TransUnion and Equifax use different data and math, so your score will usually differ between them
TransUnion and Equifax are both credit reporting agencies — companies that collect payment history, debt amounts, and other financial data about you, then sell that information to lenders. They are separate businesses with separate databases. Because they don't always have the same information about you, and because they use different scoring formulas, your TransUnion score and your Equifax score will often be different numbers.
The difference is normal and expected. A lender pulling your credit report may use TransUnion, Equifax, or both — or neither, if they use Experian, the third major bureau. You don't control which one they choose. What matters is that all three bureaus are tracking the same core facts: whether you pay on time, how much you owe, and how long you've had credit accounts open.
Understanding why the scores differ helps you know what to check when you review your own credit reports and what to expect when you explore for a loan or credit card.
Key Takeaways
- TransUnion and Equifax maintain separate databases, so one bureau may have information the other doesn't yet, causing score differences of 50 to 100 points or more.
- Each bureau uses its own scoring model, which weights payment history, debt amounts, and account age differently, even when they have identical data on you.
- You can request a free credit report from each bureau once per year through AnnualCreditReport.com, the official government site.
- Lenders choose which bureau to pull from, so you may see different scores depending on who is checking your credit.
- Errors on one bureau's report don't automatically appear on the other, so you may need to dispute inaccuracies separately with each one.
Why the data differs between TransUnion and Equifax
Creditors and lenders report payment information to the three major bureaus, but they don't always report to all three at the same time. A credit card company might send updated information to Equifax on the 15th of each month and to TransUnion on the 20th. During that gap, one bureau will have newer information than the other.
Some creditors report to only one or two bureaus, not all three. A small local lender or a store credit card might report only to Equifax, for example, so TransUnion won't have that account in its file on you. Conversely, a major bank might report to all three, but a medical debt collector might report only to TransUnion and Experian.
Hard inquiries — the checks lenders make when you explore for credit — also vary. When you explore for a mortgage, the lender might pull from Equifax only. When you explore for a credit card, the issuer might pull from TransUnion. These inquiries appear on the bureau that pulled your report, affecting your score there but not at the others.
How TransUnion and Equifax calculate scores differently
Both bureaus use scoring models that typically consider five main factors: payment history (whether you pay on time), amounts owed (how much debt you carry), length of credit history (how long you've had accounts), credit mix (different types of accounts like cards and loans), and new credit (recent applications). But they weight these factors differently.
TransUnion's scoring model may place slightly more emphasis on recent payment behavior, while Equifax's model may weight the age of your accounts more heavily. Neither bureau publishes the exact percentages — that's proprietary information — but the difference means that even if both bureaus have identical data on you, your score at one may be 30 to 50 points higher or lower than at the other.
Both bureaus also offer multiple scoring models. The most common is the FICO score, but TransUnion offers its own branded score called the TransUnion Credit Score, and Equifax offers the Equifax Credit Score. These alternative scores use different math than FICO and may differ even more widely from each other.
What score a lender actually sees
When you explore for a loan, credit card, or mortgage, the lender chooses which bureau to pull from. They might pull from one bureau, all three, or even a specialty bureau that focuses on a particular type of credit. The score the lender sees depends on which bureau they chose and which scoring model they use.
A mortgage lender typically pulls from all three bureaus and uses the middle score of the three. A credit card issuer might pull from only one. An auto lender might use a specialty auto score that weights payment history on car loans more heavily than other factors. You won't know in advance which bureau or which score the lender will use.
This is why your credit score can vary significantly depending on who is checking it. The lender isn't looking at "your" score — they're looking at the score that their chosen bureau calculated using their chosen model.
How to check your own TransUnion and Equifax scores
You are may have access to to one free credit report from each of the three major bureaus per year. Go to AnnualCreditReport.com, the official government site run by the three bureaus themselves. You can request reports from TransUnion, Equifax, and Experian all at once or one at a time. The reports are free; the site will not ask for a credit card.
The free report shows your account history and payment records but does not include your credit score. To see your actual score from TransUnion or Equifax, you typically have to pay, or you can use a free credit monitoring service like Credit Karma or NerdWallet, which show scores from one or more bureaus. Be aware that these free services may show you a score that differs from what a lender sees, because lenders use different scoring models.
When you pull your reports, check each one for errors: accounts you don't recognize, late payments you didn't make, or duplicate accounts. If you find an error on one bureau's report, you'll need to dispute it with that bureau separately. An error on your Equifax report won't automatically be corrected on your TransUnion report.
Disputing errors on each bureau separately
If you find an inaccuracy on your TransUnion report, contact TransUnion directly to dispute it. If you find an error on your Equifax report, contact Equifax. The bureaus don't share dispute information, so correcting an error at one bureau doesn't correct it at the other.
You can dispute online, by mail, or by phone. TransUnion's dispute process is at transunion.com/dispute, and Equifax's is at equifax.com/personal/disputes. Both allow you to upload documents supporting your claim — for example, a bank statement showing a payment you made, or a letter from a creditor confirming an account was closed.
The bureau has 30 days to investigate your dispute. If they find the information is inaccurate, they must correct or delete it. If they find it is accurate, the disputed item stays on your report. Either way, they must send you the results in writing.
Which score matters more
Neither TransUnion nor Equifax is inherently "more important." What matters is the score the lender you're explore to actually uses. If you're explore for a mortgage, the lender will likely pull from all three bureaus, so all three scores matter equally. If you're explore for a credit card, the issuer might pull from only one, so only that bureau's score matters for that process.
The best approach is to keep all three of your credit reports accurate and your payment history clean across all bureaus. Focus on the behaviors that improve any credit score: paying bills on time, keeping credit card balances low, and not opening new accounts unless you need them. These actions will improve your score at TransUnion, Equifax, and Experian alike.
Frequently Asked Questions
Why is my TransUnion score 80 points higher than my Equifax score?
The difference could be due to data lag — one bureau may have newer information than the other — or to the different scoring models each uses. Pull your free reports from both bureaus at AnnualCreditReport.com and compare the accounts listed. If one bureau is missing recent payments or has old late payments still showing, that explains the gap. If the accounts match, the difference is likely the scoring formula.
Can I improve my score at one bureau without affecting the others?
No. Payment history, debt amounts, and account age affect your score at all three bureaus the same way. If you pay a bill on time, all three bureaus will eventually see that payment and your score will improve at all three. The timing may differ slightly because of reporting delays, but the direction is the same.
Do I need to monitor all three bureaus or just one?
Monitoring all three is better because errors can appear at one bureau and not the others. You get one free report per bureau per year from AnnualCreditReport.com. You can stagger them — pull one every four months — to monitor your credit throughout the year without paying.
Which bureau do most lenders use?
It varies by lender and loan type. Mortgage lenders typically pull from all three. Credit card issuers might pull from one, two, or all three. Auto lenders often have their own preferences. There's no single "most used" bureau — it depends on the lender.
If I dispute an error with Equifax, does TransUnion have to fix it too?
No. Each bureau maintains its own database and handles its own disputes. If you find an error on your Equifax report, you must dispute it with Equifax. If the same error appears on your TransUnion report, you must dispute it separately with TransUnion.