Statement balance
A credit card's statement balance is what you owed when the billing cycle closed; paying it in full by the due date avoids interest on purchases, while the current balance also includes charges since then.
The statement balance is usually what the issuer reports to the credit bureaus, so paying before the statement closes lowers the utilization on your credit report.
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Related terms
Sources: CFPB: Regulation Z, 12 CFR 1026.7