How to Buy a Duplex and Rent It Out: Financing, Laws, and Taxes

You can buy a duplex and rent out one side by qualifying for an owner-occupant mortgage (FHA at 3.5% down, VA at zero down for eligible veterans, or conventional at 5% down), moving into one unit within 60 days of closing, and treating the other unit as a rental property with its own lease, insurance, and tax reporting. The rental income from the second unit helps cover the mortgage, which is why house-hacking a duplex is one of the most accessible entry points into real estate. The rest is execution: picking a property whose numbers work, closing on it, and meeting the legal obligations that kick in the moment you become a landlord.

Financing Built for Owner-Occupants

Three loan programs let you buy a two-unit property while living in one side. Each has a different down payment, credit floor, and set of trade-offs.

FHA Loans

FHA is the most common route for first-time duplex buyers. The down payment is 3.5% with a credit score of 580 or higher, or 10% with a score between 500 and 579. For 2026, FHA loan limits on a two-unit property range from $693,050 in lower-cost areas to $1,599,375 in high-cost markets.¹

Worth knowing before you worry about it: the FHA’s self-sufficiency test, which requires 75% of projected rent to cover the full mortgage payment, applies only to three- and four-unit properties.² Duplexes are exempt. Lenders will still count a portion of the expected rent when calculating your debt-to-income ratio, but there is no separate hurdle to clear.

VA Loans

Eligible service members and veterans can buy a duplex with zero down as long as the appraised value meets or exceeds the purchase price. The VA sets no minimum credit score, but most lenders want at least 620.³ You must intend to live in one of the units as your primary residence.

Conventional Loans

Fannie Mae now allows owner-occupants to buy a duplex with as little as 5% down, a meaningful drop from the previous 15-to-25% requirement.⁴ If you’re buying purely as an investment and won’t occupy the property, the older 15-to-25% range still applies. Conventional loans often carry lower rates for borrowers with strong credit and a larger down payment, so run the comparison against FHA before defaulting to either.

Debt-to-Income and Documentation

Your debt-to-income ratio is the biggest lever in how much you can borrow. Most lenders cap DTI at 43% for standard approval, meaning your total monthly debts, including the new mortgage, taxes, and insurance, can’t exceed 43% of gross monthly income. FHA’s automated underwriting can approve DTIs as high as 50 to 57% when the rest of the file is strong: cash reserves, a high credit score, a long employment history. The lender counts the full duplex payment, not half of it.

Have these ready before you apply: two years of federal tax returns (including Schedule E if you already have rental income), 30 days of pay stubs, two years of W-2s, and two months of statements for every bank account. Any large deposit that didn’t come from your paycheck needs a written explanation. Lenders want to see you can cover the down payment, closing costs, and several months of mortgage payments in reserve.

The Occupancy Rule You Can’t Ignore

FHA and VA loans come with occupancy strings, and they matter. FHA borrowers must move in within 60 days of closing and live in one unit as their primary residence for at least 12 months. VA borrowers get the same 60-day move-in window, and most lenders treat 12 months of occupancy as satisfying the VA’s intent-to-occupy requirement.³

Claiming you’ll occupy a property to get a lower down payment or better rate when you actually won’t is occupancy fraud, which federal agencies treat as mortgage fraud. Penalties can include criminal prosecution with prison time, restitution, fines, and probation.⁵ Once you’ve completed the one-year occupancy period, you’re generally free to move out and rent both units.

Picking a Duplex That Actually Pays

Confirm the Zoning

Before you get emotionally attached to a listing, confirm the property is legally zoned for two-unit residential use. Look for a multi-family or two-family designation on the local zoning map, often something like “R-2” or “MU” depending on the municipality. If a house was illegally converted into two units without approval, you can face fines or be forced to remove the second kitchen. Your city’s planning or zoning department can tell you the classification, usually for free.

Check the Utility Meters

Verify each unit has its own electric and gas meter. When tenants pay their own utilities, your operating costs drop. Older duplexes often share a single water meter, which forces you to either include water in the rent or use a ratio utility billing system to split the bill by unit size or occupancy. Shared meters create billing friction, so fully separated utilities produce better returns.

Run the Numbers Honestly

Net Operating Income tells you whether a duplex actually makes money. Research rents for comparable units within about a mile. Subtract all operating expenses: property taxes, insurance, a vacancy allowance of 5 to 8% of gross rent, and roughly 10% for ongoing maintenance and repairs. What’s left is NOI before mortgage payments. If that number barely covers the debt service, the deal is thin and one bad month puts you in the red.

