What a credit score is and why lenders use it

A credit score is a three-digit number that summarizes your history of borrowing and repaying money. Lenders — banks, credit card companies, landlords, and sometimes employers — use it to decide whether to lend you money, what interest rate to charge you, and how much risk you pose. The score ranges from 300 to 850, with higher numbers meaning lower risk.

Your score is built from data in your credit report, a record maintained by three major companies: Equifax, Experian, and TransUnion. These companies collect information about every loan, credit card, and payment you have made, then sell that information to lenders. You can view your own credit report for free once per year at annualcreditreport.com, the official site run by the three bureaus.

The score itself is calculated by a formula — most commonly the FICO score, created by Fair Isaac Corporation. The formula weighs different parts of your payment history differently. Understanding what goes into the score helps you see where you have the most control.

Key Takeaways

  • Payment history makes up 35 percent of your FICO score, so a single late payment can lower your score by dozens of points and stay on your report for seven years.
  • The amount you owe compared to your credit limit (called utilization) counts for 30 percent, and paying down balances can raise your score within weeks.
  • The length of your credit history and the mix of different types of credit (cards, loans, mortgages) together make up 25 percent of your score.
  • Hard inquiries from lenders checking your credit and new accounts you open each count for a small portion, but multiple inquiries in a short time can signal financial stress.
  • You can check your own credit report without affecting your score, and you have the right to dispute errors on it.

Payment history: the largest factor in your score

Whether you pay on time is the single biggest piece of your credit score — 35 percent of the FICO calculation. A payment 30 days late starts to damage your score. A payment 60 days late damages it more. A payment 90 days late damages it even more. Once you are 120 days late, the account may be sent to a collection agency, which is a major red flag to future lenders.

Late payments stay on your credit report for seven years from the date you first missed the payment, even if you pay it back later. Paying a debt that is already in collections will not remove it from your report, but it does show future lenders that you eventually paid. Some lenders weight recent late payments more heavily than older ones, so a late payment from two years ago hurts less than one from two months ago.

If you have missed a payment, the fastest way to stop the damage is to pay it as soon as you can. The longer it sits unpaid, the worse it gets. After that, the best strategy is to build a new pattern of on-time payments going forward — that will gradually outweigh the late payment in the lender's eyes.

Credit utilization: how much you owe versus your limit

The second-largest factor is credit utilization, which counts for 30 percent of your score. This is the total amount you owe on all credit cards and revolving credit lines, divided by your total credit limits. If you have three credit cards with $1,000 limits each (total $3,000) and you owe $900 across them, your utilization is 30 percent.

Lenders prefer to see utilization below 30 percent. The lower, the better — 10 percent or less is ideal. Utilization above 50 percent signals that you are relying heavily on credit, which raises the risk that you will miss a payment. The good news is that utilization changes month to month as you pay down balances, so paying off a credit card can raise your score within weeks, unlike a late payment which takes years to fade.

If you have a low credit limit, even a small balance can push your utilization high. Asking your credit card company to raise your limit (without a hard inquiry, if possible) can lower your utilization when ready. Alternatively, paying down the balance is the direct route.

Credit history length and account mix

The length of your credit history accounts for 15 percent of your score. This includes how long your oldest account has been open and the average age of all your accounts. A long history of responsible borrowing is a sign of stability. This is why closing old credit cards can hurt your score — it shortens your average account age and removes old positive payment history from the calculation.

The types of credit you use make up another 10 percent. Revolving credit (credit cards and lines of credit) and installment credit (car loans, personal loans, mortgages) are weighted differently. Having both types shows you can manage different kinds of debt. If you have only credit cards and no installment loans, your score may be lower than someone with a mix, all else equal.

You cannot quickly change your credit history length, but you can avoid closing old accounts. If you have a credit card you no longer use, keeping it open with a small charge every few months (and paying it off) maintains the account age without adding debt.

Hard inquiries and new accounts

When you explore for a credit card, loan, or mortgage, the lender runs a hard inquiry — a check of your credit report. Each hard inquiry can lower your score by a few points. Multiple hard inquiries in a short time (within 14 to 45 days, depending on the scoring model) count as a single inquiry for most purposes, so shopping for a car loan or mortgage in a short window does not hurt as much as spreading applications over months.

New accounts also lower your score slightly because they shorten your average account age and signal that you have recently taken on new debt. The impact fades over time as the account ages. Opening many new accounts in a short period is a red flag — it suggests you are desperate for credit or planning to take on a lot of debt.

If you need credit, it is better to explore for what you actually need in a short window than to space applications out. Once you have the credit, avoid opening new accounts unless necessary.

How to check your credit report and dispute errors

You are may have access to to one free credit report per year from each of the three bureaus. Go to annualcreditreport.com and request reports from all three — they may differ slightly because not all lenders report to all bureaus. Checking your own report does not lower your score; that only happens with hard inquiries from lenders.

Read each report carefully for errors: accounts you did not open, payments marked late that you made on time, or accounts that should have been closed. Errors are common. If you find one, you can dispute it directly with the bureau by mail or online. The bureau must investigate within 30 days and remove the error if it cannot verify it. You can also dispute directly with the creditor.

If you find a late payment that was your mistake, disputing it will not remove it — but you can write a statement to be added to your report explaining the circumstances. Some lenders will consider this when reviewing your process.

What does not affect your credit score

Your credit score is based only on borrowing and repayment. It does not include income, employment history, savings, or assets. A wealthy person with no credit history has no credit score at all. A person with a high income but a history of late payments has a low score.

Checking your own credit report or score does not lower it. Soft inquiries — checks by employers, insurance companies, or creditors reviewing existing accounts — do not lower your score either. Only hard inquiries from lenders you have applied to count against you.

Paying off a debt in full does not erase it from your report. It stays for seven years (or longer for some items like bankruptcy), but it shows as paid, which is better than unpaid. Closing a credit card does not remove it from your report either — it stays for ten years.

Frequently Asked Questions

How long does it take to build a credit score from scratch?

You need at least one account that has been open for six months with at least one reported payment to have a FICO score. Most people see a score within one to two months of opening a credit card or becoming an authorized user on someone else's account. Building a strong score (above 700) typically takes one to two years of on-time payments.

Can I raise my score quickly?

Paying down credit card balances can raise your score within weeks because utilization changes when ready. Disputing errors on your report can also help if they are removed. Late payments and collections accounts fade slowly over time but cannot be removed early. Building a strong score is a gradual process, not a quick fix.

Does my score have to be perfect to get a loan?

No. Different lenders have different minimums. Credit card companies may approve scores as low as 580. Mortgage lenders typically want 620 or higher, though some go lower. Auto lenders often work with scores in the 500s. A lower score usually means a higher interest rate, not automatic rejection.

What happens if I have no credit history?

You can build credit by becoming an authorized user on someone else's credit card account, opening a secured credit card (which requires a cash deposit), or taking out a credit-builder loan from a credit union. Each method reports to the credit bureaus and helps you establish a score over time.

How often should I check my credit score?

Checking your own score does not lower it, so you can check as often as you want. Many credit card companies and banks offer free score monitoring to their customers. Checking once or twice a year is enough to catch major changes, but monthly monitoring helps you see the impact of paying down balances or other changes.