Finance category
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House Hacking Calculator
House hacking is the fastest way for a first-time buyer to build real estate equity. This calculator models your net housing cost after tenant rent — often negative in duplexes through fourplexes at today's rents.
FHA allows 3.5%
Your monthly housing cost
$413
after tenant rent
Effective rent collected
$3,487
Tenant % of housing
89.42%
how much tenants cover
Annual savings vs $2,500 rent
$25,050
How the math works
House hacking means buying a multi-unit property, living in one unit, and renting the others. FHA and conventional low-down-payment loans apply because it's owner-occupied. Tenants effectively pay down your mortgage while you live nearly free.
Scale options: duplex → triplex → fourplex (max FHA owner-occupied). Rent-by-room on a single family house also works. After a year of owner occupancy, you can move out and keep the property as a pure rental, then repeat the process — the classic "BRRRR + house hack" ladder.
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This House Hacking Calculator is built to give a quick, browser-based estimate for house hacking. House hacking is the fastest way for a first-time buyer to build real estate equity. This calculator models your net housing cost after tenant rent — often negative in duplexes through fourplexes at today's rents. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the house hacking result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this house hacking estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter purchase price, down payment %, rate — FHA allows 3.5% down on owner-occupied properties up to 4 units.
- Enter full monthly PITIA (principal + interest + tax + insurance + HOA/association).
- Enter total units and units you'll rent out.
- Enter average rent per unit and vacancy assumption.
Frequently Asked Questions
Can I use FHA for a fourplex?
Yes — FHA allows 3.5% down on 1–4 unit owner-occupied properties with self-sufficiency ratios. VA allows 0% down. Conventional allows 5-15% down depending on units. All require you live in one unit for at least one year.
Can I count tenant rent toward qualifying?
Yes, on 2–4 unit properties. FHA and conventional allow 75% of market rent on vacant units and 75% of lease-documented rent on occupied units to count toward your debt-to-income ratio. This significantly expands buying power.
What about a rent-by-room single family?
Works too — same math, different structure. Single-family owner-occupied plus renting rooms has fewer regulatory hoops than multi-unit but typically fewer rooms to rent (1–3 vs 3 in a fourplex).
When can I move out?
FHA requires 12 months owner occupancy. After that, you can move out, refinance to non-owner-occupied (if needed), and keep the property as a rental. Repeat the process on a new property — rinse and repeat for portfolio building.
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