2-to-4 Family House Hack Calculator
2-to-4 Family House Hack Calculator
See how rental income from extra units can slash your housing cost — or even put money in your pocket every month
Total purchase price of the property
FHA allows 3.5% on 2-4 family
Current 30-year fixed rate
Annual real estate taxes
Homeowner’s insurance premium
Combined rent from all rental units
Average monthly upkeep budget
What Is House Hacking?
House hacking is the strategy of buying a 2-to-4 family property, living in one unit, and renting out the others. The rental income offsets your mortgage payment — sometimes covering it entirely. In Staten Island and Brooklyn, where multi-family properties are common, this is one of the most powerful wealth-building strategies available to first-time and move-up buyers alike.
With FHA financing, you can purchase a 2-4 family home with as little as 3.5% down, as long as you occupy one unit as your primary residence. That means you could control an $800,000 property with under $30,000 down — and have your tenants help pay the mortgage.
How to Use This Calculator
Enter your purchase price, down payment, and loan details to see your full monthly carrying cost. Then add the rental income you expect from the other units. The calculator subtracts a vacancy allowance (because units aren’t always rented) and your maintenance budget, then shows you the net — your effective monthly housing cost. If that number is negative, congratulations: you’re living for free and making money.
The calculator also shows your cash-on-cash return — the annual cash flow divided by your total cash invested (down payment plus closing costs). This is the metric real estate investors use to compare deals.
Example 1: 2-Family Semi-Attached in Dongan Hills, Staten Island
A couple buys a 2-family semi-attached home in Dongan Hills for $750,000 with 20% down ($150,000). At a 6.75% rate on a 30-year term, property taxes of $7,200/year and insurance of $2,400/year, their total monthly carrying cost is $5,695. They rent the second unit for $2,200/month. After a 5% vacancy allowance ($110) and $250/month maintenance, their effective monthly housing cost is $3,355 — saving $2,340/month compared to carrying the home alone.
Example 2: 3-Family Detached in Tompkinsville, Staten Island
A first-time investor buys a 3-family detached in Tompkinsville for $875,000 with an FHA loan at 3.5% down ($30,625). Rate 6.75%, 30-year term, taxes $9,600/year, insurance $3,200/year. Total carrying cost: $6,641. They rent units 2 and 3 for $1,800 and $1,600 ($3,400 total). After 5% vacancy ($170) and $350/month maintenance, effective cost is $3,461. The rental income covers nearly half the total costs.
Example 3: 4-Family Brick in Bay Ridge, Brooklyn
An experienced buyer purchases a 4-family brick building in Bay Ridge for $1,400,000 with 25% down ($350,000). Rate 6.75%, 30-year term, taxes $14,400/year, insurance $4,800/year. Total carrying cost: $8,413. They rent three units at $2,200, $2,000, and $1,900 ($6,100 total). After 5% vacancy ($305) and $500/month maintenance, effective cost is $3,118 — the buyer lives in a prime Brooklyn location for a fraction of what a single-family owner would pay. Their cash-on-cash return exceeds 9%.
Frequently Asked Questions
Can I use an FHA loan to buy a 2-4 family home?
Yes. FHA allows financing on 2-, 3-, and 4-family properties with as little as 3.5% down, provided you occupy one unit as your primary residence for at least 12 months. FHA loan limits in NYC are higher for multi-family properties — up to $1,394,775 for a 4-family in 2025.
Does rental income count toward qualifying for the mortgage?
Most lenders allow 75% of projected rental income (from an appraisal or lease agreements) to be counted as qualifying income when applying for a loan on a 2-4 family property. This can significantly increase your purchasing power.
What is a good cash-on-cash return for a house hack?
Anything above 0% is a win when house hacking, because you’re already saving on your own housing costs. Many investors target 5-10% cash-on-cash return. In Staten Island and Brooklyn, strong house hacks can generate 8-15% cash-on-cash depending on the purchase price, rents, and down payment.
How much should I budget for vacancy and repairs?
A 5% vacancy rate is standard for well-located NYC multi-family properties. For maintenance and repairs, a common rule of thumb is 1% of the property value per year, divided by 12 for a monthly budget. Newer or recently renovated properties may need less; older buildings may need more.
Do I have to report rental income on my taxes?
Yes, rental income is taxable. However, you can deduct mortgage interest, property taxes, insurance, depreciation, repairs, and other expenses against that income. Many house hackers show a paper loss on their rental units while still collecting positive cash flow. Consult a CPA familiar with real estate for your specific situation.
Seller Net Proceeds •
NYC Mansion Tax •
Tax Grievance Savings •
Co-op Affordability •
Capital Gains Tax •
STAR & Exemptions •
Closing Costs
Ready to House Hack in Staten Island or Brooklyn?
Joseph Ranola and the Bridge & Boro Team specialize in multi-family properties across Staten Island and Brooklyn. Let’s find your next investment.
Disclaimer: This calculator provides estimates for educational purposes only. Actual costs vary based on loan program, lender requirements, tax assessments, insurance quotes, and rental market conditions. Consult a mortgage professional and real estate advisor before making purchasing decisions. Joseph Ranola | Bridge & Boro Real Estate Team | Exp Realty | (917) 905-2541