APY vs. Interest Rate: What's the Difference?

⏱️ 3 Minute Read

Savings accounts almost always advertise APY, not a plain interest rate. That's not a style choice — the two numbers actually measure slightly different things.

Interest rate: the base number

The interest rate is the simple, stated rate — the base percentage used to calculate interest before compounding is factored in.

APY: what you actually earn

APY stands for Annual Percentage Yield. It includes the effect of compounding — earning interest on interest — over a full year. Because of that, APY is always equal to or higher than the plain interest rate on the same account.

The more frequently interest compounds — daily instead of monthly, for example — the bigger the gap between the stated rate and the APY.

A simple way to see the difference

A 5% interest rate that compounds daily produces a slightly higher APY than 5% — often around 5.13% — because each day's interest starts earning its own interest going forward. The rate stays the same; the compounding is what pushes the real return higher.

Why this matters when comparing accounts

Two accounts advertising the same interest rate can pay out differently depending on how often they compound. Comparing APY directly sidesteps that problem, since APY already accounts for compounding frequency — it's the number that reflects what you'll actually earn over a year.

Compare real APY numbers across savings accounts.

The calm takeaway

When comparing savings accounts, APY is the number to trust. It already factors in compounding, so it reflects what you'll actually earn — not just the stated rate before that math happens.