Equifax, Experian, TransUnion: How the Big Three Bureaus Differ
Why the same person can have three different credit reports — and which bureau matters for which loan.
Three private companies, one regulated industry
The "big three" credit bureaus — Equifax, Experian, and TransUnion — are privately owned, publicly traded corporations. They are not government agencies. They collect data on roughly 220 million US adults by buying it from creditors (banks, card issuers, mortgage servicers, collection agencies) who voluntarily report consumer accounts.
Because reporting is voluntary, no two bureau files are identical. A credit card issuer might report to all three, two, or just one. A small regional bank might not report at all. The same late payment can appear in two reports and be missing from the third — which is exactly why your three scores rarely match.
What each bureau is known for
Equifax (Atlanta, GA, founded 1899). The oldest of the three and historically the most popular with mortgage lenders in the Southeast and Midwest. Known for the 2017 breach that exposed 147 million Americans' data — settlements are still being paid out. Equifax's FICO Score 5 is one of the three required mortgage scores.
Experian (Dublin, Ireland HQ; US ops in Costa Mesa, CA). The largest globally by data volume. Known for offering the most generous free consumer tools — free FICO 8, free credit lock, and Experian Boost (which lets you add utility and streaming payments to your file). Heavy presence with auto lenders. FICO Score 2 is the required mortgage score.
TransUnion (Chicago, IL, founded 1968). The youngest of the three. Widely used by landlords, employers, and credit card issuers for screening. TransUnion's FICO Score 4 is the required mortgage score, and its data feeds Credit Karma's free VantageScore.
Why your reports differ
Three reasons:
- Selective reporting by lenders. Some creditors only report to one or two bureaus. American Express, for example, historically underreported to Experian.
- Timing. Data updates land at different days of the month at each bureau. A statement closing on the 5th may post to TransUnion on the 7th and Experian on the 10th.
- Disputes resolve independently. If you dispute an error, you must dispute it with each bureau separately — fixing it at Experian doesn't touch Equifax.
Which bureau matters for which loan
| Use Case | Primary Bureau Pulled |
|---|---|
| Mortgage | All three; lender uses the middle FICO score |
| Auto loan | Experian or Equifax, often with the auto-enhanced FICO |
| Credit card | Varies by issuer; Chase leans Experian, Amex leans Experian, Capital One often pulls all three |
| Apartment rental | TransUnion most common |
| Employment screening | TransUnion or Equifax (with your written consent) |
| Utilities / cell | Equifax most common |
Your rights under the FCRA
The Fair Credit Reporting Act gives you:
- One free report per bureau, per year at AnnualCreditReport.com — the only federally authorized source. Since 2023 this has been weekly and permanent, not just annual.
- The right to dispute any item in your file. The bureau has 30 days to investigate.
- The right to a free credit freeze and unfreeze at all three bureaus. A freeze stops new accounts from being opened in your name and is the single best identity-theft defense.
- The right to one free additional report within 60 days of being denied credit, employment, or insurance because of your file.
What to do today
- Pull all three reports at AnnualCreditReport.com (free, no card needed).
- Place a free credit freeze at each bureau's website — takes 10 minutes total.
- Skim each report for accounts you don't recognize, wrong balances, or late marks that should have aged off.
- Dispute anything wrong with the bureau that's reporting it. Online disputes resolve fastest.
The bureaus aren't going anywhere. Knowing how they differ is the difference between a 720 mortgage approval and a 680 surprise at closing.