How does a credit score decide what you pay to borrow?

Hook

Why and how does a credit score decide what you pay to borrow? It's a three-digit number built by a formula most people never see, yet it shapes your mortgage rate, your car loan, even some apartment applications. So what's actually inside it?

Origin

Before scores, a loan officer read your file and made a judgment call. In 1989, the company Fair Isaac launched the FICO score, a formula that turns your credit history into one number. Base FICO scores run from 300 to 850, and FICO's 2026 report put the national average at 714.

Reports

The score is built from your credit reports. Three big bureaus, Equifax, Experian and TransUnion, collect what lenders send them: your accounts, balances, and whether you paid on time. Because each bureau's file can differ, you can have three slightly different scores on the same day.

Recipe

Here's the recipe, according to FICO. Payment history is about thirty five percent. Amounts owed, about thirty. Length of credit history, fifteen. New credit and your mix of account types, about ten percent each. Notice what's missing: your income, your job, your age and where you live aren't part of the score.

Pay

Payment history matters most for a reason: the best predictor of whether you'll pay is whether you have paid. A payment is usually reported late once it's thirty days past due, and most late payments can stay on your report for seven years.

Owed

Amounts owed is mostly about how much of your available credit you're using. Owe two thousand dollars on a card with a ten thousand dollar limit, and you're using twenty percent. Lower is generally better, and many experts suggest staying under thirty percent.

New

Scores are changing, too. In 2026, Fannie Mae and Freddie Mac began accepting VantageScore 4.0 for mortgages, with FICO 10T approved for later. Both are newer models that can weigh trended data. And you can check your credit reports free every week at AnnualCreditReport.com.

Close

So a credit score is a formula built on your credit history, and paying on time and keeping balances low move it the most. ThatsWhyHow.