Freddie Mac's weekly survey put the average 30-year fixed rate at 6.69% as of August 6, 2026, up from 6.66% the week before and roughly in line with where it sat a year ago. That number alone pushes plenty of first-time buyers to the sidelines. It doesn't push out the ones willing to buy a duplex, triplex, or fourplex, move into one unit, and let tenants cover most of the note — because the loan program built for that move, the FHA's Section 203(b) multi-unit financing, still lets you in the door with 3.5% down and treats you as an owner-occupant, not an investor.
That's the pitch behind house hacking, and it's real. What doesn't get said enough is that the FHA doesn't hand out multi-unit loans on the strength of a good story. Buy a three- or four-unit property and an underwriter runs something called the self-sufficiency test against the appraiser's rent numbers before your loan ever clears — and a surprising share of deals that look great on a rent roll fail it cold. Here's what actually goes into qualifying, what it costs, and where the math tends to break.
What "House Hacking" Actually Requires From an FHA Loan
The FHA will insure a loan on a property with up to four units as long as you occupy one of them as your primary residence within 60 days of closing and stay there for at least a year. Credit and down payment follow the same two-tier structure as any other FHA loan: a 580 FICO score gets you the standard 3.5% down payment, while a score between 500 and 579 still qualifies but pushes the minimum down payment to 10%. Below 500, FHA won't insure the loan at any down payment.
- You must occupy one unit as your primary residence — this isn't a workaround for buying a pure rental with FHA terms.
- Debt-to-income generally needs to stay under 43%, though strong compensating factors (reserves, higher credit, lower housing-cost ratio) can push that ceiling.
- Gift funds can cover the entire 3.5% down payment at the 580+ tier, which is one reason house hacking attracts buyers who'd otherwise need years to save a 20% down payment on a comparable single-family home.
- The 10% minimum at the 500-579 tier has to come from the borrower's own funds or a verified gift, since most down payment assistance programs won't cover that tier.
Plenty of lenders won't actually go down to a 580 score, either. FHA sets the floor, but individual lenders apply their own overlays — 620 or 640 minimums are common — so the number on HUD's website and the number your loan officer quotes you can be two different things.
The 2026 Loan Limits That Set Your Ceiling
HUD raises FHA loan limits every year to track home-price appreciation, and 2026 is no exception. For a single-family home, the floor in most low-cost counties is $541,287, and the ceiling in the highest-cost markets reaches $1,249,125. Multi-unit limits scale up from there, and they're the number that actually matters once you're shopping duplexes and triplexes instead of single-family homes.
- Two units: $693,063 in a standard-cost county, up to $1,599,375 in a high-cost market.
- Three units: $837,720 standard, up to $1,933,200 high-cost.
- Four units: $1,041,138 standard, up to $2,402,625 high-cost — the ceiling that decides whether a fourplex in an expensive metro even qualifies for FHA financing at all.
Those ceilings are set at 115% of the local median home price in counties that fall between the national floor and ceiling, which means the real number for your target zip code could sit almost anywhere in that range — check the exact county limit before you fall in love with a listing. A fourplex priced at $1.1 million in a mid-cost Ohio county might exceed the local FHA limit even though it's well under the national high-cost ceiling.
The Self-Sufficiency Test That Kills Triplex and Fourplex Deals
Here's the part most first-time house hackers don't find out until the underwriter emails back.
None of this applies if you're buying a duplex. Add a third or fourth unit, though, and FHA requires what's officially called the Net Self-Sufficiency Rental Income test. An FHA-certified appraiser — not your lease agreements, not a rent estimate from Zillow — sets the market rent for every unit in the building, including the unit you plan to live in. Take 75% of that total rent, and the property passes when that figure is equal to or greater than the total monthly PITI (principal, interest, taxes, insurance, plus FHA mortgage insurance and any HOA dues). Miss that threshold and the loan doesn't close, full stop, regardless of how strong your personal income and credit look. Lenders don't have discretion to waive it, and neither does a compelling explanation letter — the test is arithmetic, not a judgment call.
