A house hacking calculator shows how much renting out rooms or units reduces your monthly housing costs — sometimes to zero. Enter your property details to see your effective payment and cash flow potential.
House Hacking Inputs
How to Use the House Hacking Calculator
This house hacking calculator shows your true effective housing cost after rental income. Many house hackers reduce their mortgage payment by 50-100%, and some generate positive cash flow.
Step 1: Enter Your Mortgage Payment
Include principal, interest, taxes, and insurance (PITI) — your full monthly payment to the lender plus escrow. Typical PITI is $1,500-$3,000 for homes priced at $250,000-$500,000 at current rates.
Step 2: Choose Your Strategy
Renting rooms is the easiest entry point — $500-$900/room in most markets. A duplex with a separate unit generates $900-$1,500/month from the other unit. A basement apartment often rents for $700-$1,200 and is common in older homes with walk-out basements.
Step 3: Understand the Results
Your effective payment is what you actually pay after rental income. If this is less than what you would pay in rent for equivalent private space, house hacking is a financial win even before considering equity building and appreciation.
The Power of 5 Years
Saving $1,000/month through house hacking for 5 years equals $60,000 in savings — enough for another down payment. Many investors use house hacking to acquire their first property at low FHA rates, then repeat with the savings for a second property.
FAQ
What is house hacking?
House hacking means buying a property and renting out part of it to reduce or eliminate your housing costs. Common strategies include renting rooms in a single-family home, buying a duplex/triplex and living in one unit, or renting an ADU (accessory dwelling unit) on your property. It is one of the most effective wealth-building strategies for first-time buyers.
Is house hacking legal?
Yes, in most jurisdictions. However, check your local zoning laws, HOA rules, and lease agreements. Short-term rentals (Airbnb) have additional regulations in many cities. Long-term room rentals in owner-occupied properties are generally straightforward with proper rental agreements.
What is a good effective mortgage payment for house hacking?
The goal is to get your effective monthly housing cost below what you would pay in rent for equivalent space. Many successful house hackers get this to $0 (living for free) or even generate cash flow. Even reducing a $2,500 mortgage to $1,000 after rental income saves $18,000 per year compared to renting.
Do I pay taxes on rental income from roommates?
Yes, rental income is taxable. However, you can deduct expenses proportional to the rented portion — a share of mortgage interest, property taxes, insurance, utilities, and maintenance. Consult a tax professional about your specific situation, especially if you are house hacking with an FHA loan.
Can I use an FHA loan for house hacking?
Yes, FHA loans allow owner-occupied multi-unit properties (up to 4 units). You must live in one unit as your primary residence. The rental income from other units can often be counted toward loan qualification, making it easier to buy. Down payment is 3.5% with FHA versus 20-25% for investment property loans.
Is this tool free?
Yes, completely free with no signup required. All calculations run locally in your browser.