Why utilisation matters so much
Amounts owed account for roughly 30% of a FICO score, and revolving utilisation is the dominant factor within it. Unlike payment history, it has no memory: it recalculates every month from the balances your issuers report. That makes it the fastest lever available for improving a score — changes can show up in 30 to 60 days.
Two ratios are scored
Overall utilisation across all revolving accounts, and utilisation on each individual card. A single card near its limit drags your score even if your overall ratio looks fine. If you are spreading balances, spread them evenly rather than maxing one.
Timing beats paying more
Issuers report the balance on the statement closing date. If you charge $3,000 a month and pay it in full after the statement closes, your report shows $3,000 outstanding — high utilisation despite carrying no debt at all. Paying down before the closing date, or making a mid-cycle payment, fixes this without costing a cent.
Three ways to lower the ratio
- Pay down balances — the direct route.
- Request a credit limit increase — often granted with a soft inquiry, and instantly effective.
- Keep old cards open — closing a card removes its limit from the calculation and can spike your ratio overnight.
Before a mortgage application
Utilisation is one of the few score factors you can move quickly, and mortgage pricing is tiered by score. Getting your ratio under 10% two months before applying can move you into a better rate band — worth thousands over the loan. Do not open new accounts in that window; the inquiries and reduced average account age work against you.