Fees and compounding

A fee is taken every year from a growing balance, so small percentages compound into large dollar amounts over decades.

Compounding Expense ratio Advisory fee Sales load Net return

Compounding in both directions

Compounding means earning returns on past returns. Future value = starting amount × (1 + yearly return)^years. The same maths works against you with fees: every dollar taken out is a dollar that no longer compounds.

Where fees hide

Common costs include a fund's expense ratio, advisory fees charged as a percentage of assets, sales charges (loads) on some funds, trading commissions and account fees. Ask for every fee in writing and check how it's calculated.

A cheaper option isn't automatically better — what you get matters — but you should know exactly what you're paying for.

Why 1% isn't small

A 1% yearly fee sounds tiny next to a return. But if the portfolio earns a hypothetical 6% before fees, a 1% fee takes one-sixth of the growth every year. Over decades that gap widens because it compounds.

Worked example

30 years with and without a 1% fee (hypothetical 6% return)

Simplification: treat the fee as reducing the yearly return (6% gross − 1% fee ≈ 5% net). Real fee maths varies slightly.
$10,000 × 1.06³⁰ ≈ $10,000 × 5.7435 ≈ $57,435.
$10,000 × 1.05³⁰ ≈ $10,000 × 4.3219 ≈ $43,219.
Difference ≈ $14,216 — more than the original $10,000 invested.

A fee that looks like '1%' can cost you about a quarter of the final balance over 30 years in this example. Returns are never certain; fees are.

Common misconceptions

“Higher fees mean better performance.”

Price doesn't guarantee skill. Fees are certain; any extra performance is not.

“A 0.5% fee difference doesn't matter.”

Compounded over decades it can add up to thousands of dollars.

Checkpoint