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How does credit card interest work?

Everything you need to know about credit card interest, including how it’s calculated, how it varies based on your creditworthiness and how to avoid it

Summary

Credit card interest can come in many forms and is calculated based on a unique formula. Whether you’ve had credit cards for years or are planning to get your first one, here’s everything you need to know about credit card interest, including how to avoid it.

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If you have a credit card, you may be required to pay interest, depending on how you use the account.

Unlike installment loans, however, credit card interest can come in many forms and is calculated based on a unique formula.

Whether you’ve had credit cards for years or are planning to get your first one, here’s everything you need to know about credit card interest, including how to avoid it.

See related: Which credit card should I get?

What is interest?

Interest is the cost of borrowing money with a credit account. The amount you pay in interest can vary based on the type of credit account you have, whether there’s collateral involved and your creditworthiness.

For example, a mortgage loan typically carries a much lower interest rate than an unsecured personal loan because if you default, the mortgage lender can foreclose the home and sell it to recoup its losses. With the unsecured personal loan, there is no collateral to repossess.

With both installment loans and credit cards, interest is calculated as a percentage of the account balance. That percentage is annualized to give you an annual percentage rate (APR).

Credit card interest is different from other types of loan interest because while your account may have an APR attached, it doesn’t necessarily mean that you’ll pay it. Most credit cards offer a grace period between your statement date and due date, during which you can pay off your balance from the previous month interest-free.

Credit cards also come with a handful of different types of APRs, depending on how you use the account.

How does credit card interest work?

Credit cards typically have variable interest rates that fluctuate based on the going prime rate, which is based on the federal funds rate set by the Federal Reserve and is a bench mark that lenders use to set for home equity lines of credit and credit cards.

This means your APR can go up and down over time. It’s also important to note that credit card issuers typically calculate how much interest you owe daily rather than monthly.

To calculate how much interest you’re actually paying on your credit card, you’ll first need to convert your APR into a daily interest rate.

  • To do this, credit card issuers divide your APR by either 360 or 365. For example, if you have a 20% APR, your daily periodic rate could be 0.0556% or 0.0548%, depending on which bank or credit union issued your account.
  • You’ll then calculate your average daily balance. To do this, start with your unpaid balance from the previous statement period (if applicable), then add up your balance at the end of each day during the current statement period. Combine them all and divide the sum by the number of days in the billing period to get your average daily balance.
  • Once you have both your average daily balance and your daily periodic rate, multiply the two, then multiply that result by the number of days in your billing cycle.
  • For example, let’s say your average daily balance was $2,400 over 30 days, and your card issuer uses 365 days to calculate the daily periodic rate. Multiply $2,400 by 0.0548% to get $1.3152, which you’ll multiply by 30 days to get $39.46.

See related: What happens when you miss a credit card payment?

Types of APRs

While credit cards often advertise only one APR in their marketing materials, there can be as many as four, depending on the card:

Purchase APR: This is the interest rate you pay on purchases you make with your account. The purchase APR typically doesn’t kick in unless you have a remaining balance after your due date each month, so it’s best to pay your bill in full before then.

Some cards offer an introductory 0% APR on purchases for a set period, allowing you to make purchases and pay them off interest-free, regardless of whether you carry a balance from month to month. However, the regular purchase APR will apply to any remaining balance after the promotional period ends.

Balance transfer APR: Many credit cards allow you to transfer a balance from another card, often with an introductory 0% APR for a predetermined period. During this time, you can pay off your transferred balance interest-free. Once the period is over, however, the regular balance transfer APR – which usually mirrors the purchase APR – kicks in.

Unless you have an introductory 0% APR, balance transfers typically start accruing interest immediately, with no grace period.

Cash advance APR: In addition to making purchases directly with your card, you can use it to get cash from an ATM or bank teller. When you do this, interest will start accruing immediately based on the card’s cash advance rate, which is typically higher than the purchase APR.

Penalty APR: The penalty APR, which is often much higher than the card’s purchase APR, kicks in if you’ve been late at least 60 days on a payment, and your card issuer has given you at least 45 days’ written notice before increasing your rate. You may also lose your grace period.

If you’ve triggered a penalty APR, it will remain on the account until you’ve made on-time payments for six months.

How is it determined, and what is the average?

While some credit cards offer a single APR to all cardholders that are approved, most provide a range of APRs. The APR you receive is based on the type of credit card you apply for and your creditworthiness. If you have a stellar credit history, a low debt-to-income ratio and other favorable attributes, your chances of getting an APR on the lower end of the spectrum increase.

However, if your credit history has some issues or your debt payments take up a large portion of your gross monthly income, you could end up with a higher interest rate.

People with limited, fair or bad credit may not even qualify for some of the better credit cards that are available. Credit cards for these types of credit profiles typically carry higher APRs. For example, the average interest rate on a card for people with bad credit is 25.30% APR as of Jan. 15, 2020. In contrast, the national average is 17.30% APR.

See related: How long does it take to get a credit card?

How to avoid paying interest

While credit cards typically carry higher interest rates than mortgage, student, auto and personal loans, one of the benefits of having a credit card is that you can get away with never paying interest at all.

There are a few ways you can achieve this goal:

Pay your bill on time and in full

Credit card purchases typically get a grace period of at least 21 days between the end of each statement cycle and the due date for that period. If you pay off your balance in full by the due date every month, you’ll never pay a dime in interest.

Take advantage of 0% APR promotions

If you need to finance a large purchase or want to transfer a balance from another card, look for 0% APR credit cards and balance transfer credit cards that allow you to do it interest-free. Just keep in mind that many balance transfer cards charge a balance transfer fee, so the process isn’t always entirely free.

Avoid transactions with no grace period

Cash advances are rarely a good idea because they’re expensive – you’ll often pay a higher APR plus a cash advance fee – and there’s no grace period. Try to avoid them completely, if possible. Also, avoid transferring a balance from another card unless you have an introductory 0% APR promotion you can use.

As you learn more about how your credit card works and follow these tips, you’ll be able to better maximize the value of your card’s benefits while avoiding unnecessary interest charges.

Editorial Disclaimer

The editorial content on this page is based solely on the objective assessment of our writers and is not driven by advertising dollars. It has not been provided or commissioned by the credit card issuers. However, we may receive compensation when you click on links to products from our partners.

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Credit Card Rate Report Updated: March 25th, 2020
Business
14.34%
Airline
16.33%
Cash Back
16.55%
Reward
16.49%
Student
16.51%

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