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How credit scores actually work
What the number predicts, what feeds it, why you have many scores at once, and the report-versus-score split that matters.
A credit score is not a judgement of your worth as a person; it is a prediction. As the Consumer Financial Protection Bureau puts it: a prediction of your credit behaviour — how likely you are to pay a loan back on time — calculated from the information in your credit reports. Lenders, landlords, insurers and phone companies use it to decide whether to say yes, and at what price.
What actually goes into the number
Scoring models differ, but the CFPB's list of typical factors is stable across them:
- Your bill-paying history — consistently the heaviest single factor.
- Your current unpaid debt and how much of your available credit you are using.
- The number and type of accounts you hold, and how long they have been open.
- New applications for credit — each one can nudge the number down briefly.
- Serious negatives — collections, foreclosure, bankruptcy — and how long ago they happened.
You do not have one credit score
This is the part that surprises people most. A score depends on the scoring model (FICO has many versions; VantageScore is another family), the data source (which credit bureau's report was used), and even the day it was calculated. The same person can see several different numbers in one week, and the score a lender buys may differ from the one a free app shows you. Most scores in the US run on a 300–850 scale, where higher is better — but "good" is defined by each lender, not by the bureaus.
Report versus score
Keep the two separate in your head. The report is the record: accounts, balances, payment history, public records. The score is a model's summary of that record. You can (and should) check the report itself for free — in the US, AnnualCreditReport.com is the official channel; in the UK, the three credit reference agencies (Experian, Equifax, TransUnion) each offer free statutory reports, and there is no single universal UK score, since each lender weights the data its own way.
The error problem
Because the score is only as good as the report, a wrong entry — a debt that is not yours, a payment marked late that was not — quietly prices you out of better rates. Disputing errors with the bureau is free, and per the CFPB's own guidance it belongs in everyone's annual routine, especially before applying for a mortgage or a rental. For readers in Nigeria: the credit bureau system (CRC, CreditRegistry, FirstCentral, licensed by the CBN) is younger and thinner, but the same logic applies — check what the bureaus hold before you need a loan, not after a rejection.
The honest summary: the score is a shadow of your financial behaviour. Improve the behaviour — pay on time, keep balances proportionate, keep old accounts open, apply only for what you need — and every model's shadow moves together. The companion guide covers exactly that.
Sources and further reading
Links were reviewed 2026-09-25. Regulatory permissions, firm status and product terms can change; use the current official register before acting.
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