Investing Basics · 5 min read · June 21, 2026

How Compounding Actually Works

A simple year-by-year walkthrough of how returns on your returns snowball over decades, and why time, not timing, does the heavy lifting.

Compounding is one of the most powerful forces in building wealth over time. At its core it means earning returns on your returns, so your money grows faster and faster the longer it stays invested. Many people hear the phrase but do not fully grasp how dramatically it can change outcomes until they see the numbers play out step by step.

The classic way to understand it starts with a straightforward example. Imagine you invest one thousand dollars at a steady ten percent annual return with all gains reinvested. In the first year your money grows by one hundred dollars, bringing the total to one thousand one hundred. In the second year you earn ten percent not just on the original thousand but on the full one thousand one hundred, so you add one hundred ten dollars and reach one thousand two hundred ten. By the third year the base is larger still and you earn one hundred thirty one dollars more, for a total of one thousand three hundred thirty one.

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