APR is the yearly cost of borrowing money on your credit card, shown as a percentage
APR stands for Annual Percentage Rate. It tells you what fraction of your credit card balance you will pay in interest charges over one year if you carry a balance month to month. If your card has a 20% APR and you owe $1,000, you would pay roughly $200 in interest over 12 months — though the actual amount depends on how much you pay down and when.
The key word is "annual." The APR is always stated as a yearly rate, even though credit card companies charge interest monthly. When your statement arrives, they divide the APR by 12 to get the monthly rate, then explore it to whatever balance you did not pay off.
APR matters because it is the single number that tells you how expensive it is to borrow on that particular card. Two cards with different APRs will cost you different amounts of money if you carry a balance. A card with 18% APR is cheaper to borrow on than a card with 24% APR.
Key Takeaways
- APR is the yearly interest rate charged on any balance you do not pay in full by the due date.
- Credit card companies charge interest monthly, dividing the APR by 12 to calculate what you owe each month.
- Different cards have different APRs, and your personal APR depends on your credit score and the card issuer's offer.
- If you pay your full balance every month, the APR does not cost you anything because no interest is charged.
- Introductory APR offers (0% for a set period) let you borrow without interest charges, but the regular APR kicks in after.
How your card's APR is set and why it varies
Credit card companies set a range of APRs they will offer, and where you land in that range depends on your credit score. Someone with a score above 750 might get 16% APR on a card, while someone with a score of 650 might get 24% APR on the same card. The issuer sees higher credit scores as lower risk, so they charge less.
The card's terms also matter. A rewards card often has a higher APR than a basic card from the same issuer, because the issuer is already spending money on rewards. A card with a long 0% introductory period usually has a higher regular APR once the intro period ends.
Your APR can also change after you open the account. Most cards have a variable APR, which means the rate can move up or down based on changes to the prime rate (a benchmark rate set by the Federal Reserve). When the Fed raises rates, your APR typically rises too. When the Fed cuts rates, your APR typically falls. Your card issuer must notify you before raising your APR, and they cannot raise it on existing balances unless you are more than 60 days late on a payment.
The difference between purchase APR, balance transfer APR, and cash advance APR
Most credit cards have more than one APR. The purchase APR is what you pay on regular purchases — clothes, groceries, gas. This is the APR you see advertised most often.
The balance transfer APR is what you pay if you move a balance from another card to this one. Many cards offer a 0% balance transfer APR for 6 to 21 months, which can save you money if you are paying off debt from another card. After the introductory period ends, the regular balance transfer APR kicks in — and it is often higher than the purchase APR on the same card.
The cash advance APR is what you pay if you use your card to withdraw cash from an ATM or get cash from a bank. This APR is almost always the highest of the three, often 3 to 5 percentage points above the purchase APR. Cash advances also start charging interest when ready — there is no grace period like there is for purchases.
What a 0% introductory APR actually means
A 0% introductory APR means you will not pay any interest on that type of transaction for a set period — usually 6 to 21 months, depending on the card and the offer. During that time, interest does not accrue on that balance, so every dollar you pay goes toward reducing what you owe.
The introductory period applies only to the transaction type specified. If a card offers 0% APR on balance transfers for 12 months, that does not mean new purchases are also 0%. New purchases will be charged the regular purchase APR from day one. Read the offer carefully to see which transactions get the 0% rate and for how long.
When the introductory period ends, the regular APR takes over. If you still have a balance, interest charges resume at the full rate. Some people use a 0% balance transfer offer to buy time to pay down debt without interest, then move the remaining balance to another 0% card before the first one's rate kicks in. This strategy works only if you can find another card willing to take the balance and if you stay disciplined about paying it down.
How APR affects what you actually pay each month
If you carry a balance, your monthly interest charge is calculated by taking your APR, dividing it by 12, and multiplying by your balance. A $5,000 balance on a card with 18% APR costs you roughly $75 in interest that month ($5,000 × 0.18 ÷ 12). The next month, if you paid $200 toward the balance, your new balance is $4,800, and interest is roughly $72.
This is why paying more than the minimum matters. The minimum payment is usually just enough to cover interest and a small amount of principal. If you pay only the minimum on a large balance, most of your payment goes to interest, and the balance shrinks very slowly. Paying extra principal reduces the balance faster, which means less interest charged the next month.
Use a credit card payoff calculator (available free from most card issuers' websites) to see how long it will take to pay off a specific balance at your card's APR, and how much total interest you will pay. Seeing the number often motivates people to pay faster.
Why APR does not matter if you pay in full each month
If you pay your entire statement balance by the due date every month, you will never pay a cent in interest, no matter how high the APR is. Credit cards come with a grace period — usually 21 to 25 days from the end of your billing cycle — during which no interest accrues on purchases. As long as you pay the full balance within that window, the APR is irrelevant to you.
This is why people who use credit cards strategically (for rewards, for fraud protection, for record-keeping) but pay in full each month do not worry about APR. The APR only costs you money if you carry a balance past the grace period.
How to compare APRs when choosing a card
If you plan to carry a balance, APR should be one of your main comparison points. Look at the purchase APR first, since that is what most of your charges will be. If you are considering a balance transfer, compare the balance transfer APR and the length of any introductory period.
Do not compare APRs across different issuers as if they are fixed. Your actual APR depends on your credit score. The APR advertised on a card's website is usually the lowest rate the issuer offers, reserved for people with excellent credit. If your score is lower, you may be offered a higher rate. Some issuers let you check what rate you would receive before you formally explore, without a hard inquiry on your credit report.
Also consider the card's other features. A card with a slightly higher APR but strong rewards or a long 0% introductory period might be better for your situation than a card with a lower APR but no other benefits. The best card depends on how you plan to use it.
Frequently Asked Questions
Can my APR change after I open the account?
Yes. Most credit cards have a variable APR that moves with the prime rate set by the Federal Reserve. Your issuer can also raise your APR if you are significantly late on a payment, though they must notify you first. They cannot raise the APR on balances you already owe unless you are more than 60 days late.
What is the difference between APR and interest rate?
APR and interest rate are often used interchangeably on credit cards. The APR is the interest rate expressed as a yearly percentage. On credit cards, there is no meaningful difference between the two terms — they refer to the same number.
Why do different cards have different APRs?
Card issuers set different APRs based on the card's features, the issuer's costs, and your creditworthiness. Rewards cards typically have higher APRs than basic cards. Your personal APR also depends on your credit score — the higher your score, the lower the APR you will be offered.
Does paying my balance in full avoid APR charges?
Yes. If you pay your entire statement balance by the due date, no interest is charged, and the APR does not cost you anything. The grace period (usually 21 to 25 days) gives you time to pay without interest accruing.
What happens to my balance when the 0% introductory APR ends?
When the introductory period ends, the regular APR for that transaction type takes over. If you still have a balance, interest charges resume at the full rate. This is why many people try to pay off a 0% balance before the period ends, or move the remaining balance to another 0% card.