What Are the Tax Implications of Renting Out a Room in Your Home?
Renting a spare bedroom feels casual compared to owning a rental property outright, but the tax code doesn’t fully agree — the income is still income.
The short answer
Rent collected for a room within a primary residence is generally reportable income, and a portion of the home’s expenses — things like mortgage interest, property tax, utilities, insurance, and repairs — can typically be deducted against that income based on how much of the home and how much of the time is devoted to the rental. The key difference from renting out an entire separate unit is that only a share of the home’s costs applies, not the whole thing, since part of the home remains personal-use space.
Why allocation is the central concept
Because the owner still lives in the home, expenses have to be split between personal use and rental use rather than treated as fully one or the other. That allocation is usually based on either the square footage devoted to the rented space relative to the whole home, or on the amount of time the space was actually rented out during the year, or sometimes a combination of both when a room is shared or used seasonally.
A simple illustration
Imagine a home where one bedroom, representing a modest share of the home’s total square footage, is rented out for part of the year. A reasonable approach allocates that same share of whole-home costs — a portion of mortgage interest, property tax, utilities, and insurance — to the rental, while the rest of those costs stay tied to personal use and follow the usual rules for a primary residence instead.
What generally counts as reportable income
- Rent payments received. The core taxable income, regardless of whether it’s collected monthly or for a shorter stay.
- Payments for services bundled in. If cleaning, meals, or utilities are included in the rent and billed as one price, that full amount is generally still income.
- A security deposit, usually not. A deposit held as a refundable liability is treated differently, the same way it is for a full rental property, and generally isn’t income unless it’s kept.
Expenses that can typically be allocated
Beyond the direct costs of the rented space itself — things bought specifically for that room, for instance — a share of whole-home costs like mortgage interest, property tax, homeowners insurance, utilities, and general repairs can usually be allocated to the rental portion using the same square-footage or time-based method. Costs benefiting only the personal-use part of the home generally aren’t allocated to the rental side at all.
How this differs from renting an entire unit
Renting an entire separate unit — a whole house, a detached apartment, a fully separate space — generally allows the full expenses tied to that unit to be treated as rental expenses, since there’s no personal-use overlap to divide. Renting a single room within a home someone still lives in is a mixed-use situation, which is why the allocation step exists in the first place and doesn’t apply the same way to a wholly separate rental property.
What to weigh
Renting out a room turns part of a primary residence into a small-scale income-producing asset, with its own reporting obligations and its own allocation math, even though it can feel more like a casual arrangement than formal landlording. Because the specific allocation method, recordkeeping requirements, and applicable rules depend on individual circumstances and can change, this is a case where understanding the general split between personal and rental use matters more than assuming it works like either a full rental or no rental at all.