How Does Credit Card Interest Work

Credit card interest is charged when you carry a balance from one billing cycle to the next. If you pay your full statement balance by the due date each month, you likely won't pay any interest at all. ^[1]

Understanding how interest works can help you make better decisions about how you use your card. This guide covers how credit card interest is typically calculated, the different rates that may apply to your account, what can affect the rate you are offered, and steps you could take to reduce or avoid interest charges altogether.

Key points

• Credit card interest is the cost of borrowing money through your card. It is charged when you carry a balance from one billing cycle to the next, rather than paying your statement balance in full by the due date.
• Interest is likely calculated daily based on your average daily balance, using a daily periodic rate derived from your APR. If it compounds daily, the longer you carry a balance, the more you pay.
• Most cards can apply different rates depending on the type of transaction. Purchases, cash advances, balance transfers, and penalty situations can each carry a different APR.

What is credit card interest?

Credit card interest is the price you pay for borrowing money. When you carry a balance from one month to the next, your card issuer charges interest on what you owe. If you pay your balance in full by the due date each month, you can avoid paying interest altogether. ^[2]
That interest can be expressed as an annual percentage rate, or APR, which represents the yearly cost of carrying a balance. The higher the APR, the more expensive it becomes to finance purchases over time. Most cards don't apply a single APR across the board. Purchases, balance transfers, and cash advances can each carry a different rate. ^[3]

How do credit card interest rates work?

Your card's interest rate can be expressed as an APR, but most issuers don't calculate what you owe once a year. Many calculate interest daily, based on your average daily balance. The rate applied each day is called the daily periodic rate, calculated by dividing your APR by either 360 or 365, depending on your card issuer. That rate is multiplied by the amount you owe at the end of each day, and the resulting interest is added to your balance. This means interest can compound daily, so the sooner you pay off all or part of your balance, the less interest you will pay. ^{[4] [5]}

How is a credit card's interest rate determined?

Your rate is based on your application and credit history at the time you apply. Card companies typically offer their best rates to customers with the highest credit scores. ^[6]

Most cards also carry a variable APR, meaning the rate can change over time. A variable APR moves with an index interest rate, such as the prime rate. A fixed APR, by contrast, does not fluctuate with changes to an index. ^[7]

Your rate can also increase after you open the account under certain conditions, including if the index your variable rate is tied to rises, or if your minimum payment is more than 60 days late. If your card company increases your rate after giving 45 days' notice, it must review and re-evaluate the rate at least every six months. ^[8]

Types of credit card interest

Most cards don't apply a single rate to everything. Different transaction types can carry different APRs on the same card: ^[5]

• Purchase APR: The standard rate applied to everyday purchases
• Cash advance APR: Typically higher than the purchase APR, and interest on a cash advance begins accruing from the date of the transaction with no grace period
• Balance transfer APR: The rate applied when you move debt from one card to another, sometimes offered at a promotional rate for a limited period
• Penalty APR: A higher rate that can be applied if you are more than 60 days late on a payment

Do you get charged interest if you make your minimum payment?

You can expect to incur interest charges on your average daily balance when making just your minimum payment. Furthermore, by making just the minimum payment, you're actually ensuring that your average daily balance remains as large as possible without being delinquent or in default.

So making just the minimum payment will mean that you'll owe more in interest than you would have if you had made a larger payment. To save money on interest charges, consider paying as much above the minimum amount as you can afford. ^[9]

Is there any way to avoid credit card interest?

There are several ways to reduce or avoid credit card interest altogether: ^[10]

• Pay your full balance by the due date each month: Most cards offer a grace period, which is the time between the end of your billing cycle and your payment due date. If you pay your statement balance in full by the due date, your purchases during that period won't accrue interest. Note that card issuers are not obligated to offer a grace period, and most cards don't provide one on cash advances or balance transfers.
• Pay more than the minimum each month: If you can't pay your balance in full, paying more than the minimum reduces the time it takes to pay off your debt and lowers the amount of interest you accrue overall.
• Make multiple payments during the month: Since interest likely grows daily, making payments throughout the billing cycle rather than waiting until the due date reduces your average daily balance and the interest charged on it.
• Consider a balance transfer with a 0% introductory APR: Some cards offer a 0% or low APR on balance transfers for a set period after account opening. Any balance remaining when the introductory period ends will typically begin accruing interest at the card's standard rate.
• Limit cash advances: Card issuers often charge a higher interest rate on cash advances than on regular purchases, and interest typically begins accruing from the date of the transaction with no grace period.

How to lower your credit card interest rate

There are steps you can take to reduce how much interest you pay over time.

