Tool · Compounding
Fee-Drag Calculator
See the dollar cost of fees over a full career. Compare expense ratios, advisor AUM fees, and platform fees side-by-side — and watch what a 75-basis-point difference does across 30 years of compounding.
All calculations run locally in your browser. Your inputs are never transmitted or stored.
Shared Inputs
Pre-fee, real (after inflation). Historical US equity real return ≈ 7%.
Scenario A · Low-Cost
Scenario B · Higher-Fee
Scenario A Ending Value
Scenario B Ending Value
Cost of Higher Fees
At Year
Divergence Over Time
Every 5 years shown
| Year | Scenario A | Scenario B | Gap | Gap % |
|---|---|---|---|---|
In plain terms
Over years, paying instead of all-in costs you . That's of your total contributions — compounded away to the fund company or advisor.
How it works
The math behind the bars
The compounding model
Each scenario is simulated month-by-month for periods. At each step:
net monthly rate = (gross − expense_ratio − aum_fee) / 12
balance *= (1 + net monthly rate)
balance += (annual_contribution / 12)
Contributions are split across 12 monthly payments (a reasonable proxy for dollar-cost averaging into an IRA) and added at month-end. All returns are real — enter what you expect after inflation.
Why fees look so small and cost so much
A 1% fee on a 7% gross return isn't a 1% haircut — it's a 14.3% reduction in growth rate (1 / 7 = 14.3%). Compounded across 30 years, that haircut turns a $1 into $0.65 instead of $1.00. Every percentage point of fee compounds separately against the full balance, not against just the year's gain.
The Bogle rule of thumb: a 30-year horizon turns each 1% of annual fee into roughly 25% of your eventual balance. This calculator computes the exact figure for your inputs.
What "all-in fee" captures
The headline fee here is expense ratio + AUM fee. In practice, there are also: bid/ask spreads, transaction costs inside a fund, securities-lending revenue that may or may not be returned to shareholders, 12b-1 fees, wrap-account platform fees, and tax drag in taxable accounts. All are real, and all compound the same way — but none are in this calculator. For most Roth IRA investors in broad index funds, the expense ratio is the dominant cost.
Common fee benchmarks (2026)
| Low-cost S&P 500 index fund (VOO, FXAIX) | 0.03% |
| Low-cost total-market fund (VTI, FZROX) | 0.00% – 0.03% |
| Target-date fund (Vanguard) | 0.08% |
| Robo-advisor management fee (Betterment, Wealthfront) | 0.25% |
| Typical human advisor AUM | 1.00% |
| Actively managed equity fund (median) | 0.75% |
User Guide
How to use the Fee-Drag Calculator
This tool converts an expense ratio or advisory fee into a dollar figure showing exactly how much it will cost you over your investment horizon. Compounding does not treat fees kindly — a 1 % annual fee compounded over 30 years costs roughly 25–30 % of your terminal wealth, which for a meaningful Roth IRA balance can be six figures. The tool shows the number in dollars, not basis points, so that the trade-off becomes concrete.
Expense ratios are quoted as small percentages because small percentages sound cheap. They aren't. They apply every year to the full account balance, which means a tool that says "your 0.8 % fund is fine" is doing you a disservice if the alternative is a 0.04 % index fund that delivers essentially the same portfolio. Over a working lifetime the gap is the price of a down payment, a car, or a year of college. This tool puts the right number on that decision.
Who should use this tool
Roth IRA owners choosing between share classes, advisor-managed versus self-managed accounts, actively managed funds versus index funds, or 401(k) fund menus where costs vary. The tool is also useful for anyone considering a "robo-advisor" with a 0.25 % wrap fee on top of the underlying fund expense ratios — the combined drag is often 0.4–0.6 % all-in, before you count the additional trading-cost and rebalancing friction that don't show up in the headline expense ratio.
It's also the right tool for workers weighing whether to roll an old 401(k) into an IRA. Many large-employer 401(k) plans have access to institutional share classes below 0.05 %; some smaller plans have menus of funds averaging 1 % or more. If your old plan is expensive, rolling to an IRA where you can buy a four-basis-point total-market index usually saves meaningful dollars. Run both numbers.
