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Purchase APR is the annual percentage rate charged when you carry a balance on purchases made with a credit card. It's the cost of borrowing money from your card issuer, expressed as a yearly rate but applied to your daily balance.
When you pay your full statement balance by the due date, you typically avoid purchase APR altogether. But if you carry a balance forward to the next billing cycle, the card issuer applies the APR to the amount you owe.
Credit card companies don't simply multiply your balance by the APR once a year. Instead, they calculate daily periodic rates by dividing your APR by 365 (or sometimes 360). Each day, interest accrues on your outstanding balance at this daily rate. At the end of your billing cycle, these daily charges are summed into your finance charge.
Example: If your APR is 18% and your average daily balance is $1,000, the daily periodic rate is roughly 0.049%. Over a 30-day cycle, you'd owe approximately $14.70 in interest.
The card issuer reports this interest on your next statement, and it gets added to what you owe.
Your specific purchase APR depends on several factors:
| Factor | How It Works |
|---|---|
| Credit score | Higher credit scores typically qualify for lower APRs; lower scores face higher rates |
| Card type | Premium cards may offer lower APRs than standard options |
| Prime rate | Card APRs are often tied to the federal prime rate, which fluctuates |
| Card issuer | Different banks set different APR ranges for their products |
| Promotional periods | Some cards offer 0% APR for a limited time on new purchases or transfers |
You won't always know your exact APR until you apply and are approved. Issuers provide a range before approval (for example, "15% to 25% APR") and your actual rate depends on the factors above.
Fixed APR stays the same for as long as you hold the card. Even if market rates change, your APR remains locked in.
Variable APR moves with the prime rate. When the Federal Reserve raises or lowers rates, your APR adjusts accordingly—usually 30 days after the change. Most credit cards use variable APR.
Neither type is inherently "better"—it depends on whether you expect rates to rise or fall and your tolerance for payment uncertainty.
Credit cards can have different APRs for different types of transactions:
A single card might have a 16% purchase APR, a 0% balance transfer APR (for a set period), and a 25% cash advance APR. Always check your card agreement to understand which rate applies to which transaction.
Purchase APR becomes relevant only when you carry a balance. If you pay in full each month, the APR doesn't affect you—there's no interest charge to calculate.
However, if you expect to carry a balance, even temporarily, a lower purchase APR saves you money. Every percentage point matters over time, especially on larger balances or longer payoff periods.
Some people strategically use introductory 0% APR offers on purchases to avoid interest charges during a fixed period (typically 6–21 months, depending on the card). The trade-off: once the promotional period ends, the regular purchase APR kicks in.
Purchase APR is straightforward in concept but varies widely between cardholders and issuers. Your actual rate depends on your creditworthiness, the card you choose, and market conditions. Understanding how it's calculated helps you estimate the true cost of carrying a balance and decide whether a lower-APR card or a promotional offer makes sense for your situation.
