Investment Fee Calculator

Gross portfolio (no fees)

FV = P×(1+r_gross)^n + PMT×((1+r_gross)^n − 1)/r_gross

P = $50,000, r = 0.6667%/mo, n = 360 months

= $1,291,966

$230,000 contributed, $1,061,966 from market growth — a 5.62× return multiple at 8% gross annual return.

Standard TVM compound growth formula — SEC investor education, Vanguard research

Net annual return after fees

r_net = r_gross − total_fee_rate

= 8.00% − 0.04% = 7.96%

= 7.960% net → portfolio $1,279,463

Every percentage point of fees reduces your compounded return by exactly 1% per year — not 1% of your gains, but 1% of your full portfolio balance every year. This is why fees compound against you the same way returns compound for you.

Fee drag on net return — Sharpe (1991), 'The Arithmetic of Active Management'; Bogle, 'The Little Book of Common Sense Investing'

Fee drag (dollar cost)

Fee drag = gross portfolio − net portfolio

= $1,291,966 − $1,279,463

= $12,503

$12,503 is the compounded cost — not just the annual fee times years. Because fees reduce the balance that earns future returns, the damage compounds exponentially. A flat 0.04% fee costs dramatically more than 0.04% of your final balance.

% of gross portfolio lost to fees

% lost = fee drag / gross portfolio

= $12,503 / $1,291,966

= 0.97% of gross portfolio

Fees consumed 0.97% of your total gross portfolio. More painfully, they consumed 1.18% of just your market growth — the part you worked for decades to accumulate.

Fee drag as % of market growth

% of growth = fee drag / (gross_FV − total_contributions)

= $12,503 / $1,061,966

= 1.18% of your market gains surrendered to fees

You contributed $230,000 and the market grew your money by $1,061,966. Fees consumed 1.18% of that market growth. This is the most honest way to think about fee impact — as a tax on your investment returns.

Low-cost index fund comparison (0.03% fee)

savings = FV(0.03%) − FV(current_fee%)

= $1,282,577 − $1,279,463

= $3,113 more with a 0.03% index fund

Switching from 0.04% to 0.03% (Vanguard-style) would add $3,113 to your 30-year balance — purely from the fee difference. This represents the floor for what passive investing can deliver relative to higher-cost funds.

0.03% benchmark — Vanguard Total Stock Market Index Fund expense ratio (VTSAX); Morningstar fund cost data

Retirement income lost to fees (4% rule)

income_lost = fee_drag × 4% / 12

= $12,503 × 0.04 / 12

= $42/month less in retirement

Applying the 4% rule: your gross balance supports $4,307/mo, your net supports $4,265/mo — a $42/mo gap from fees alone. Over a 30-year retirement that's $15,003 in total income foregone.

4% rule — Bengen (1994); Trinity Study (Cooley, Hubbard, Walz 1998)

Monthly contribution equivalent of fees

months = fee_drag / monthly_contribution

= $12,503 / $500

= 25 months of your $500/mo contributions

Your fees over 30 years cost the equivalent of 25 months (2.1 years) of your monthly contributions. Every dollar you put in, fees quietly took back more than you might expect.