APR is the yearly interest rate a credit card company charges when you carry a balance

APR stands for Annual Percentage Rate. It is the percentage of your outstanding balance that the card issuer charges you in interest over the course of a year. If your card has a 20% APR and you carry a $1,000 balance for a full year without making payments, you would owe roughly $200 in interest charges on top of the original $1,000.

The key word is "annual" — the rate is quoted per year, but interest compounds and is charged monthly. Most card issuers divide the APR by 12 and apply that monthly rate to your balance. So a 20% APR becomes about 1.67% per month. The interest you owe each month depends on your current balance, not the balance from the start of the year.

APR only applies when you carry a balance — money you do not pay off by the due date. If you pay your full statement balance each month, you typically owe no interest, regardless of the APR. This is called the grace period, and it is a standard feature on most credit cards.

Key Takeaways

  • APR is charged only on balances you do not pay off by the due date; paying in full each month means you owe no interest.
  • Different transactions on the same card can have different APRs — purchases, balance transfers, and cash advances often carry separate rates.
  • Introductory APRs (often 0%) last for a limited time, usually three to twelve months, then jump to the regular rate.
  • Your card's APR depends on your credit score and the card's terms; people with lower credit scores typically receive higher APRs.
  • Interest compounds monthly, so the longer you carry a balance, the more you owe in total, even if you stop using the card.

How APR is calculated and charged to your account

Card issuers use one of several methods to calculate the interest you owe each month. The most common is the average daily balance method. The issuer adds up your balance for each day of the billing cycle, divides by the number of days, then multiplies by the monthly interest rate (APR divided by 12).

If you make a payment mid-cycle, your balance drops, and the average daily balance goes down — which means less interest that month. If you make a large purchase late in the cycle, it counts for fewer days and has less impact on that month's interest charge. This is why the timing of payments and purchases matters.

Interest is posted to your account monthly, usually on your statement date. Once posted, that interest becomes part of your new balance. If you do not pay it off, you will owe interest on the interest next month — this is called compounding. Over time, compounding makes a balance grow faster than you might expect.

Different APRs for different types of transactions

A single credit card can have multiple APRs. Your purchase APR applies to regular purchases like groceries or gas. A balance transfer APR applies if you move debt from another card to this one. A cash advance APR applies if you use the card to withdraw cash from an ATM or get cash at a store.

Cash advance APR is almost always higher than purchase APR — sometimes 5 to 10 percentage points higher. Cash advances also typically start accruing interest immediately, with no grace period, and may include an upfront fee (usually 3% to 5% of the amount withdrawn). Balance transfer APR can be lower than purchase APR, especially during an introductory period, but balance transfers usually carry a one-time fee of 3% to 5%.

When you make a payment, the card issuer applies it to whichever balance has the highest APR first (by law). This means if you have both a purchase balance and a cash advance balance, your payment goes toward the cash advance first, which is good — but the purchase balance keeps accruing interest at its rate. Understanding which balance carries which rate helps you decide where to focus your payments.

Introductory APR offers and how they work

Many credit cards offer a promotional or introductory APR — often 0% — for a set period. This period typically lasts three to twelve months, depending on the card and the offer. During that time, you owe no interest on the covered transaction type, even if you carry a balance.

Introductory offers usually apply to either purchases or balance transfers, not both. A card might offer 0% APR on purchases for six months but charge a regular APR on balance transfers immediately. Another card might offer 0% on balance transfers for twelve months but charge regular APR on new purchases. Read the terms carefully to know which transactions are covered.

When the introductory period ends, the regular APR kicks in on any remaining balance. If you have $2,000 left after a six-month 0% offer expires, you will suddenly start paying interest on that $2,000 at the card's regular rate. For this reason, introductory offers work best if you plan to pay off the balance before the period ends, or if you can transfer the remaining balance to another 0% card.

How your credit score affects the APR you receive

The APR you are offered depends partly on your credit score and credit history. Card issuers use your score to assess risk — a higher score suggests you are less likely to miss payments, so issuers offer lower APRs. A lower score suggests higher risk, so issuers charge higher APRs to compensate.

The difference can be substantial. Someone with a credit score above 750 might receive a 15% APR on a card, while someone with a score below 650 might receive 25% or higher on the same card product. Over time, this gap compounds. A $5,000 balance at 15% APR costs roughly $750 per year in interest; the same balance at 25% costs roughly $1,250 per year.

Your APR can also change after you open the account. Card issuers can raise your APR if you miss a payment or if your credit score drops significantly. They must give you notice (usually 45 days) before increasing your rate, and the increase typically applies only to new purchases, not existing balances — though this varies by card and issuer.

Variable vs. fixed APR

Most credit card APRs are variable, meaning they can change over time. Variable APRs are tied to a benchmark rate set by the Federal Reserve, usually the prime rate. When the Fed raises or lowers rates, card issuers typically adjust their APRs within a few billing cycles.

A few cards offer fixed APR, which does not change based on Fed rate changes. Fixed APR is rare on credit cards and usually appears only on specific promotional offers or specialized cards. Even a fixed APR can increase if you miss a payment or if the issuer changes its terms (with notice).

The difference matters most when interest rates are rising. If you carry a balance during a period when the Fed is raising rates, a variable APR will climb, and your monthly interest charges will grow even if your balance stays the same. This is one reason financial advisors recommend paying off credit card balances rather than carrying them long-term.

What happens when you carry a balance and how interest adds up

Carrying a balance means paying interest every month until the balance is gone. The longer you carry it, the more you pay in total interest — even if you stop using the card and make regular payments.

Here is a concrete example: suppose you have a $3,000 balance at 20% APR and you make $100 payments each month. Your first month's interest is roughly $50 (one-twelfth of 20% of $3,000). After your $100 payment, your new balance is $2,950. Next month's interest is roughly $49. This continues for about 35 months, and you end up paying roughly $1,500 in total interest — half the original balance again.

If you had paid $200 per month instead, you would pay off the balance in about 17 months and owe roughly $700 in interest. The difference between $100 and $200 per month is $800 in interest savings. This is why paying more than the minimum, or paying off the balance faster, is so important.

Frequently Asked Questions

Is APR the same as interest rate?

APR and interest rate are often used interchangeably, but APR is more precise. APR includes the interest rate plus any fees charged by the card issuer, expressed as a yearly percentage. On most credit cards, the APR and the interest rate are effectively the same because credit cards do not charge ongoing fees the way some loans do.

What is a good APR for a credit card?

APR varies widely based on your credit score and the card type. As of recent years, average APRs range from about 16% to 25%, but cards for people with excellent credit can be as low as 12% to 15%, while cards for people with poor credit can exceed 30%. An introductory 0% APR offer is considered excellent if you can pay off the balance before it expires.

Can I negotiate my credit card APR?

You can ask your card issuer to lower your APR, especially if you have a good payment history or if your credit score has improved since you opened the account. Issuers are not required to lower it, but some will, particularly if you threaten to close the account or transfer your balance elsewhere. The worst they can say is no.

Does paying only the minimum payment hurt my credit score?

Paying the minimum on time does not hurt your credit score — it actually helps, because it shows you are making payments. However, carrying a high balance relative to your credit limit (high utilization) does hurt your score, even if you pay on time. Paying more than the minimum lowers your balance faster and improves your utilization ratio.

What happens to my APR if I miss a payment?

If you miss a payment, your card issuer can raise your APR, often to a penalty rate that is higher than your regular APR. This penalty rate typically applies to new purchases and existing balances. You can usually get the rate lowered again if you make on-time payments for six to twelve months, depending on the issuer's policy.