What Is APY? Your Quick Guide To Annual Percentage Yield

Annual percentage yield (APY) is the total amount of interest you'll earn on a deposit account over one year, including the effects of compound interest. Because APY factors in compounding, it gives you a more accurate picture of how your money grows than a standard interest rate.

Whether you're comparing a savings account, certificate of deposit (CD) or money market account, understanding APY can help you choose the best place to grow your money.

Looking for a high-yield savings account? MoneyLion makes it easy to compare top-rated options from trusted banking partners. Based on your preferences, you’ll get matched with accounts that offer competitive APYs, low fees and flexible features—so you can grow your savings without the guesswork.

Key Takeaways

• APY shows your true earnings because it includes compound interest. It gives a clearer picture of growth than a basic interest rate.

• APY is what you earn, while annual percentage rate (APR) is what you pay. Compare APY on savings, CDs and money market accounts, and compare APR on loans and credit cards.

• More frequent compounding means faster growth. A 5% rate compounded monthly works out to a 5.12% APY, so check how often an account compounds, not just its rate.

• Decide whether you want a fixed or variable APY. A CD locks your rate for the term, while a high-yield savings account rate can rise or fall with the market.

Summary generated by AI, verified by MoneyLion editors

What Is APY?

APY is the percentage that shows how much your money can grow in one year, including the effects of compound interest.

Unlike a basic interest rate, APY reflects how often interest is added to your account, giving you a clearer picture of your actual earnings.

How Is APY Calculated?

Although most banks calculate APY for you, understanding the formula can help you compare accounts more effectively. Here's a breakdown with a formula and an easy APY example:

APY = (1 + r/n)ⁿ – 1

Where:

• r = the annual interest rate in decimal form

• n = number of compounding periods per year

Example:

Say you deposit $1,000 in a savings account with a 5% annual interest rate, compounded monthly. In the formula, that makes r = 0.05 and n = 12.

Here's how it works step by step:

• Convert the rate to a decimal. A 5% rate becomes 0.05.

• Divide by the compounding periods. 0.05 ÷ 12 = 0.004167.

• Add 1. 1 + 0.004167 = 1.004167.

• Raise it to the 12th power. (1.004167)¹² ≈ 1.0512.

• Subtract 1. 1.0512 − 1 = 0.0512.

• Convert to a percentage. 0.0512 = 5.12%.

So your $1,000 earns a 5.12% return over the year, not just 5%. That extra 0.12% is compounding at work.

APR vs APY: What's the Difference?

APR is what you pay. APY is the interest that you earn. Here are some main ways of distinguishing the two. 

How Does Compound Interest Work?

Compound interest is what makes APY more meaningful than a standard interest rate. Instead of earning interest only on your original deposit, you also earn interest on the interest that's already been added to your account. The more frequently interest compounds, the faster your savings can grow.

Fixed APY vs. Variable APY

Not all APYs stay the same over time. Some are fixed for the life of the account, while others can change as interest rates move.

Fixed APY

Stays the same. Think CDs or promo-rate accounts. Great for planners who hate surprises.

• Example: You open a 12-month CD at 4.50% fixed APY. It stays 4.50% the whole time, no matter what the market does.

Variable APY

Changes with the market. You'll see this with high-yield savings accounts. Can go up or down.

• Example: Your online savings account starts at 4.75% APY but drops to 4.30% next quarter.

How To Choose Between Fixed and Variable APY

The right choice depends on your savings goals, how soon you'll need your money and whether you expect interest rates to change.

Choose a Fixed APY If

• You want predictable earnings.

• You're opening a CD.

• You think rates may fall.

Choose a Variable APY If

• You want flexibility.

• You're using a high-yield savings account.

• You're comfortable with rates changing.

How Does the Fed Rate Affect APY?

Banks often adjust savings account APYs when the Federal Reserve changes interest rates.

• When the Fed raises rates, APYs on savings accounts and money market accounts generally increase.

• When the Fed cuts rates, those APYs often fall.

Because forecasters are split on possible cuts later in 2026, locking in a competitive rate today may be a smart choice.

What Is a Good APY?

A “good” APY depends on a lot of factors, like the Fed Funds rate, overall market conditions and the type of bank you're using. Here’s a quick cheat sheet:

Pro Tip

To find APY that works for you, consider online banking options. Credit unions also tend to offer better yields for members.

Bottom Line

• Compare APYs, not just the interest rate.

• Check whether the APY is fixed or variable.

• Pay attention to how often compounding happens.

• Shop around before opening an account.

• Once you know what APY you're looking for, compare options from MoneyLion One, online banks and local brick-and-mortar banks.

FAQs

How does APY work on a savings account?

You earn interest — usually calculated daily and paid monthly — based on your account balance and APY.

What is APY on a CD?

APY is the amount of interest you’ll earn on your CD over a year, including compounding. Fixed term, fixed rate.

What is the difference between APY and interest rate?

When comparing APY vs. interest rates, the difference comes down to compounding. The interest rate is the base number. APY includes compounding, giving you the true return.

What is 5% APY on $1000?

A 5% APY on $1,000 can earn you $50 over one year.

What is dividend rate vs. APY?

Credit unions often list a dividend rate of simple interest and an APY that includes compounding. APY shows your real return.

Does APY change if the Fed cuts rates?

Usually, yes. Variable APYs on savings and money market accounts often fall when the Federal Reserve cuts interest rates. CDs are different because the APY is locked in for the term once you open the account.

Key Terms

• APY: The total interest you can earn on a deposit account in one year, including compounding. It's the truest measure of what your money will grow to.

• Compound interest: Interest earned on both your original deposit and the interest already added to your account. The more often it compounds, the higher your APY.

• Interest rate: The base percentage a bank pays on your balance before compounding is factored in. It's always equal to or lower than the APY.

• APR: The yearly cost of borrowing, including interest and certain fees. It's the number to compare on loans and credit cards.

• Compounding frequency: How often interest is calculated and added — daily, monthly, quarterly or yearly. Daily compounding maximizes your APY.

• Fixed vs. variable APY: A fixed APY, as on a CD, stays the same for the term, while a variable APY, as on a savings account, can change with the market.

• Dividend rate: The simple-interest rate credit unions quote alongside an APY. The APY, which includes compounding, reflects your real return.

Summary generated by AI, verified by MoneyLion editors

Sources

• Consumer Financial Protection Bureau. "§ 1030.2 Definitions."

• Consumer Financial Protection Bureau. 2023. "What is a certificate of deposit (CD)?"

• Consumer Financial Protection Bureau. "§ 1026.14 Determination of annual percentage rate."