How credit scores work (and how to improve yours)

Your credit score is a three-digit number, usually from 300 to 850, that lenders use to estimate how likely you are to repay borrowed money. It quietly shapes a lot: whether you are approved for a loan, the interest rate you are offered, and sometimes even your insurance premiums or apartment application. A higher score can save you tens of thousands of dollars over a lifetime of borrowing, so it is worth understanding what actually drives it.

The five factors (FICO model)

The most common score, FICO, is built from five ingredients, each weighted differently:

• Payment history — 35%. The single biggest factor. Do you pay on time? A history of on-time payments builds your score; late payments, collections, and defaults hurt it badly.
• Amounts owed / credit utilization — 30%. How much of your available credit you are using. Using a small fraction of your limits is good; maxing out cards is a major drag.
• Length of credit history — 15%. How long your accounts have been open. Older is better, which is why closing your oldest card can backfire.
• Credit mix — 10%. Having a variety of credit types (cards, an installment loan) helps modestly.
• New credit — 10%. Opening many accounts in a short window looks risky and can ding your score temporarily.

The two levers that matter most

Because payment history and utilization together make up 65% of your score, they are where your attention should go.

Never miss a payment. Even one 30-day-late mark can drop a good score noticeably and lingers for years. Automate at least the minimum payment on every account so a busy month never costs you.

Keep utilization low. A widely cited target is to use under 30% of each card's limit, and under 10% is even better. If you have a $10,000 limit, try to keep the reported balance under $3,000. Paying your card down before the statement closes (not just before the due date) lowers the balance that gets reported.

Common myths

• "Checking my own score hurts it." False. Checking your own credit is a "soft inquiry" and never affects your score. Only a lender's "hard inquiry" for a new application has a small, temporary effect.
• "Carrying a balance helps my score." False, and expensive. You do not need to pay interest to build credit. Pay in full every month; the on-time payment is what counts.
• "Closing old cards helps." Usually the opposite — it can shorten your history and raise your utilization by removing available credit.

Practical steps to raise your score

1. Set every bill to autopay at least the minimum, so you never miss a due date.
2. Pay balances down and keep utilization low — ideally under 10–30%.
3. Keep old accounts open to preserve your history and available credit.
4. Only apply for new credit when you genuinely need it.
5. Check your credit reports for errors at AnnualCreditReport.com, the free official source, and dispute mistakes.

Why it pays off

A better score means a lower interest rate, and a lower rate compounds into real money. Drop a mortgage rate by even half a percent and the lifetime savings are substantial — plug both rates into our loan calculator and compare the total interest to see it for yourself. Good credit is not about a bragging number; it is about paying less for everything you borrow.

Educational information only, not credit or financial advice. Scoring models and factors can vary by provider.