House Hacking Calculator
House hacking means buying a 2-4 unit building, living in one unit, and renting the others to offset your mortgage — and NYC’s outer boroughs (the Bronx, Queens, Brooklyn, Staten Island) have some of the country’s largest supply of legal 2-4 family houses to do it with. This calculator shows your real net monthly housing cost after rental income, and the cash you’d need at closing — using the same mansion tax, mortgage recording tax, and title insurance math as NestApple’s other NYC closing cost calculators.
What Is House Hacking?
House hacking is buying a small multi-family property, living in one unit, and using rent from the other units to cover most or all of your mortgage. Lenders treat it as an owner-occupied purchase — not an investment property — which unlocks lower down payments and better rates than a pure rental purchase, as long as you actually live in one unit as your primary residence.
Results
Enter a purchase price below to see your numbers.
Common Questions
Conventional and FHA owner-occupied financing generally covers 2-4 unit properties — you live in one unit and rent the rest. Five or more units is treated as commercial financing with different qualification rules, so most NYC house hackers target 2-4 family houses in the Bronx, Queens, Brooklyn, or Staten Island.
Often yes, partially. Many lenders will count a portion of the projected or existing rental income from the other units toward your qualifying income, which is part of why house hacking can unlock a bigger purchase than your salary alone would support — confirm the exact treatment with your specific lender, since policies vary.
Units don’t stay rented 100% of the time — tenants move out, units sit empty between leases, and rent occasionally goes unpaid. A vacancy allowance (5% is a common conservative default) reduces gross rent to a more realistic effective figure, so your net cost estimate doesn’t assume a perfect year.
Owner-occupied loan programs require you to move in within a set window (typically 60 days) and use the property as your primary residence, usually for at least one year, before you can move out and keep the original owner-occupied loan terms. Confirm the exact occupancy requirement with your lender before counting on it.
A 2-4 unit house is real property, just like a condo — so it’s subject to the same mortgage recording tax, title insurance, and mansion tax rules as any other NYC real property purchase, unlike a co-op purchase, which is exempt from all three.
It doesn’t model landlord tax deductions (depreciation, mortgage interest allocated to the rental units), appreciation, or what happens after you eventually move out and rent all the units — those depend on your personal tax situation and are worth a conversation with your accountant.
