The fastest route from renter to landlord is often a building with two to four units: you live in one, and the tenants in the others help pay the mortgage. Because you live there, owner-occupant financing is on the table. FHA has three rules that decide whether the numbers work.
When you have no rental history on the property, FHA has the lender use 75 percent of the lesser of the appraiser's fair market rent and the rent in the lease. That net rent is added to your income. It is not subtracted from the mortgage payment, so your full payment still counts in your debt-to-income ratio.
For a two- to four-unit building the lender documents the rent with a small residential income property appraisal and, if available, the leases.
For a three- or four-unit property, FHA adds a self-sufficiency test. Take the appraiser's fair market rent for every unit, including the one you will live in, and subtract the greater of the appraiser's vacancy and maintenance estimate or 25 percent. The monthly payment divided by that figure may not exceed 100 percent.
Four units at $1,400 each: $5,600 in market rent.
Less 25 percent: $4,200 net self-sufficiency rent.
The test: principal, interest, taxes and insurance must be $4,200 or less.
A duplex does not face this test. That is one reason two-unit buildings are the most common first house hack.
For three- to four-unit properties, FHA requires reserves equal to three months of the mortgage payment left after closing. Reserves have to be your own verified liquid assets; borrowed money, equity in another property and cash back from the deal do not count.
Conventional loans treat two- to four-unit primary residences as eligible for subject-property rent too, with their own formula and the landlord-experience rule explained on rental income rules. To see how the count of financed properties works as you grow, read how many rentals you can finance.
From the source: HUD Handbook 4000.1, Update 17 (11/26/2025), II.A.1 Three- to Four-Unit Self-Sufficiency Rental Income and II.A.4 Rental Income from the Subject Property and Reserves (TOTAL); Fannie Mae B3-3.8-02 eligible property types. Lender overlays can be stricter. Not a commitment to lend.
Renting builds someone else's wealth. Owning a rental builds yours. Get the full book free and start your move today.
Jason is also a mortgage broker. Questions?(843) 569-7283 / 843.LOW.RATE