Credit utilization
Credit utilization is the share of your credit card limits you are using, overall and on each card; lower is better for credit scores, and under 30% (ideally under 10%) is the usual guidance.
It is part of the "amounts owed" category, the second biggest factor in FICO scores after payment history. Most scores look only at your latest reported balances, so paying down helps as soon as the lower balance is reported.
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Related terms
Sources: myFICO: What's in my FICO scores