When two people apply together, lenders typically use the lower middle score of the two borrowers. Each borrower has three scores (Experian, Equifax, TransUnion). The lender takes the middle score for each person, then uses the lower of those two.
Person A: scores 720, 710, 695 → middle score = 710
Person B: scores 580, 590, 575 → middle score = 580
Lender uses: 580
All the income from both borrowers is included. All the credit from the worst borrower is included. You get the income benefit but also the credit penalty.
If the higher-income person has the better credit, they can apply alone. The lower-credit person can be added to the title (ownership) after closing without being on the loan.
The problem: you lose the second person's income for qualification. If you can qualify on one income, this is often the better path.
FHA loans allow a non-occupying co-borrower — a parent, for example — to be on the loan without living in the property. The co-borrower's income and credit are both used. This can help if the occupant has lower income but decent credit.
If the lower-credit person's score is the primary issue, a 6-12 month credit repair program before applying can make an enormous difference. A 580 score to 640 can mean the difference between FHA-only and conventional loan options — and $30,000+ over the life of the loan.
If the bad credit is due to collections, late payments, or high utilization — not a bankruptcy or foreclosure — scores can move 50-80 points in 3-6 months with focused effort.
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After 23 years reviewing mortgage files, these are the services I've seen actually work for borrowers trying to qualify.
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🔍 Also explore: All FRC Tools · Lender Routing · FHA by State · Lender Stress Index