Which Credit Score Does a Mortgage Lender Actually Use?
For one borrower, the lender usually pulls reports from all three credit bureaus and uses the middle score. With two or more borrowers, Fannie Mae prices the loan on the lowest of the borrowers' middle scores, not an average and not the highest. Whether that score is enough depends on the loan program, your payment history and the rest of your file.
Last updated September 29, 2026How does the lender pick the score?
For one borrower, a mortgage application usually pulls a three-bureau report and uses the middle number. If the scores come back 680, 695 and 670, the lender uses 680, not the average.
Which model produces the score can vary: for loans sold to Fannie Mae and Freddie Mac, lenders can use Classic FICO or, as of September 9, 2026, VantageScore 4.0, still from a three-bureau report.
With co-borrowers, each person's middle score is found first, and then the lower of those is used to price the loan under Fannie Mae's guidelines. For checking the minimum score on some manually underwritten loans, Fannie Mae uses the average of the borrowers' middle scores instead. And since November 2025, Fannie Mae's automated underwriting no longer applies a fixed minimum score, relying on its wider risk analysis; government programs still have their own minimums.
Why did my score come out different on different checks?
A quick check, like a soft pull for an early quote, often uses just one bureau. The full application pulls all three. Scores normally vary a bit from bureau to bureau and pull to pull, and that alone usually doesn't mean there's an error.
One bureau offers a free tool that adds utility and streaming payments to your file. Its published data shows an average increase of about 12 to 13 points, and about 19 to 22 points for people with thin files or lower scores. It affects only that bureau's score, so it may not move the middle score a lender uses.
How do credit issues affect qualifying?
A recent late payment on a mortgage or rent can matter more than the score itself, sometimes ruling out a program or sending the file to manual review. Medical collections are generally weighed less heavily than other collections by newer scoring models and many lenders.
It depends on your situation:
- You and a co-borrower have different scores: the lower middle score generally drives pricing.
- Your scores differ across bureaus: some variation is normal.
- You have a recent late housing payment: it can limit your options more than the score.
- You have medical collections: they're often weighed less than other collections.
| One borrower | The middle of three bureau scores |
|---|---|
| Two or more borrowers (Fannie Mae pricing) | The lowest of the borrowers' middle scores |
| Fannie Mae automated underwriting | No fixed minimum score since November 2025 |
| FHA with 3.5% down | A score of 580 or higher |
| FHA from 500 to 579 | 10% down |
Related questions
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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
- https://www.fhfa.gov/policy/credit-scores
Sourced from licensed loan officers and brokers in the FreeRateUpdate network.
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.