Second homes
A second home is for the borrower's personal use. It is not simply an investment property with a different label.
Personal use
Second-home eligibility depends on genuine borrower occupancy/use under the agency's rules. The property should function as a residence available to the borrower rather than primarily as a rental business.
Freddie
Freddie's Section 4201.12 governs second-home mortgages and requires the monthly payment on the second home to be included in DTI along with the housing expense on the borrower's current primary residence.
Manual underwriting
Freddie's current Exhibit 25 shows second homes as an LPA Accept execution rather than a standard manually underwritten occupancy category.
Official guide baseline
Fannie Mae Selling Guide · Freddie Mac Seller/Servicer Guide
Occupancy must reflect the borrower's actual intended use. Misrepresenting occupancy can constitute mortgage fraud.