Renting out part of your home changes your tax situation and your legal exposure, even if you only rent one room

When you rent out a bedroom, basement, or accessory dwelling unit on your property, you move from being a homeowner to being a landlord — at least in the eyes of the tax authority and the courts. The income you receive becomes taxable, you can deduct certain expenses against it, and you become liable if a tenant is injured on your property. The financial picture depends partly on how much you rent out, how much you charge, and what state and city you live in. This guide explains what actually changes in your finances and your legal standing.

Key Takeaways

  • Rental income from a room or unit in your home must be reported to the IRS, even if you receive it in cash or through an informal agreement.
  • You can deduct a portion of your mortgage interest, property tax, utilities, repairs, and insurance based on the percentage of your home that is rented.
  • Depreciation deductions reduce your taxable income now but create a tax bill when you sell the home, because the IRS recaptures that depreciation at a higher rate.
  • A tenant injured in a rented room or unit can sue you personally unless you have landlord liability insurance, which homeowners policies typically exclude.
  • Some cities require a license or permit to rent out part of your home, and some limit how many people can live in a rental unit or how many units you can rent.

How rental income gets taxed

Any money you receive for renting out part of your home is taxable income and must be reported on your federal tax return. This includes rent paid in cash, through Venmo, or under a handshake agreement. The IRS does not require a formal lease or a certain payment method — if you received money in exchange for letting someone live there, it counts as rental income.

You report this income on Schedule E (Supplemental Income and Loss), which is part of your Form 1040. The amount you owe in federal income tax depends on your total income and tax bracket, but you will owe something unless your deductions exceed your rental income. State and local income tax rules vary: some states tax rental income at the same rate as wages, some have lower rates for certain types of rental income, and a few states do not tax income at all. Check your state's department of revenue website to learn the rules where you live.

If you rent out the space for only part of the year — say, a room in a vacation home that you rent out in summer — you report only the income from those months. The same rule applies if you rent to a tenant for six months and then the space sits empty.

What expenses you can deduct

The key financial advantage of renting out part of your home is that you can deduct expenses, which reduces your taxable rental income. You can only deduct the portion of each expense that relates to the rented space. If you rent out one bedroom in a four-bedroom house, you can deduct roughly one-quarter of certain costs.

Expenses you can deduct include mortgage interest (not principal), property tax, homeowners insurance, utilities, repairs and maintenance, cleaning supplies, and advertising if you advertise for tenants. You can also deduct a portion of larger expenses like a new roof or HVAC system, though these are depreciated over many years rather than deducted all at once. You cannot deduct the cost of improvements that add value to the home — like a kitchen remodel — unless that improvement is specific to the rental space.

Keep receipts and records for everything you deduct. The IRS can ask you to prove these expenses if you are audited, and if you cannot, you lose the deduction and may owe penalties. A simple spreadsheet or folder with photos and receipts is enough; you do not need accounting software, though it can help if you rent out multiple units.

Depreciation: the tax trap when you sell

Depreciation is a deduction that lets you write off a portion of your home's value each year, as if the building were wearing out. For a rental room or unit, you can depreciate the structure (not the land) over 27.5 years. If your home is worth $300,000 and the structure is worth $250,000, and you rent out one-quarter of it, you can depreciate roughly $22,750 per year.

This deduction reduces your taxable income now, which saves you money on taxes while you are renting out the space. But when you sell the home, the IRS recaptures all the depreciation you claimed and taxes it at 25 percent, regardless of your ordinary tax bracket. This means depreciation deductions are not truly "free" — they are a deferral that comes due when you sell.

Example: You rent out one room for five years and claim $5,000 in depreciation deductions each year, saving you $1,500 per year in taxes (at a 30 percent rate). When you sell, the IRS recaptures $25,000 in depreciation and taxes it at 25 percent, costing you $6,250. You came out ahead by $1,250 overall, but you owe a lump sum at sale. If you live in the home for two of those five years and claim the primary residence exemption when you sell, you may be able to exclude some of the gain — but depreciation taken after May 6, 1997 is not may be able to access for that exemption, so the recapture tax still applies.

Liability and insurance

When someone rents a room or unit in your home, they become a tenant, and you become responsible for maintaining the space safely. If a tenant is injured because of a hazard you knew about or should have known about — a broken stair, faulty wiring, a leaking roof — they can sue you for medical bills, lost wages, and pain and suffering. Your homeowners insurance typically does not cover this liability, because homeowners policies exclude rental activities.

