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HoldingCost

Investment fee drag calculator

Compare the long-term impact of management fees against a fee-free baseline and an optional low-cost comparison fund.

Calculator investments

Logic updated April 2026

This calculator shows how investment management fees compound over time and erode the final balance of an investment. A fee that looks small in any single year — say, 1% — compounds into double-digit percentage drag over a multi-decade horizon. The calculator lets you compare the headline-fee scenario against a fee-free baseline and an optional lower-fee alternative.

How this is calculated

Formula 

netGrowthFactor = (1 + return / 100) − (fee / 100) ; balance(year n) = initial × netGrowthFactor^n

Step-by-step

  1. Calculate the net growth factor by subtracting the annual fee percentage from the gross return — fees are taken from the portfolio each year
  2. Apply the same logic for the fee-free baseline (fee = 0) and the optional comparison fee
  3. For each year, compound the previous year's balance by the relevant growth factor
  4. Track three trajectories side by side: at the headline fee, at zero fees, and at the comparison fee
  5. Calculate fee drag as the difference between the fee-free balance and the headline-fee balance at the end of the horizon
  6. Express fee drag as a percentage of the gross-return balance to make it comparable across scenarios
Rounding mode
ROUND_HALF_UP
Precision
20-digit internal precision (Decimal.js), rounded to 2 decimal places for display
Logic last reviewed

Assumptions & limitations

What this calculator assumes

  • Gross annual return is held constant across the full investment horizon
  • Fees are deducted annually from the portfolio value
  • No additional contributions or withdrawals are modelled
  • Taxes, transaction costs, and cash drag are not modelled

What this calculator doesn’t account for

  • Does not model performance fees that scale with returns
  • Does not include bid-ask spreads, brokerage, or trading costs separate from the headline fee
  • Does not factor in tax wrappers that may shelter some fees from compounding effects
  • Treats the fee as flat over the horizon — real fees often scale with assets and may decrease at higher balances
  • Does not include the cost of advice, which can add 0.5–1% on top of the fund-level fee

Worked example

An investor has $100,000 to invest for 30 years at an assumed 7% gross return. They compare a 1.5% high-fee fund against a 0.2% low-cost index tracker.

Input Value
Initial investment $100,000
Annual gross return 7%
Management fee 1.5%
Comparison fee 0.2%
Investment horizon 30 years

Fee-free balance: ~$761,000 — At 1.5%: ~$432,000 — At 0.2%: ~$697,000 — Fee drag (1.5%): ~$329,000

At 7% gross with no fees, $100k grows to about $761k over 30 years. At 1.5% fees, the net growth factor is 1.055 (instead of 1.07), and the balance grows to only $432k. The 1.3-percentage-point difference between funds (1.5% vs 0.2%) compounds into roughly $265,000 of difference at the 30-year horizon — more than 2.5× the original investment, lost to fees.

Frequently asked questions

What is fee drag?

The cumulative reduction in investment returns caused by fees compounding over time. A 1% annual fee doesn't just cost 1% per year — it cuts the compound growth factor by 1 percentage point every year, so over 30 years a 1% fee on a 7% return takes about 30% off the final balance, not 30%. The longer the horizon, the more dramatic the drag.

How do small fee differences compound over decades?

Hugely. Each year you pay a fee, that money no longer compounds for you for the rest of the horizon. A 1% fee in year 1 of a 30-year investment costs you (1% × 30 years × compounding) — typically 4–6× the headline fee in lost final wealth. That's why 0.2% vs 1.5% (a 1.3-point difference) can mean hundreds of thousands of dollars on a long-term portfolio.

Management fee vs performance fee?

Management fees are charged on assets under management regardless of performance — typical for index funds (0.05–0.5%) and most retail mutual funds (0.5–2%). Performance fees are a percentage of returns above a benchmark — common in hedge funds (often 20% of profits above a hurdle rate). Performance fees create stronger alignment but can make total fees in winning years quite high. This calculator models only management fees.

What is a reasonable fund fee?

Index ETFs tracking major markets typically charge 0.05–0.30%; actively managed equity funds charge 0.5–1.5%; hedge funds and alternatives charge 1–2% plus 10–20% performance. The market consensus is that fees above 0.5% are hard to justify on long-term passive investments because the active manager has to consistently beat the benchmark by more than the fee — historically, very few do over 20+ year periods.

How can I reduce fee drag?

Three options: (1) use low-cost index funds or ETFs as the core of your portfolio — fees of 0.05–0.20% are widely available; (2) consolidate small accounts into one platform with lower per-account fees; (3) avoid layered fees (a fund-of-funds inside a managed account inside an advised platform stacks 2–3% of fees onto the same underlying assets). Reducing fees is one of the few changes you can make that mathematically guarantees higher net returns.

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