APR vs. APY: What’s the Difference?

When comparing financial products, you may encounter two similar-looking terms: APR and APY. Both are percentages used to describe the cost or return associated with money, but they are not interchangeable.

Understanding the difference between APR and APY can help you compare loans, credit cards, savings accounts, and other financial products more accurately. The key distinction is compounding: APR generally describes a nominal annual rate, while APY reflects the actual annual return after accounting for compound interest.

What Is APR?

APR, or Annual Percentage Rate, represents the annualized cost of borrowing money. It is commonly used for loans and credit products such as mortgages, personal loans, auto loans, and credit cards.

For example, suppose you borrow $10,000 with an APR of 6%. A simplified calculation might suggest that the annual interest cost is:

$10,000 × 6% = $600

However, the actual amount you pay can depend on factors such as the loan's repayment schedule, fees, and how interest is calculated.

For many consumer loans, APR can include certain fees and charges in addition to the stated interest rate. This makes APR useful when comparing borrowing offers because the interest rate alone may not show the full cost of a loan.

APR and Credit Cards

Credit cards commonly advertise an APR rather than an APY. If a credit card has a 24% APR, that does not necessarily mean the card charges exactly 2% interest every month in every circumstance. Credit card interest is generally calculated using a periodic rate based on the APR, often a daily or monthly rate.

If you carry a balance, interest can accumulate according to the card's terms. If you pay your statement balance in full during the applicable grace period, you may avoid interest on purchases.

What Is APY?

APY, or Annual Percentage Yield, measures the amount an account earns in a year when compound interest is taken into consideration.

APY is particularly common for savings accounts, certificates of deposit (CDs), and other interest-bearing deposit accounts.

For example, imagine you deposit $10,000 into an account with a 5% APY and leave the money untouched for one year. Assuming the APY remains unchanged and there are no fees, you would have approximately:

$10,000 × 1.05 = $10,500

The $500 represents the interest earned over the year.

The important point is that APY accounts for compound interest. When interest is added to your balance, you can subsequently earn interest on that interest.

APR vs. APY: The Main Difference

The simplest way to remember the distinction is:

• APR focuses on the annualized rate associated with borrowing.

• APY reflects the annual return after compounding.

• APR is commonly used for loans and credit cards.

• APY is commonly used for savings and deposit accounts.

Consider a nominal interest rate of 5% compounded monthly. The APY would be slightly higher than 5% because interest is added throughout the year and itself earns interest.

The formula for APY is:

APY = (1 + r/n)ⁿ − 1

Where:

• r = nominal annual interest rate expressed as a decimal

• n = number of compounding periods per year

If the nominal annual rate is 5% and interest compounds monthly:

APY = (1 + 0.05/12)¹² − 1

The result is approximately 5.12%.

Thus, a 5% nominal rate compounded monthly corresponds to an APY of about 5.12%.

Why Compounding Matters

Compounding can have a significant effect over time.

Suppose you deposit $10,000 into an account earning 5% annually. With simple interest, you might calculate $500 in interest during the first year.

With compound interest, the interest is added to the balance. In later periods, the larger balance generates additional interest.

For example:

• Initial deposit: $10,000

• Annual rate: 5%

• Interest after the first year: about $500

• New balance: about $10,500

In the following year, interest can be earned on the $10,500 rather than only the original $10,000.

The longer money remains invested or deposited, the more important compounding can become.

APR vs. APY Example

Suppose two savings accounts advertise the following:

Account A: 5.00% interest rate, compounded monthly
Account B: 5.00% APY

These numbers are not necessarily equivalent.

If Account A's 5.00% is a nominal interest rate compounded monthly, its effective annual yield is approximately 5.12% APY.

Account B's 5.00% APY already accounts for compounding. Therefore, if all other terms are identical, Account A would provide the higher annual yield.

This illustrates why consumers should not compare a nominal interest rate directly with an APY without determining whether both figures account for compounding.

APR and APY for Borrowers

For someone taking out a loan, APR can be more useful than simply looking at the advertised interest rate.

Consider two hypothetical loans:

• Loan A: 7% interest rate with additional fees

• Loan B: 7.25% interest rate with fewer fees

Although Loan A has the lower stated interest rate, its overall APR could be higher after applicable costs are included.

APR can therefore provide a broader picture of the cost of borrowing.

However, you should also consider the loan's term, monthly payment, total interest paid, fees, and other conditions. APR is an important comparison tool, but it should not be the only factor in your decision.

APR and APY for Savers

For savings accounts, APY is generally the more useful number because it shows the annualized earnings after taking compounding into account.

Suppose a bank offers:

• Account A: 4.90% interest rate, 5.00% APY

• Account B: 5.00% interest rate, 5.00% APY

The APYs are the same, so the accounts produce the same annual yield under otherwise identical conditions.

When comparing savings accounts, also check:

• Minimum balance requirements

• Monthly maintenance fees

• Withdrawal restrictions

• Introductory rates

• Whether the rate is variable

• Deposit insurance coverage

• Compounding frequency

A high APY may be less attractive if the account has significant fees or restrictions.

APR vs. APY for Credit Cards

Credit cards usually emphasize APR because they represent borrowing costs rather than investment returns.

A card might advertise a 20% APR, 25% APR, or another rate depending on the product and borrower.

Credit card APRs can also differ by transaction type. For example, purchases, balance transfers, and cash advances may have different rates.

Some cards offer promotional APRs, such as 0% for a limited period. After the promotional period ends, the regular APR may apply.

Because credit card interest can become expensive when balances remain unpaid, understanding the APR and payment terms is important before carrying a balance.

How to Convert APR to APY

If you know the nominal annual interest rate and compounding frequency, you can calculate APY using:

APY = (1 + APR/n)ⁿ − 1

For example, suppose the nominal annual rate is 6% and interest compounds monthly:

APY = (1 + 0.06/12)¹² − 1

The resulting APY is approximately 6.17%.

This demonstrates how compounding increases the effective annual return.

However, this formula is most useful when APR represents a nominal rate without additional fees. For loans, the actual APR calculation can involve more factors.

Which Is Better: APR or APY?

Neither is inherently "better." They serve different purposes.

If you are borrowing money, APR is generally the more relevant figure because it helps describe the annualized cost of credit.

If you are saving or earning interest, APY is generally more useful because it reflects the effect of compounding.

The goal is not to find the higher percentage automatically. Instead, compare the correct measure for the financial product you are considering.

Final Thoughts

APR and APY both help consumers understand financial products, but they answer different questions.

APR is primarily a measure of borrowing costs, while APY measures the effective annual earnings from an interest-bearing account after compounding.

When evaluating a loan, look beyond the advertised interest rate and examine the APR, fees, repayment term, and total cost. When comparing savings accounts, focus on APY while also considering fees, minimum balances, and account conditions.

Once you understand the role of compounding, the difference becomes much easier to remember: APR describes an annualized rate, while APY shows the annual result after compounding.