Credit utilisation

What utilisation measures

Credit utilisation is the proportion of available revolving credit that a borrower is actually using. For a credit card with a £5,000 limit and a £1,000 balance, utilisation is 20%. It applies principally to revolving products such as credit cards and overdrafts, where the borrower has a set limit and can draw on it repeatedly, rather than to instalment loans with a fixed repayment schedule.

The figure can be read at the level of a single account or across all of a borrower's revolving facilities combined. Both views are informative: an individual card close to its limit tells one story, while a borrower who is heavily drawn across every available facility tells another, often more concerning, one.

Why lenders watch it

Utilisation is widely treated as a behavioural indicator of financial pressure. A borrower who consistently uses a large share of their available credit may be relying on it to manage everyday spending or to cover shortfalls, which can signal strain even when payments are still being met. Conversely, low and stable utilisation tends to indicate that credit is available as a buffer rather than being leaned on.

Because it reflects current behaviour rather than historical events, utilisation is a relatively responsive signal. It can move month to month and can therefore pick up emerging difficulty earlier than lagging indicators such as a missed payment or a default, which only appear once a problem has already crystallised.

• Rising utilisation across multiple facilities can be an early sign of financial difficulty
• Persistently maxed-out revolving credit is a stronger warning than a single high balance
• Low, stable utilisation suggests credit is a buffer rather than a crutch

Use in decisioning and monitoring

In lending decisions, utilisation feeds both creditworthiness and affordability assessment. At application, a lender can see a prospective borrower's utilisation through bureau data and, with consent, through Open Banking, which reveals how heavily existing facilities are used in real terms. High utilisation alongside other commitments may indicate limited headroom to take on further borrowing responsibly.

For existing customers, utilisation is a valuable monitoring metric. A sharp and sustained rise can prompt a lender to review a limit, reach out, or offer support before difficulty becomes entrenched. Under the FCA Consumer Duty and the CONC rules on persistent debt, lenders are expected to recognise signs of strain and act to prevent foreseeable harm, and utilisation trends are one of the clearer signals available for doing so.

Interpreting it fairly

Utilisation should be read with care rather than applied mechanically. A high balance in a single month may simply reflect a large planned purchase that the borrower will clear in full, which is very different from a balance that is permanently near the limit and only minimally repaid. The pattern over time, and whether the balance is cleared or merely serviced, matters more than any single snapshot.

For lenders, the practical lesson is to combine utilisation with other evidence, particularly verified income and the trajectory of balances, rather than relying on it in isolation. Used thoughtfully, it is a powerful early indicator that helps a lender lend responsibly and intervene supportively; used crudely, it risks misjudging borrowers who are using credit entirely sensibly.