Compound Interest Investing: $10,000 at 8% Grows to $217,000 Over 40 Years. Here’s the Math That Makes It Work
Most investors know compound interest is powerful. Fewer have seen what it looks like in dollar terms across 40 years. At 8% annual return, $10,000 becomes $217,245 — not from clever picking, just from mathematics and time. At 6.5% (after a 1.5% mutual fund fee) it becomes $124,000 instead. That $93,000 gap is entirely fees. This guide covers the full compounding formula, the fee drag math, the starting-early vs starting-late comparison, and links to a free calculator so you can model your own numbers.
