The number that looks small
A 1.2% actively managed fund versus a 0.1% index fund — a 1.1 percentage point gap. On a single year's balance, that looks trivial.
Where it actually goes
Compounded over 30 years on a growing balance, that 1.1% gap can consume more than a quarter of the final portfolio value, because the fee is charged every year on an ever-larger base, including the returns you would have earned on the money the fee took.
The bar active funds have to clear
To justify the higher fee, an active fund doesn't just need to beat its index — it needs to beat it by more than the fee gap, consistently, after taxes. Very few manage it over long horizons.
