Buying a 2–4 unit home you will live in

You occupy one unit. That is the whole requirement.

Every one of these programs allows two, three or four units with the borrower living in one of them. You do not have to occupy the largest unit, and you do not have to occupy it forever — but you do have to move in, and the intent has to be real at application.

• Conventional and FHA treat the property as a principal residence when you occupy a unit. Pricing, down payment and mortgage insurance all follow the owner-occupied grid.
• VA requires you to certify, at application and again at closing, that you intend to occupy the property as your home within a reasonable time after closing. The statute says reasonable time; in practice VA generally reads that as about 60 days, with longer periods allowed for a specific documented reason. Active-duty borrowers can satisfy occupancy through a spouse, and in certain cases a dependent child. VA eligibility covers who qualifies in the first place.
• VA also allows more than four units in one narrow case: the four-unit maximum increases by one additional unit for each additional eligible veteran participating in the purchase. Two eligible veterans buying together can finance five units.

The difference between this and investor financing is large. An investor buying the same fourplex is looking at 20% to 25% down and a rate premium, and is underwritten on the property rather than on themselves — our DSCR calculator shows that test. You are looking at 0% to 5% down at primary-residence pricing, because you are moving in. That gap is the entire reason people buy this way.

The 5% is real. Getting to it on a triplex or fourplex is another matter.

Two things stand between the rule and the closing table, and neither is the down payment.

Mortgage insurance has to be placed, and on 3–4 units it often cannot be

Any conventional loan above 80% loan-to-value needs private mortgage insurance, and the agencies require the same 30% coverage at 95% loan-to-value whether the property is a single-family house or a fourplex. Unit count does not change what is required. It changes who is willing to write it.

Reading the five major insurers’ published underwriting guidelines as they stand in early 2026: one will not insure a three- or four-unit primary residence at any loan-to-value. Two cap three- and four-unit properties at 90%. One writes them to 95%. One publishes a matrix with the cell left blank. Duplexes are a different story entirely — all five write a two-unit primary residence at 95%.

The reserve requirement is larger than the extra down payment

A 2–4 unit principal residence requires six months of reserves on a conventional loan — six months of the full payment, in verified assets, still there after closing. The automated system can require more. This applies to duplexes as much as to fourplexes, and it is where most of these files actually run out of room.

What to do about both

• Price the file at 90% as well as 95%. At 90% the mortgage insurance question largely goes away on three- and four-unit properties, the coverage requirement drops from 30% to 25%, and the premium falls. If you have 10% rather than 5%, the file gets materially easier and often cheaper.
• Ask for the mortgage insurance decision before the offer, not after the appraisal. A lender can run the scenario through the insurers it works with in a day.
• Lender-paid mortgage insurance is worth quoting on these files. It changes who has to approve the coverage and how the payment looks, and on a property you may refinance within a few years the arithmetic sometimes favors it.
• Reserves can come from retirement accounts in most cases, at a discounted value, without liquidating them. That single fact rescues more of these files than anything else on this list.
• Or use FHA. Lower down payment, lower reserve requirement, no private mortgage insurer to satisfy, and no automated-approval condition on the low down payment.

I would price a three- or four-unit file at both 90% and 95%. The 95% version can turn out to be unavailable for reasons that have nothing to do with you, and it is better to find that out while you still have both numbers in front of you.

Whether the projected rent counts depends on your history, not the property.

All three programs start from the same place: an appraiser completes a Small Residential Income Property Appraisal Report, known as Form 1025, giving market rent for each unit, and 75% of that rent is the figure in play. The other 25% is treated as vacancy and maintenance. What differs is what you have to bring before you are allowed to use it.

The conventional restriction, which took effect in January 2024

Conventional rules now sort borrowers into three cases on a 2–4 unit principal residence. If you have a current housing payment and at least a year of property management experience, there is no restriction. If you have a housing payment but no management experience, the rental income used in qualifying cannot exceed the property’s own full payment — a limit that rarely binds on an owner-occupied purchase. If you have no current housing payment at all, no rental income can be used.

That third case catches a specific and common buyer: someone living with family, paying nothing, saving hard, buying their first property. Under conventional rules the projected rent is worth nothing to them. Under FHA it is worth 75% of market rent. If that is you, read it alongside the first-time home buyer guide, because several of the programs there interact with this one.

The VA condition, which is regulation rather than overlay

Federal regulation says prospective rental income on a multi-unit property will not be considered unless the veteran can demonstrate a reasonable likelihood of success as a landlord, evidenced by prior experience managing rental units or other collection activities, and has verified cash reserves sufficient to carry principal, interest, taxes and insurance for at least six months without any help from the rent. The rule is written to catch any structure with more than one dwelling unit, so it applies to a duplex.

