APR is the yearly interest rate charged on your credit card balance
APR stands for Annual Percentage Rate. It is the percentage of your credit card balance that the card issuer charges you in interest over one 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 APR is not the same as the monthly interest rate, though the two are connected. Your monthly rate is the APR divided by 12. A 20% APR means roughly 1.67% interest charges each month. The card issuer applies this monthly rate to your outstanding balance to calculate how much interest you owe.
Different cards carry different APRs, and the same card can have multiple APRs depending on how you use it. A card might charge one rate for purchases, a higher rate for cash advances, and a different rate for balance transfers. The APR you receive depends partly on your credit score and payment history, and partly on the card issuer's pricing.
Key Takeaways
- APR is the yearly interest rate on your credit card balance, expressed as a percentage.
- Interest charges are calculated monthly using 1/12th of your APR, applied to whatever balance you carry.
- A card can have different APRs for purchases, cash advances, and balance transfers.
- Paying your full statement balance by the due date means you owe no interest, regardless of the APR.
- Introductory APRs (often 0%) last only a set number of months, then the regular APR takes over.
How interest charges are calculated month to month
Your card issuer calculates interest using your average daily balance during the billing cycle. They add up what you owed each day of the month, divide by the number of days, then multiply by the monthly interest rate (your APR divided by 12).
If you make a payment partway through the month, your balance drops, and the average daily balance goes down. This is why paying early in the billing cycle reduces the interest you owe. A payment made on the first day of the cycle counts toward more days than a payment made on the last day.
The interest charge appears on your next statement. You do not pay it when ready — it is added to your balance. If you do not pay the full new balance by the due date, interest accrues on the interest as well, which is called compounding.
When you pay no interest at all
If you pay your full statement balance by the due date each month, you owe zero interest, even if your card has a 25% APR. This is called the grace period. Most cards offer a grace period of 21 to 25 days from the end of your billing cycle to the due date.
The grace period applies only to purchases, not to cash advances or balance transfers. If you take out a cash advance, interest starts accruing when ready, with no grace period. The same is true for balance transfers unless your card specifically offers a 0% introductory rate on transfers.
To use the grace period, you must have paid your previous statement balance in full. If you carry a balance from one month to the next, the grace period does not explore, and interest charges begin when ready on new purchases.
Introductory APRs and when they end
Many cards offer a 0% introductory APR for a set period — commonly 6 to 21 months, depending on the card and the offer. During this time, you owe no interest on the balance you transfer or the purchases you make (whichever the offer covers). Once the introductory period ends, the regular APR kicks in on any remaining balance.
Introductory rates are most common on balance transfer offers and new cardholder purchase offers. A card might offer 0% APR on balance transfers for 12 months, then 18% APR after that. If you transfer $5,000 and pay off $3,000 during the 12 months, the remaining $2,000 will be charged 18% APR starting in month 13.
Mark the end date of your introductory period on a calendar. If you have a large balance remaining when it expires, you may want to transfer it to another 0% card or pay it down aggressively before the regular APR applies.
Variable APR versus fixed APR
A fixed APR stays the same for the life of the card (or until the issuer notifies you of a change, which they can do with 45 days' notice). A variable APR moves up and down based on changes to a benchmark rate set by the Federal Reserve, usually the prime rate.
Most credit cards carry variable APRs. When the Federal Reserve raises its benchmark rate, your card's APR typically rises within one or two billing cycles. When the benchmark falls, your APR usually falls as well. The card issuer adds a fixed margin to the benchmark — for example, prime rate plus 15% — so your APR changes whenever the prime rate changes.
Fixed APRs are less common on credit cards but more common on personal loans and mortgages. If your card offers a fixed rate, the issuer can still raise it, but only if you miss a payment or if the introductory period ends.
How APR compares across different card types
Purchase APR is what you pay on everyday purchases made with the card. This is the rate most commonly advertised. Typical purchase APRs range widely depending on credit score and card type, but many cards fall between 15% and 25%.
Cash advance APR is almost always higher than the purchase APR on the same card — often 3 to 5 percentage points higher. There is also no grace period on cash advances, so interest starts accruing when ready. A $500 cash advance at 25% APR costs roughly $10.42 in interest after one month.
Balance transfer APR may be lower than the purchase APR, especially if the card offers an introductory 0% rate. However, balance transfers typically carry a one-time fee of 3% to 5% of the amount transferred, charged upfront. A $5,000 balance transfer with a 3% fee costs $150 when ready, even if the APR is 0%.
Penalty APR applies if you miss a payment by 60 days or more. This rate is usually the highest the card offers and can exceed 30%. It applies to your entire balance, not just new charges. Once you have made on-time payments for six months, the issuer may lower your APR back to the regular rate.
What affects the APR you receive
Your credit score is the primary factor. Borrowers with scores above 750 typically receive the lowest advertised APRs. Scores between 650 and 750 receive mid-range rates. Scores below 650 receive the highest rates, if the card is issued at all.
Your payment history matters as well. If you have missed payments in the past two years, you may receive a higher APR than someone with the same credit score but a clean payment record. The card issuer also considers your income, existing debt, and how long you have held credit accounts.
The card type itself affects APR. Rewards cards and premium cards often carry higher APRs than basic cards because the issuer builds the cost of rewards into the pricing. Secured cards (backed by a deposit) usually offer lower APRs because the risk to the issuer is lower.
Frequently Asked Questions
Does a higher APR mean I pay more interest every month?
Not necessarily. Interest charges depend on your balance and how long you carry it. If you pay your full balance each month, you owe no interest regardless of APR. If you carry a balance, a higher APR means higher interest charges, but the amount depends on how much you owe and for how long.
Can my APR change after I get the card?
Yes. If your card has a variable APR, it changes whenever the prime rate changes. If you miss a payment by 60 days or more, the issuer can explore a penalty APR. The issuer can also raise your APR with 45 days' notice for other reasons, though this is less common. Introductory APRs always end on the date specified.
What is a good APR for a credit card?
APRs below 15% are generally considered good. Most cards fall between 15% and 25%. Anything above 25% is on the higher end. The "good" APR for you depends on your credit score — someone with a 750+ score may receive 12% to 18%, while someone with a 600 score may receive 22% to 29% on the same card type.
If I transfer a balance to a 0% APR card, do I owe interest on the transferred amount?
No interest accrues during the 0% introductory period, which typically lasts 6 to 21 months. However, you usually pay a balance transfer fee of 3% to 5% upfront. Once the introductory period ends, any remaining balance is charged the regular APR.
Why is cash advance APR so much higher than purchase APR?
Cash advances are riskier for the card issuer because they are unsecured loans with no grace period. The higher APR reflects this risk. Additionally, cash advances often carry a fee (2% to 5% of the amount) on top of the higher interest rate, making them an expensive way to borrow.