Mortgage underwriting uses older, industry-specific FICO versions that most free apps never display. That gap surprises more homebuyers than any other part of the process.
Different models, different numbers
Conventional mortgage lenders have traditionally used FICO Score 2 (Experian), FICO Score 5 (Equifax) and FICO Score 4 (TransUnion). Free consumer apps typically show VantageScore 3.0. It is normal for those numbers to differ by 20 to 60 points, in either direction.
How the qualifying score is picked
- The lender pulls all three bureaus and uses the middle of the three scores
- With two borrowers, most programs use the lower of the two middle scores
- So the weakest bureau file, not the strongest, often decides your rate
Older models are stricter
The mortgage versions still count paid collections and treat medical debt like any other collection, which newer models do not. An item your credit app has already stopped penalizing can still be sitting in the score your lender sees.
Preparing 6 to 12 months out
- Audit all three bureaus and correct inconsistencies early — investigations take time
- Get utilization under 10% before the pull
- Do not open or close accounts during the process
- Do not make large unexplained deposits or take on new debt
- Keep documentation of every dispute resolution to show the underwriter
Score is one part of approval
Debt-to-income ratio, down payment, reserves, and employment history all weigh alongside the score. We provide educational guidance on how lenders read a credit profile — we are not a mortgage lender and cannot guarantee approval.
This content is educational only and is not legal, tax or financial advice. Arreglocredito.com is not a law firm. Consumers have the right to dispute inaccurate information directly with the credit reporting agencies at no cost. Individual results vary.