One overlooked piece: property taxes are commonly reassessed after a sale based on the new purchase price, which can push your bill well above what the seller was paying. Estimate your future tax burden from the purchase price, not the seller’s current tax statement.

Reserve for Big-Ticket Repairs

Beyond routine maintenance, set aside money for the roof, HVAC, water heater, and appliances. A common approach is reserving 10% of monthly rental income for major replacements. Another is estimating the replacement cost of each major component and dividing by its expected lifespan to get an annual savings target. Skipping this is how new landlords end up financing an emergency roof replacement on a credit card.

From Offer to Keys

The Offer and Earnest Money

The transaction starts with a Purchase and Sale Agreement laying out your price, closing date, and contingencies for financing and inspection. Contingencies are your exit ramps: if the inspection turns up a cracked foundation or the bank won’t approve the loan, you can walk away without losing your deposit. Once both sides sign, the agreement is binding and escrow begins.

Earnest money, typically 1 to 3% of the purchase price, is due shortly after acceptance. It goes into an escrow account held by a neutral third party and gets credited toward your down payment at closing.

Appraisal and Inspection

Your lender orders an appraisal on Form 1025, the standard form for small residential income properties with two to four units.⁶ The appraiser evaluates condition, compares recent duplex sales, and estimates market rent for both units. If the appraisal comes in below your purchase price, you’ll either cover the gap out of pocket, renegotiate, or use your financing contingency to walk.

A separate home inspection covers what the appraiser doesn’t dig into: roof, foundation, plumbing, electrical, and HVAC in both units, plus smoke and carbon monoxide alarms for code compliance. The findings give you leverage to negotiate repairs or a price reduction before closing.

Closing

Your lender must deliver the Closing Disclosure at least three business days before closing.⁷ Compare it line by line against your original Loan Estimate. A title company or escrow officer runs a title search to confirm no liens threaten your ownership. Do a final walkthrough within roughly 24 hours of closing to confirm nothing has changed since the inspection. At the table, you sign the disclosure, the deed transfers, and the county records you as the new owner.

Insurance When You Live in Half and Rent the Other

A standard homeowner’s policy covers the unit you live in. The rented unit needs a landlord policy, usually written on the DP-3 form. A DP-3 covers the rental structure and loss of rental income if the unit becomes uninhabitable, but liability coverage and medical payments for injuries on the rental side are typically optional add-ons rather than standard inclusions. Your tenant’s personal belongings aren’t covered by your policy at all, which is why requiring renter’s insurance in the lease is smart practice.

An umbrella policy adds liability protection above what your homeowner’s and landlord policies provide. If a tenant or visitor is injured and damages exceed your landlord policy’s liability limit, the umbrella covers the excess. Qualifying usually requires minimum liability limits on your underlying policies, often $300,000 or more. For a duplex owner living next door to a tenant, the cost is modest relative to the protection.

What You Owe Tenants Once You’re a Landlord

Lead-Based Paint Disclosure

If your duplex was built before 1978, federal law requires you to give tenants an EPA-approved pamphlet about lead hazards and a disclosure form documenting any known lead-based paint before they sign the lease.⁸ Both parties sign, and you keep a copy on file for at least three years.⁹ The penalty for skipping this is up to $22,263 per violation as of the most recent federal adjustment, and tenants can sue for triple damages.¹⁰

Fair Housing

The Fair Housing Act prohibits discrimination based on race, color, religion, sex, national origin, familial status, or disability.¹¹ It reaches your listing language, your screening process, and your lease terms. Every applicant must be evaluated using the same criteria. The administrative penalty for a first violation is $26,262, with higher fines for repeat offenses.¹⁰ Living next door in the other unit does not exempt you.

Screening and the FCRA

When you pull a credit report or background check through a screening service, the Fair Credit Reporting Act takes over. If you deny an applicant based partly or fully on that report, you must send an adverse action notice that includes the screening company’s name and contact information, a statement that the company didn’t make the decision, and a notice of the applicant’s right to dispute inaccurate information and get a free copy of the report within 60 days.¹² Many small landlords miss this because they don’t realize screening triggers the obligation.

A common income benchmark is requiring gross income of at least three times monthly rent. It isn’t a legal requirement, and applying it consistently to every applicant is what keeps you on the right side of Fair Housing rules. Call previous landlords directly; the two questions that reveal the most are whether the tenant paid on time and whether the landlord would rent to them again.

