The Annual Percentage Rate is the yearly cost of borrowing on your card

The Annual Percentage Rate (APR) is the interest rate your card issuer charges you each year, expressed as a percentage of your balance. 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 APR is the single number that tells you how much it costs to borrow money using that card.

Your card issuer is required by law to disclose the APR in your card agreement and on your monthly statement. The rate you receive depends on your credit score, payment history, and the card's terms — different cardholders can have different APRs on the same card product. A card advertised at 18% APR might charge you 15% or 24% depending on your creditworthiness when you apply.

The APR only applies when you carry a balance — money you do not pay off by the statement due date. If you pay your full statement balance each month, no interest accrues and the APR does not cost you anything, regardless of how high it is.

Key Takeaways

  • APR is the yearly interest rate charged on balances you do not pay in full, and different cardholders can have different APRs on the same card.
  • Interest accrues daily on your outstanding balance, not just once a year, so a 20% APR costs roughly 0.055% per day.
  • Most cards have different APRs for purchases, balance transfers, and cash advances, and the purchase APR does not apply to the other two.
  • Promotional APRs (0% for 6 months, for example) expire on a specific date, after which the regular APR takes over immediately.
  • Paying only the minimum does not stop interest from accruing; the balance shrinks slowly while interest charges keep adding up.

How daily interest accrual works on your balance

Credit card issuers do not charge interest once a year. Instead, they calculate interest daily using a method called the daily periodic rate. This is the APR divided by 365 (or sometimes 360, depending on the issuer). A 20% APR becomes roughly 0.055% per day. Each day, the issuer multiplies your current balance by that daily rate and adds the charge to what you owe.

This means the interest you pay depends on how long you carry the balance. If you have a $1,000 balance and pay it off after 30 days at a 20% APR, you will owe roughly $16 in interest, not the full $200. The longer the balance sits, the more interest accumulates — and because interest is added to your balance each day, you start earning interest on the interest itself, a process called compounding.

Your monthly statement shows the total interest charged during that billing cycle. This number reflects the daily accrual across all the days your balance was outstanding. If you made a payment mid-month, the balance dropped and the daily charges for the remaining days were lower.

Different APRs for different types of transactions

Most cards have at least two different APRs: one for purchases and one for cash advances. Some cards add a third for balance transfers. These rates are separate — the purchase APR does not apply to a cash advance, and vice versa. Your card agreement lists each one.

The purchase APR is what you pay on regular spending — groceries, gas, online shopping. The cash advance APR is typically much higher (often 5 to 10 percentage points above the purchase rate) and applies when you withdraw cash from an ATM using your card or get a cash advance at a bank. Cash advances also start accruing interest immediately; there is no grace period like there usually is for purchases.

A balance transfer APR applies if you move a balance from another card onto this one. Some cards offer a promotional rate (0% for 12 months, for example) on balance transfers to make the move attractive. Once the promotional period ends, the regular balance transfer APR takes over. If the card has no separate balance transfer APR listed, the purchase APR applies to transferred balances.

Promotional APRs and when they expire

Many cards offer a promotional APR — typically 0% for a set period — to new cardholders or for specific transactions like balance transfers. A card might advertise "0% APR for 12 months on balance transfers." This means any balance you transfer during the promotional period will not accrue interest for 12 months from the date of the transfer.

The promotional period has a hard end date. On the day it expires, the regular APR takes over immediately. If you have a $3,000 balance transfer with 0% APR for 12 months and you have not paid it off by month 13, interest starts accruing at the card's regular balance transfer APR from day one of month 13. There is no grace period between the promotional rate and the regular rate.

Promotional APRs apply only to the transaction type specified. A 0% APR on balance transfers does not apply to new purchases made on the card. Those purchases accrue interest at the regular purchase APR from the statement due date onward. Your card statement will show the promotional balance separately from new purchases so you can track which balance is under which rate.

How your APR affects the minimum payment trap

The minimum payment your card issuer calculates each month is usually just enough to cover the interest accrued plus a tiny fraction of the principal (the original amount you borrowed). At a high APR, most of your minimum payment goes toward interest, not toward reducing what you owe.

If you have a $5,000 balance at 22% APR and pay only the minimum each month, you might pay $150 per month, but roughly $90 of that goes to interest and only $60 reduces the balance. The next month, interest accrues on the remaining $4,940, and the cycle repeats. It can take years to pay off the balance if you stick to the minimum, and you will pay thousands in interest.

