Purchase APR is the interest rate charged on everyday purchases you don't pay off in full each month

Purchase APR is the yearly interest rate a credit card issuer charges on balances you carry from one month to the next. If you buy something for $1,000 and pay the full balance by the due date, you pay no interest — purchase APR does not apply. If you pay $600 and leave $400 unpaid, the issuer charges interest on that $400 at the purchase APR rate.

The rate varies by card and by cardholder. A card might advertise a purchase APR of 18% to 25%, but the exact rate you receive depends on your credit score, income, and the issuer's current pricing. You find your actual rate in the card's pricing document, called the Schumer Box, which every issuer must provide before you open the account.

Purchase APR is different from other APRs on the same card — balance transfer APR, cash advance APR, and penalty APR are usually higher and apply only to those specific transaction types. Understanding which APR applies to which transaction is the difference between a $50 interest charge and a $200 one.

Key Takeaways

  • Purchase APR only charges interest on balances you carry past the due date; paying in full by the statement due date avoids interest entirely.
  • Your actual purchase APR depends on your credit score and the issuer's pricing, and you can find it in the Schumer Box before you open the account.
  • Interest accrues daily on your unpaid balance, so the longer you carry a balance, the more you pay in total interest.
  • Introductory purchase APR offers (often 0% for 6 to 21 months) let you carry a balance interest-free during that period, but the regular purchase APR kicks in after.

How purchase APR is calculated on your monthly bill

Credit card issuers calculate interest using the daily periodic rate, which is your purchase APR divided by 365. Each day, the issuer applies this daily rate to your unpaid balance. At the end of the billing cycle, those daily charges add up to your monthly interest.

The balance used for this calculation is usually the average daily balance, which accounts for payments and new charges throughout the month. If you had a $1,000 balance on day 1, paid $500 on day 15, and made a $200 purchase on day 20, the issuer averages those balances across all 30 days to find the amount subject to interest.

Example: A card with a 20% purchase APR has a daily periodic rate of 0.0548% (20% ÷ 365). If your average daily balance is $2,000, you owe roughly $1.10 per day in interest, or about $33 for a 30-day month. That same balance at 25% APR costs about $41 per month.

The difference between introductory and regular purchase APR

Many cards offer a 0% introductory purchase APR for a set period — commonly 6, 12, 18, or 21 months — during which no interest accrues on new purchases. This period is useful if you plan to carry a balance temporarily, such as after a large purchase or during a balance transfer.

The introductory period applies only to purchases made during the offer window, not to purchases made after the offer ends. If your 0% offer runs for 12 months and you make a purchase in month 11, that purchase is subject to the regular purchase APR starting immediately — it does not get the 0% rate.

Once the introductory period ends, the regular purchase APR takes over. If you still have an unpaid balance, interest begins accruing at the full rate. This is why introductory offers are most useful if you have a concrete plan to pay the balance before the offer expires.

Why purchase APR matters less than you might think if you pay in full

If you pay your statement balance in full by the due date each month, your purchase APR is irrelevant — you will never pay interest, regardless of whether the rate is 15% or 30%. The card issuer offers a grace period, usually 21 to 25 days from the end of your billing cycle, during which no interest accrues on new purchases.

This grace period applies only if you paid your previous statement balance in full. If you carry a balance from month to month, the grace period disappears, and interest starts accruing on new purchases immediately. This is why carrying even a small balance can cost you more than you expect — new purchases begin accruing interest right away instead of getting the usual 21-day window.

For people who consistently pay in full, the purchase APR is a non-factor in choosing a card. Rewards rate, annual fee, and other features matter far more. For people who carry balances, purchase APR becomes one of the most important numbers on the card.

How to compare purchase APR across cards

The Schumer Box shows the purchase APR as a range — for example, "18% to 25% based on creditworthiness." To know what rate you will actually receive, you need to check your credit score before you apply. Issuers typically offer the lowest rates to people with credit scores above 750, and rates increase as credit scores drop.

When comparing cards, do not assume you will receive the lowest rate in the range. Use an online credit score tool to see your approximate score, then assume you will fall somewhere in the middle or lower end of the advertised range unless your credit is excellent. A card advertising 18% to 25% might cost you 22% if your score is around 700.

If you plan to carry a balance, purchase APR is worth comparing across cards. A 2% difference in APR costs you real money over time. On a $5,000 balance carried for a year, the difference between 20% and 22% APR is about $100 in extra interest. On a $10,000 balance, it is about $200.

What happens if you miss a payment or violate the card terms

Most cards include a penalty APR that is separate from the purchase APR and significantly higher — often 29.99% or higher. A penalty APR typically kicks in if you miss a payment by 60 days or more, or if you violate another card term (such as exceeding your credit limit).

Once a penalty APR is applied, it usually stays in place for at least six months, even if you catch up on payments. Some issuers will remove it earlier if you call and ask, but there is no may provide. This is why a single missed payment can cost you hundreds of dollars in extra interest over the following months.

Penalty APR applies to your entire balance, not just new purchases. If you have a $3,000 balance at 20% purchase APR and a penalty APR of 29.99% is triggered, that full $3,000 now costs you interest at the higher rate.

Strategies to minimize the cost of purchase APR

If you carry a balance, the fastest way to reduce interest is to pay more than the minimum payment. The minimum payment covers mostly interest and very little principal, so you stay in debt longer and pay more total interest. Paying double the minimum cuts your interest cost roughly in half and gets you out of debt faster.

A balance transfer to a card with a 0% introductory APR can also save money if you have high-interest debt on another card. Balance transfer APR is usually different from purchase APR and may have a transfer fee (typically 3% to 5% of the amount transferred). If you transfer a $5,000 balance at 24% APR to a 0% balance transfer offer, you save roughly $1,200 in interest over 12 months — even after paying a $150 transfer fee, you come out ahead.

Paying off the balance before the introductory period ends is critical. If you transfer $5,000 at 0% for 12 months but still owe $2,000 when month 13 arrives, that $2,000 suddenly costs you interest at the regular balance transfer APR, which is often 20% or higher.

Frequently Asked Questions

Does purchase APR apply to rewards I earn?

No. Rewards are separate from the purchase itself. You earn rewards on the full purchase amount, and purchase APR applies only to any unpaid balance you carry. If you buy $1,000 and earn 2% cash back, you get $20 in rewards regardless of whether you pay the balance in full or carry it forward.

Can a credit card issuer change my purchase APR after I open the account?

Yes, issuers can change your APR with 45 days' written notice, though they cannot raise your rate on existing balances unless you miss a payment by 60 days or more. New purchases after the rate change will use the new APR. You have the right to reject the increase and close the account, though you will still owe the existing balance at the old rate.

What is the difference between purchase APR and the card's interest rate?

They are the same thing. "Interest rate" and "APR" are used interchangeably for credit cards. APR stands for annual percentage rate and represents the yearly cost of borrowing. Some cards also have separate APRs for balance transfers, cash advances, and penalties, but "purchase APR" and "purchase interest rate" mean the same thing.

If I have a 0% introductory purchase APR, do I still pay interest on cash advances?

Yes. The 0% offer applies only to purchases, not to cash advances or balance transfers. Cash advances have their own APR (usually higher than purchase APR) and begin accruing interest immediately — there is no grace period for cash advances on any card. This is why using a credit card to withdraw cash is expensive.

How long does it take for interest to show up on my bill?

Interest accrues daily but appears on your statement at the end of your billing cycle. If you carry a balance from one month to the next, you will see the interest charge on your next statement. If you pay the full balance by the due date, no interest appears because the grace period protected you.