How Credit Utilization Affects Your Score (and the Ratio to Aim For)

Credit utilization is the ratio of what you owe on revolving accounts — mainly credit cards — to the total credit limit available to you. Owe $2,000 across cards with a combined $10,000 limit and your utilization is 20%. It sounds like a minor bookkeeping detail. In FICO's scoring model it is the second-biggest factor after payment history, worth about 30% of your score.

Why utilization carries so much weight

Payment history tells a lender whether you pay your bills. Utilization tells them something payment history can't: how close you are to your limits right now, before anything has gone wrong. A borrower running balances near their limits looks more likely to miss a payment soon, even with a spotless history so far. Scoring models weight it heavily because it is one of the earliest warning signs available.

The curve isn't a straight line

A common assumption is that utilization scores linearly — that going from 50% to 30% and from 10% to 0% should help about the same amount. They don't. Scoring models reward the biggest jumps at the high end and flatten out near zero:

• Above 75% utilization: consistently the steepest penalty.
• 30%–50%: still a real drag, and the range most people don't realize hurts.
• 10%–30%: a comfortable middle zone for most scoring models.
• Under 10%: close to the best you can do — but 0% is not necessarily better than 1–9%. A small reported balance shows the account is active and being used responsibly.

Per-card utilization matters too

Scoring models look at your overall utilization across all cards, but also at each card individually. Maxing out one card while others sit untouched can ding your score even if the blended ratio looks fine — spreading balances more evenly, or paying down the card that's closest to its limit first, usually helps more than an equivalent paydown spread thin.

It's calculated on a snapshot, not in real time

Card issuers typically report your balance to the bureaus once per billing cycle, usually at (or near) the statement closing date — not the due date. If you carry a $1,800 balance into your statement close and pay it off in full two weeks later, the $1,800 is still what gets reported for that cycle. If a big purchase is about to push your utilization up right before your statement closes, paying it down before the closing date — not just before the due date — is what actually moves the number the bureaus see.

Two practical levers

There are really only two ways to lower utilization: pay down what you owe, or increase your available limit. A limit increase request usually triggers a soft inquiry (no score impact) if you ask through your existing card's app or site — worth checking before assuming it will cost you points. Closing a card, on the other hand, removes its limit from the total and can push utilization up, which is worth weighing before you cancel anything you're not actively using.