Credit utilisation is one of the most influential — and most misunderstood — factors in UK credit scoring. Two people with identical repayment histories can end up with meaningfully different scores purely because of how much of their available credit they're using at any given time.
What credit utilisation actually means
Credit utilisation is the percentage of your available revolving credit (mainly credit cards and overdrafts) that you're currently using. It's calculated as:
For example, if you have a credit card with a £2,000 limit and a current balance of £600, your utilisation on that card is 30%. Lenders and scoring models generally look at this both per card and across all your revolving credit combined.
When is utilisation actually measured?
This catches many people out: utilisation is typically assessed based on your statement balance — the balance recorded on the date your statement is generated — not your balance at the moment you check your app. Paying off your card in full before the statement date, rather than just before the payment due date, is what actually lowers the utilisation figure reported to the credit reference agencies.
Why utilisation matters so much
High utilisation can suggest to lenders that you're relying heavily on credit relative to what's available to you, which is statistically associated with higher risk of future repayment difficulty — regardless of whether you've ever actually missed a payment. This is why utilisation is weighted heavily in most scoring models, second only to payment history for many lenders.
What counts as "good" utilisation
| Utilisation level | General impact |
|---|---|
| Under 10% | Generally viewed very favourably |
| 10–30% | Generally considered healthy by most lenders |
| 30–50% | May start to weigh on your score, particularly if sustained |
| Above 50% | Commonly viewed as a risk signal, especially close to 100% |
These are general guides rather than hard rules — different lenders and scoring models apply their own thresholds, but the direction of travel (lower is better) holds consistently.
Practical ways to lower your utilisation
- Pay down balances before the statement date, not just the payment due date, so a lower figure is actually reported
- Make more than one payment a month on cards you use frequently, keeping the running balance lower throughout the cycle
- Ask for a credit limit increase on an existing card you manage well, which lowers your utilisation percentage even if your spending stays the same — though be aware some providers run a hard search for this
- Spread spending across multiple cards rather than concentrating it on one near its limit, if you hold more than one
- Avoid closing old cards with high limits purely to "tidy up" your accounts — this can reduce total available credit and push utilisation up, even if your spending is unchanged
Does utilisation matter on loans and mortgages too?
Utilisation as a specific metric mainly applies to revolving credit — cards and overdrafts — rather than fixed-term loans or mortgages, which are assessed more directly through balance reduction over the agreed term. However, high utilisation elsewhere on your file can still affect a lender's overall view when assessing a new loan or mortgage application.
For related reading, see our guides on The Pros and Cons of Credit-Builder Cards and How UK Lenders Calculate Affordability and DTI.
The bottom line
Credit utilisation is calculated as your balance divided by your limit, typically measured at your statement date, and keeping it comfortably below 30% — ideally lower — is one of the most effective, fastest-acting ways to strengthen your credit score without needing to open any new accounts.