Part of our guide to What Actually Moves Your Credit Score
Credit utilisation is the share of your available revolving credit that you are currently using. It carries substantial weight in every mainstream scoring model, and it is the only major factor that responds within a month.
Utilisation = balance ÷ credit limit. A $2,000 balance against a $10,000 limit is 20%. Scoring models look at this per card and across all your cards combined, and both matter.
Why it moves so quickly
Payment history accumulates — it is a record of years, and no single action rewrites it. Utilisation is different. It has no memory. Each month your issuer reports a current balance, and that figure replaces the previous one in the calculation.
A ratio of 70% reported in March does not linger in a score calculated in June. If the balance came down, the calculation simply uses the new number.
That property is what makes utilisation the first thing to look at when someone needs their score to improve before a specific date — a mortgage application, a refinance, a rental application.
Per card and overall
Both ratios are assessed, and people are often caught by the difference.
| Card A | Card B | Card C | Overall | |
|---|---|---|---|---|
| Limit | $8,000 | $5,000 | $2,000 | $15,000 |
| Balance | $400 | $300 | $1,900 | $2,600 |
| Utilisation | 5% | 6% | 95% | 17% |
Overall utilisation here is a comfortable 17%. Card C is at 95%, and that single account can weigh on the score despite the healthy total. Moving part of that balance to a card with room — or simply paying it down first — improves the picture without changing total debt at all.
If you are paying down several balances, the debt payoff calculator will order them by interest cost. For scoring purposes specifically, clearing the account closest to its limit does more than clearing the one with the highest rate.
The timing detail almost nobody is told
Your card issuer reports your balance to the bureaus roughly monthly, and it usually reports the balance as of the statement closing date — not the payment due date, and not the moment you pay.
The consequence is counter-intuitive. Someone who spends $4,000 a month on a $5,000-limit card and pays it in full every single month, never paying a penny of interest, may be reported at 80% utilisation every month. The score does not know the balance was cleared; it only sees what was reported.
Two ways to change that:
Pay before the statement closes. Make a payment a few days before the closing date so a smaller balance is what gets reported. You can still pay the rest by the due date.
Ask for a higher limit. A higher denominator lowers the ratio at the same spending. Be aware that some issuers treat a limit-increase request as a hard inquiry — ask first, and see hard vs soft inquiries.
Your closing date is on your statement. It is often nowhere near the due date.
What ratio to aim for
The commonly quoted figure is 30%, and it is worth being precise about what that number is and is not.
It is not a cliff. Nothing dramatic happens at 29% or 31%. Scoring models treat utilisation as a continuous variable: lower is better across the whole range, and the penalty steepens as you approach the limit.
It is not a target either. People with the highest scores typically report low single-digit utilisation, not 30%. The 30% figure is best read as "above this, you are giving away points unnecessarily" rather than as a goal to hit.
Zero is not optimal. Reporting 0% across every account gives the model no evidence of recent responsible use. A small reported balance — a few percent — generally scores at least as well as nothing at all. This is not a reason to carry debt: a balance reported on the closing date and paid in full by the due date costs no interest.
What counts, and what does not
Counts: credit cards and other revolving lines of credit, including home equity lines.
Does not count: instalment loans. Your mortgage, car loan and student loans are assessed on payment history and balance, but they do not enter the utilisation ratio. Paying down a car loan does not improve utilisation — only revolving balances do.
Handled inconsistently: charge cards with no preset limit. Different scoring models treat them differently, and some leave them out of the ratio.
The closing-a-card trap
Closing a credit card removes its limit from your total available credit. If the card had a $5,000 limit and no balance, closing it shrinks the denominator and raises your utilisation on the same debt.
Using the table above: close Card A, and total available credit falls from $15,000 to $7,000. The same $2,600 of debt now represents 37% utilisation rather than 17% — a materially worse position from an action that felt like tidying up.
Leaving a no-fee card open and lightly used avoids this entirely.
Related reading
- How to improve your credit score — where this sits in the order of operations
- What actually moves your credit score
- How credit card interest is calculated
- Credit score myths worth ignoring
- Credit card payoff calculator
This is general information, not financial advice — see our disclaimer.
Frequently asked questions
What is a good credit utilisation ratio?
Lower is better, with no threshold below which it stops helping. The widely repeated 30% figure is a rule of thumb for avoiding obvious harm, not a target — people with the highest scores typically report low single digits.
Is utilisation calculated per card or overall?
Both. Scoring models look at your overall ratio across all revolving accounts and at each card individually, so one maxed-out card can weigh on your score even when your total usage is modest.
Does utilisation have a memory?
No, and this is what makes it useful. Each month's figure replaces the last. A high ratio reported in March does not continue to affect a score calculated in June, provided the balance has come down.
When is my balance reported to the bureaus?
Usually on the statement closing date rather than the payment due date. Paying the balance down before the statement closes changes the figure that gets reported.
Does paying in full every month mean my utilisation is zero?
Not necessarily. If your balance is high on the closing date, that is what gets reported even if you pay it in full a week later. Paying in full protects you from interest, not from a high reported ratio.
Do charge cards count toward utilisation?
Cards with no preset spending limit are handled inconsistently between scoring models, and some exclude them from the ratio entirely. Revolving credit cards with a stated limit are the accounts that reliably count.
Sources
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