Direct answer: Rent from a room in the home you live in is generally rental income. IRS Publication 527 says to divide shared expenses, such as mortgage interest, property tax, and heat for the whole house, between the rented part and your personal part using a reasonable method, most commonly square footage or number of rooms, and to deduct the rental part on Schedule E (Form 1040). To sketch the split with your own numbers, use the tax deduction estimator.
Please have a CPA or enrolled agent review your situation. This page explains general federal concepts. It does not calculate your deduction or account for state taxes, passive-loss limits, below-market rentals, short-term use, separate dwelling units, or your complete tax picture.
Begin with the basic rule
Rent you receive is generally rental income. The IRS says expenses connected with producing that income may be deductible, subject to limits and allocation rules. A normal room rental is commonly reported on Schedule E, but the facts can change the treatment.
If you rent part of the home you live in, divide appropriate expenses between rental and personal use as though they related to two parts of the property.
Choose a reasonable allocation method
IRS Publication 527 says a reasonable method may be used to divide a whole-home expense. It identifies square footage and number of rooms as two common methods. For some costs, another method such as the number of people using a utility may be reasonable.
Illustration only: a 180-square-foot rented bedroom in a 1,800-square-foot home is 10 percent of the home by square footage. That does not automatically mean every expense is 10 percent deductible. Direct, shared, capital, and personal expenses can receive different treatment.
If you want to run those numbers with your own rent and costs, use the tax deduction estimator. It is a browser-only sketch, not a return.
Sort costs before deducting them
| Type | General idea | Examples |
|---|---|---|
| Direct rental cost | May be entirely allocable to the rental activity | Advertising the room, screening fees, liability coverage for the rental, or painting only the rented room |
| Whole-home cost | Divide using a reasonable method | Mortgage interest, property tax, insurance, utilities, or exterior maintenance |
| Personal cost | Not a rental expense | Work that benefits only the homeowner's private area |
| Improvement or asset | May need capitalization and depreciation | A renovation, major system replacement, or furniture used in the rental |
Mortgage principal is not a rental expense. Only the interest portion may be relevant, and only after the proper allocation. The treatment of repairs and improvements is different: a repair generally keeps property in ordinary operating condition, while an improvement may add value, prolong useful life, or adapt the property to a new use and may need to be recovered over time.
Depreciation needs careful handling
Residential rental real estate is generally depreciated over 27.5 years under the rules described in Publication 527. Land is not depreciable.
When property held for personal use is converted to rental use, the depreciation basis is generally the lower of the property's adjusted basis or fair market value on the conversion date. For a room rental, the rental portion must then be determined using an appropriate allocation method.
Furniture, appliances, and improvements may have different recovery periods or other available treatment. Do not assume that a cost is immediately deductible simply because it benefits only the rented room.
Why skipping depreciation can matter later
IRS Publication 523 explains that gain equal to depreciation allowed or allowable for rental use after May 6, 1997 generally cannot be excluded under the home-sale exclusion. In plain language, depreciation can affect the tax result when you sell even if you did not claim every deduction you were entitled to claim.
The sale rules also distinguish rental space within the home's living area from a separate business or rental portion outside it. Detached units, converted garages, and accessory dwellings can require different calculations. Get advice before a sale rather than trying to reconstruct years of records afterward.
A cautious example
Assume a homeowner receives $900 per month for a bedroom and uses a documented 10 percent square-foot allocation for appropriate whole-home expenses. The owner might report $10,800 of annual rental income, then evaluate direct rental costs, the allocable share of eligible whole-home expenses, and allowable depreciation.
This example intentionally stops before producing a taxable-income figure. The result depends on basis, fair market value at conversion, land value, placed-in-service date, expense limits, repairs versus improvements, personal use, passive-activity rules, and the homeowner's complete facts.
Keep records from the first day
- The signed room rental agreement and a log of rent received
- Your written allocation method, measurements, and supporting notes
- The purchase closing statement and records of major improvements
- Evidence supporting fair market value when the rental use begins, if needed
- Mortgage interest, property tax, insurance, and utility statements
- Receipts labeled as direct rental, shared, personal, repair, or improvement
- The depreciation schedule carried forward from year to year
Questions to take to a tax professional
- What is the correct depreciation basis and placed-in-service date?
- Which allocation method best fits this home and these expenses?
- How should shared areas be treated?
- Which costs are repairs, improvements, furniture, or supplies?
- Do personal-use or passive-activity limits apply?
- How could the rental affect a future home sale or state return?
Common questions about room rental taxes
How is renting out a room in my primary residence taxed?
In general, the rent is rental income. IRS Publication 527 says that when you rent part of your property, you divide certain expenses between the rental part and the personal part as though they were two separate pieces of property. Costs that belong only to the rented room, such as painting it or liability insurance for renting it, are rental expenses in full. The personal part of expenses like mortgage interest and real estate taxes generally stays deductible only if you itemize on Schedule A.
Do I report rent if I rent the room for less than 15 days a year?
Publication 527 has a special rule: if you use a dwelling unit as a home and rent it less than 15 days during the year, its primary function is not considered rental, it should not be reported on Schedule E, and you are not required to report the rental income and expenses. A roommate who stays a month or more is past that limit. Ask a tax professional how the rule applies to your home.
Is a roommate’s security deposit taxable income?
Not when you receive it, if you plan to return it at the end of the stay, according to Publication 527. If you keep part or all of it because the renter did not meet the terms, include the amount you keep in income for that year. A deposit that will be used as the final month’s rent is advance rent and is income when you receive it.
Can I deduct part of my utilities when I rent a room?
Publication 527 treats utilities like heat for the whole house as expenses to divide between rental and personal use with a reasonable method. Its own example: a 180-square-foot rented room in an 1,800-square-foot house is 10 percent, so 10 percent of a shared heating bill is a rental expense. It also says splitting some costs, such as water, by the number of people using them may be reasonable.
Primary IRS sources
Market context
Research local rent estimates
Whole-property and unit estimates can provide market context. They are not a precise spare-room valuation, so compare them with actual room listings.
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RoomRental.com does not provide tax, legal, accounting, appraisal, or financial advice. IRS publications change. Confirm the current rules and your own facts before filing.
Try a rough allocation illustration
Use square footage or room count to see an educational estimate of rental versus personal expenses. It is not a filing number.
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