• Make payments on time: Consistently paying on time may help you lower your interest rate. If your rate was increased because you were more than 60 days late on a payment, your card issuer must reinstate your previous rate once you have made six consecutive on-time minimum payments. ^[8]
• Consider a balance transfer: Many card issuers offer 0% or low introductory APR on balance transfers for a set period. Any introductory rate must remain in effect for at least six months, unless you are more than 60 days late on a payment. ^[11] Note that a balance transfer fee will typically apply, calculated as a percentage of the amount transferred. ^[12]

Do all cards have the same interest rate?

The rate you are offered is based on your application and credit history. Card companies typically offer their best rates to customers with the highest credit scores. ^[6]

The size of your card issuer can also make a significant difference. CFPB data found that small banks and credit unions tended to offer purchase APRs between 8 and 10 percentage points lower than the 25 largest issuers across all credit score tiers. For a cardholder with a $5,000 balance, that difference translates to approximately $400 to $500 in annual savings. Federal credit unions are also subject to a statutory interest rate cap, currently set at 18%. ^[13]

Bottom line

The most important thing to remember from this article is how to minimize the amount of interest you are charged. Once you understand how credit card interest rates work, you can find the best card for your needs. A credit builder card may be a good option if you’re trying to improve your credit. Learn more about Self’s credit building programs today!

Sources

1. Consumer Financial Protection Bureau. What is a grace period for a credit card? https://www.consumerfinance.gov/ask-cfpb/what-is-a-grace-period-for-a-credit-card-en-47/. Accessed June 15th, 2026.
2. Consumer Financial Protection Bureau. What is a credit card interest rate? What does APR mean? https://www.consumerfinance.gov/ask-cfpb/what-is-a-credit-card-interest-rate-what-does-apr-mean-en-44/. Accessed June 15th, 2026.
3. Federal Deposit Insurance Corporation. Credit cards. https://www.fdic.gov/consumer-resource-center/credit-cards. Accessed June 15th, 2026.
4. Consumer Financial Protection Bureau. What is a daily periodic rate on a credit card? https://www.consumerfinance.gov/ask-cfpb/what-is-a-daily-periodic-rate-on-a-credit-card-en-46/. Accessed June 15th, 2026.
5. Consumer Financial Protection Bureau. How does my credit card company calculate the amount of interest I owe? https://www.consumerfinance.gov/ask-cfpb/how-does-my-credit-card-company-calculate-the-amount-of-interest-i-owe-en-51/. Accessed June 15th, 2026.
6. Consumer Financial Protection Bureau. When does a credit card company decide what interest rate to offer me on a credit card? https://www.consumerfinance.gov/ask-cfpb/when-does-a-credit-card-company-decide-what-interest-rate-to-offer-me-on-a-credit-card-en-9/. Accessed June 15th, 2026.
7. Consumer Financial Protection Bureau. What is the difference between a fixed APR and a variable APR? https://www.consumerfinance.gov/ask-cfpb/what-is-the-difference-between-a-fixed-apr-and-a-variable-apr-en-45/. Accessed June 15th, 2026.
8. Consumer Financial Protection Bureau. When can my credit card company increase my interest rate? What can I do to get the rate back down? https://www.consumerfinance.gov/ask-cfpb/when-can-my-credit-card-company-increase-my-interest-rate-what-can-i-do-to-get-the-rate-back-down-en-69/. Accessed June 15th, 2026.
9. Consumer Financial Protection Bureau. A box on my credit card bill says that I will pay off the balance in three years if I pay a certain amount. https://www.consumerfinance.gov/ask-cfpb/a-box-on-my-credit-card-bill-says-that-i-will-pay-off-the-balance-in-three-years-if-i-pay-a-certain-amount-what-does-that-mean-do-i-have-to-pay-that-much-if-i-pay-that-much-and-make-new-purchases-will-i-still-owe-nothing-after-three-years-en-36/. Accessed June 15th, 2026.
10. Discover. How to avoid credit card interest. https://www.discover.com/credit-cards/card-smarts/how-to-avoid-credit-card-interest/ Accessed June 15th, 2026.
11. Consumer Financial Protection Bureau. How long can I keep a low rate on a balance transfer or other introductory rate? https://www.consumerfinance.gov/ask-cfpb/how-long-can-i-keep-a-low-rate-on-a-balance-transfer-or-other-introductory-rate-en-15/ Accessed June 15th, 2026.
12. Consumer Financial Protection Bureau. "Credit Cards Key Terms," https://www.consumerfinance.gov/consumer-tools/credit-cards/answers/key-terms/. Accessed June 15th, 2026.
13. Consumer Financial Protection Bureau. Credit card data: Small issuers offer lower rates. https://www.consumerfinance.gov/data-research/research-reports/credit-card-data-small-issuers-offer-lower-rates/. Accessed June 15th, 2026.

About the author

Becca has over 10 years of experience as a content writer, working across various industries including finance, digital marketing, education, travel, and technology. Her work has been featured in publications including Forbes, Business Insider, AOL, Yahoo, GOBankingRates, and more.