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Investment Fee Calculator

Model how annual percentage and fixed fees can reduce a long-term investment balance, with a no-fee baseline, annual table and private saved comparisons.

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Compare two fee structures against a no-fee baseline

Formatting only; no exchange conversion.
Scenario A
Scenario B
Timing model

Monthly gross growth, then percentage and fixed fees, then the end-of-month contribution. Each scenario is simulated independently.

Saved comparisons on this device

Investment values and fee assumptions remain local and are not placed in URLs or analytics.

How investment fee drag is calculated

Direct answer: each scenario starts with the same balance, contributions and gross return. ToolBullet deducts the modelled fees monthly, then separates direct fees from the growth those deducted amounts could otherwise have earned.

Total fee drag = no-fee ending value − after-fee ending value
Lost growth on fees = total fee drag − direct fees deducted
Example: 10,000 initially plus 200 a month for 20 years at a constant 7% gross annual effective return reaches about 140,204.12 with no fees. A 1% annual fee plus 120 a year reduces the modelled ending value to about 117,132.11: direct fees of about 13,165.18 plus about 9,906.84 of lost growth.
Model boundaries
  • Returns and fees are constant for comparison and are not forecasts.
  • Percentage fees use an equivalent monthly rate; fixed annual fees are spread equally across months.
  • Contributions occur at month end after growth and fees.
  • Tax, bid/offer spreads, trading costs, tiered charges and product-specific fee timing are excluded unless represented in the entered fixed fee.
  1. Investor.gov: how fees and expenses affect portfolios
  2. Investor.gov: understanding total and ongoing fees
  3. Investor.gov: mutual fund and ETF fees and expenses

Why direct fees understate the long-term effect

A fee removes money that can no longer compound. The calculator reports direct deductions, lost growth and total drag separately, making the opportunity cost visible instead of showing only a fee total.

Read the investment-fee guide →

Method reviewed 11 July 2026. Formula, timing conventions and official source context are visible here and in the linked guide.

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Investment Fee Calculator FAQ

What does total fee drag include?

Total fee drag is the difference between the no-fee projection and the ending value after fees. It includes direct fees deducted and the growth those deducted amounts no longer earn.

How is an annual percentage fee applied?

ToolBullet converts the entered annual percentage fee to an equivalent monthly retention rate and deducts it after monthly gross growth. This produces the entered annual fee effect over a full year if the balance were otherwise unchanged.

How is a fixed annual fee modelled?

The annual fixed fee is divided equally across 12 months as a transparent planning estimate. Actual providers may charge on different dates or use minimums, caps or tiered schedules.

When are monthly contributions added?

Contributions are added at month end after that month’s growth and fees. This prevents the first contribution from receiving a full extra month of growth.

Can fees make the balance negative?

No. Each monthly fee is capped at the available balance before the contribution is added. The model never carries a negative investment balance.

Are projected returns guaranteed?

No. The gross return is a constant user-entered assumption. Markets, product performance, tax, trading costs and provider charges can vary.

Does the currency selector convert values?

No. It changes formatting only. Enter all initial values, contributions and fixed fees in one currency.