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 cost of borrowing money on your credit card, expressed as a percentage per year. If your card has a 20% APR and you carry a $1,000 balance for a full year without making payments, you will owe roughly $200 in interest charges on top of the original $1,000.

Credit card companies calculate interest daily, not yearly. They take your APR, divide it by 365, and apply that daily rate to your balance each day. This is why the actual interest you pay depends on how long you carry the balance and how much you owe each day.

Most credit cards have multiple APRs. You might have one rate for purchases, a different rate for balance transfers, and a higher rate for cash advances. The rate you see advertised is often a range — like 18% to 25% — because the exact rate you receive depends on your credit history and the card issuer's decision.

Key Takeaways

  • APR is the yearly interest rate charged on a credit card balance; the actual interest you pay depends on how much you owe and for how long.
  • Credit card companies calculate interest daily by dividing your APR by 365 and applying that daily rate to your current balance.
  • Most cards have different APRs for purchases, balance transfers, and cash advances; the rate you receive depends on your credit history.
  • Paying your full statement balance by the due date means you pay no interest, regardless of the APR.
  • A higher APR costs you significantly more money over time, so comparing rates between cards matters if you plan to carry a balance.

How APR affects what you actually pay

The difference between a 15% APR and a 25% APR is real money. On a $5,000 balance carried for one year, 15% APR costs you roughly $750 in interest, while 25% APR costs roughly $1,250. That $500 difference is money you do not get back.

The longer you carry a balance, the more interest compounds. If you make only minimum payments on a high-APR card, you may spend years paying off the original purchase while interest keeps growing. A $2,000 purchase at 22% APR, paid at a typical minimum payment of 2% of the balance, can take over four years to pay off and cost you nearly $1,000 in interest.

This is why paying your full statement balance each month is the most important step. If you pay the full amount by the due date, the APR does not matter — you pay zero interest. The APR only kicks in when you carry a balance from one month to the next.

Introductory APR offers and what happens after

Many credit cards offer a promotional APR — often 0% for a set period, usually 6 to 21 months. This applies to purchases, balance transfers, or both, depending on the card. During the promotional period, you pay no interest on that type of transaction, even if you carry a balance.

The catch is that the promotional rate expires. When it does, the regular APR takes over. If you still owe money at that point, interest charges jump immediately. A 0% introductory offer on a balance transfer is useful only if you can pay off the transferred balance before the promotional period ends.

Read the card's terms carefully to know exactly when the promotional period ends and what the regular APR will be. Some cards also charge a balance transfer fee — typically 3% to 5% of the amount transferred — upfront, which reduces the savings from the 0% rate.

Variable APR versus fixed APR

A fixed APR stays the same for the life of the card (though the card issuer can change it with 45 days' notice under federal law). A variable APR moves up or down based on a benchmark interest rate set by the Federal Reserve. When the Fed raises rates, your variable APR usually rises within one or two billing cycles.

Most credit cards carry variable APRs. This means your interest rate can increase even if you do nothing wrong. During periods when the Fed is raising rates, variable APR cards become more expensive to carry a balance on. Fixed APR cards protect you from this, but they are less common and may come with higher starting rates.

APR does not apply to all transactions

Purchases are not the only thing that can be charged interest. Cash advances — withdrawing money from an ATM using your credit card — typically carry a higher APR than purchases, often 25% to 30%, and start accruing interest immediately with no grace period. A cash advance also usually includes an upfront fee of 3% to 5% of the amount withdrawn.

Balance transfers to another card have their own APR, which may be lower than your purchase APR if you are moving debt from a high-rate card. However, balance transfers also charge a fee, typically 3% to 5%, added to the amount transferred.

Late fees and penalty APRs are separate. If you miss a payment by 30 days or more, the card issuer can raise your APR to a penalty rate, which can be 25% to 30% or higher. This penalty rate can apply to your entire balance, not just new purchases. Paying on time is the only way to avoid this.

How to compare APRs when choosing a card

If you plan to carry a balance, APR matters more than rewards or sign-up bonuses. A card offering 2% cash back but charging 24% APR costs you money if you carry a balance. A card with a lower APR and no rewards is cheaper if you are paying interest.

Look at the APR range the card issuer publishes. If you have good credit (typically a score of 670 or higher), you are more likely to receive the lower end of the range. If your credit is fair or poor, you will likely receive a higher rate within that range.

Consider whether a promotional 0% APR period matters to you. If you can pay off a balance transfer within the promotional window, a card with a strong 0% offer saves money. If you cannot, the regular APR after the promotion ends is what you will actually pay.

Frequently Asked Questions

What is the difference between APR and interest rate?

APR includes the interest rate plus any fees charged as part of borrowing. For credit cards, the terms are often used interchangeably because the main cost is the interest rate itself. The APR is what you should focus on when comparing cards.

Can a credit card company change my APR?

Yes. Card issuers can raise your APR with 45 days' notice, especially if you miss a payment or if you have a variable rate that moves with Federal Reserve changes. They cannot lower your rate without your permission, though you can call and ask for a lower rate if your credit has improved.

Does APR apply if I pay my balance in full each month?

No. If you pay your full statement balance by the due date, you pay no interest and the APR does not apply. This is called the grace period. Interest only charges when you carry a balance from one billing cycle to the next.

Why is cash advance APR higher than purchase APR?

Cash advances are riskier for card issuers because they are unsecured loans with no collateral. The higher rate reflects that risk. Additionally, cash advances start accruing interest immediately, with no grace period like purchases have.

What happens if I only make minimum payments?

Minimum payments cover mostly interest, not principal. On a high-APR card, you can spend years paying off a purchase while interest keeps growing. A $3,000 purchase at 20% APR with 2% minimum payments takes roughly five years to pay off and costs over $1,500 in interest.