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Mortgage lenders usually review a three-bureau, or “tri-merge,” credit report and use a mortgage-specific score rather than the consumer score shown in many apps. Traditionally, that means FICO Score 2 from Experian, FICO Score 4 from TransUnion, and FICO Score 5 from Equifax; for one borrower, the lender generally uses the middle of the three scores.
That system is changing for eligible conventional loans. Under an interim framework announced by the Federal Housing Finance Agency (FHFA) in July 2025, lenders delivering loans to Fannie Mae or Freddie Mac may choose either Classic FICO or VantageScore 4.0 while still obtaining all three bureaus. Your lender, loan channel and the model it has implemented determine which score controls your application.
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What credit score do mortgage lenders use?
Most mortgage lenders use FICO scores, according to the Consumer Financial Protection Bureau. Instead of relying on a single score from one bureau, they commonly order a tri-merge report containing credit data and scores from Equifax, Experian and TransUnion.
The lender then applies its underwriting rules to those scores. In the traditional mortgage setup, the three scores are:
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- Experian: FICO Score 2
- TransUnion: FICO Score 4
- Equifax: FICO Score 5
These versions are often called the mortgage FICO models. They are not the same as FICO 8, FICO 9 or VantageScore 3.0 scores that a bank, card issuer or free credit-monitoring service may display. A number in an app can therefore be a useful trend indicator without being the number the mortgage underwriter sees.
How is the score for one borrower selected?
When one borrower has three usable scores, the common rule is to use the middle score, not the highest or lowest. The CFPB describes this as looking at scores from all three major reporting companies and using the middle score when deciding what rate to offer.
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For example, suppose your report shows:
| Bureau | Score |
|---|---|
| Equifax | 721 |
| Experian | 705 |
| TransUnion | 738 |
Your representative score under that traditional approach is 721, the middle value after the three scores are ordered. The 738 does not replace it simply because it is higher, and the 705 does not become the decision score simply because it is lower.
The middle-score rule is a general convention, not a promise that every lender or loan program will use it identically. A lender can have additional eligibility rules, and a portfolio lender that keeps a loan rather than selling it through a government-sponsored-enterprise channel may follow a different policy.
What changed for conventional Fannie Mae and Freddie Mac loans?
FHFA announced an interim policy in July 2025 that permits lenders delivering eligible loans to Fannie Mae and Freddie Mac to use either Classic FICO or VantageScore 4.0. The tri-merge report requirement remains in place; the change concerns the scoring model used with the three-bureau data. FHFA’s credit-score policy page explains the framework and its implementation status.
Fannie Mae says approved lenders may elect VantageScore 4.0 from each of the three bureaus through a three-in-file merged report while continuing to use eligible Classic FICO scores. Its Credit Score Models and Reports Initiative describes the modernization effort. Freddie Mac has published a parallel credit-score models initiative allowing VantageScore 4.0 for eligible mortgages while retaining the tri-merge structure.
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Fannie Mae’s selling guide, updated November 4, 2026, adds an important operational rule: the lender must request the three score versions for either Classic FICO or VantageScore for each borrower, and the same model must be used for all borrowers on one loan. A lender cannot use Classic FICO for one applicant and VantageScore 4.0 for another on that same mortgage.
These policies do not mean every conventional lender has switched models, and they do not govern every mortgage. Ask the lender which model it is actually using rather than assuming that a policy allowing VantageScore means your application will be scored that way.
How are scores combined when two people apply?
For multiple borrowers, Fannie Mae’s method is a two-stage calculation. First, determine each borrower’s median score from that borrower’s three bureau scores. Then average the borrowers’ median scores to determine the score for the loan. The result may not be the lowest score in the household, although a lender can impose additional rules elsewhere in underwriting.
Example:
- Borrower A has scores of 760, 748 and 735. The median is 748.
- Borrower B has scores of 690, 675 and 660. The median is 675.
- The loan score under the stated method is the average of 748 and 675: 711.5.
The lender’s system will apply its required rounding or formatting convention. The key point is that the calculation uses each borrower’s median first, rather than averaging every score from every bureau together. Fannie Mae sets out this process in its guide to determining the credit score for a mortgage loan.
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A consumer-facing score can differ for three main reasons: the service used a different bureau, it used a different scoring model, or it accessed the credit file on a different date. A lender’s tri-merge mortgage report and selected model control the underwriting decision, as Experian’s explanation of mortgage scores notes.
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For instance, a monitoring service might show VantageScore 3.0 based on TransUnion data, while a lender’s traditional report contains FICO Score 2, 4 and 5 from all three bureaus. Even if both reports were pulled close together, the models can interpret the same account history differently. New balances, payments, reported inquiries or an account update between the two pull dates can create another difference.
Do not treat a high app score as a guarantee of a particular mortgage rate, and do not assume a lower app score automatically predicts a denial. Rates and approval also depend on the loan program, debt, income, down payment, property and the lender’s other requirements. The score comparison is about identifying the model and report used, not about finding a universal “true” score.
