Overview

Adding a roommate or tenant changes your household finances — and often your tax filing. Whether you call someone a “roommate” or a “tenant” matters less to the IRS than the facts: are you receiving payment in exchange for the use of living space, and is there a profit motive or services provided? This guide explains how to treat rental income and expenses, how to allocate costs when only part of your home is rented, recordkeeping best practices, and common tax pitfalls to avoid.

(Author note: In my 15 years advising people who convert spare rooms into rental income, the most frequent issues are poor documentation and misunderstanding when rental activity should be treated as a business.)

When is money from a roommate taxable?

  • All rent and other tenant-paid benefits used to reduce your household expenses are generally taxable income and must be reported to the IRS. That includes cash, checks, and non-cash items such as a roommate paying all utilities or carrying property-related bills on your behalf (see IRS guidance on rental income and expenses).
  • A common exception: if you rent your home (or part of it) for fewer than 15 days in the year, that income is typically not reportable (IRS Publication 527). This exclusion rarely applies to year-round roommates.
  • Distinguish services: payments for lodging that include substantial services (regular cleaning, meals, concierge-type services) may be treated as business income and reported on Schedule C rather than Schedule E.

Sources: IRS Publication 527, “Residential Rental Property” and IRS topic pages on rental income (https://www.irs.gov/publications/p527).

How to report rental income (roommate vs. tenant)

  • Most residential landlords report rental income on Schedule E (Supplemental Income and Loss), attaching it to Form 1040. Income reported on Schedule E is generally not subject to self-employment tax unless you provide substantial services.
  • If your arrangement resembles a small business (you provide substantial services, operate like a hotel, or buy and sell short-term rentals frequently), report income on Schedule C and pay self-employment tax on net profit.
  • For help deciding between Schedule E and Schedule C, see our detailed guide: Schedule E vs Schedule C. (Internal link: Schedule E vs Schedule C for rental income).

What rental-related expenses can you deduct?

You can deduct ordinary, necessary expenses for the rental portion of your property. When only part of your home is rented, you must reasonably allocate expenses between personal and rental use.

Common deductible expenses (allocated to rental portion):

  • Mortgage interest (the portion allocable to the rented space)
  • Property taxes (pro-rated)
  • Utilities and insurance (shared or allocated)
  • Repairs and maintenance specifically for the rented area
  • Depreciation on the portion of the home used for rental
  • Advertising and professional fees (e.g., property manager, tax preparation related to rental)

Example allocation: if your roommate uses one bedroom in a five-room house (20% by room count) or occupies 30% of total square footage, you can use a consistent method (square footage is preferred) to allocate expenses. For depreciation, you must allocate the portion of the home’s basis attributable to building (not land) to the rental percentage and depreciate that amount over 27.5 years for residential rental property.

Depreciation can materially reduce taxable rental income, but it also sets up depreciation recapture when you sell the property (taxed at ordinary income rates up to a limit). For depreciation rules and correcting depreciation errors, see our internal resources: Depreciation and amending returns.

Simple example (numbers)

Tom rents a room for $1,200/month ($14,400/year). His home-related annual expenses (mortgage interest + property tax + utilities + repairs) total $24,000. The rented space is 30% of the home’s square footage.

  • Rental income: $14,400
  • Allocable expenses (30% of $24,000): $7,200
  • Depreciation (assume building basis allocable to rental = $60,000; annual depreciation = $60,000 / 27.5 ≈ $2,182)
  • Net rental income before other adjustments = $14,400 – $7,200 – $2,182 ≈ $5,018

Tom reports the $5,018 on Schedule E (or Schedule C if services were substantial). Keep all supporting paperwork in case of audit.

Recordkeeping: what to keep and why

Good records are the single best defense in an audit. Maintain:

  • A written lease or rental agreement showing rent amount, start date, and terms
  • Copies of canceled checks, bank deposits, or screenshots of electronic payments
  • Receipts and invoices for repairs, maintenance, utilities, and improvements
  • A consistent method and worksheet showing how you allocated expenses (square footage floorplan or bedroom count)
  • Photos or time-stamped records for capital improvements

See our internal guide on recordkeeping for small-scale rentals for practical templates and sample logs: Recordkeeping Best Practices for Small-Scale Rental Income.

Common mistakes and audit triggers

  • Treating roommate rent as a nontaxable gift or household contribution. The IRS treats amounts paid for the right to occupy space as rental income.
  • Using inconsistent allocation methods or changing allocation mid-year without documentation.
  • Failing to report noncash payments (e.g., roommate pays utilities or does paid renovations).
  • Claiming personal expenses as rental deductions (e.g., improperly deducting the homeowner’s personal mortgage principal or personal living expenses).

If the IRS questions missing rental income, you may receive a CP2000 notice or other correspondence. When that happens, respond with clear records of payments and allocations. See our guide on responding to rental income notices for step-by-step tips.

How adding a roommate or tenant affects other tax and financial considerations

  • Tax credits and benefits: higher reported income could reduce eligibility for income-based tax credits, premium tax credits for health insurance (ACA), or income-based student aid. Consider the wider financial impact of reporting rental income.
  • Capital gains exemption on sale of a primary residence: renting part of your home may require allocating gain when you sell and could reduce the portion eligible for exclusion under Section 121. Depreciation taken while renting cannot be excluded and is subject to recapture.
  • Insurance and liability: landlord use can change insurance needs. A renter’s claim could implicate your homeowner policy; consider landlord or umbrella coverage.
  • Local rules and taxes: short-term rentals often face local registration, occupancy taxes, and zoning rules. Confirm local requirements before listing (city or county regulations vary widely).

When to treat the arrangement as a business (Schedule C)

If you provide substantial services to the occupant (regular cleaning, meals, concierge services) or operate like a hotel/B&B, the IRS may view your activity as a business. Business rental activity can be subject to self-employment tax and different deductibility rules. For examples and decision factors, review our Schedule E vs Schedule C article linked earlier.

Practical tips and strategies

  • Put it in writing: use a simple lease even for a roommate. Clear terms reduce disputes and provide documentation.
  • Use a dedicated account or clear bank records for rent payments to show income flow.
  • Decide upfront how you’ll allocate shared bills and document the method (percent of rooms or square footage).
  • Track capital improvements separately from repairs—only repairs are deductible in the year incurred; improvements are capitalized and depreciated.
  • Consider consulting a CPA before taking on long-term tenants or converting multiple rooms; small decisions can change tax classification and long-term capital gains consequences.

When to consult a pro

Complex situations—co-owners renting out part of a property, converting space into a separate rental unit, renting multiple properties, or handling depreciation recapture after a sale—usually require CPA or tax attorney guidance. Tax consequences can vary by state; state tax rules may treat rental income differently.

Helpful IRS and consumer resources

Closing note and disclaimer

This article explains general federal tax principles related to renting part of your home and is current as of 2025. It is educational and does not substitute for personalized tax advice. For questions specific to your situation — especially those involving state taxes, insurance, or potential business classification — consult a licensed CPA or tax professional.

Internal resources referenced:

Professional disclaimer: This content is educational and not individualized tax advice. Consult a qualified tax professional to apply these concepts to your facts and local law.