How Credit Scores Work: The 5 Factors That Set Your Number
Your score is a risk model built from your credit reports — not a grade on your finances. Here's what actually feeds it.
In this guide 7 sections
Quick answer: A credit score is a three-digit number, usually between 300 and 850, that predicts how likely you are to repay borrowed money on time. It is calculated from the accounts and payment history on your credit reports. Payment history and amounts owed drive most of the result.
The number gets treated like a grade for being a responsible adult. It isn't. Credit scores work as a risk model built for lenders, and they only measure what shows up on your credit reports — nothing about your income, savings, or job.
This explainer covers how credit scores work in 2026: what goes into the calculation, why you have more than one score, how long items stay on your reports, and which moves actually change the number. It is written for anyone who has checked a score, seen it move, and had no idea why.
What five factors determine how credit scores work?
FICO publishes the weights, and they have been stable for years. Payment history counts for 35%, amounts owed for 30%, length of credit history for 15%, new credit for 10%, and credit mix for 10%.
| Factor | Weight | What it measures | How fast it moves |
|---|---|---|---|
| Payment history | 35% | On-time versus late payments | Slowly, over months |
| Amounts owed | 30% | Balances against limits | One to two billing cycles |
| Length of history | 15% | Age of oldest and average accounts | Years |
| New credit | 10% | Recent applications and accounts | Three to twelve months |
| Credit mix | 10% | Cards, loans, mortgages held | Years |
Amounts owed is the one worth understanding first, because it is the only major factor you can change this month. It is mostly credit utilization: the balance on your revolving accounts divided by their limits. Pay a $3,000 balance down to $600 on a $10,000 limit and the ratio drops from 30% to 6%, usually reflected on your next statement date.
Payment history is the heaviest factor and the slowest to repair. The Consumer Financial Protection Bureau (CFPB) explanation of credit scores describes these same inputs, and it makes the same point we make at Coinpurse: one 30-day late payment can cost a strong score more points than six months of perfect behavior earns back.
What is a good credit score?
On the common 300-850 scale, 670 and above is generally treated as good, 740 and above as very good, and 800 and above as exceptional. Below 580 is usually labeled poor. Lenders set their own cutoffs, so these bands describe convention, not rules.
The bands matter less than the pricing tiers behind them. Mortgage rates, auto loan rates, and card approvals step at specific thresholds, often at 620, 660, 700, and 760. Going from 735 to 745 can change nothing. Going from 755 to 765 can change your mortgage rate.
Scale matters too. The Federal Reserve Bank of New York's Household Debt and Credit Report tracks balances and delinquency rates across the country each quarter, and it shows how much of household borrowing — mortgages, auto loans, cards, student debt — is priced off these scores. This is not a number that only matters when you apply for something.
Worth knowing: there is no score at which lenders stop caring about income. A 780 score with no verifiable income still fails a mortgage underwriter.
Why do you have more than one credit score?
Because multiple companies build scoring models, and each model runs separately against each of your three credit reports. FICO and VantageScore are the two main developers, each publishes multiple versions, and some versions are tuned for auto or card lending specifically.
That means a 30-point spread between the score in your banking app and the one a lender pulls is normal, not an error. The free score your card issuer shows is often a VantageScore, while most mortgage lenders still pull older FICO versions. Both are real scores. They are answering slightly different questions.
Do not chase the gap. At Coinpurse we tell readers to track one score consistently and watch its direction rather than comparing two sources on the same day. The behaviors that raise one raise the others.
Do Joint Accounts and Co-Signing Affect Your Score the Same Way?
No, and mixing them up is a common mistake. A joint account puts both people on the hook equally, and both people's credit reports show the full account, its full balance, and its full payment history exactly the same way.
Co-signing is different in practice, not in name. As a co-signer, you're not using the account day to day, but the balance and payment history still land on your report in full, exactly as if you were the primary borrower. A co-signed auto loan someone else is paying late damages your score the same amount it damages theirs, with no way to limit your exposure short of removing your name from the loan.
Authorized-user status is the lightest touch of the three. You get the account's balance and history added to your report, but you carry no legal obligation to pay it, and being removed as an authorized user simply drops the account from your file going forward. That asymmetry — benefit without liability — is exactly why it's the tool of choice for building a teenager's or a new immigrant's credit file, and why lenders sometimes discount authorized-user tradelines when underwriting a loan.
At Coinpurse, our standing advice is simple: only co-sign for someone whose missed payment you could genuinely absorb yourself, since that's the actual risk you're taking on, not a favor with no downside.
Where does the data in your score come from?
All of it comes from your credit reports at Equifax, Experian, and TransUnion. Lenders report your balances, limits, and payment status to some or all three, usually monthly. The scoring model reads that report and produces a number. No other data enters the calculation.
That is why the reports themselves deserve attention. You can pull all three free at AnnualCreditReport.com, the site authorized under federal law for this purpose. Errors are common enough to be worth checking: a paid-off loan still showing a balance, an account that is not yours, a late payment that was never late.
Timing rules are fixed. Most negative items — late payments, collections, charge-offs — fall off seven years after the original delinquency. A Chapter 7 bankruptcy stays for ten. Accurate negative information cannot be removed early, whatever a credit repair ad promises, and the Federal Trade Commission (FTC) guidance on credit repair scams is blunt about companies claiming otherwise.
What actually raises a credit score?
Three things, in order of speed: lower your reported balances, keep every payment on time, and leave old accounts open. Everything else is noise by comparison.
Lowering utilization works fastest because issuers report your balance once a month, usually on the statement date. Pay the card down before that date, not just before the due date, and the lower number is what gets reported. Readers who do this once see the effect within about 30 to 45 days.
Leaving old accounts open protects the length-of-history factor. Closing your oldest card shortens your average account age and removes its limit from the utilization math, which can raise your ratio overnight. If the card has no annual fee, keeping it open with a small recurring charge is usually the better move.
There is an upstream version of this, too. If surprise expenses are what push your balances up each year, the durable fix is cash rather than a higher limit, which is the argument behind our guide to building an emergency fund from scratch. Utilization stays low when the car repair does not go on the card.
And checking your own score changes nothing. That is a soft inquiry. Only a lender's hard inquiry, tied to an application, affects the number, and its impact is small and fades within a year.
The bottom line on how credit scores work
A credit score is a prediction built from your credit reports, weighted heavily toward whether you pay on time and how much of your available credit you are using. It is not a judgment of your finances as a whole, and it does not know what you earn.
Your next step: pull your three reports at AnnualCreditReport.com, check them for errors, and then look at what percentage of your card limits you are currently carrying. Those two actions cover the factors that account for 65% of the score.
By Tom Reyes, Contributing Writer at Coinpurse. Fact-checked as of September 2026.
Coinpurse covers personal finance — saving, credit, banking, and budgeting — for people managing real money on an ordinary paycheck.
