APR is the yearly cost of borrowing money on your card, shown as a percentage

APR stands for annual percentage rate. It is the interest rate a credit card issuer charges you when you carry a balance — money you do not pay off in full by the due date. If your card has a 20% APR and you owe $1,000 at the end of a month, the issuer charges you roughly $200 per year in interest on that balance, though the actual monthly charge is smaller and compounds.

The APR you see advertised is rarely the rate you will pay. Most cards have a range — say, 18% to 27% — and the issuer assigns you a specific rate within that range based on your credit score, income, and credit history. A higher credit score usually means a lower APR. A lower score means a higher one, sometimes at the top of the range or even higher for certain card types.

APR matters because it is the single biggest cost of carrying a balance. A $5,000 balance at 20% APR costs you roughly $100 per month in interest alone if you make no payments. That $100 goes to the issuer, not toward reducing what you owe.

Key Takeaways

  • Your card's APR is the yearly interest rate charged on balances you do not pay in full, and most cards show a range rather than a single rate.
  • The actual APR you receive depends on your credit score and history, not just the card type.
  • Interest compounds daily, so a higher balance and longer repayment period cost significantly more than the APR percentage alone suggests.
  • Most cards have different APRs for purchases, balance transfers, and cash advances, and some offer a 0% introductory period for new cardholders.
  • Paying your full statement balance by the due date means you owe no interest, regardless of the APR.

How daily interest compounds and adds up over time

Credit card issuers calculate interest daily, not yearly. They take your balance, divide the APR by 365, and multiply by your balance each day. This daily charge is called the daily periodic rate. Over a month, these daily charges add up to your monthly interest bill.

The longer you carry a balance, the more interest you pay because interest compounds — you pay interest on the interest from previous days. A $5,000 balance at 20% APR costs roughly $83 in interest the first month if you make no payments. The next month, your balance is now $5,083, so interest is calculated on the larger amount. By month six, you have paid over $500 in interest and still owe close to $5,500.

This is why paying down a balance quickly matters far more than the APR number alone suggests. Paying $500 extra in month two cuts your total interest cost in half compared to making minimum payments.

Purchase APR, balance transfer APR, and cash advance APR are usually different

Most cards charge different rates for different types of transactions. A purchase APR applies to everyday spending. A balance transfer APR applies when you move debt from another card to this one. A cash advance APR applies when you withdraw cash using your card at an ATM or through a cash advance.

Cash advance APR is almost always the highest of the three — often 3 to 5 percentage points above the purchase APR. Balance transfer APR sometimes sits between the two, though some cards offer a promotional 0% balance transfer APR for 6 to 21 months. Purchase APR is typically the lowest.

Your card's disclosure document, called the Schumer Box, lists all three rates and any promotional rates. You can find this on the issuer's website or request it before you open the card.

Introductory 0% APR periods and when they end

Many cards offer a 0% introductory APR for a set period — commonly 6 to 21 months — on purchases, balance transfers, or both. During this period, you owe no interest on that type of transaction, even if you carry a balance. Once the introductory period ends, the regular APR kicks in on any remaining balance.

The length of the introductory period varies widely. Cards aimed at people with good credit often offer longer periods (12 to 21 months), while cards for fair credit may offer 6 to 12 months. Some cards offer 0% on purchases only, others on balance transfers only, and some on both.

If you have a balance when the introductory period ends, interest begins accruing when ready on the remaining amount at the regular APR. A $3,000 balance at the end of a 12-month 0% period suddenly costs you $50 per month in interest if your regular APR is 20%.

Variable APR versus fixed APR and how rates change

Most credit cards have a variable APR, meaning the rate can change over time. The issuer ties the rate to a benchmark called the prime rate, which moves when the Federal Reserve changes interest rates. When the prime rate goes up, your APR goes up. When it goes down, your APR goes down.

A few cards offer a fixed APR, which does not change based on market conditions. Fixed APR cards are rare and usually come with other trade-offs, such as higher annual fees or lower rewards. Even a fixed APR can change if you miss a payment or violate your card agreement, though the issuer must notify you before the change takes effect.

Variable APR changes are not sudden. The issuer must give you at least 21 days' notice before a rate increase takes effect. You can reject the increase and close the card, though you will still owe the balance at the old rate.

Penalty APR and when it applies

A penalty APR is a higher rate the issuer charges if you miss a payment by 60 days or more. This rate can be 5 to 10 percentage points higher than your regular APR and applies to your entire balance, not just future charges. Some cards charge a penalty APR after just one missed payment; others wait until you are 60 days late.

The issuer must tell you the penalty APR in your card agreement and must notify you before it takes effect. You can sometimes get the penalty APR removed by calling the issuer and asking, especially if you have a good payment history and the late payment was a one-time mistake. Once removed, it usually does not explore again unless you miss another payment.

Penalty APR is one of the most expensive consequences of missing a payment. A single 60-day late payment can raise your APR from 18% to 28% on a $5,000 balance, costing you an extra $50 per month in interest.

How to avoid paying interest and compare APRs between cards

The simplest way to avoid interest is to pay your full statement balance by the due date each month. The statement balance is the total of all charges posted to your account during the billing cycle. Paying this amount in full means you owe no interest, regardless of your APR. This is true even if you make new charges after you pay — those charges appear on the next statement.

If you cannot pay the full balance, paying as much as you can reduces the interest you owe. A $2,000 balance at 20% APR costs roughly $33 per month in interest. Paying $500 extra reduces the balance to $1,500 and cuts next month's interest to about $25.

When comparing cards, look at the APR range in the Schumer Box, not just the advertised rate. A card advertising "18% APR" might actually charge you 24% or 27% depending on your credit. Also compare any introductory rates and how long they last. A card with a 20% regular APR but a 12-month 0% introductory period on balance transfers may cost less than a card with a 19% APR if you plan to transfer a balance.

Frequently Asked Questions

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

No. If you pay your full statement balance by the due date, you owe no interest regardless of the APR. The APR only applies to balances you carry past the due date. This is called the grace period — the time between the end of your billing cycle and your payment due date, usually 21 to 25 days.

Why did my APR increase even though I pay on time?

If your APR is variable, it can increase when the Federal Reserve raises interest rates, which affects the prime rate your card is tied to. You will receive notice at least 21 days before the increase takes effect. If the increase happened without notice, contact your issuer to ask why.

Can I negotiate a lower APR with my card issuer?

Yes. If you have a good payment history and your credit score has improved since you opened the card, you can call the issuer and ask for a lower rate. They may reduce it, especially if you threaten to close the card or transfer your balance elsewhere. There is no harm in asking, and the worst they can say is no.

What is the difference between APR and interest rate?

APR includes the interest rate plus any fees the issuer charges for borrowing, expressed as a yearly percentage. For credit cards, the APR and interest rate are usually the same because card issuers do not charge separate borrowing fees the way lenders do. The APR is what matters for comparing cards.

How long does it take to pay off a balance if I only make minimum payments?

It depends on the balance and APR, but typically years. A $5,000 balance at 20% APR with a 2% minimum payment takes roughly 10 years to pay off and costs over $5,000 in interest — doubling the original debt. Your card statement shows an estimate of how long payoff will take if you make only minimum payments.