The 25% haircut exists because HUD assumes vacancy and turnover will eat into rent collections at some point, and the agency isn't willing to insure a loan that only works if every unit stays rented year-round. That's a reasonable assumption in most markets, but it's brutal in high-price, low-rent metros where a $900,000 triplex might only support $4,200 in combined market rent. Run the math before you write an offer, not after the appraisal comes back.
Running the Numbers on a Triplex
Take a $650,000 triplex with 3.5% down, financed at something close to today's 6.69% average rate. The base loan amount comes to $627,250. FHA's upfront mortgage insurance premium adds 1.75% of that — $10,977 — which almost every borrower rolls into the loan rather than paying at closing, bringing the total financed balance to roughly $638,227. Principal and interest on that balance at 6.69% over 30 years lands around $4,110 a month. Add property taxes, insurance, and annual mortgage insurance, and total PITI comes out somewhere near $5,000 a month depending on the county's tax rate. For the property to pass the self-sufficiency test, the appraiser's combined market rent for all three units — including the one you'll live in — needs to be at least $6,667, since 75% of that figure clears the $5,000 PITI line.
Plenty of triplexes hit that number in Midwest and Sun Belt metros where three units can realistically rent for $2,200-$2,400 each. Just as many don't clear it, especially in coastal markets where a $650,000 purchase price buys a building whose combined rents top out closer to $5,500. That gap is exactly why triplex and fourplex house hacking tends to work best in mid-cost metros rather than the highest-priced coastal markets, even though the loan limits in those coastal markets are technically higher.
Duplexes Play by Easier Rules
A duplex skips the self-sufficiency test entirely, which is the single biggest reason first-time house hackers gravitate toward two-unit properties over three- or four-unit buildings. Underwriting treats a duplex purchase closer to a standard single-family FHA loan: your income and credit carry the file, and while the lender can still count a portion of the second unit's projected rent toward qualifying income, there's no pass/fail rent test standing between you and closing.
Buy the duplex over the fourplex if you're a first-timer testing the strategy out. The lower unit count means less tenant turnover to manage while you're learning landlord basics, the qualification path is simpler, and you're not betting an entire closing on an appraiser's rent opinion. Save the triplex and fourplex plays for a second or third house hack once you've got a year of landlord experience and a clearer read on which local submarkets actually clear the 75% test.
The Mortgage Insurance Bill Nobody Budgets For
FHA mortgage insurance is where a lot of house-hacking math quietly falls apart. Every FHA loan carries the 1.75% upfront premium described above, plus an annual premium of 0.55% of the loan balance for borrowers at the standard 3.5% down payment, dropping to 0.50% with at least 5% down. On the $638,227 financed balance from the triplex example, that annual premium runs about $3,510 a year, or roughly $293 a month — money that doesn't build equity and doesn't come off the PITI figure the self-sufficiency test is measuring against.
Whether that premium ever goes away depends entirely on your down payment. Put down 10% or more and annual MIP cancels automatically after 11 years. Stick with the standard 3.5%, though, and it rides along for the life of the loan — the only way off is refinancing into a conventional mortgage once you've built enough equity, which for most house hackers means waiting on a mix of paydown and appreciation. Budget for that premium as a permanent line item, not a temporary one, unless you're planning the larger down payment from day one.
When the Math Doesn't Work
Don't force a triplex or fourplex through the self-sufficiency test by low-balling your own future comfort — some buyers push the appraiser toward a higher rent estimate by furnishing comps that assume a fully renovated unit they haven't actually renovated yet, and then spend the first year scrambling to make the real rents match the number on the loan file. That's a worse position than walking away from a deal that doesn't clear the test on its own. A property that passes comfortably, with market rent running 10-15% above the bare 75% threshold, gives you room for a vacancy month or a slow-paying tenant without missing your own mortgage payment.
Rates near 6.7% make the spread between "barely passes" and "comfortably passes" matter more than it did when 30-year money was cheaper. Run the self-sufficiency math against the actual county loan limit and a conservative rent estimate before you write an offer — the underwriter will run the same math later, with less patience for optimistic assumptions than you had when you fell for the listing photos.