APY (Annual Percentage Yield)

Definition

APY shows what your money actually earns in a year when interest starts earning interest. Unlike a plain interest rate, APY includes the compounding effect, meaning you get paid on your deposits plus on the interest that's already been added. This is especially important for savings accounts because small differences in APY can grow into real money over years.

Why it matters

APY is what actually determines whether your savings will outpace inflation. A high-yield savings account at 4.90% APY will earn you almost $50 more per year than a 4.50% APY account on a $10,000 balance. Over 10 years with compounding, the gap widens to hundreds of dollars. When shopping for savings vehicles, APY is the only number that matters for comparing real returns.

Quick example

You deposit $10,000 in a savings account paying 4.90% APY. At the end of year one, your balance is about $10,490. In year two, you earn interest on $10,490, not just the original $10,000. After 10 years, you'd have around $15,290. A competing account at 4.50% APY would have only about $14,900.

The bottom line

Knowing what APY (Annual Percentage Yield) means helps you make better day-to-day money decisions. It makes rates, account options, and tradeoffs easier to compare.