Credit utilization is roughly 30% of a FICO score and the only major factor that can be changed in a matter of weeks. It is also routinely misunderstood, almost always in the same way.
What it measures
Utilization is your reported revolving credit balances divided by your total revolving credit limits, expressed as a percentage. $2,000 of balances against $10,000 of limits is 20%.
Only revolving accounts count. Mortgages, auto loans and student loans are installment debt and are evaluated separately.
The reported balance, not the current one
This is the part that trips people up. Issuers report to the credit bureaus once a month, usually shortly after the statement closes, and they typically report the statement balance.
So someone who charges $4,500 a month on a $5,000 limit and pays it in full every month still shows 90% utilization, because that is what was on the statement when the issuer reported. Perfect payment behavior, poor-looking utilization.
Overall and per-card
Scoring models look at both your aggregate utilization and the utilization on each individual card. One maxed card can weigh on your score even when your overall figure looks fine.
| Card | Balance | Limit | Utilization |
|---|---|---|---|
| Card A | $4,700 | $5,000 | 94% |
| Card B | $0 | $10,000 | 0% |
| Card C | $300 | $8,000 | 4% |
| Overall | $5,000 | $23,000 | 22% |
The 22% overall looks reasonable. The 94% on Card A does not, and models notice it. Spreading that balance across the three cards would improve the picture without changing the total debt at all.
How low is low enough
There is no cliff. The relationship is continuous — lower is better all the way down. The commonly cited 30% figure is a reasonable target, not a threshold that triggers anything.
- Under 10% is where people with the highest scores typically sit.
- Under 30% is a sensible goal for most people.
- Above 50% begins to weigh noticeably.
- Above 90% is among the more damaging things in an otherwise clean file.
One nuance: reporting 0% across every card is very slightly worse than reporting a small positive balance on one, because the models want to see credit being used. The difference is a few points and not worth engineering.
It has no memory
Unlike payment history, utilization is a snapshot. Once a lower balance is reported, the previous month's figure stops counting. Six months of high utilization followed by one month of low utilization scores as low utilization.
This is why utilization is the right lever when you need a score improvement in weeks rather than years — before a mortgage application, for instance.
How to lower it
- Pay before the statement closes, not just before the due date.
- Ask for a credit limit increase, which raises the denominator. Ask whether it involves a hard inquiry first.
- Spread balances across cards rather than concentrating on one.
- Do not close unused cards — closing removes their limits and raises utilization immediately.
- Make a second payment mid-cycle in months when spending is heavy.
That fourth point is the most common self-inflicted wound in credit scoring. Closing a no-fee card you never use costs you its limit and gains you nothing.
