House Hack Calculator

Background.

House Hack Calculator supports a concrete decision: use it to estimate the owner's housing cost after rent from other units offsets mortgage, escrow and operating costs. The result needs one precise interpretation: a house hack is an owner-occupied property where tenant rent reduces, but does not legally net against, the owner's separate obligations. The selected relationship is “net owner housing cost = max(mortgage and escrow + operating costs − rent from other units, 0).”

The editable entries are monthly mortgage and escrow, monthly utilities, maintenance and reserves, monthly rent from other units or rooms. Use values from the document or measurement that governs this house hack question; the defaults are only the worked fixture below. Vacancy, repairs, tax on rent, reserves and owner-occupancy loan rules must be budgeted outside the simple monthly offset. The house hack calculation does not infer that fact from the other entries.

Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment documents the convention or governing rule used here. The house hack output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is house hack calculator?

House Hack is the relationship behind this decision: a house hack is an owner-occupied property where tenant rent reduces, but does not legally net against, the owner's separate obligations. On this page it means net owner housing cost = max(mortgage and escrow + operating costs − rent from other units, 0). Vacancy, repairs, tax on rent, reserves and owner-occupancy loan rules must be budgeted outside the simple monthly offset; that is the line between the reported quantity and a broader real estate analysis.

How to use this calculator.

1. 01Confirm that “net owner housing cost = max(mortgage and escrow + operating costs − rent from other units, 0)” matches the house hack convention you need.
2. 02Replace the fixture values for monthly mortgage and escrow, monthly utilities, maintenance and reserves, monthly rent from other units or rooms with dated values from the governing record.
3. 03Keep all currencies, measurement units and time periods on the same basis before calculating.
4. 04Read net monthly owner housing cost together with this boundary: Vacancy, repairs, tax on rent, reserves and owner-occupancy loan rules must be budgeted outside the simple monthly offset.

The formula.

The calculation uses net owner housing cost = max(mortgage and escrow + operating costs − rent from other units, 0). In this house hack model, the entered terms are monthly mortgage and escrow, monthly utilities, maintenance and reserves, monthly rent from other units or rooms. A house hack is an owner-occupied property where tenant rent reduces, but does not legally net against, the owner's separate obligations, which is why the relationship is presented under this name rather than as a universal alternative. Vacancy, repairs, tax on rent, reserves and owner-occupancy loan rules must be budgeted outside the simple monthly offset. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Fannie Mae Selling Guide B3-3.1-08, Rental Income; documented gross and net rental-income treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
2. [2]Freddie Mac, Modeling Multifamily Potential Rental Income; current rent roll, concessions and vacancy treatment. Retrieved 2026-08-07. access: open unless marked otherwise.
3. [3]U.S. Internal Revenue Service. Publication 527, Residential Rental Property. Retrieved 2026-08-07. independence: primary; access: open.