The interest section can explain why a balance generated a charge even when you made a payment. The statement and card agreement are the best sources for the exact calculation.
Identify the balance category
Look for separate purchase, cash-advance, and balance-transfer balances. Each may have a different APR and promotional terms.
Understand daily balance methods
Some issuers apply a daily periodic rate to balances over the billing cycle. New transactions, payments, and credits can affect the balance used in the calculation.
Look for grace-period information
If you expected no purchase interest, check whether the prior statement balance was paid in full and whether the account qualified for a grace period. Cash advances usually follow different rules.
When the amount seems wrong
Compare the APR, dates, balances, and calculation notes. Ask the issuer for an explanation and raise a formal billing dispute when appropriate.
Key takeaway
Review your own card agreement and latest statement for the rules that apply to your account. If something does not look right, contact the issuer through an official channel and keep a record of the response.
Educational information only. This article is not individualized financial, legal, or tax advice.