House hacking financing: FHA, VA, and conventional owner-occupied loans

House hacking works because the loan is cheaper when you live in the building. An owner-occupied mortgage on a duplex, triplex, or fourplex carries a lower down payment and a lower rate than the investment loan on the identical property next door, and that gap is the entire financial engine of the strategy. You move into one unit, rent the others, and the tenants' rent helps carry a mortgage you could never have qualified for as a pure investment. If house hacking as a concept is new, the overview of how it works and who it suits covers the lived-in side; this page is about the money.

Three loan types do almost all of the work: FHA, VA, and conventional owner-occupied. Most pages that rank for this topic are written by mortgage brokers, so the down payment looks easy and two details get skipped: the FHA self-sufficiency test that kills a lot of triplex and fourplex deals, and the exact rules on how much tenant rent you can count toward qualifying. This runs both with real numbers, states the occupancy rules plainly, and is honest about the cost you carry for the low down payment.

FHA: the 3.5% door, and its catch

FHA insures loans on one-to-four-unit properties at 3.5% down with a qualifying credit score, on the condition that you occupy one unit as your primary residence. The same program funds a single-family house and a fourplex, which is why FHA is the most common first move for a house hacker: $14,000 of down payment can put you into a $400,000 fourplex where you live in one unit and rent the other three.

The cost of that low down payment is the mortgage insurance premium, or MIP. FHA charges an upfront premium financed into the loan plus an annual premium paid monthly, and on a loan with less than 10% down the annual MIP runs for the life of the loan, not until you hit 20% equity. The exact MIP figures are set by HUD and change, so confirm the current upfront and annual rates against HUD Handbook 4000.1 rather than any number you read in a blog. Structurally, plan on a meaningful monthly add to the payment that does not fall off the way private mortgage insurance on a conventional loan eventually does.

The detail most pages skip is the self-sufficiency test, and it only applies to triplexes and fourplexes. FHA requires that 75% of the appraiser's estimated total market rent for all units, including the one you live in, cover the entire monthly payment: principal, interest, taxes, insurance, and MIP.

0.75 × total monthly market rent ≥ monthly PITI + MIP

Say you are buying a fourplex where the appraiser sets market rent at $1,300 per unit, so $5,200 a month across all four. Multiply by 75% and you get $3,900. If the full PITI plus MIP comes to $3,600, the property passes with room to spare. If you stretched into a building where the payment is $4,100, it fails, and FHA will not insure the loan no matter how strong your income is. The test exists to keep owner-occupant buyers out of buildings that cannot pay for themselves. Two-unit properties are exempt, which is one reason duplexes are the gentlest entry point.

VA: zero down for eligible buyers

If you are an eligible veteran, active-duty service member, or qualifying surviving spouse, the VA loan is the strongest house-hacking tool there is. It allows up to 100% financing on a one-to-four-unit property as long as you occupy one unit, with no monthly mortgage insurance at all. There is a one-time VA funding fee, which can be financed and is waived for some disabled veterans, but the absence of MIP or PMI makes the monthly payment lighter than the FHA equivalent on the same building.

VA does not impose the FHA self-sufficiency test, though the lender will still underwrite the deal and look at whether the rent supports the payment. Occupancy is the firm rule: you must intend to move in within 60 days and live there. The combination of zero down and no monthly insurance means an eligible buyer can house hack a fourplex with almost no cash in the deal, which is as close to a financing edge as this strategy offers.

Conventional owner-occupied: the higher-down, cleaner path

Conventional owner-occupied loans on two-to-four-unit properties have loosened. Some programs now allow as little as 5% down on a multi-unit primary residence, where it used to take 15% to 25%, which narrows the old gap with FHA. You pay PMI when you put less than 20% down, but PMI on a conventional loan can be removed once you reach roughly 20% to 22% equity, unlike the lifetime MIP on a low-down FHA loan.

The trade is usually a higher credit and reserve bar than FHA in exchange for insurance that eventually disappears, plus no FHA self-sufficiency test. For a buyer who can put down 5% to 15% with solid credit, the conventional route on a duplex can cost less over the years you hold it, precisely because the PMI comes off. Run both side by side on the actual building before you assume FHA is cheaper just because the down payment is.

Using rental income to qualify

The reason house hacking lets a modest income buy a fourplex is the rental-income credit. Lenders generally count 75% of the market or lease rent from the units you will not occupy toward qualifying, holding back 25% for vacancy and upkeep. That credited rent either adds to your income or offsets the housing payment, depending on the program, and it is what makes the debt-to-income math work on a building far larger than your salary alone would support.

Say the three rented units in a fourplex bring $1,300 each, or $3,900 a month. Lenders credit 75% of that, $2,925, against the payment. On a salary that would never qualify for the full mortgage on its own, that credit can be the difference between approval and a decline. The appraiser's rent estimate (Form 1007 or 1025) usually sets the figure, so the number is not yours to inflate. How lenders treat rental income gets deeper on your next purchase, after you have a track record, which is its own topic in how lenders count rental income. Before you fall in love with a building, confirm its rents are real using rent comps you pulled yourself, not the listing's hopeful numbers.

Occupancy is the rule you do not bend

Every loan on this page is priced low because you are the resident, and the rules enforce that. FHA and VA require you to move in within 60 days of closing and to occupy the unit for at least 12 months; HUD Handbook 4000.1 spells out the FHA occupancy requirement. Conventional owner-occupied loans carry a similar one-year expectation. These are not formalities. Signing as an owner-occupant while planning to rent the whole building is occupancy fraud, a federal offense that can trigger the loan's due-on-sale clause and worse. Competing posts get cavalier about move-out timing; do not. Plan to live there for the full term, and only then decide whether to stay, rent your unit too, or refinance into a non-owner loan. That twelve-month minimum is also the runway to house hack again: after a year of on-time payments and equity, an eligible buyer can sometimes repeat the move, restoring VA entitlement or moving on from the FHA property to the next one. The strategy compounds only if the first occupancy was honest.

The day you rent the other units, you are a landlord

The financing decision ends at the closing table, but the work starts the day the first tenant moves in. You now have rent to collect, a deposit to hold and itemize, and a tax return that has to split the building between the part you live in and the part you rent, because only the rented portion gets depreciated and deducted on Schedule E. That owner-occupied split is the recordkeeping wrinkle no mortgage page warns you about. Get the unit allocation right from month one and run the loan's payments correctly: only the interest is deductible, while principal and escrow are not, a distinction worked through in tracking mortgage interest, principal, and escrow.

This is the seam rents.ai is built for: it keeps the rent roll, the deposit ledger, and the Schedule E split for the rented units in one place, and it amortizes the loan into deductible interest, non-deductible principal, and escrow so the numbers match your real payments. What it will not do is find or price your loan, pull a rate, or tell you which lender to call; the financing choice stays entirely yours. Before you sign anything, run the rented side through a cash-on-cash calculator on the cash you are actually putting in, and read the wider guide to financing a rental property so the house hack is the first move in a plan, not the whole plan.