Investment Drag Calculator
Compare projected portfolio values and cumulative fee drag across two investment strategies over time.
Investment Planning · Last reviewed: August 10, 2026
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Overview
The Investment Drag Calculator compares two hypothetical portfolio projections that share the same starting balance, contributions, time horizon, and gross return but use different annual fee ratios.
It shows each projected ending value, the difference between them, and each option's cumulative shortfall from an otherwise identical no-fee projection.
Scope and Use
Use the result to illustrate how two constant asset-based fee ratios can affect a deterministic annual-growth projection. It is not a forecast of investment performance or a complete cost comparison.
Outside this model
- Market volatility, sequence of returns, losses, and changing returns or fees.
- Taxes, inflation, trading costs, commissions, loads, spreads, and advisory billing details.
- Contribution timing other than one end-of-year contribution.
- Withdrawals, distributions, rebalancing, manager changes, and cash flows within a year.
- Risk, liquidity, product features, suitability, recommendations, and investment advice.
Inputs and Outputs
Labels and ordering follow the active Investment Drag calculator configuration. Every projection value is supplied by the user; there are no governed or overridable assumptions.
| Field | Format | Meaning | Interpretation |
|---|---|---|---|
| Starting Investmentinput | Currency | Portfolio balance at the beginning of the first projection year. | This amount may be zero only when the annual contribution is greater than zero. |
| Annual Contributioninput | Currency | Constant amount added after return and fee calculations at the end of every year. | The contribution receives no return and incurs no fee in the year it is added. |
| Yearsinput | Number | Number of years to project investment growth. | — |
| Fee Ratio Oneinput | Percentage | Constant annual asset-based fee rate for investment option one. | Applied to assets after that year's gross return and before the year-end contribution. |
| Fee Ratio Twoinput | Percentage | Constant annual asset-based fee rate for investment option two. | Applied using the same timing convention as fee ratio one. |
| Investment Returninput | Percentage | Constant annual gross return applied to every projected year before fees. | This is a deterministic user-entered assumption, not a forecast or governed default. |
| Investment One Ending Valueoutput | Currency | Projected ending value after fee ratio one. | — |
| Investment Two Ending Valueoutput | Currency | Projected ending value after fee ratio two. | — |
| Ending Value Differenceoutput | Currency | Investment one ending value less investment two ending value. | — |
| Percent Differenceoutput | Percentage | Ending value difference as a percent of investment two. | — |
| Total Fee Drag Oneoutput | Currency | No-fee ending value less option one's ending value. | This is modeled cumulative fee drag, including lost growth, not a ledger of fees charged. |
| Total Fee Drag Twooutput | Currency | No-fee ending value less option two's ending value. | This is modeled cumulative fee drag, including lost growth, not a ledger of fees charged. |
| Fee Drag Differenceoutput | Currency | Option one's modeled fee drag less option two's modeled fee drag. | Its sign is the inverse of Ending Value Difference before independent display rounding. |
- Field
- Starting Investmentinput
- Format
- Currency
- Meaning
- Portfolio balance at the beginning of the first projection year.
- Interpretation
- This amount may be zero only when the annual contribution is greater than zero.
- Field
- Annual Contributioninput
- Format
- Currency
- Meaning
- Constant amount added after return and fee calculations at the end of every year.
- Interpretation
- The contribution receives no return and incurs no fee in the year it is added.
- Field
- Yearsinput
- Format
- Number
- Meaning
- Number of years to project investment growth.
- Interpretation
- —
- Field
- Fee Ratio Oneinput
- Format
- Percentage
- Meaning
- Constant annual asset-based fee rate for investment option one.
- Interpretation
- Applied to assets after that year's gross return and before the year-end contribution.
- Field
- Fee Ratio Twoinput
- Format
- Percentage
- Meaning
- Constant annual asset-based fee rate for investment option two.
- Interpretation
- Applied using the same timing convention as fee ratio one.
- Field
- Investment Returninput
- Format
- Percentage
- Meaning
- Constant annual gross return applied to every projected year before fees.
- Interpretation
- This is a deterministic user-entered assumption, not a forecast or governed default.
- Field
- Investment One Ending Valueoutput
- Format
- Currency
- Meaning
- Projected ending value after fee ratio one.
- Interpretation
- —
- Field
- Investment Two Ending Valueoutput
- Format
- Currency
- Meaning
- Projected ending value after fee ratio two.
- Interpretation
- —
- Field
- Ending Value Differenceoutput
- Format
- Currency
- Meaning
- Investment one ending value less investment two ending value.
- Interpretation
- —
- Field
- Percent Differenceoutput
- Format
- Percentage
- Meaning
- Ending value difference as a percent of investment two.
- Interpretation
- —
- Field
- Total Fee Drag Oneoutput
- Format
- Currency
- Meaning
- No-fee ending value less option one's ending value.
- Interpretation
- This is modeled cumulative fee drag, including lost growth, not a ledger of fees charged.
- Field
- Total Fee Drag Twooutput
- Format
- Currency
- Meaning
- No-fee ending value less option two's ending value.
- Interpretation
- This is modeled cumulative fee drag, including lost growth, not a ledger of fees charged.
- Field
- Fee Drag Differenceoutput
- Format
- Currency
- Meaning
- Option one's modeled fee drag less option two's modeled fee drag.
- Interpretation
- Its sign is the inverse of Ending Value Difference before independent display rounding.
Methodology
For each option, the annual effective growth factor multiplies one plus the gross return by one minus that option's fee ratio. This is the asset-level convention approved in AC-16.
Here g and f are the entered gross return and fee ratio expressed as decimals. The fee is therefore deducted from assets after growth, not simply subtracted from the return rate.
C is the constant end-of-year contribution. The same recurrence is run for both fee options and for a zero-fee baseline.
Fee drag is the no-fee ending value minus each option's ending value. Ending Value Difference is option one less option two; Percent Difference divides that difference by option two. Currency outputs are rounded independently to whole dollars using half-up rounding, and the percentage is rounded to two decimals, after full-precision calculations.
Assumptions and Limitations
Model assumptions
- Gross return, fees, and annual contribution stay constant.
- Return is applied before the asset-level fee each year.
- The contribution is added at each year end.
- Both options otherwise have identical cash flows and return.
Limitations
- Results are hypothetical deterministic projections.
- Fee drag includes foregone compounding and is not a fee statement.
- Actual product fees may use different bases, timing, tiers, or waivers.
- Currency outputs are independently rounded to whole dollars using half-up rounding.
Selected Sources
- How Fees and Expenses Affect Your Investment Portfolio
U.S. Securities and Exchange Commission, Office of Investor Education and Assistance · Published July 23, 2025 · Retrieved August 10, 2026
The general principle that ongoing asset-based fees and expenses reduce portfolio value and can compound into material long-term differences. It does not support this calculator's exact annual timing convention, user-entered return, fee ratios, or projected results.
Published July 23, 2025; reviewed August 10, 2026