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.
The key word is "annual" — the APR is always stated as a yearly rate, even though interest compounds and is charged monthly. Credit card companies divide the APR by 12 to calculate what you owe each month. So a 20% APR becomes about 1.67% per month.
APR only matters if you carry a balance past your due date. If you pay your full statement balance by the deadline each month, you pay no interest, regardless of the APR. Many credit cards offer a grace period — usually 21 to 25 days from the end of your billing cycle — during which no interest accrues on purchases.
Key Takeaways
- APR is the yearly interest rate charged on balances you do not pay in full by the due date, and it varies by card and by your creditworthiness.
- Different types of transactions on the same card can have different APRs — purchases, cash advances, and balance transfers often carry separate rates.
- Introductory APR offers (often 0% for 6 to 21 months) apply only to specific transaction types and only if you meet the terms.
- Interest compounds monthly, so a higher APR costs significantly more the longer you carry a balance.
- Your APR can increase if you miss a payment or if the card issuer raises rates, though federal law caps how much and how quickly they can do so.
Why APR varies from card to card and person to person
Credit card companies set APR based on risk. A person with a strong credit history and high credit score typically receives a lower APR because the lender views them as less likely to default. Someone with a lower credit score or recent missed payments will see a higher APR on the same card product.
The card issuer also sets a range of APRs for each card type. A rewards card marketed to people with excellent credit might advertise "APR from 16% to 22%," meaning the lowest rate goes to the best applicants and the highest to those at the edge of approval. You will not know your exact APR until after you are approved.
Different cards from the same issuer carry different standard APRs. A basic card might start at 18%, while a premium card starts at 16%. Shopping around matters — a 4 percentage point difference on a $5,000 balance costs you roughly $200 per year in extra interest.
How different transaction types have different APRs on one card
A single credit card can have multiple APRs. Your purchase APR (the rate on everyday shopping) might be 19%, but your cash advance APR could be 25%, and a balance transfer APR might be 21%. This matters because interest starts accruing on cash advances immediately — there is no grace period — and at a higher rate.
Introductory APR offers almost always apply to only one transaction type. A card offering "0% APR for 12 months on balance transfers" does not give you 0% on new purchases made during those 12 months. Read the terms carefully to understand which transactions get the promotional rate and which use the regular APR.
Introductory APR offers and how they work
Many cards offer a temporary 0% APR for a set period — commonly 6, 12, 18, or 21 months — on balance transfers, purchases, or both. During this period, you pay no interest on the covered transactions, even if you carry a balance. This can save substantial money if you transfer an existing balance or make a large purchase you plan to pay off over time.
The catch is that the promotional rate expires. When it does, the regular APR kicks in on any remaining balance. If you have a $3,000 balance transfer on a 0% APR for 12 months and you have paid off only $1,500 by month 13, the remaining $1,500 suddenly starts accruing interest at the card's standard APR.
Introductory offers also usually require you to meet conditions. Missing a payment during the promotional period can end the offer immediately and apply the regular APR retroactively to the entire balance. Some offers also exclude certain types of transactions or require a minimum transfer amount.
How interest actually gets calculated on your balance
Credit card companies use one of two methods to calculate interest: the average daily balance method or the adjusted balance method. Most use average daily balance, which is more common and usually results in higher interest charges.
With average daily balance, the company adds up your balance for each day of the billing cycle, divides by the number of days, then multiplies by your monthly interest rate (APR divided by 12). If you made a large purchase on day 25 of a 30-day cycle, that purchase counts toward your average for only 6 days, so it accrues less interest than if you had made it on day 1.
This is why timing matters. A payment made early in your billing cycle reduces the average daily balance more than a payment made near the end. If you must carry a balance, paying as early as possible in the cycle saves money.
When your APR can increase and what limits apply
Card issuers can raise your APR, but federal law (the Credit Card Accountability Responsibility and Disclosure Act, or CARD Act) sets strict rules. They cannot increase your rate in the first year after you open the account. After that, they can raise rates, but they must give you 45 days' notice in writing, and the increase applies only to new charges, not to existing balances (with limited exceptions for variable-rate cards).
Missing a payment is the most common trigger for a rate increase. If you are 60 days late, the issuer can apply a "penalty APR," which is typically several percentage points higher than your regular rate. This penalty rate can apply to your entire balance, not just new charges. However, if you make on-time payments for six consecutive months after the late payment, the issuer must lower the rate back to the original APR.
Variable-rate APRs are tied to an index (usually the prime rate set by the Federal Reserve). When the index changes, your APR changes automatically. Fixed-rate APRs do not change with market conditions, though the issuer can still raise them with proper notice.
How to compare APRs when choosing a card
APR is one factor in choosing a card, but not the only one. If you plan to pay your balance in full each month, APR does not matter at all — a card with no annual fee and good rewards is a better choice than a low-APR card with no rewards. If you know you will carry a balance, APR becomes critical.
Compare the regular purchase APR, not just the introductory rate. An offer of 0% for 12 months looks attractive, but if the regular APR jumps to 24% after that, it may not be the best long-term choice. Look at the full range of APRs the card offers (purchase, balance transfer, cash advance) if you plan to use multiple transaction types.
Also consider the card's other costs: annual fees, late payment fees, and foreign transaction fees. A card with a 2% annual fee and a 16% APR might cost less overall than a no-fee card with a 20% APR if you carry a small balance, but the math flips if you carry a large balance for a long time.
Frequently Asked Questions
Does APR apply if I pay my full balance on time?
No. If you pay your entire statement balance by the due date, you owe no interest, regardless of the APR. The grace period (usually 21 to 25 days from the end of your billing cycle) protects you from interest charges on purchases as long as you pay in full.
What is the difference between APR and interest rate?
APR and interest rate are often used interchangeably for credit cards. APR includes the interest rate plus any fees charged by the lender, expressed as an annual percentage. For credit cards, the APR and the interest rate are usually the same thing.
Can I negotiate my APR with my credit card company?
Yes, especially if you have a good payment history and a decent credit score. Call the customer service number on your card and ask if they can lower your rate. They may offer a reduction, particularly if you mention you are considering switching to another card. There is no harm in asking.
What happens to my APR if I miss a payment?
If you are 60 days late, the issuer can apply a penalty APR, which is typically much higher than your regular rate and can apply to your entire balance. If you make six consecutive on-time payments after the late payment, the issuer must lower the rate back to the original APR.
Is a 0% APR offer worth it if there is an annual fee?
It depends on how much you plan to transfer or spend and how long the 0% period lasts. If you transfer $5,000 and the annual fee is $95, you save roughly $750 to $1,000 in interest over 12 months at a typical 18% to 20% APR, so the fee pays for itself. Calculate the interest you would pay at your current card's APR and compare it to the fee.