Question

What is credit utilisation and why does it matter?

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Answer

Credit utilisation is the proportion of your available credit that you are actually using. It is one of the most influential factors in credit scoring, and one of the easiest to change quickly.

How it is calculated. Total balances divided by total credit limits, expressed as a percentage. Balances of £2,000 against limits of £10,000 gives 20% utilisation.

It is measured both overall and per card, and a single card near its limit can matter even if your overall figure is low.

Why lenders care. High utilisation suggests reliance on credit and reduced financial headroom, which correlates with default risk. Someone using 90% of their available credit has little slack if something goes wrong; someone at 10% does.

The commonly cited guidance is to stay below 30%, with lower generally better. Note that this figure is a rule of thumb rather than a published threshold — scoring models are proprietary, and the relationship is continuous rather than a cliff at 30%.

The timing point people miss. Utilisation is calculated from the balance reported to credit reference agencies, which is typically the statement balance — not the balance after you pay. So someone who spends heavily and clears the card in full every month can still show high utilisation, despite never paying a penny of interest.

If this matters — for instance before a mortgage application — paying down before the statement date rather than after reports a lower figure.

What improves it:

Paying down balances, most effectively on the card closest to its limit.

Requesting a limit increase, which lowers utilisation immediately without changing your spending. This usually involves a check, so avoid it immediately before an application.

Not closing unused cards. This is counterintuitive — closing a card removes its limit from the denominator and raises utilisation. It can also shorten average account age.

Spreading balances rather than concentrating on one card.

It updates monthly, so improvements show relatively quickly compared with most credit factors.

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