To invest in a duplex as a rental property, you choose a loan based on whether you’ll live in one unit, verify the numbers hold up after a realistic expense accounting, close with the right contingencies in place, and then handle the tax reporting and landlord duties that come with renting half of what you own. The loan you pick drives everything else, because it sets your down payment, your insurance costs, and how fast you can repeat the move on a second property.
Pick the Loan Before You Pick the Property
The single biggest fork in duplex financing is occupancy. If you live in one unit, government-backed loans open up with low down payments. If you treat the whole building as an investment, you’re on conventional financing with far more cash required up front.
FHA for Owner-Occupants
An FHA-insured loan lets you put down as little as 3.5 percent with a credit score of 580 or higher. Scores from 500 to 579 still qualify, but the minimum down payment rises to 10 percent.1FDIC. 203(b) Mortgage Insurance Program You have to live in one of the units as your primary residence.
FHA loans carry mandatory mortgage insurance: an upfront premium of 1.75 percent of the base loan amount at closing, plus an annual premium between 0.80 and 1.05 percent depending on loan-to-value and loan size.2HUD. Appendix 1.0 – Mortgage Insurance Premiums On a loan above 90 percent LTV with a term longer than 15 years, that annual premium stays for the life of the loan. Price it into your cash flow before deciding FHA is the cheap option.
For 2026, FHA loan limits on a two-unit property run from $693,050 in standard-cost areas up to $1,599,375 in high-cost markets.3HUD. HUD Federal Housing Administration Announces 2026 Loan Limits If the duplex you want exceeds the limit in your county, you’ll need conventional financing or a larger down payment to close the gap. The FHA caps back-end DTI at 43 percent for most borrowers, with higher ratios allowed if you bring compensating factors like strong reserves.
VA for Veterans and Service Members
Veterans and active-duty service members can buy an owner-occupied duplex with no down payment through a VA-backed purchase loan, as long as the sale price doesn’t exceed the appraised value.4Veterans Affairs. Purchase Loan There’s no monthly mortgage insurance. There is a one-time VA funding fee: first-time users putting nothing down pay 2.15 percent of the loan amount, and that fee can be rolled into the loan rather than paid in cash at closing.5Veterans Affairs. VA Funding Fee and Loan Closing Costs Veterans with service-connected disabilities are exempt from the funding fee.
Conventional for Everyone Else
Fannie Mae and Freddie Mac conventional loans work for both owner-occupants and pure investors, but the numbers diverge sharply. Live in one unit, and the minimum down payment on a two-unit property is 5 percent. Buy it strictly as an investment, and the minimum is 25 percent.6Fannie Mae. Eligibility Matrix On a $400,000 duplex, that’s $20,000 versus $100,000 at the closing table.
Fannie Mae requires a minimum credit score of 620 for fixed-rate conventional loans and 640 for adjustable-rate mortgages on manually underwritten files.7Fannie Mae. General Requirements for Credit Scores Below 620, pricing adjustments get steep fast. If you put less than 20 percent down, you’ll pay private mortgage insurance, but you can request removal once equity reaches 20 percent. Investors putting 25 percent down carry no PMI at all.
The Rental Income Haircut
Whatever loan you use, lenders won’t credit you with the full rent the second unit produces. Fannie Mae’s rule is to multiply gross monthly rent by 75 percent, treating the other 25 percent as lost to vacancy and maintenance.8Fannie Mae. Rental Income A unit renting for $1,600 contributes $1,200 toward your qualifying income. If you’re close to the DTI line, that haircut can push you over it.
Get pre-approved before you tour anything serious. In competitive markets, sellers routinely ignore offers without a pre-approval letter attached.
Making the Numbers Work
A duplex that looks great on a listing can bleed cash once every real expense goes on paper. This is where you decide whether to keep looking.
What the Rent Will Actually Be
Start with what each unit can earn in the current market. Look at recently leased two-unit properties in the immediate neighborhood, not citywide averages that hide block-by-block variation. If the duplex already has tenants, read the existing leases, then verify those rents against market comps. A below-market lease inherited from a prior owner drags your returns until it expires.
What It Costs to Hold
Pull the property tax assessment from county records and check recent reassessment trends. Get insurance quotes written for a landlord-occupied or investor-owned duplex, not a standard homeowner policy. Water, sewer, and trash often stay with the owner on a duplex, so request the prior year’s utility bills. Add it all up alongside the mortgage payment before you sign anything.
Cash Flow and Reserves
Subtract operating expenses and the projected mortgage payment from your 75-percent-adjusted rental income. Positive means the property carries itself; negative means you’re subsidizing it every month. Then set aside five to ten percent of gross income as a capital expenditure reserve for the roof, HVAC, and water heater failures that will eventually arrive. Skipping that reserve is how landlords end up funding emergency repairs on credit cards.
Zoning and Title
Confirm the property is legally zoned for multi-unit residential use. Some older duplexes exist as legal non-conforming uses, built before the area was rezoned for single-family. That status usually allows continued operation but can restrict major renovations or rebuilding after significant damage. Check local codes for short-term rental restrictions or occupancy limits that could affect your plans, and review public land records for easements or liens.
