Key facts: Utilisation = card balances ÷ credit limits. Staying under ~30% reads as controlled; over 50% drags scores; 90%+ or maxed reads as distress. It's measured per card and overall, from balances on statement dates. It carries no memory — scores respond within a cycle or two of the balance changing.
Why lenders watch it
Utilisation is a live gauge of dependence on credit. Someone using 10% of their limits plainly has headroom; someone at 95% is one bad month from missing payments — statistically, and therefore in every scoring model. It's second only to payment history in most models' weighting, and it's the reason two people with identical clean histories can score very differently.
The thresholds in practice
Under 30% is the classic guideline; the relationship is really a slope, with under ~10% scoring best of all (though 0% across every account can score fractionally below "low but active" — models like evidence of managed use). Both lenses matter: £2,000 across four cards at 12% each reads fine; the same £2,000 maxing one £2,100 card trips the per-card alarm even though overall utilisation looks modest. Balance spreading is free score improvement.
Moving the number fast
Pay before the statement date — most issuers report statement balances, so a mid-cycle payment lowers what the agencies ever see, even for full-monthly payers. Keep old cards open — closing one deletes its limit and mechanically raises utilisation on everything else. Request limit increases on well-managed cards (without spending into them). Spread lumpy spending across cards near statement dates. Before a mortgage application, driving utilisation low for two or three cycles is one of the highest-yield moves available — see the full sequence in preparing your credit to borrow.
Where it fits in the bigger file
Utilisation is the fast lever, not the whole machine: payment history outweighs it, and defaults or recent search sprees can swamp it. But it's the rare factor that's both heavily weighted and instantly fixable — which is why it's the first thing to tune before any application, from a card upgrade to a mortgage.
Timing an application around it
If borrowing is on your horizon, two clean low-utilisation cycles first can shift your quoted rate. A broker can sanity-check your file's readiness before any hard search happens. Find a loan broker through Nesto — free, no obligation.
Frequently asked questions
Is 0% utilisation best?
Very low beats high every time, but models mildly prefer light active use over total dormancy — a small, promptly-cleared balance is the sweet spot.
Does utilisation matter if I pay in full monthly?
Yes — agencies see your statement balance. Paying down before the statement date lowers the reported figure.
Should I close cards I don't use?
Usually not — their limits pad your denominator. Keep them open with occasional small use, unless fees or temptation argue otherwise.
How fast can utilisation changes improve my score?
Within one or two statement cycles — it has no memory, unlike missed payments.