Investment Strategy
House Hacking: Buy a 2-4 Unit, Live in One, Rent the Rest
The lowest-barrier way into real estate investing — owner-occupied financing rules, the FHA self-sufficiency test, and a calculator for your real net housing cost.
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How House Hacking Works
The core idea: your tenants help pay your mortgage, while you still get the financing terms of a primary residence, not an investment property.
Owner-Occupied Financing
Because you live in one unit, you qualify for the same low-down-payment programs available to any homebuyer — not the 20-25% down typically required for a pure investment property loan.
Rental Income Offsets Your Payment
Rent collected from the other units goes directly toward your mortgage, taxes, and insurance — often reducing your real housing cost to a fraction of a comparable apartment rent, or to zero.
A Repeatable Strategy
After the required occupancy period (commonly 12 months), many house hackers move out, convert their unit to a rental, and repeat the process with a new property — building a portfolio one owner-occupied purchase at a time.
Financing Options
This is where house hacking's real advantage lives — access to financing terms an investor loan simply doesn't offer.
Most Common
FHA
3.5% down on 2-4 unit properties when you occupy one unit. The most accessible entry point, though 3-4 unit purchases must pass the self-sufficiency test described below.
No Test Required
Conventional
Commonly around 5% down on owner-occupied 2-4 unit properties. No self-sufficiency test, but typically higher rates and stricter reserve requirements than FHA.
For Veterans
VA
0% down on 2-4 unit properties for eligible veterans who occupy one unit — the strongest terms available, when eligible.
Underwriting Detail
75% Rental Income Credit
Most lenders count 75% of the market rent from non-owner units toward your qualifying income, treating the remaining 25% as a vacancy and maintenance allowance.
The Self-Sufficiency Test
The single most important underwriting detail that catches first-time house hackers off guard on 3-4 unit properties.
What It Requires
For FHA loans on 3-4 unit properties, 75% of the total market rent for every unit — including the one you'll live in, valued at market rate — must equal or exceed the full monthly mortgage payment.
Duplexes Are Exempt
This test applies only to 3-4 unit purchases. A 2-unit (duplex) FHA purchase does not face this requirement, which is one reason many first-time house hackers start with a duplex.
It Can Kill a Deal
If a property doesn't pass this test, FHA financing cannot close on it — regardless of the buyer's personal income or credit. Screen this before writing an offer on any 3-4 unit property, not after.
Choosing the Right Property
More units means more rental income potential, but also more underwriting complexity and more to manage while you live on-site.
Duplex (2 Units)
Simplest financing path — no self-sufficiency test, widely available inventory, and a manageable first step into managing tenants while living close by.
Triplex / Fourplex (3-4 Units)
More rental income potential per property, but must clear the self-sufficiency test, and means managing multiple tenant relationships as a new landlord simultaneously.
Self-Managing While On-Site
Living in the building makes hands-on management genuinely easier — you're already there for most maintenance calls — but also means less separation between your home life and your landlord responsibilities.
House Hacking Calculator
Enter your numbers below to see your real net housing cost after rental income, plus a quick self-sufficiency test check for 3-4 unit deals.
Want to run the full investment math — cap rate, DSCR, cash-on-cash — once you've moved out and converted the property to a full rental? Our Deal Screener picks up right where this leaves off.
Open the Deal Screener →
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Quick-Reference Glossary
| Term | Meaning |
|---|---|
| Owner-Occupied | A property where the borrower lives in one unit as a primary residence — required for house-hacking financing. |
| Self-Sufficiency Test | FHA's rule for 3-4 unit properties requiring 75% of total market rent to cover the full mortgage payment. |
| PITI | Principal, Interest, Taxes, and Insurance — the components of a full monthly mortgage payment. |
| DTI | Debt-to-Income ratio — a lender's measure of your monthly debt obligations against your income. |
| 75% Rental Credit | The portion of market rent lenders count toward qualifying income, with 25% reserved for vacancy/maintenance. |
Frequently Asked Questions
What is house hacking?
Buying a 2-4 unit property, living in one unit as your primary residence, and renting out the others. The rental income offsets some or all of your own housing payment, while you still qualify using owner-occupied financing rather than investor loan terms.
How much down payment do I need to house hack?
FHA allows 3.5% down on 2-4 unit properties when you occupy one unit. Conventional owner-occupied financing on a 3-4 unit property commonly requires around 5% down. VA loans allow 0% down on 2-4 units for eligible veterans who occupy one unit. All of these are substantially lower than the 20-25% down typically required for a pure investment property loan.
What is the FHA self-sufficiency test?
For 3-4 unit FHA purchases only (not duplexes), the lender must confirm that 75% of the property's total market rent, including your own unit at market rate, equals or exceeds the full monthly mortgage payment. If a property doesn't pass this test, it can't close with FHA financing, regardless of the buyer's personal income.
How much rental income counts when I apply for a mortgage?
Most lenders, including FHA and conventional guidelines, count 75% of the market rent from non-owner units toward your qualifying income, with the remaining 25% treated as a vacancy and maintenance allowance. This can meaningfully reduce the personal income needed to qualify.
How long do I have to live in the property?
Owner-occupied loan programs generally require you to occupy the property as your primary residence for at least 12 months. After that period, many house hackers move out, convert the unit to a rental, and repeat the process with a new property.