The Offer and the Closing
Once a duplex pencils out, you submit a purchase agreement stating your price, proposed closing date, and the contingencies that let you exit if specific conditions aren’t met. Earnest money of one to two percent of the price goes into escrow and credits toward your down payment at closing.
Three contingencies carry most of the weight on a duplex:
- The inspection contingency gives you a negotiated window, commonly seven to fourteen days, to have a professional examine the foundation, electrical, plumbing, and structural systems in both units. Serious defects let you renegotiate or walk with your deposit.
- The appraisal contingency protects you if the lender’s independent appraisal comes in below the purchase price. You can renegotiate, cover the gap in cash, or terminate.
- The financing contingency, typically running 30 to 60 days, protects your deposit if your loan falls through despite pre-approval.
Waiving contingencies to sharpen an offer is a gamble that sometimes pays off in hot markets, but on a two-unit building the inspection contingency is almost always worth more than the competitive edge dropping it buys. Twice the living units means twice the surface area for hidden problems.
After the contingencies clear, a title company or real estate attorney searches the title for liens, unpaid taxes, and ownership disputes. You’ll receive a closing disclosure at least three business days before closing, itemizing origination charges, title insurance, recording fees, prepaid property taxes, and prorations. At closing you sign the mortgage note and the security instrument, funds disburse to the seller, the deed records, and the property is yours.
Taxes Once You Own It
Rental ownership opens real tax advantages, but only if you report it correctly.
Schedule E
You report rental income and deductible expenses for the tenant-occupied unit on Schedule E of your federal return.9Internal Revenue Service. About Schedule E (Form 1040), Supplemental Income and Loss Deductible expenses include mortgage interest, property taxes, insurance, repairs, and property management fees allocated to the rental unit. In a standard duplex where you occupy one side and rent the other, roughly half of shared expenses is deductible against rental income. Costs that apply only to the rental unit, like a tenant-requested repair, are fully deductible.
Depreciation
The IRS lets you depreciate the rental portion of the building’s structure over 27.5 years using MACRS.10Internal Revenue Service. Publication 527, Residential Rental Property Land isn’t depreciable, so you allocate your purchase price between land and structure based on the tax assessment or an appraisal. The annual depreciation deduction often creates a paper loss that reduces taxable rental income even when the property is cash-flow positive. There is a catch at sale, discussed below.
Passive Loss Limits
Rental income is generally passive, so losses only offset other passive income. If you actively participate in managing the property, you can deduct up to $25,000 of rental losses against regular income.11Office of the Law Revision Counsel. 26 U.S. Code 469 – Passive Activity Losses and Credits Limited That allowance phases out as modified adjusted gross income rises above $100,000 and disappears entirely at $150,000.12Internal Revenue Service. Publication 925, Passive Activity and At-Risk Rules Losses you can’t use carry forward until you can, or until you sell.
When You Sell
The owner-occupied unit may qualify for the Section 121 capital gains exclusion: up to $250,000 of gain for a single filer or $500,000 for a married couple filing jointly, if you owned and lived in that unit for at least two of the five years before the sale.13Office of the Law Revision Counsel. 26 USC 121 – Exclusion of Gain from Sale of Principal Residence The rental unit doesn’t qualify. You allocate the gain between the two units, and the rental portion is taxable.14Internal Revenue Service. Publication 523, Selling Your Home
Every dollar of depreciation you claimed, or could have claimed, on the rental side gets recaptured at sale as unrecaptured Section 1250 gain, taxed at up to 25 percent. The depreciation deduction is a deferral, not a gift. Many duplex owners use a 1031 exchange to defer both capital gains and depreciation recapture by rolling proceeds into another qualifying property.
Landlord Rules That Apply From Day One
Renting out half of your duplex makes you a landlord under federal law, with disclosure and anti-discrimination duties that attach regardless of location.
Lead Paint on Pre-1978 Buildings
If the duplex was built before 1978, federal law requires you to give tenants an EPA-approved pamphlet on lead-based paint hazards, disclose any known lead paint, and share any available lead inspection reports before the lease is signed.15Office of the Law Revision Counsel. 42 U.S. Code 4852d – Disclosure of Information Concerning Lead Upon Transfer of Residential Property The lease must include a lead warning statement signed by the tenant, and you have to keep copies of the disclosures for at least three years.16U.S. Environmental Protection Agency. Lead-Based Paint Disclosure Rule Fact Sheet You don’t have to test for or remove lead paint, only share what you know. Contractors doing renovations on a pre-1978 property must be EPA-certified under the Renovation, Repair, and Painting Rule.17eCFR. Subpart E – Residential Property Renovation
Fair Housing
The Fair Housing Act prohibits discrimination based on race, color, religion, sex, national origin, familial status, and disability. Owner-occupied buildings with four or fewer units have a limited exemption from some provisions under what’s commonly called the Mrs. Murphy exemption.18Office of the Law Revision Counsel. 42 U.S. Code 3603 – Effective Dates of Certain Prohibitions As a duplex owner-occupant, it technically covers you for certain tenant-selection decisions, but it does not permit discriminatory advertising, and many state and local fair housing laws provide no such exemption. Screen tenants using consistent, documented financial criteria and treat the exemption as if it isn’t there.