No Rental History on Your FHA Duplex? Here's the 75 Percent Math Underwriters Actually Use
The Math Behind the Rule
75 percent. That's the figure buried inside FHA's rental income guidance that quietly determines whether a no-history multi-unit purchase qualifies or doesn't. If you're researching FHA financing on a two- to four-unit property and the unit you plan to rent has never generated income, this is the calculation that governs your file, and it's worth understanding before you're deep into underwriting.
Why "No Rental History" Changes the Calculation
When a unit already has a rental history, lenders can lean on tax returns or lease documentation showing actual collected rent. But a first-time buyer purchasing a duplex they'll partially occupy often has a unit that's never been rented at all. No Schedule E, no prior lease, nothing to document except what the market will likely support.
FHA addresses exactly this scenario. The guideline states: "For properties without rental history, the Mortgagee must use 75 percent of the lesser of: fair market rent reported by the Appraiser; or the rent reflected in the lease or other rental agreement." That's the whole calculation. Not the full rent, not an optimistic projection, but 75 percent of whichever figure is lower between the appraiser's fair market rent and any lease already in place.
Where the Appraiser Comes In
The FHA guideline also establishes that rental income may be considered Effective Income on a two- to four-unit dwelling or acceptable investment property in the first place. Once that's established, the appraiser's fair market rent figure becomes central for a no-history unit, since there's no lease yet to compare it against. Underwriting then adds this net rental figure, the 75 percent number, to the borrower's gross income to calculate total effective income.
A Common Scenario: The Owner-Occupant Buyer
A situation that comes up often involves a first-time buyer planning to live in one unit of a duplex and rent the other, with FHA financing and no existing lease on the rental side. Case in point: Aliza, a first-time buyer purchasing a duplex near Surfside Beach, SC, under this exact scenario. Her rental unit had no history, so the appraiser's fair market rent, reduced to 75 percent, was the number that had to work alongside her other income for the file to qualify.
Why This Matters Before You Submit an Offer
Buyers frequently size their offer, or their confidence in qualifying, around the full expected rent. That's a mistake with a no-history unit. The usable number is always smaller than the sticker rent, by design. Running this calculation before an offer is written, rather than after a contract is signed, avoids a mid-process surprise.
The Question to Bring to Your Lender
Before writing an offer on any two- to four-unit FHA purchase with an unrented unit, ask: "What is 75 percent of the lesser of the fair market rent and the lease rent on this property, and does my income still qualify at that number?" That single question forces the real math to the surface early.
Get Your Number Before You Offer
I'm Jason Sharon, a licensed mortgage broker with Home Loans Inc. If you're evaluating a multi-unit FHA purchase with no rental history on the property, call 843-LOW-RATE and I'll run the 75 percent calculation with you before you make an offer.
Equal Housing Opportunity. Home Loans Inc - Jason Sharon, Mortgage Broker. Company NMLS #1728740, Jason Sharon NMLS #1281448.