The higher your APR, the more dramatic this effect becomes. A 28% APR on the same $5,000 balance means even more of each minimum payment covers interest rather than principal. This is why paying more than the minimum — or paying in full — matters so much. Every dollar above the minimum goes directly toward reducing the balance and the interest you will owe in the future.

Variable APRs and when they change

Some cards have a variable APR, which means the rate can change over time. Variable rates are tied to an index, usually the prime rate published by the Federal Reserve. When the prime rate moves, your APR moves with it, typically within 30 to 45 days. Your card agreement explains how the rate is calculated and how often it can change.

Fixed APRs do not change based on market conditions, but issuers can still raise a fixed rate under certain circumstances. If you miss a payment by 60 days or more, the issuer can apply a penalty APR, which is a higher rate reserved for accounts in serious delinquency. Penalty APRs can be 5 to 10 percentage points higher than your regular rate. Once you make on-time payments for six months in a row, the issuer must consider lowering the penalty rate back to your regular APR, though they are not required to do so immediately.

During periods when the Federal Reserve raises interest rates, variable APRs tend to climb. During rate-cutting periods, they tend to fall. If you have a variable-rate card, your monthly statement will show your current APR and note if it has changed since the previous month.

Comparing APRs across different cards

APR is one factor in choosing a card, but not the only one. A card with a 18% APR and a $95 annual fee might cost you more over time than a card with a 22% APR and no annual fee, depending on how you use it. If you pay your balance in full each month, the APR does not matter at all — the annual fee is the only cost.

If you do carry a balance, a lower APR saves you money directly. The difference between 18% and 24% on a $2,000 balance carried for six months is roughly $60 in interest. Over a year, it is roughly $120. For people who regularly carry balances, a lower APR card is worth seeking out, especially if your credit score qualifies you for better rates.

Some cards offer a 0% APR promotional period for new cardholders (typically 6 to 21 months on purchases). If you have an existing balance on another card and can transfer it to a 0% card before the promotional period ends, you can pause interest accrual while you pay down the principal. This is only useful if you actually pay down the balance during the promotional period — once it expires, interest resumes at the regular rate.

What happens to your APR if you miss a payment

Missing a payment can trigger a penalty APR, but only if you are late by a certain number of days. Most issuers do not apply a penalty until you are 60 days past due. A payment that is 30 days late will show on your credit report and may result in a late fee, but the APR usually stays the same.

Once you hit 60 days late, the issuer can apply a penalty APR to your account. This rate is significantly higher than your regular APR and applies to your entire balance, not just new charges. The penalty APR stays in place until you demonstrate a pattern of on-time payments — typically six consecutive months of paying by the due date. Even then, the issuer is not required to remove the penalty rate immediately; they must only consider doing so.

If you receive a notice that a penalty APR has been applied, read it carefully. It will state the new rate, the date it takes effect, and the conditions under which it might be removed. Some issuers allow you to call and request removal of the penalty rate if the late payment was an isolated incident, though they are under no obligation to grant the request.

Frequently Asked Questions

Does the APR apply if I pay my full balance by the due date?

No. If you pay the entire statement balance by the due date, no interest accrues and the APR does not cost you anything. The grace period (usually 21 to 25 days from the end of your billing cycle) protects you from interest on purchases as long as you pay in full. This grace period does not apply to cash advances or, on some cards, balance transfers.

Can my APR go down if my credit score improves?

Issuers are not required to lower your APR based on improved credit, but you can request a review. Call your card issuer and ask if they will lower your rate given your on-time payment history. Some issuers will negotiate, especially if you have been a customer for a while. If they refuse, you can always apply for a different card with a better rate and transfer your balance.

What is the difference between APR and interest rate?

APR and interest rate are often used interchangeably on credit cards, but APR is technically the broader term — it includes the interest rate plus any fees charged as part of the borrowing cost. On most credit cards, the APR is essentially the interest rate because there are no additional fees built into the rate itself. On loans, APR may include origination fees or other costs.

If I transfer a balance, does my new card's APR apply right away?

The new card's APR applies to the transferred balance according to the terms of the promotional offer. If the card offers 0% APR for 12 months on balance transfers, that rate applies from the date the transfer posts, not from the date you request it. New purchases made on the card accrue interest at the regular purchase APR from the statement due date onward, even during a promotional period.

How do I know what my current APR is?

Your current APR is listed on your monthly statement, usually near the top or in a section labeled "Interest Rates and Fees." If you have multiple APRs (purchase, balance transfer, cash advance), each one is shown separately. You can also log into your online account or call the customer service number on the back of your card to ask for your current rate.