Two identical portfolios, one variable: the fee
30-year divergence - the fee wedge
The wedge between the lines is pure fees plus the growth those fees would have earned - $121,482 by year 30.
Your fee audit plan
The fee drag verdict
Same $10,000 start, same $500/month, same 7.0% market return, 30 years. The only difference is the expense ratio:
• At 0.05% fees: $683,965.
• At 1.00% fees: $562,483.
A 0.95% fee difference costs you $121,482 - 17.8% of your ending wealth
The fee itself looks tiny, but it's charged on the whole balance every year, so it compounds against you exactly the way returns compound for you.
What to do about it
• Check the expense ratio of every fund you own - it's on the fund's fact sheet. Broad index funds commonly charge 0.03–0.10%; actively managed funds often charge 0.5–1.5% for statistically similar or worse returns.
• Watch for stacked fees: an advisor charging 1% who puts you in 0.8% funds costs you both layers.
• Switching future contributions to a low-fee equivalent is usually simple; moving existing balances may have tax consequences in taxable accounts - check before selling.
How the fee drag calculator works
The calculator grows two identical portfolios - same starting balance, same monthly contribution, same market return - and subtracts a different expense ratio from each. Because the fee is charged on the entire balance every year, it compounds against you exactly the way returns compound for you. The gap between the two curves is your fee drag: the fees themselves plus all the growth those fees would have earned.
The results surprise almost everyone. A 1% fee sounds trivially small, but over 30 years it routinely consumes 20-25% of your ending wealth. This is why expense ratios are the single most reliable predictor of fund performance: the market's return is uncertain, but the fee's subtraction is guaranteed. Broad index funds commonly charge 0.03-0.10%; actively managed funds often charge 0.5-1.5% for statistically similar or worse results.
The drag compounds fastest in the final decade, not the first - a fee taken from a $500,000 balance costs far more in absolute dollars than the same percentage taken from a $50,000 balance, even though the percentage never changed. That's the part flat comparisons of expense ratios tend to miss: the true cost of a fee is proportional to how large your balance eventually grows, which is exactly when switching to a cheaper fund is hardest to justify psychologically and most valuable mathematically.
Frequently asked questions
- Where do I find my fund's expense ratio?
- On the fund's fact sheet or your brokerage's fund page, listed as 'expense ratio' or 'ongoing charges'. Check every fund you own - many people discover they hold one cheap index fund and several expensive legacy funds.
- Is a 1% advisor fee on top of fund fees?
- Usually yes - an advisor charging 1% who places you in 0.8% funds costs you both layers, roughly 1.8% total drag. Run that number in the calculator to see the 30-year cost before deciding what the advice is worth.
- Should I sell my expensive funds immediately?
- Redirect new contributions to a low-fee equivalent first - that's always safe. Selling existing holdings in taxable accounts can trigger capital gains tax, so weigh the fee savings against the tax cost, or make the switch inside tax-advantaged accounts where selling is free.
- Do low fees mean lower returns?
- The evidence says the opposite: across fund categories, lower-cost funds have historically outperformed higher-cost peers on average, simply because the fee subtraction is certain while manager outperformance is rare and inconsistent.
- Does this fee drag apply inside a 401(k) too?
- Yes, and it's worth checking closely - employer 401(k) plans sometimes only offer higher-cost fund options than you'd choose on the open market. If your plan offers an index fund alternative at a lower expense ratio, switching costs nothing and the 30-year drag comparison here shows exactly what staying in the pricier option would cost.