How Credit Works for Dummies: Scores, Reports, and Bureaus

Credit works like this: when you borrow money or use a credit card, the lender reports what you do to three private companies called credit bureaus, those bureaus compile your activity into a credit report, and a scoring model turns that report into a three-digit number between 300 and 850. Lenders, landlords, and insurers use the number and the report behind it to decide whether to approve you and what to charge. Understanding how credit works comes down to four things: what the number means, what drives it, what the report says about you, and what rights you have to see and fix it.

What the Score Numbers Mean

Credit scores sort into five rough tiers. These aren’t fixed by law, and different lenders draw their own cutoffs, but the ranges FICO and the bureaus use in consumer materials are a reliable shorthand.

Exceptional, 800–850. Best rates and near-automatic approvals.
Very Good, 740–799. Still qualifies for excellent rates on mortgages and auto loans.
Good, 670–739. Most lenders consider this acceptable, though not always at the lowest rate.
Fair, 580–669. Options narrow, and interest rates climb.
Poor, 300–579. Approvals are difficult. Secured cards and credit-builder loans are usually the way back up.

A mortgage lender might treat a 720 differently than a credit card issuer does, so the tier is a guide to how you’ll be seen in general rather than a promise of a specific outcome.

What Actually Moves Your Score

The most widely used scoring model is FICO, and it weights five categories of your behavior.

Payment history is the biggest factor at 35 percent. A single payment more than 30 days late can drop your score significantly, and the damage grows the later it goes. People at the top of the scale almost universally have zero missed payments.¹

Credit utilization is next at 30 percent. That’s how much of your available credit you’re actually using. A $3,000 balance on a card with a $10,000 limit is 30 percent utilization. Lower is better. The common advice to stay under 30 percent is really a floor, not a target: people with the highest FICO scores tend to use around 4 to 5 percent of their available credit.²

The remaining three factors matter less individually but still count. Length of credit history is 15 percent, which is why closing your oldest card can backfire. Credit mix is 10 percent, rewarding you for handling different account types rather than one. New credit is the last 10 percent, and opening several accounts in a short window can pull your score down temporarily.²

FICO isn’t the only model. VantageScore, built by the three bureaus together, uses the same 300–850 range but weights things differently: payment history 41 percent, depth of credit 20 percent, utilization 20 percent, recent applications 11 percent, total balances 6 percent, and available credit 2 percent.³ Mortgage lenders overwhelmingly use FICO; some credit card companies and fintech lenders check VantageScore. The scores won’t be identical across models, but the same habits help both.

The Accounts Behind the Score

Credit accounts come in two main shapes. A revolving account, like a credit card, gives you a spending limit and lets you borrow against it repeatedly as you pay it back. You make a minimum monthly payment, any balance you carry forward accrues interest, and the account stays open as long as you keep it in good standing.

An installment account is a fixed loan you repay in equal payments over a set period. Auto loans, mortgages, and student loans all work this way. A five-year car loan is 60 equal monthly payments until the balance hits zero, and then the account closes. Installment accounts help your credit mix and show you can handle a longer commitment.

Starting From Zero

With no credit history at all, two entry points are common. A secured credit card works like a regular card, but you put down a refundable cash deposit that typically becomes your credit limit. Minimum deposits vary by issuer, from under $50 to several hundred dollars. You use the card, make payments, and the issuer reports activity to the bureaus like any other card.

Becoming an authorized user on a family member’s card is the other common path. The primary cardholder adds you, and the card’s history can appear on your report. This only works if the issuer reports authorized user activity to the bureaus, so confirm that before going through with it. If the primary cardholder carries high balances or misses payments, those negatives also land on you.

The Three Bureaus and Where the Data Comes From

Equifax, Experian, and TransUnion are private companies that collect your financial data and package it into reports.⁴ They don’t approve or deny loans. Banks and other creditors voluntarily send them your payment history, account balances, and account openings, generally on a monthly cycle. When you apply for a loan, the lender pulls your report from one or more bureaus and uses it to assess you.

Each bureau collects data independently. A creditor might report to two of them but not the third, or timing differences can create small discrepancies, so your Equifax report might not match your TransUnion report exactly. That’s why checking all three matters.

What’s Inside Your Credit Report

A credit report has four sections.

Personal information sits at the top: your name, current and previous addresses, Social Security number, and date of birth. This section is for identification and doesn’t affect your score, but errors here can pull someone else’s accounts onto your file. When two people share a similar name, Social Security number, or address, bureau matching algorithms sometimes merge them into one. These “mixed files” are a common error and hard to untangle.

Trade lines are your accounts. Every credit account tied to your name shows up here, open or closed, with the creditor’s name, open date, credit limit or original loan amount, current balance, and a month-by-month record of whether payments arrived on time. Negative marks like collections or charge-offs stay on your report for seven years from the date of the first missed payment.⁵

Public records on a modern credit report are mostly bankruptcies. A Chapter 7 or Chapter 13 bankruptcy can remain for up to ten years from the filing date.⁵

Inquiries log every request for your report. Hard inquiries happen when you apply for credit and can lower your score slightly. They stay on your report for two years but generally only affect your score for the first twelve months. If you’re rate-shopping for a mortgage or auto loan, multiple hard inquiries for the same loan type within a 14-to-45-day window typically count as a single inquiry for scoring. Soft inquiries, like checking your own report or being pre-screened for an offer, don’t affect your score and are only visible to you.

