How Credit Scores Actually Work

FICO, the company behind the most widely used credit scoring model in the United States, publishes the general weighting of the factors that make up a FICO Score. Understanding these categories is the fastest way to demystify what actually moves your score.

• Payment history (about 35%) — whether you've paid past credit accounts on time.
• Amounts owed (about 30%) — how much of your available credit you're using, often called credit utilization.
• Length of credit history (about 15%) — how long your accounts have been open.
• New credit (about 10%) — how many new accounts and credit inquiries you've had recently.
• Credit mix (about 10%) — the variety of credit types you manage, such as credit cards and installment loans.

Payment history and utilization matter most

Because payment history and amounts owed together account for roughly two-thirds of a FICO Score, the two highest-leverage habits are straightforward: pay at least the minimum on every account by the due date, and keep credit card balances low relative to your credit limits. Neither requires a high income — both are about consistency.

You're entitled to see your own reports for free

Under federal law, consumers are entitled to a free copy of their credit report from each of the three nationwide credit reporting agencies through AnnualCreditReport.com — the only site authorized by federal law for this purpose. Reviewing your report periodically for errors is one of the more overlooked but effective ways to protect your score, since reporting mistakes do happen and can drag a score down until corrected.

A credit score isn't a judgment of character — it's a statistical summary of borrowing behavior over time. Building a strong score is less about any single dramatic action and more about a long run of small, consistent ones.