Non-Occupant Co-Borrowers for Income Qualification: FHA 75% Rule, Fannie Mae DTI Treatment, and Relationship Requirements

A non-occupant co-borrower is someone who signs the mortgage note and is liable for repayment but does not live in the property. They exist to strengthen the qualifying borrower's income or credit profile. The rules differ significantly between FHA and conventional, and using the wrong approach for the deal type can result in a declined application or an incorrect loan structure.

FHA Non-Occupant Co-Borrower Rules

FHA permits non-occupant co-borrowers without restriction on eligible relationship when the LTV is at or below 75%. When the LTV exceeds 75%, FHA requires the non-occupant co-borrower to be a family member (related by blood, marriage, or legal adoption). This means a borrower using a non-family co-borrower (such as a friend or business partner) to get above 75% LTV is not eligible; they must either reduce the LTV to 75% or use a family member. FHA does not restrict the number of non-occupant co-borrowers but the qualifying income calculation includes all co-borrower income and all co-borrower liabilities.

Fannie Mae Non-Occupant Co-Borrower Rules

• ✦Fannie Mae allows non-occupant co-borrowers for primary residence purchases with no family relationship requirement
• ✦Maximum LTV is 95% when a non-occupant co-borrower is used on a standard conventional loan
• ✦All co-borrower income is eligible for qualifying; all co-borrower liabilities are included in DTI
• ✦HomeReady specifically allows non-occupant co-borrowers and is a preferred structure for parent co-signing for a child
• ✦Freddie Mac Home Possible also permits non-occupant co-borrowers at up to 97% LTV under certain conditions

Credit Contribution and Qualifying Score

When a non-occupant co-borrower is added to strengthen credit, the qualifying credit score is the lowest middle score among all borrowers on the loan, including the non-occupant co-borrower. If the occupying borrower has a 620 FICO and the co-borrower has a 780 FICO, the qualifying score is 620 (the occupying borrower's score). Adding a co-borrower with a higher credit score does not improve the qualifying FICO; it only helps if the co-borrower's score is being added to a borrower with no credit score at all. The value of the co-borrower is in income and reserves, not in credit improvement except in thin-file no-score scenarios.