Who Else Can See Your Credit

Lenders aren’t the only ones pulling your report. Federal law lists specific “permissible purposes” that let other parties access it.⁶

Employers can check a modified version of your report during hiring, but only with your written permission. If they decide not to hire you based on what they find, they must give you a copy and a chance to respond before making that final.⁷
Landlords routinely pull reports when screening rental applications and typically request your written consent on the application itself.⁸
Home and auto insurance companies in most states use credit-based insurance scores to help set premiums. A weaker credit history can mean noticeably higher premiums.
Certain government agencies can access your report when evaluating eligibility for a license or benefit tied to financial responsibility.

No one can legally pull your report out of curiosity. Every access must fit a permissible purpose spelled out in the Fair Credit Reporting Act.

How to Get Your Report for Free

Federal law entitles you to one free report from each of the three bureaus every twelve months, available through the centralized site AnnualCreditReport.com.⁹ You actually have more access than that: the three bureaus have permanently extended a pandemic-era program allowing free weekly reports through the same site, and Equifax is offering six additional free reports per year through 2026.¹⁰

You can also get extra free reports outside the annual entitlement if you’ve been denied credit or insurance based on your report, if you’re unemployed and plan to look for work within 60 days, if you’re on public assistance, or if you believe your file contains errors from fraud.¹¹ Requests can be made online, by phone, or by mail. By mail, the bureau has 15 days from receiving your request to send the report.⁹ Online, the report is typically available instantly after identity verification.

How to Fix Errors on Your Report

Under the Fair Credit Reporting Act, you have the right to dispute any information on your report that you believe is inaccurate or incomplete. When you file a dispute, the bureau must investigate for free and resolve it within 30 days. If you provide additional supporting information during the investigation, the deadline extends to 45 days.¹²

The bureau must review all relevant information you submit and forward your dispute to the creditor that reported the item. If the item can’t be verified or turns out to be wrong, the bureau must delete or correct it and notify you. If the investigation goes against you, you can add a brief statement of up to 100 words to your file explaining your side, and future lenders will see it alongside the disputed item.

Gather anything that supports your case before you file: bank statements showing a payment arrived on time, a loan payoff letter, or identity documents if someone else’s account landed on your file. Submit disputes in writing by certified mail rather than relying only on online portals, and keep copies of everything you send.¹²

Credit Freezes and Fraud Alerts

A credit freeze blocks new creditors from pulling your report entirely, which effectively stops anyone from opening accounts in your name. Placing and lifting a freeze is free by federal law, and the bureaus must activate it within one business day for online or phone requests and three business days for mail requests.¹³ When you need credit yourself, you temporarily lift the freeze with a PIN or password the bureau provides. A freeze doesn’t affect your score.

A fraud alert is lighter touch. Instead of blocking access, it tells lenders to take extra steps to verify your identity before opening a new account. An initial fraud alert lasts one year and can be renewed. If you’ve been a victim of identity theft and file an FTC or police report, you can place an extended fraud alert that lasts seven years.¹⁴

One practical difference: a fraud alert only has to be placed with one bureau, which is legally required to notify the other two. A freeze must be placed separately with each bureau. If you suspect your information has been compromised but aren’t sure, starting with a fraud alert is the faster move. If you know an account was opened fraudulently, a freeze on all three bureaus gives you the strongest protection.

1
FICO. The Perfect Credit Score: Understanding the 850 FICO Score
2
myFICO. How Are FICO Scores Calculated
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VantageScore. The Complete Guide to Your VantageScore Credit Score
4
Consumer Financial Protection Bureau. Companies List
5
Office of the Law Revision Counsel. 15 U.S. Code 1681c – Requirements Relating to Information Contained in Consumer Reports
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Office of the Law Revision Counsel. 15 U.S. Code 1681b – Permissible Purposes of Consumer Reports
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Federal Trade Commission. What Employment Background Screening Companies Need to Know About the Fair Credit Reporting Act
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Federal Trade Commission. Using Consumer Reports: What Landlords Need to Know
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Office of the Law Revision Counsel. 15 USC 1681j – Charges for Certain Disclosures
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Federal Trade Commission. Free Credit Reports
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Consumer Financial Protection Bureau. A Summary of Your Rights Under the Fair Credit Reporting Act
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Office of the Law Revision Counsel. 15 USC 1681i – Procedure in Case of Disputed Accuracy
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Office of the Law Revision Counsel. 15 U.S. Code 1681c-1 – Identity Theft Prevention; Fraud Alerts and Active Duty Alerts
14
Federal Trade Commission. Credit Freezes and Fraud Alerts