The short answer
INTEREST CHARGE ON PURCHASES is the finance charge your credit card issuer adds when you carry a balance past the due date. It is calculated from your purchase APR and your average daily balance, not a fee for any single purchase. Pay the statement balance in full each month and this line disappears.
Why it shows up like this
This line is interest, not a purchase. When you do not pay your full statement balance by the due date, your card issuer charges interest on the purchase portion of your balance. It appears as INTEREST CHARGE ON PURCHASES to separate it from interest on cash advances or balance transfers, which are billed at their own, usually higher, rates and shown on their own lines.
The amount comes from two things: your purchase APR and how much balance you carried, day by day, during the billing cycle. Most issuers use the average daily balance method: they add up your balance each day, divide by the number of days in the cycle, and apply a daily periodic rate (your APR divided by 365). That is why paying down a balance mid-cycle lowers the charge, and why the number rarely matches a simple percentage of your ending balance.
The most misunderstood part is the grace period. On purchases, most cards charge no interest if you pay the statement balance in full every month. But once you carry a balance, many cards suspend that grace period, so new purchases can start accruing interest immediately until you pay in full for a cycle or two and restore it. That is often why interest appears even after you have started paying more than the minimum.
Don’t recognize it? You might still
Interest is expected any time a balance rolls past the due date. Check whether last month was paid in full.
- You paid the minimum or a partial amount instead of the full statement balance.
- A previous carried balance suspended your grace period on new purchases.
- A payment posted after the due date, even by a day.
- A promotional 0% period ended and standard APR resumed.
What to do, in order
Confirm the math, restore your grace period, and lower future interest.
- Check your APR and balance method Your statement's interest-charge section lists the purchase APR and how the balance is figured. Confirm the charge lines up with the balance you carried.
- Pay the full statement balance to reset the grace period Paying the statement balance in full for a cycle or two typically restores interest-free purchases going forward.
- Ask about a rate reduction or a lower-APR option Issuers sometimes lower an APR on request for accounts in good standing; a balance-transfer or lower-rate card can also cut ongoing interest.
Quick questions
Why was I charged interest when I paid the minimum?
The minimum payment keeps the account current but leaves a balance, which accrues interest. Only paying the full statement balance by the due date avoids purchase interest under a normal grace period.
Can I get an interest charge reversed?
It is not an error if you carried a balance, but issuers will sometimes waive a single charge as a courtesy, especially for a first slip or a payment that posted just after the due date.
Part of a family
INTEREST CHARGE ON PURCHASES is one of the Chase statement codes lines — see the whole family decoded.
Independent reference — not affiliated with your credit card issuer. Billing names and policies change; verify with the merchant or your bank before acting.
Verified sources
Every claim on this page is checked against official sources — open them to confirm before you call your bank.
- CFPB — How is my credit card interest calculated? https://www.consumerfinance.gov/ask-cfpb/how-is-my-credit-card-interest-calculated-en-46/
- eCFR — Regulation Z (Truth in Lending), 12 CFR Part 1026 https://www.ecfr.gov/current/title-12/chapter-X/part-1026
Reviewed Sep 25, 2026 · high · About UnknownCharges