Your credit score comes from a mathematical formula that weighs your borrowing and payment history

A credit score is a three-digit number — usually between 300 and 850 — that lenders use to predict whether you will repay money they lend you. The number is calculated by a formula that looks at five categories of information from your credit report: payment history, amounts you owe, length of credit history, new credit inquiries, and credit mix. You do not do anything to "get" a score — it is generated automatically once you have borrowed money or opened a credit account. The three major credit bureaus (Equifax, Experian, and TransUnion) each maintain their own version of your credit report and calculate their own score, so you may have three slightly different scores.

The score itself is not created by the bureaus. Instead, the bureaus sell your credit report data to scoring companies like FICO and VantageScore, which apply their own formulas to produce a score. FICO scores are the most widely used by lenders, but VantageScore and other models exist. Your score changes over time as new information is added to your credit report — typically within 30 to 45 days of a transaction or payment.

Key Takeaways

  • Your credit score is built automatically once you open a credit account or borrow money; you do not need to do anything to start the process.
  • Payment history makes up 35 percent of your FICO score, so missed or late payments damage your score more than any other single factor.
  • The three credit bureaus each maintain separate reports and scores, so checking all three gives you a complete picture of how lenders see you.
  • You can view your credit report for free once per year from each bureau through AnnualCreditReport.com, which is the only federally authorized source.

What information goes into your credit report

Your credit report is a record of every credit account you have opened and how you have managed it. This includes credit cards, car loans, mortgages, student loans, and even some utility or phone accounts if they report to the bureaus. For each account, the report shows the date you opened it, your credit limit or loan amount, your current balance, and your payment history — whether you paid on time, late, or not at all.

The report also includes hard inquiries, which are requests from lenders when you apply for credit. These stay on your report for two years but only affect your score for about three to six months. Public records like bankruptcies, tax liens, and court judgments also appear on your credit report if they exist, though older negative items eventually fall off — most negative information disappears after seven years, and bankruptcies after seven to ten years depending on the type.

Information that does not appear on your credit report includes your income, employment history, savings, investments, or criminal record. Lenders may ask for some of this information when you apply for a loan, but it does not factor into your credit score itself.

How the five factors are weighted in your score

FICO, which produces the score most lenders use, breaks down your score into five categories with different weights. Payment history accounts for 35 percent of your score — this is whether you paid your bills on time. Amounts owed (also called credit utilization) accounts for 30 percent — this is how much of your available credit you are currently using. Length of credit history accounts for 15 percent — this rewards you for having accounts open for a longer time. New credit accounts for 10 percent — this reflects recent applications and new accounts. Credit mix accounts for the final 10 percent — this means having different types of credit (cards, loans, mortgages) rather than only one type.

VantageScore, a competing model, weights these factors differently and may produce a different number than FICO, though the general direction is usually the same. Some lenders use industry-specific scores — for example, auto lenders may use a score that weights auto loan payment history more heavily. This is why your score may vary depending on which lender is checking it and which scoring model they use.

Why your score changes over time

Your credit score is not static. It recalculates whenever new information is added to your credit report. If you make a payment, that payment is typically reported to the bureaus within 30 to 45 days, and your score may shift up or down depending on what the payment was and what your other accounts look like. If you open a new credit card, your score usually drops slightly because you have a new hard inquiry and a new account with zero history. If you pay down a credit card balance, your score typically rises because your credit utilization goes down.

Large changes in your score usually come from major events: a missed payment, a collection account, a bankruptcy filing, or paying off a large loan. Small changes happen constantly as accounts age, balances shift, and new information is reported. This is why checking your score once a month or once a quarter gives you a better sense of the trend than checking it once and expecting it to stay the same.

Where to view your credit report and score

AnnualCreditReport.com is the only federally authorized website where you can view your credit report for free. You are may have access to to one free report per year from each of the three bureaus — Equifax, Experian, and TransUnion. You can request all three at once or space them out throughout the year. The report itself is free, but the score is not always included; some bureaus charge a small fee if you want the score along with the report.

Many credit card companies and banks now offer free credit scores to their customers as a benefit. These scores are usually updated monthly and may use FICO or VantageScore depending on the provider. Credit monitoring services like Credit Karma offer free scores and reports but make money by showing you credit offers. These services are legitimate and free to use, though the score they show may differ slightly from the score a lender sees because different models are used.

Avoid websites that claim to offer a "free credit score" but require a credit card to sign up or charge you after a trial period. The legitimate free sources listed above do not require payment upfront.

How to improve your credit score

Because payment history is 35 percent of your score, the single most effective way to improve it is to pay all bills on time, every time. Set up automatic payments or calendar reminders if you struggle to remember due dates. If you have missed payments in the past, the damage fades over time — a missed payment from five years ago affects your score far less than one from last month.

The second most impactful step is to lower your credit utilization — the percentage of your available credit that you are currently using. If you have a credit card with a $5,000 limit and a $4,500 balance, your utilization is 90 percent, which hurts your score. Paying the balance down to $1,500 (30 percent utilization) will improve your score, even if you do not pay it off completely. Lenders generally prefer to see utilization below 30 percent.

Avoid closing old credit cards, even if you do not use them. The length of your credit history matters, and closing an account can shorten your average account age. Instead, keep old cards open and use them occasionally to show activity. Do not apply for multiple credit cards or loans in a short period, as each application creates a hard inquiry that temporarily lowers your score.

What does not affect your credit score

Your income, employment history, and savings do not appear on your credit report and do not affect your score. Lenders may ask about these things when you apply for a loan, but they are separate from your credit score. Your age, race, gender, marital status, and location also do not factor into your score. Utility bills, rent payments, and insurance premiums typically do not report to the credit bureaus unless you miss a payment and it goes to a collection agency.

Checking your own credit report or score does not hurt your score — this is called a soft inquiry and does not appear to lenders. Only hard inquiries (when a lender checks your credit because you applied for something) count against you. Paying off a loan or credit card in full does not hurt your score, even though it removes an active account from your report.

Frequently Asked Questions

Can I have a credit score if I have never borrowed money?

No. A credit score requires a credit history, which means you must have opened at least one credit account. This could be a credit card, a car loan, a mortgage, or even a secured credit card designed for people building credit. If you have never borrowed, you have no score — lenders call this being "credit invisible." Opening a credit card and using it responsibly is the most common way to start building a score.

How long does it take to build a credit score?

Your first credit score typically appears within one to two months of opening your first credit account, though it may take longer if the account is not reported to all three bureaus immediately. Building a strong score takes longer — most people see meaningful improvement within six months to a year of consistent on-time payments. Recovering from negative events like missed payments or collections takes years, not months.

Do I need to pay interest to build credit?

No. You build credit by opening accounts and paying them on time, not by paying interest. Using a credit card and paying the full balance before the due date builds your score without costing you anything in interest. Carrying a balance does not build credit faster — it only costs you money.

What is a good credit score?

FICO scores range from 300 to 850. Generally, 670 and above is considered good, 740 and above is very good, and 800 and above is excellent. Scores below 580 are considered poor. However, different lenders have different standards — some mortgage lenders require 620 or higher, while others want 740 or higher. The higher your score, the better interest rates you will receive.

Can I dispute information on my credit report?

Yes. If you see an error on your credit report — a payment marked late when you paid on time, an account you did not open, or a balance that is wrong — you can file a dispute with the credit bureau. Contact the bureau in writing (not by phone) and explain what is wrong. The bureau must investigate within 30 days and remove the information if it cannot verify it. You can also dispute directly with the creditor who reported the information.