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Enter property details, financing, and rental income to see your effective monthly housing cost and how much tenants cover.
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What Is House Hacking?
House hacking is a real estate investment strategy where you buy a multi-unit property (duplex, triplex, or fourplex), live in one unit, and rent out the others. Your tenants' rent payments offset your mortgage, reducing or even eliminating your housing cost entirely. It is one of the most accessible paths into real estate investing because you can use owner-occupied financing like FHA loans with as little as 3.5% down.
The concept is straightforward: instead of paying 100% of your housing cost yourself, you share the expense with tenants who live in the other units. A duplex owner who charges $1,500/month rent from the other unit and has a $2,400/month mortgage payment effectively pays only $900/month to live there — a 62% reduction in housing cost.
House hacking works especially well in markets where multi-unit properties are priced similarly to single-family homes but generate significantly more income. The strategy builds wealth through three channels simultaneously: reduced living expenses (cash you keep), equity building (principal paydown from the mortgage), and property appreciation over time. Many investors use their first house hack as a stepping stone — after one year of occupancy (FHA requirement), they move to a new property and repeat the process, building a portfolio while keeping their personal housing cost near zero.
How to Use This Calculator
Enter Property Details
Purchase price, number of units (2/3/4), and property type. The number of units determines how many rent fields appear.
Set Financing Terms
Down payment (3.5% for FHA), interest rate, loan term, and PMI. FHA loans require mortgage insurance for the life of the loan.
Enter Rental Income
Monthly rent for each tenant-occupied unit or total monthly income. Include a vacancy rate (5% is standard) to account for turnover.
See Your Results
The calculator instantly shows your effective housing cost, tenant coverage percentage, and how much you save vs renting.
The Core Formula
Three calculation modes
Real-World Example: Denver, CO — Duplex House Hack
Based on illustrative Denver metro data for a 1970s-built duplex
Property & Financing
Result
Your Effective Housing Cost
$2,224/mo
Tenants cover 49% of total costs
If you were renting a comparable apartment for $1,900/mo, you would save $−324/mo in cash flow — but you are building ~$3,600/yr in equity. Total first-year benefit: ~$3,600 in equity alone, plus the property appreciation. After year 2-3 when you can raise rents, coverage often reaches 60%+.
FHA Loan Requirements for House Hacking
FHA loans are the most popular financing vehicle for house hackers because they allow just 3.5% down on properties up to 4 units. However, there are specific requirements you need to meet. Understanding these upfront prevents surprises during underwriting and ensures your house hack closes on time.
Owner Occupancy
You must move into one unit within 60 days of closing and live there as your primary residence for at least 12 months. After one year, you can move out and keep the FHA loan in place.
3.5% Down Payment
Minimum 3.5% down with a 580+ credit score. For scores 500-579, you need 10% down. This applies to 1-4 unit properties when owner-occupied.
Mortgage Insurance Premium (MIP)
FHA requires both an upfront MIP (1.75% of loan, usually rolled into the loan) and annual MIP (~0.85% of loan balance). Unlike conventional PMI, FHA MIP lasts for the life of the loan if you put less than 10% down.
Self-Sufficiency Test (3-4 Units)
For triplex and fourplex properties, FHA requires that 75% of the total rental income (including your unit at market rent) covers the full PITI. This test does not apply to duplexes.
DTI Ratio
FHA allows up to 56.9% DTI in some cases, but most lenders cap at 43-50%. Rental income from the other units can offset your mortgage payment in DTI calculations — typically 75% of projected rent is counted.
Loan Limits
FHA loan limits vary by county and number of units. For a 4-unit property in a high-cost area, the 2026 limit can exceed $1.8M. Check your specific county limits at HUD.gov.
FHA vs Conventional for House Hacking
If you have 5% or more to put down and a 700+ credit score, compare FHA to conventional financing. Conventional loans on 2-unit properties require 15% down (5% with some lenders for first-time buyers), but conventional PMI can be removed at 20% equity. FHA MIP stays for the life of the loan with less than 10% down, which can add $200-400/month to your payment on a $400K property. Run both scenarios in this calculator to see which saves more.
House Hacking vs Traditional Real Estate Investing
House hacking occupies a unique position between homeownership and traditional rental property investing. Understanding the differences helps you decide which strategy fits your current situation and long-term goals.
| Factor | House Hacking | Traditional Rental |
|---|---|---|
| Down Payment | 3.5% (FHA) | 20-25% |
| Interest Rate | Owner-occupied (lower) | Investment (0.5-0.75% higher) |
| Living Cost Reduction | 50-100% covered | Separate expense |
| Cash-on-Cash Return | Often 15-30%+ | 8-15% typical |
| Privacy | Shared property | Separate residence |
| Management | You are on-site | Can hire PM |
The major advantage of house hacking is leverage efficiency. With $15,000 down on a $425,000 duplex, you control a $425K asset, eliminate most of your housing cost, and start building equity immediately. A traditional rental investor needs $85K-$106K for the same property. House hacking compresses the timeline from saving for a down payment by years for most first-time investors.
Related Guides
Frequently Asked Questions
What is house hacking?
House hacking is a real estate strategy where you buy a multi-unit property (duplex, triplex, or fourplex), live in one unit, and rent out the others. Tenant rent offsets your mortgage payment, reducing or eliminating your housing cost. You can use owner-occupied FHA financing with as little as 3.5% down.
Can you use an FHA loan for a duplex or fourplex?
Yes. FHA loans allow financing for 1-4 unit properties as long as you occupy one unit as your primary residence. The minimum down payment is 3.5% with a 580+ credit score. For 3-4 unit properties, the property must pass a self-sufficiency test where 75% of total rent covers the full PITI payment.
How long do you have to live in a house hack?
FHA requires you to occupy the property as your primary residence for at least 12 months after closing. After one year, you can move out and keep the FHA loan. Many investors then buy another property and repeat the process to build a portfolio.
Does house hacking require PMI?
If you use an FHA loan with less than 10% down, mortgage insurance premium (MIP) is required for the life of the loan. The annual MIP rate is typically 0.85% of the loan balance. With 10% or more down, MIP drops off after 11 years. Conventional loans allow PMI removal at 20% equity.
How much of my mortgage will tenants cover?
Tenant coverage depends on the number of units, rent levels, and total carrying costs. In a duplex, one tenant typically covers 40-70% of your total PITI. In a triplex, two tenants may cover 70-100%. In a fourplex, three tenants often cover 100% or more, meaning you live for free or even earn income.
Is house hacking worth it in 2026?
House hacking remains one of the most capital-efficient ways to start investing in real estate. Even with higher interest rates, the strategy works because you are reducing or eliminating your personal housing cost while building equity. The key is finding properties where rent-to-price ratios are favorable. Use this calculator to model specific deals in your target market.