How Credit Scores Work

 How Credit Scores Work

A credit score is a three-digit number that summarizes how risky you look as a borrower, based on your history of managing debt. Lenders use it to decide whether to approve you for a loan or credit card, what interest rate to offer, and sometimes even how much credit to extend. Landlords, insurers, and occasionally employers check it too. Despite how much weight it carries, most people have only a vague sense of what actually moves the number — which makes it easy to unintentionally hurt a score while trying to help it.

 Where the Number Comes From

Credit scores aren't tracked by a single central authority. They're calculated by scoring models — most commonly FICO and VantageScore — using data pulled from your credit reports at the three major credit bureaus: Equifax, Experian, and TransUnion. Because each bureau may have slightly different information on file (not every lender reports to all three), your score can vary depending on which bureau's data was used.

Scores typically range from 300 to 850. Generally speaking, anything above 740 is considered very good to excellent, 670–739 is good, 580–669 is fair, and below 580 is considered poor — though exact thresholds vary slightly by lender and scoring model.

The Five Factors That Determine Your Score

FICO, the most widely used scoring model, breaks your score down into five weighted categories. Understanding the weight of each one tells you where to focus your attention.

 1. Payment History (about 35%)

This is the single largest factor, and it's exactly what it sounds like: whether you've paid your bills on time. A single missed payment can drop your score noticeably, and the damage gets worse the longer a payment stays unpaid — accounts more than 30, 60, or 90 days late are reported at increasingly severe tiers. A payment that's 30 days late does less damage than one that's 90 days late, and severely delinquent accounts or collections can stay on your report for up to seven years.

This is also why payment history is the easiest factor to control with a simple habit: setting up autopay for at least the minimum payment on every account removes the risk of an accidental late payment derailing your score.

2. Credit Utilization (about 30%)

This measures how much of your available credit you're actually using, expressed as a percentage. If you have a $10,000 total credit limit across your cards and a $3,000 balance, your utilization is 30%.

Lower utilization generally signals lower risk. Many experts suggest staying under 30% utilization, and those aiming for excellent scores often keep it under 10%. What surprises people is that this factor is recalculated every billing cycle based on your reported balance — it isn't a permanent mark like a late payment, so it can improve quickly once balances come down.

3. Length of Credit History (about 15%)

This factor considers how long your credit accounts have been open — both the age of your oldest account and the average age across all accounts. A longer history generally helps your score because it gives lenders more data to assess your patterns.

This is part of why closing your oldest credit card, even one you don't use often, can quietly hurt your score: it shortens your average account age and reduces your total available credit, which can also push your utilization percentage higher.

 4. Credit Mix (about 10%)

Lenders like to see that you can responsibly manage different types of credit — revolving credit like credit cards, and installment credit like auto loans, student loans, or mortgages. This doesn't mean you should take out a loan you don't need just to diversify your mix; it's a smaller factor, and taking on unnecessary debt to influence it typically isn't worth the tradeoff.

5. New Credit (about 10%)

Opening several new accounts in a short period can temporarily lower your score, partly because it can look like financial distress and partly because each application typically triggers a hard inquiry, which has a small, short-term negative effect. A single new account or occasional inquiry isn't a major concern, but opening five cards in three months is a pattern that scoring models flag.

Hard Inquiries vs. Soft Inquiries

Not every credit check affects your score. A **hard inquiry** happens when you apply for new credit — a loan, credit card, or mortgage — and it can cause a small, temporary dip, usually recovering within a few months. A **soft inquiry** happens when you check your own score, or when a company checks your credit for pre-approved offers or background purposes; these don't affect your score at all. This means checking your own credit report regularly is completely safe and doesn't do any damage — a common misconception that keeps people from monitoring their credit as often as they should.

Common Myths Worth Clearing Up

**Myth: Checking your own score hurts it.** As covered above, this is a soft inquiry and has no effect.

**Myth: Carrying a balance and paying interest helps your score.** It doesn't. Paying your balance in full every month is both financially smarter and better for your utilization ratio. There's no credit-score benefit to carrying debt.

**Myth: Closing old, unused cards is a good idea.** Usually the opposite — it can shorten your credit history and reduce your available credit, both of which can lower your score.

**Myth: Income affects your credit score.** It doesn't directly. Credit scores measure how you manage credit, not how much you earn — though income does affect whether lenders approve you and for how much, separately from the score itself.

How to Actually Improve a Score

**Pay every bill on time, every time.** Given that this is the single largest factor, automating payments is the highest-leverage habit available.

**Bring utilization down.** Paying down balances — or, for some people, requesting a credit limit increase without increasing spending — lowers the percentage thatscoring models see.

**Leave old accounts open.** Unless there's a compelling reason (an annual fee on a card you never use, for instance), keeping old accounts open preserves your credit history length.

**Space out new credit applications.** Apply for new credit only when you actually need it, and avoid clustering several applications close together.

**Check your credit reports for errors.** Mistakes on credit reports are more common than most people expect, and disputing an inaccurate late payment or account can meaningfully improve a score. You're entitled to a free copy of your report from each bureau on a regular basis.

 The Bigger Picture

A credit score isn't a measure of your worth or even your overall financial health — it's a narrow prediction of how likely you are to repay debt on time, based on a specific set of historical patterns. Understanding the five factors that build it turns an opaque, anxiety-inducing number into something manageable: pay on time, keep balances low relative to your limits, and let your accounts age. Those three habits alone account for the vast majority of what determines a strong score, and they compound quietly in the background once they're in place.