One FHA detail with real consequences: the net rent is added to your gross income. It may not be used to reduce the mortgage payment. Those two treatments produce different debt-to-income ratios from identical facts, and it is worth understanding which one your file is getting when you walk through the mortgage approval process.

The house you are moving out of is usually what the ratios turn on.

Most people buying a 2–4 unit are moving from somewhere, and often that somewhere is not sold yet. Whether its payment counts against you is frequently the single largest number in the file — larger than the projected rent, and larger than the down payment difference between two programs.

Conventional

Both payments count. If the current home is pending sale but will not close before the new loan, the existing payment and the proposed payment are both used to qualify. That doubles up unless you have an executed sales contract and confirmation that the buyer’s financing contingencies have been cleared — both, not either.

If you are keeping and renting the old house instead, the rent from it is subject to the same January 2024 test described above. The requirement many people still expect — 30% equity in the departing home plus six months of reserves — was removed in 2015 and no longer exists. What replaced it is the property management history requirement, which is a different question with different paperwork.

FHA

If the home you are leaving already has an FHA loan on it, start with two FHA loans at once, because holding both is the exception rather than the rule. FHA is also stricter about rent from a property you are vacating. Its standard requires that you be relocating more than 100 miles from your current principal residence, with a lease of at least one year and evidence that the security deposit or first month’s rent was paid. Separately, where there is no rental history on the property, FHA requires an appraisal showing market rent and at least 25% equity, and the handbook language naming that requirement expressly includes property being vacated by the borrower.

Whether those two requirements are cumulative or alternative is not stated as plainly as it should be, and lenders read it both ways. Assume the stricter reading until your lender confirms otherwise on your file.

VA

Proposed rent on a home you are vacating may be used to offset that property’s mortgage payment, provided there is no indication the property will be difficult to rent. It does not become income — it can bring the old payment down to zero in the ratios but never below it. Keeping the old house also has an entitlement consequence: entitlement is restored when the prior property is sold and the loan paid in full, or when a qualified veteran assumes it. Keep the house without paying off the loan and you buy on remaining entitlement, which is where a down payment can reappear on a VA purchase.

Because the departing property is so often decisive, I typically recommend qualifying as though the old payment counts. Treat any relief as upside. It is a far better position to be in than restructuring a pre-approval two weeks before closing, and if you are carrying two mortgages it is the number I would want settled first.

The qualifying rent is not a budget.

Every program in this article uses 75% of market rent. It is a fair underwriting convention and it is not a forecast of what you will keep. The 25% covers vacancy and maintenance in the abstract; it does not cover a furnace, a roof, a tenant who stops paying in month three, or the two months a unit sits empty between leases in January.

Some honest arithmetic on the fourplex above. Qualifying treats three rented units at $1,150 as $2,587.50 a month of usable rent. One unit vacant for two months costs $2,300. A water heater is $2,000. Those are ordinary years, not disasters, and they land on top of a payment the lender already counted you as able to make.

The other thing worth saying plainly: you are becoming a landlord. Screening tenants, handling repair calls, understanding your local ordinances and, at some point, dealing with someone who will not pay. Owner-occupied multi-unit property is one of the more reliable ways to build equity while housing yourself, and it is a job. Our rental return calculator models cash flow, and what APR really tells you is worth a read before comparing offers, since these files often carry more fees than a single-family purchase.

Compare it against the alternative you actually have, not against a spreadsheet. Our rent versus buy calculator is built for that comparison.

Four things this article will not pretend to be certain about.

• FHA reserves on a two-unit property. The three-month requirement for three- and four-unit properties is published clearly. A separate two-unit figure is not, and lender practice varies. Ask on your specific file.
• Whether FHA’s 100-mile relocation rule and its 25% equity requirement are cumulative for rent from a departing residence. The two requirements sit in different parts of the handbook and are read both ways. Plan for the stricter reading.
• Mortgage insurance pricing on three- and four-unit properties. All the major insurers moved to per-scenario pricing engines and none publishes a rate card. Expect an adjustment for unit count; the only way to know the number is to quote your file.
• VA occupancy timing. The statute says a reasonable time after closing. The commonly quoted 60 days is VA’s general interpretation rather than a fixed regulatory deadline, and documented exceptions exist.

Where guidance is genuinely unclear, the useful answer is what your lender and the investor buying the loan will actually do with it, on your file, this month. That is a question worth asking out loud rather than assuming.