Which Credit Score Does a Mortgage Lender Actually Use?
For a single applicant, a lender typically pulls credit reports from all three national bureaus and uses the middle (median) of the three scores. When there are two or more borrowers on the loan, the lender uses the lower of the borrowers' median scores, not an average and not the higher score. Beyond that, whether a particular score is "good enough" depends on the loan program, the borrower's payment history, and other details in the file.
Last updated July 22, 2026How does a lender decide which score to use?
For one borrower, a full mortgage application usually pulls a report from all three bureaus (often called a tri-merge report) and takes the middle number as the representative score. If two scores come back as 680 and 695 and one comes back as 670, the middle number, 680, is the one used, not an average of the three.
When there are co-borrowers, each person's own middle score is calculated first. Then the lower of those two scores becomes the score used to qualify and price the loan. This rule exists in the investor guidelines that most conventional lenders follow, and Fannie Mae's own loan delivery system is set up to automatically apply the lower qualifying score rather than let it be shopped around between borrowers.
One nuance worth knowing: as of November 2025, Fannie Mae's automated underwriting system removed its old minimum credit score requirement for conventional loans, relying instead on its broader risk analysis. That mainly affects overall eligibility, not the mechanics described above for which score gets used. Most government loan programs still apply hard minimum score rules (see the table below).
Why did my score come back different on different checks?
A quick preliminary check, sometimes called a soft pull, commonly reflects only one bureau's data, not a full three-bureau report. The full mortgage application later pulls all three bureaus together. It's also normal for scores to vary somewhat from bureau to bureau, or from one pull to the next, with no single consistent pattern of which bureau runs higher or lower. That variation by itself usually doesn't signal an error.
A free tool offered by one credit bureau that adds utility and streaming payment history to a credit file can raise a score, but expect a modest bump rather than a dramatic one. Published data shows an average increase of roughly 12 to 13 points overall, with larger average gains, around 19 to 22 points, for people starting with thin credit files or lower scores. It also only affects that one bureau's score, so it won't help if a lender is pulling scores from the other two bureaus.
How do credit issues affect qualifying?
| Factor | What typically applies |
|---|---|
| FHA loan, 3.5% down payment | Requires a median score of 580 or higher |
| FHA loan, 500 to 579 score | Usually requires a minimum 10% down payment |
| FHA loan, below 500 | Generally not eligible |
| Recent late mortgage/housing payment | Can disqualify the FHA route or push the file to manual underwriting |
| Medical collections | Generally weighed less heavily than other derogatory marks by most scoring models |
A recent or current late payment on a mortgage or rent account can be a bigger obstacle than the score number itself, sometimes ruling out certain loan programs or requiring extra manual review. On the other hand, medical collection accounts are generally treated more leniently than other types of collections by most credit scoring models and many lenders.
It depends on your situation
- If you and a co-borrower have different scores: the lower of your two scores is generally what determines pricing, not an average.
- If your score looks different across bureaus or checks: some variation between bureaus and between a quick check and a full application is normal.
- If you have a recent late housing payment: this can affect which loan programs are available to you, sometimes more than the score itself.
- If you have medical collections on your file: many lenders and scoring models weigh these less heavily than other derogatory marks.
- If one loan program's minimum score doesn't fit your situation: lenders in our network commonly offer programs across a range of credit score bands, so a score that falls short of one program's cutoff may still fit another program's requirements.
Related questions
- minimum credit score to qualify
- how Can You Raise Your Credit Score or Fix Report Errors Before Applying for a Mortgage
- can an Incorrect Credit Report Item Be Disputed, Corrected, or Rapid-Rescored in Time to Help My Mortgage Approval
- what Debt-to-Income Ratio Do You Need to Qualify for a Mortgage, HELOC, or Cash-Out Loan
- what determines your mortgage rate quote
Sources
- https://selling-guide.fanniemae.com/sel/b3-5.1-02/determining-credit-score-mortgage-loan
- https://singlefamily.fanniemae.com/job-aid/loan-delivery/topic/credit_scores.htm
- https://guide.freddiemac.com/app/guide/section/5203.2
- https://singlefamily.fanniemae.com/media/44146/display
- https://www.jdsupra.com/legalnews/fannie-mae-updates-selling-guide-8295184
- https://www.sofi.com/learn/content/tri-merge-credit-report
- https://www.credittechnologies.com/post/how-tri-merge-credit-reports-work-mortgage-lenders
- https://www.rocketmortgage.com/learn/tri-merge-credit-report
- https://www.amerisave.com/learn/understanding-trimerge-credit-reports-in-what-mortgage-borrowers-need-to-know
- https://www.experian.com/blogs/ask-experian/experian-boost-study
- https://www.experian.com/blogs/ask-experian/does-experian-boost-work
- https://www.creditbooster.ai/learn/experian-boost-review-2026
- https://www.hud.gov/sites/dfiles/OCHCO/documents/4000.1hsgh_20191024.pdf
- https://www.bffws.com/programs/fha
- https://memberfirstmortgage.com/wp-content/uploads/2022/11/MFM-Bulletin-025-2022-with-FHA-Manual-UW-guidelines.pdf
- https://www.carringtonwholesale.com/wp-content/uploads/2019/02/Underwriting-Guidelines_FHA-Loans.pdf
- https://www.cnbc.com/select/medical-debt-credit-report
- https://www.experian.com/blogs/ask-experian/medical-debt-and-your-credit-score
- https://www.fico.com/blogs/medical-collection-removals-have-little-impact-fico-scores
Educational information only, not individualized financial or legal advice. Program details and rates change; verify current terms with a licensed loan officer before making a decision.