees temporarily, charge a fixed account fee, or have transaction and advisory charges outside its expense ratio. Read the prospectus fee table and identify the share class and date before comparing. The SEC explains that ongoing expenses reduce portfolio assets available to earn returns. Market risk, tax, deposits, withdrawals, and benchmark differences remain outside this educational comparison, so it cannot recommend a fund or predict an ending balance.
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