Using Rental Income to Buy a Duplex, Triplex, or Fourplex

Start with occupancy and legal unit count

Tell us which unit you will occupy and how the other units are used. A duplex, an accessory dwelling unit, and rooms rented inside a house can follow different rules. The legal property description and appraisal need to support the proposed financing.

Buying an investment property without living there is a different occupancy category. Use the intended arrangement from the beginning rather than choosing the label that appears to qualify for the largest loan.

Use the program’s rental calculation

Fannie Mae permits eligible rental income from two- to four-unit principal residences. Its current rental guidance addresses documentation, current housing expense, rental history, and qualifying calculations. Ask which provisions apply to your purchase.

A vacancy or expense allowance may reduce the rent used in underwriting. The exact calculation should come from the program and supported rent documentation, not a blanket rule applied to every mortgage.

Review the whole property budget

Separate your required mortgage payment from the property’s day-to-day operating budget. Repairs can affect several units at once, and a vacant unit still leaves expenses to pay.

If an FHA loan is being considered, ask for a separate property and rental-income review. A result under one conventional program does not establish eligibility under FHA.

Prepare for the review

• Provide the property address and legal unit count.
• Identify your intended unit and existing tenant leases.
• Collect tax, insurance, utility, and maintenance information.
• Plan cash reserves for repairs and interrupted rent.

Sources and program details

These references support the program details discussed above. The program selected for your loan and its current requirements control your application.

• Fannie Mae: general rental-income guidance