Does the lender use FICO 8 for a mortgage?
Usually not in the traditional mortgage framework. FICO 8 is widely used for consumer lending, but the classic mortgage mapping is FICO Score 2 for Experian, FICO Score 4 for TransUnion and FICO Score 5 for Equifax.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteFor eligible loans delivered through the Fannie Mae or Freddie Mac channels, the lender may instead have implemented VantageScore 4.0 under the FHFA interim framework. The lender may also continue using eligible Classic FICO scores. Because adoption and eligibility depend on the lender and loan, the only reliable way to identify the model for your application is to ask before the credit report is ordered.
What should you do before applying for a mortgage?
Preparation is less about chasing a score in one app and more about confirming the lender’s process and making all three credit files accurate.
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- Ask for the scoring model and report type. Ask whether the lender will use Classic FICO or VantageScore 4.0, whether it will obtain a tri-merge report, and which loan channel and investor rules apply. Request the answer in writing if the timing matters.
- Review all three credit reports. Look for accounts, balances, payment history and personal information that do not belong to you or are reported incorrectly. Checking one bureau is not enough when underwriting uses all three.
- Dispute errors with the reporting company. Start disputes before applying when possible and keep copies of the supporting documents and responses. An unresolved error on only one bureau can still affect the middle-score calculation.
- Compare your monitoring score cautiously. Use an app or paid service to watch for major changes, but record its bureau, model and date. Do not compare that number directly with a mortgage score unless those details match.
- Ask how joint applicants will be handled. Confirm that each borrower will receive the required three scores and ask how the lender determines the loan score under its investor guidelines.
- Time the check realistically. The score on a lender’s hard-pull report reflects the file as reported at that time. A score you saw weeks earlier can change after a card balance or other account update.
The CFPB recommends checking your credit information and understanding how lenders use scores before seeking a mortgage. Fannie Mae’s general requirements explain the score versions and report requirements that apply to loans delivered under its rules.
What if the three bureaus show very different numbers?
A wide spread does not automatically indicate an error. Different creditors may report to different bureaus, and scoring models can weigh the same information differently. First verify that the underlying accounts and balances are accurate; then ask the lender which score will be representative under its model.
Under the traditional one-borrower approach, the middle score limits the effect of an unusually high or low bureau result. However, a missing score, an insufficient credit history or a lender-specific rule can change how the application is evaluated. The lender should explain what it needs if one bureau cannot produce a usable score.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can a non-GSE or portfolio lender use another score?
Yes. The FHFA framework concerns eligible loans delivered to Fannie Mae or Freddie Mac. A lender that keeps the loan in its own portfolio, sells it through another channel or uses a different government program may apply different score models, documentation standards or representative-score rules.
That is why “mortgage score” is not one universal number. The relevant questions are which bureau data was pulled, which model was selected, which borrowers are on the application and which investor or program rules govern the loan.
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What questions should you ask a mortgage lender?
Before authorizing a credit pull, ask:
- “Will you pull Equifax, Experian and TransUnion in one tri-merge report?”
- “Are you using Classic FICO or VantageScore 4.0 for this loan?”
- “Which exact score versions will you request from each bureau?”
- “For two borrowers, how will you calculate the representative loan score?”
- “Is this loan eligible for the Fannie Mae or Freddie Mac score framework, or does another policy apply?”
- “If my consumer score differs, which lender report and model should I rely on?”
The answers can vary by lender and can change as implementation proceeds, so an older preapproval or a score displayed by a third-party service may not describe the report used for a later application.
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Expect a tri-merge report and a mortgage-specific scoring model. Traditionally, the lender uses FICO Score 2, 4 and 5 across Experian, TransUnion and Equifax and takes the middle score for one borrower. For eligible Fannie Mae and Freddie Mac loans, the lender may choose either Classic FICO or VantageScore 4.0 under the current FHFA framework. Check all three reports, correct errors and ask the lender to identify its model before you apply.
Frequently Asked Questions
Can a lender use VantageScore 4.0 for every mortgage?
No. VantageScore 4.0 is permitted for eligible loans delivered to Fannie Mae or Freddie Mac, but each lender must implement the option and follow the applicable program rules. Portfolio, non-GSE and other loan channels may use different policies.
Does the mortgage lender always use the lowest borrower’s score?
Not under Fannie Mae’s stated multi-borrower method. The lender first finds each borrower’s median of three bureau scores and then averages those borrower medians, although other underwriting requirements can still make a lower-scoring borrower important to approval.
Should I monitor all three bureaus before a mortgage application?
Yes. A tri-merge mortgage report draws from Equifax, Experian and TransUnion, so an error or outdated balance on any one file can affect the representative score. Record the model and date of any monitoring score because a different model is not an apples-to-apples comparison.
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What is the best way to find out my lender’s mortgage score model?
Ask directly before the lender orders credit: request the report type, the exact score model, the loan channel and the method for joint applicants. Consumer apps generally cannot identify the lender’s eventual score unless they use the same bureau, model and reporting date.