You need a separate landlord liability policy, sometimes called a rental dwelling policy or landlord insurance. This covers injuries to tenants and guests, damage to the rental space, and loss of rent if the space becomes uninhabitable. The cost varies by location, the value of the home, and the number of units you rent, but typically ranges from a few hundred to over a thousand dollars per year. Some insurers will add a rider to your homeowners policy for a smaller fee if you rent out only one room, but you should ask your agent directly rather than assume.

If you do not have liability insurance and a tenant sues, they can go after your personal assets — your savings, your car, your equity in the home. A judgment against you can follow you for years and affect your ability to borrow money or refinance your mortgage.

Local rules: licenses, occupancy limits, and zoning

Many cities and counties require you to obtain a license or permit before you rent out part of your home. Some require an annual license renewal; others require a one-time permit. The rules vary widely by location. San Francisco, for example, requires a short-term rental license if you rent out a room for less than 30 days at a time, but not if you rent it long-term. New York City has strict limits on short-term rentals and requires a license that is difficult to obtain. Other cities have no formal licensing requirement but do have zoning rules that limit rental activity.

Many jurisdictions also have occupancy limits — rules about how many people can live in a rental unit based on its size. A common standard is one person per 150 square feet of living space, plus one additional person. If you rent out a 300-square-foot basement apartment, you might be limited to three occupants. Violating occupancy limits can result in fines and, in some cases, an order to stop renting.

Before you rent out part of your home, contact your city or county zoning office or planning department and ask whether you need a license, what occupancy limits apply, and whether there are any restrictions on rental activity in your neighborhood. This step takes an hour and can save you thousands in fines or legal costs later.

Self-employment tax and quarterly payments

Rental income from a room or unit in your home is not subject to self-employment tax (Social Security and Medicare tax), unlike income from a business or freelance work. This is one advantage of being a landlord rather than self-employed. You report the income on Schedule E and pay ordinary income tax on it.

However, if your rental income is substantial and you do not have enough tax withheld from other income, you may owe estimated quarterly tax payments to the IRS. These are due on April 15, June 15, September 15, and January 15. If you owe more than $1,000 in tax for the year and do not pay it through withholding or quarterly payments, you can face penalties. A tax professional can help you calculate whether you need to make quarterly payments based on your specific situation.

Frequently Asked Questions

Do I have to report rental income if I only rent out a room for a few months?

Yes. Any rental income, regardless of duration or amount, must be reported to the IRS. Even if you rent a room for one month, that income is taxable. The only exception is if you rent the room to a family member or friend at below fair market value and do not intend to make a profit — but this is a narrow exception and the IRS scrutinizes it closely.

Can I deduct my entire mortgage payment as a rental expense?

No. You can deduct only the interest portion of your mortgage payment, and only the share that corresponds to the rented space. If you rent out one-quarter of your home and your monthly mortgage payment is $2,000, you can deduct roughly one-quarter of the interest portion — typically $300 to $400 per month, depending on your loan balance. The principal portion of your payment is not deductible.

What if I rent out a room but still live in the home?

You can still claim depreciation and deduct expenses for the rented portion. However, when you sell, you will owe recapture tax on the depreciation you claimed for the rental space, even though you lived in the home. The primary residence exemption (which lets you exclude up to $250,000 or $500,000 in gains if you are single or married) does not apply to the portion of the home you rented out.

What happens if I do not report rental income?

The IRS can assess back taxes, interest, and penalties if you are audited and rental income is discovered. Penalties for underreporting income can be 20 percent or more of the unpaid tax. If the IRS believes you deliberately hid income, criminal charges are possible, though rare for small amounts. It is far simpler and cheaper to report the income and take the deductions you are may have access to to.

Do I need a formal lease to rent out a room?

A lease is not required by the IRS to report rental income, but it is strongly recommended for your protection. A written lease clarifies the rent amount, the lease term, house rules, and what happens if the tenant stops paying or damages the space. Without a lease, you have fewer legal protections if a dispute arises, and eviction can be more complicated. Your state's landlord-tenant law may require certain disclosures or terms in any lease, so check your state's attorney general website for a template.