Credit utilization is the ratio of revolving credit used to total available; why does it matter?

• A. The ratio of all debt to income
• B. The frequency of credit inquiries
• C. The amount of cash you hold in savings
• D. The ratio of revolving credit used to total available; high utilization lowers your score

Answer: (D)

Credit utilization is the portion of your available revolving credit that you’re using. It matters because scoring models view high usage as a sign of potential risk: if you’re relying heavily on your credit lines, it can indicate trouble managing debt and paying balances. Because this ratio is part of how your credit score is calculated, keeping utilization low helps show you’re in control of borrowing and capable of repaying. A practical guideline is to keep total revolving utilization under 30%, with even better scores often seen when it’s under 10%. This concept specifically applies to revolving accounts like credit cards and lines of credit and is based on what lenders report to the credit bureaus, not on how much cash you have or your income. The other choices describe debt-to-income (a lender underwriting metric, not a direct score factor), how often you apply for new credit (inquiries), or cash savings (not a credit score component), which is why they don’t capture why utilization matters.