Habitability and Local Registration

Every state recognizes some version of the implied warranty of habitability. The unit must have working plumbing with hot and cold water, functioning heat and electricity, a weatherproof structure, and safe entry and exit. Let those systems fail without prompt repair and tenants can withhold rent, break the lease, or sue for damages depending on the jurisdiction.

Many cities also require landlords to register the rental or obtain a rental license, sometimes after a safety inspection. Annual fees typically range from under $50 to a few hundred dollars. Operating without registration can trigger daily fines and, in some places, block you from using the courts to evict a non-paying tenant. Check with your municipality before the first tenant moves in.

The Lease and Move-In Documentation

Your lease should cover the term, monthly rent, payment due date, late fees (some jurisdictions cap them), security deposit amount and return timeline, maintenance responsibilities, and rules for shared spaces like yards or driveways. Security deposit limits vary widely: some states cap them at one month’s rent, others allow up to three, and roughly half impose no statutory cap. State law also dictates how quickly you must return the deposit after move-out.

A move-in checklist documenting the condition of every room, including walls, flooring, and appliances, protects both sides at move-out. Walk through together, note existing wear, sign and date the form, and take timestamped photos. Without it, justifying security deposit deductions later gets difficult.

Military Tenants and the SCRA

If your tenant receives military orders to deploy for 90 days or longer, or to permanently change stations, the Servicemembers Civil Relief Act lets them terminate the lease early without penalty. The tenant provides written notice and a copy of the orders. The lease ends 30 days after the next rent due date following delivery of that notice. You cannot charge an early termination fee, though the tenant remains responsible for unpaid utilities and damage beyond normal wear.

The Tax Side of Renting Half Your Home

Splitting Expenses on Schedule E

Rental income and expenses go on Schedule E of your tax return.¹³ Because you live in one unit and rent the other, shared expenses get split proportionally, usually by square footage or number of rooms. On a duplex with two roughly equal units, half of the mortgage interest, property taxes, and insurance goes on Schedule E as rental expense, and the other half goes on Schedule A as a personal deduction if you itemize.¹⁴

Deductible rental expenses include mortgage interest, property taxes, insurance, advertising, property management fees, and repairs and maintenance that keep the unit in operating condition.¹⁵ Fixing a broken lock or repainting a room is a deductible repair. Replacing an entire HVAC system or adding insulation is an improvement, which has to be capitalized and depreciated rather than deducted in the year you pay.¹³

Depreciation

The IRS lets you depreciate the rental portion of the building (not the land) over 27.5 years using the Modified Accelerated Cost Recovery System.¹⁴ Start with the purchase price, subtract the land value (using the ratio of assessed values if you’re unsure), then allocate the rental unit’s share. On a 50/50 duplex purchased for $400,000 with land worth $80,000, the depreciable rental basis is $160,000, yielding roughly $5,818 per year in depreciation. It’s a paper loss that reduces taxable rental income without costing you cash.

When You Eventually Sell

The unit you lived in may qualify for the capital gains exclusion of up to $250,000 for single filers or $500,000 for married couples. The rental unit is subject to capital gains tax plus depreciation recapture. One way to defer taxes on the rental portion is a 1031 like-kind exchange, reinvesting the proceeds into another investment property. Property used primarily as a personal residence doesn’t qualify for the exchange; only the portion held for investment or business use does.¹⁶

1
U.S. Department of Housing and Urban Development. HUD Federal Housing Administration Announces 2026 Loan Limits
2
U.S. Department of Housing and Urban Development. FHA Single Family Housing Policy Handbook
3
Veterans Benefits Administration. VA Home Loan Guaranty Buyer’s Guide
4
Fannie Mae. Eligibility Matrix
5
Federal Housing Finance Agency. Fraud Prevention
6
Fannie Mae. Appraisal Report Forms and Exhibits
7
Consumer Financial Protection Bureau. Closing Disclosure Explainer
8
Office of the Law Revision Counsel. 42 U.S. Code 4852d – Disclosure of Information Concerning Lead Upon Transfer of Residential Property
9
U.S. Environmental Protection Agency. Lead-Based Paint Disclosure Rule Fact Sheet
10
Federal Register. Adjustment of Civil Monetary Penalty Amounts for 2025
11
U.S. Department of Housing and Urban Development. Housing Discrimination Under the Fair Housing Act
12
Federal Trade Commission. Using Consumer Reports: What Landlords Need to Know
13
Internal Revenue Service. Instructions for Schedule E (Form 1040)
14
Internal Revenue Service. Publication 527 – Residential Rental Property
15
Internal Revenue Service. Tips on Rental Real Estate Income, Deductions and Recordkeeping
16
Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031