Factors That Shape a Credit Score — and How Much Each One Counts

This is the heaviest-weighted factor for good reason: lenders want to know whether you reliably pay what you owe. Every on-time payment reinforces a positive track record, while missed or late payments — especially those reported 30 or more days past due — can cause significant damage that lingers on your report for up to seven years.

The impact of a missed payment isn't uniform. A single 30-day late payment on an otherwise clean report tends to hurt more than the same delinquency on a file already showing past problems. Severity matters too: a 90-day late is more damaging than a 30-day late. Collections accounts and charge-offs fall under this category as well.

Credit utilisation is the ratio of your current revolving balances to your total revolving credit limits. If your combined credit card limits total $10,000 and you're carrying $3,000 in balances, your utilisation is 30%. Most credit guidance suggests keeping utilisation below 30%, with lower generally being better for your score.

Utilisation is calculated both overall and per card. Maxing out one card can hurt even if your other accounts have low balances. Because most card issuers report balances to bureaus monthly, this factor can change relatively quickly compared to others — paying down balances often produces a visible score change within one to two billing cycles.

Scoring models consider how long your oldest account has been open, how long your newest account has been open, and the average age of all accounts. Longer history generally favours your score because it gives lenders more data to assess your behaviour over time.

This is one reason closing an old credit card — even one you rarely use — can be counterproductive. Doing so can shorten your average account age and reduce your available credit (which also increases utilisation). If annual fees aren't a concern, keeping older accounts open and occasionally active is often a sound strategy. For a full look at common misconceptions around account closures, see our piece on credit score myths.

Lenders view borrowers more favourably when they've managed different types of credit responsibly. Scoring models typically distinguish between revolving credit (credit cards, lines of credit) and installment credit (auto loans, mortgages, student loans, personal loans). Having experience with both signals that you can handle varied financial obligations.

This factor carries less weight than the first two, and it's rarely worth taking on debt purely to diversify your credit mix. Think of it as a bonus factor: if you already have an installment loan alongside your credit cards, you may see a modest benefit. If you only have one type, don't rush to open another just for the mix.

When you apply for new credit, lenders perform a hard inquiry — a formal check of your credit report. Each hard inquiry can temporarily reduce your score by a few points, and multiple inquiries in a short window can compound this effect. The impact typically fades within 12 months, and inquiries fall off your report after two years.

There are important exceptions: rate-shopping for a mortgage, auto loan, or student loan within a short period (usually 14–45 days depending on the scoring model) is generally treated as a single inquiry. Checking your own score or report triggers only a soft inquiry, which has no scoring impact. Opening multiple new accounts rapidly also affects average account age, creating an overlap with the length-of-history factor.