Walking through the inputs
Current balance and annual contribution. The tool projects both forward to your horizon. If you contribute yearly, the compounding on each new contribution is shorter, so the fee drag on contribution year N is smaller than on the opening balance — but the sum across years still adds up quickly.
Two expense ratios to compare. The "baseline" (typically a high-cost fund or advisor) and the "alternative" (typically a low-cost index fund). You can also model three scenarios by running the tool twice.
Expected return. The gross return before fees. Use real (inflation-adjusted) returns throughout so the terminal dollars reflect purchasing power. A reasonable default is 5 % real for a 70/30 US equity/bond allocation.
Horizon in years. Time from now to terminal balance. For a 30-year-old the horizon to retirement is 35+ years; for a 55-year-old the horizon to first withdrawal is 10-15 years and the dollar gap will be smaller, but often still meaningful.
How to read the result
The output is terminal balance under each scenario plus the dollar gap between them. The tool also shows three derived metrics. Percent of terminal wealth lost to fees is the most intuitive framing: a 1 % fee over 30 years typically eats 25–30 % of the terminal pot, which is a number that changes behavior in a way "100 basis points" doesn't. Years of contributions burned translates the gap into "how many years of your $7,500 annual contributions were effectively handed to the fund complex?" This framing is brutal and clarifying. Per-year equivalent drag annualizes the terminal gap back into a yearly dollar figure, which is what you'd save per year by switching funds today.
The chart shows the two balance curves diverging over time. The gap widens non-linearly — the last five years of a 30-year horizon show most of the damage, because the lost compounding on earlier fee dollars is itself compounding.
Common mistakes this tool prevents
- Treating the expense ratio as a flat annual cost. It compounds. A 1 % fee is not a 30 % cost over 30 years — it's more, because each year's fee forfeits the growth on that dollar for every remaining year.
- Ignoring advisor fees that sit on top of fund expense ratios. A "0.85 % expense ratio" inside a 1 % advisor wrap is a 1.85 % all-in drag. Many investors see only one of the two numbers.
- Forgetting bid-ask spreads and fund-level transaction costs. For a broad index fund these are trivial (a few basis points). For a small-cap active fund with high turnover they can add another 50+ bps that never show up in the expense ratio but absolutely show up in your return.
- Comparing after-tax returns on funds held in a Roth. Inside a Roth, distributions and capital gains don't matter — only the expense ratio and pre-fee return. The tool correctly ignores tax drag inside a Roth wrapper. In a taxable account, use a different analysis that includes tax drag.
- Assuming active management's fee is "earned back" by outperformance. The empirical evidence on this is unambiguous — in aggregate, active funds underperform their benchmarks by roughly the amount of their fees. Assume zero before-fee alpha unless you have a specific, well-documented reason to believe otherwise.
- Overlooking the 12b-1 fee. Some older mutual-fund share classes charge an additional 0.25–1.00 % 12b-1 fee on top of the headline expense ratio to compensate brokers. The expense ratio on the fund sheet may or may not include this — read the prospectus.
After you see the gap
If the gap is material — any five-figure-plus terminal dollar gap is material — switch to the cheaper option. Most 401(k) plans have at least one low-cost index option even if it's buried in the menu. A Roth IRA at any major brokerage has effectively zero-cost total-market index funds available (expense ratios at or below 0.04 % for total US stock, total international, and total bond). If your plan truly has no low-cost option, consider rolling to an IRA on separation from the employer, or at minimum contributing to the lowest-cost fund available and directing Roth IRA dollars elsewhere.
If you work with an advisor, the question is whether the advisor's value-add (tax planning, behavioral coaching, estate coordination) exceeds the compounded drag shown here. For simple portfolios with steady contributions, the answer is often no. For complex situations involving concentrated stock, inherited accounts, multi-state tax questions, or business-owner retirement planning, the answer can be yes — but demand specifics on what you're getting for the fee.
The Asset Placement pillar covers the related question of which funds belong in which account type, which is worth another 15–60 bps of after-tax return per year without changing anything about fees.