The FHA self-sufficiency test, worked step by step

FHA’s self-sufficiency test says the rents on a three- or four-unit building have to cover the mortgage payment on their own. Take the appraiser’s market rent for every unit, yours included, knock off at least 25%, and the full monthly payment can’t be more than what’s left. A duplex doesn’t have to pass it.

It catches people out because it ignores your salary entirely. You can earn plenty and still fail.

The rule, in HUD’s words

HUD Handbook 4000.1 sets it out in three sentences (section II.A.1.b.iv(B)(3)(c), unchanged between Update 17 in November 2025 and Update 18 in August 2026):

• Net self-sufficiency rental income is “the Rental Income produced by the subject Property over and above the Principal, Interest, Taxes, and Insurance (PITI).”
• “The PITI divided by the monthly Net Self-Sufficiency Rental Income may not exceed 100 percent for three- to four-unit Properties.”
• It is “calculated by using the Appraiser’s estimate of fair market rent from all units, including the unit the Borrower chooses for occupancy, and subtracting the greater of the Appraiser’s estimate for vacancies and maintenance, or 25 percent of the fair market rent.”

Three details matter. The rents are the appraiser’s opinion, not the seller’s rent roll. Your own unit is counted at market rent. And 25% is a floor on the deduction, not a fixed number: if the appraiser thinks vacancy and maintenance run 30%, the test uses 30%.

A triplex that fails

Say you find a triplex for $600,000 and plan FHA with the minimum 3.5% down. The numbers below use an example rate of 6.5% over 30 years; use the rate you’re actually quoted. Taxes are $7,200 a year and insurance $2,400. The appraiser puts each unit at $1,800 a month.

Step	Amount
Base loan ($600,000 × 96.5%)	$579,000
Upfront MIP (1.75%), added to the loan	$10,132.50
Loan amount	$589,132
Principal and interest (6.5%, 30 years)	$3,723.71
Taxes ($7,200 ÷ 12)	$600.00
Insurance ($2,400 ÷ 12)	$200.00
Annual MIP (0.55% ÷ 12)	$270.02
Monthly payment (PITI with MIP)	$4,793.73
Market rent, 3 units × $1,800	$5,400
Less 25%	-$1,350
Net self-sufficiency rent	$4,050
PITI ÷ net rent	118.4%

It fails by $744 a month. The annual MIP rate is 0.55% because the base loan is under $726,200 and the loan-to-value is above 95%, per the chart in the handbook’s Appendix 1.0 (the rates HUD set in Mortgagee Letter 2023-05).

We’ve counted the monthly MIP inside PITI. The handbook’s list of what makes up the borrower’s total mortgage payment includes mortgage insurance, so that’s the cautious way to run it. If a lender runs the test without MIP, this deal is still at 111.7%.

Four changes, and which ones get it to pass

Higher rents

To pass at a $4,793.73 payment, net rent has to be at least that much, so gross market rent has to be $4,793.73 ÷ 0.75 = $6,391.64, or about $2,131 per unit. If the appraiser’s rent survey supports that, it passes. If it doesn’t, arguing with the seller’s projected rents won’t help, because the appraiser’s figure is the one that counts.

A lower price

At $480,000 with the same rents, taxes and insurance, the base loan is $463,200, the loan with upfront MIP is $471,306, and the payment comes to $3,994.99. That’s 98.6% of $4,050. It passes, barely. (In practice taxes on a cheaper building may be lower too, which helps.)

More cash down

At $600,000 with 20% down, the base loan is $480,000 and the annual MIP drops to 0.50% for 11 years, because the loan-to-value is 90% or less. The payment is $4,090.52, which is 101.0% of $4,050. Still a fail by $40 a month, which shows how hard the test is to clear with cash alone at this rent level. A slightly lower price or slightly higher appraised rent would get it there.

Four units instead of three

The same $600,000 price with a fourth $1,800 unit gives $7,200 of market rent and $5,400 net. The payment hasn’t changed, so the ratio falls to 88.8% and it passes with room. A fourplex at the same price as a triplex is the easiest pass, but those are rare; usually a fourth unit costs more.

What the test doesn’t do

It isn’t the only hurdle. You still have to qualify on income, with 75% of the rent from the units you don’t live in counted as income (FHA uses 75% of the lower of the appraiser’s market rent and the lease). On three and four units, FHA also wants three months of PITI in reserves after closing: $14,381 on the failing example above.

And it’s an FHA rule. The Fannie Mae and VA rules for a 2-4 unit you live in don’t include it (VA has its own residual-income test instead), so a triplex that fails FHA’s test is worth pricing as a conventional loan. The comparison guide goes through that trade.

Try your own building in the calculator: it runs this test as you type, and shows the rent per unit you’d need to pass.

Sources

• HUD Handbook 4000.1, Update 18, issued August 12, 2026: self-sufficiency (II.A.1.b.iv(B)(3)(c)), minimum investment (II.A.2.c.ii), reserves for 3-4 units (II.A.4.d.i(C)(2)), rental income (II.A.4.c.xii(I)), what the total mortgage payment includes, MIP chart (Appendix 1.0).
• HUD Mortgagee Letter 2023-05, annual MIP reduction, effective March 20, 2023.