Fee Drag Outcome
Ending value A
$881,053.48
Ending value B
$776,146.57
Fee drag difference
$104,906.91
Cumulative fees (B)
$70,251.13
Savings & Investing
Investment Fee Impact Calculator
Compare two expense-ratio scenarios and quantify how small fee differences compound into large long-term outcome gaps.
Portfolio Value Over Time
Fee-ratio scenarios over identical contribution path
Y0Y5Y25
Scenario A
$881,053.48
Scenario B
$776,146.57
Fee Cost Stack
Absolute fees and ending-value drag
Cumulative fees A
$12,723.80
Cumulative fees B
$70,251.13
Ending-value drag
$104,906.91
How to use it
- Enter the current balance, annual contribution, gross return, years, and two expense ratios using funds that are actually comparable. A fee comparison only matters if the investment exposure is broadly similar.
- Read ending value difference and cumulative fees rather than only looking at the percentage fee gap. A 1.00% annual fee difference can remove tens or hundreds of thousands of dollars over a multi-decade horizon.
- If two diversified options are similar and one costs 0.30% or more less each year, the cheaper one needs a strong reason not to win. Fee drag is one of the few guaranteed negatives in investing.
- Use the lower-cost option if taxes, liquidity, and employer-plan constraints allow, then confirm the long-run impact again in the compound interest calculator with the new net return.
- Re-run when changing funds, rolling over accounts, or updating the time horizon. Track expense ratio, any plan-level admin fees, and the projected ending-value gap.
AI Integrations
Contract, discovery endpoints, and developer notes for agent use.
Always available for agents
AI Integrations
Contract, discovery endpoints, and developer notes for agent use.
Tool contract JSON
https://aifinhub.io/contracts/investment-fee-calculator.jsonStable input and output contract for this exact tool.
Human review
People can use the browser page to sense-check outputs and charts, but agents should still execute against the contract and discovery endpoints.
- /agent-tools.json - machine-readable tool index.
- /llms.txt - human-readable model discovery guide.
- /.well-known/webmcp.json - WebMCP capabilities manifest.
- /.well-known/ai-plugin.json - plugin-style discovery manifest.
{
"tool": "investment_fee_impact",
"initial_investment": 50000,
"annual_contribution": 10000,
"years": 25,
"gross_return_percent": 7,
"expense_ratio_a": 0.15,
"expense_ratio_b": 0.9
} Expand developer notes
Agent playbook
- Resolve Investment Fee Impact Calculator from /agent-tools.json and open its contract before execution.
- Validate inputs against the contract schema instead of scraping labels from the page UI.
- Open the browser page only when a person wants to review charts, assumptions, or related tools.
Agent FAQ
Should ChatGPT, Claude, or another agent click through the UI?
No. Start with /agent-tools.json, then follow the tool's contract URL. The page UI is for human review, not parameter discovery.
When do tools show Quick and Advanced?
Every tool opens in Quick Start first. Advanced Controls keeps the same scenario, reveals more assumptions or diagnostics, and every tool keeps AI integrations inline below the instructions.
When should an agent still open the browser page?
Open it when a human wants to sense-check the output, review the chart, or keep exploring related tools after the calculation finishes.
Questions people usually ask
Why do small fee differences matter?
Fees compound every year and reduce the capital base that future returns can grow.
Does this assume identical market returns?
Yes. Both scenarios use the same gross-return assumption so fee drag is isolated.
Can I compare ETFs and mutual funds?
Yes. Enter each fund expense ratio and evaluate long-horizon cost impact.
Is this tax-adjusted?
No. This model isolates fee impact and excludes account-level tax behavior.
Is this professional advice?
No. Outputs are planning estimates only — not financial, tax, or investment advice.
Related Resources
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Every link here is tied directly to Investment Fee Impact Calculator. Use the explanation, formula, examples, and benchmarks to pressure-test the calculator output from first principles.
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