Does credit utilization affect your credit score?

Where it fits among the factors

• Payment history: about 35% of a FICO score.
• Amounts owed: about 30%. Utilization on revolving accounts is the key part, along with balances on loans.
• Length of credit history: about 15%.
• New credit: about 10%.
• Credit mix: about 10%.

These are general weights across the population. FICO says the importance can differ from one person to another, depending on what is in the file. A person with few accounts may feel a change in balances more sharply than someone with many older accounts.

Why lenders care about it

A card balance tells a lender how much of your available credit you are relying upon. Research on credit risk shows that people using most of their limits are more likely to miss payments in the future, so scoring models treat a high ratio as a sign of risk. This is true even when all your payments are on time, and even if you pay in full each month, if the reported balance looks high.

The models look at the total across all revolving accounts and at each card separately. They also consider how many of your cards carry balances. One card at 95% can matter, even when the overall ratio looks moderate.

How big the effect can be

There is no fixed formula, and FICO does not publish one. What we can say is that utilization often produces among the largest short term score changes people see, since balances can change within one billing cycle. Someone at 90% who pays down to 10% might see a much larger change than someone moving from 20% to 10%.

Remember the limits, though. A low ratio cannot cancel a recent late payment, a charge off or a thin file. The score reflects the whole report at that moment, so we cannot tell you what a certain paydown will produce on yours.

What to do about it

• Pay before the closing date: the reported figure is generally what counts.
• Pay the fullest cards first: this helps with the per card ratio, unless you prefer tackling your highest interest rate.
• Ask about higher limits: this can lower the ratio if your spending stays flat.
• Keep old cards open: their limits stay in your total.
• Check your report: a missing limit may make a ratio look higher than it really is.

Some people use a personal loan to consolidate card debt. Because loans are not part of revolving utilization, your ratio may fall. Read the fees first, and do not run the cards back up.

What does not change it

Your income is not part of a credit score, and neither are your savings or your debit card use. Carrying a balance on purpose does not help either. Asking for your own report does not change your score. A balance paid in full is still reported if it was on the statement, so what matters most is timing rather than whether you pay interest.

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