You have a bedroom nobody sleeps in and a mortgage that would be easier with a second contribution. The arithmetic looks obvious: rent it for a thousand dollars, keep a thousand dollars. It is not obvious, and the gap between the headline rent and what you actually keep is where most first-time hosts get their forecast wrong by a third or more.
The useful version of this question is a worksheet, not an opinion. Three things decide the answer: what the room can realistically be let for in your area, which costs the tax rules let you allocate against it, and how many days a year you rent it. That last number matters more than most people expect, because federal tax law changes the treatment entirely at fifteen days.
Before the numbers, one honest framing: a room only pays when it is occupied, and occupancy is never continuous. Hosts who want something that fills the empty weeks often run a second, smaller line alongside — I am Beezy, for instance, pays you for consulting content, which is income that does not depend on anyone moving in.
How much does renting out a room really leave you?
Start with a defensible rent, not a hopeful one. The Census Bureau's Quarterly Residential Vacancies and Homeownership release for the second quarter of 2026, published on 28 July 2026, puts the median asked rent for a vacant unit for rent at 1,531 dollars a month nationally. That is a whole unit, not a room, so it is a ceiling rather than a target — but it anchors the order of magnitude, and the same release reports a rental vacancy rate of 7.3 percent, rising to 8.0 percent inside central cities and 9.5 percent in the South, against 5.3 percent in the West. A high local vacancy rate is a warning that your room competes with empty apartments.
Set the rent against your actual market, not the national figure
The only public reference for rent by metropolitan area is the Fair Market Rent series published by the Department of Housing and Urban Development at huduser.gov. Portal estimates from listing sites are commercial products, not official data, and they should not be the number you build a budget on. Pull the FMR for your area, then discount for the fact that you are letting one room in a shared home rather than a self-contained unit.
The costs that come off before you count anything
Four categories move as soon as a second adult moves in: utilities, particularly electricity and water; consumables and cleaning; wear and turnover cost between occupants; and the vacancy weeks themselves. Electricity is the one people underestimate the most, and it is also the one with no national answer — the Energy Information Administration's Electric Power Monthly for May 2026 records a national residential average of 18.44 cents per kilowatt-hour, but the range runs from 12.35 cents in Idaho to 52.00 cents in Hawaii, with California at 33.25 and New York at 29.93. A second occupant costs four times as much to keep warm in Honolulu as in Boise, for exactly the same behaviour.
The worksheet, in the order to fill it in
| Line | How to fill it | Frequency |
|---|---|---|
| Room rent agreed | Your figure, benchmarked against HUD Fair Market Rent | Monthly |
| Expected occupancy | Months let out of twelve, honestly estimated | Annual |
| Added utilities | Compare twelve months of bills before and after | Monthly |
| Consumables and cleaning | Actual receipts, not an estimate | Monthly |
| Turnover cost | Repainting, repairs, listing time between occupants | Per turnover |
| Allocated share of housing costs | See the division rule below | Annual |
| Tax on the net | Depends on the schedule you land on | Annual |
The fifteen-day rule that decides the whole treatment
Federal tax law treats a dwelling you also live in differently from one you do not, and the switch points are precise. They come from IRS Topic no. 415, Renting residential and vacation property, last reviewed on 28 January 2026.
Fewer than fifteen days: nothing to report
The IRS states a special rule directly: if you use a dwelling unit as a residence and rent it for fewer than fifteen days, you do not report any of the rental income and you do not deduct any expenses as rental expenses. Fourteen nights of rental income in your own home is not reportable at all under that rule. For homeowners near a stadium, a festival or a convention centre, that is the entire strategy: a small number of high-rate nights, cleanly outside the reporting regime, rather than a year of modest ones inside it.
The residence test, and why it is a comparison
You are considered to use a dwelling unit as a residence if your personal use during the year exceeds the greater of fourteen days or ten percent of the total days you rent it to others at a fair rental price. Personal use has a defined meaning here: days used by you or anyone with an interest in the property, by a family member of either, by anyone under an agreement that lets you use another dwelling, or by anyone at less than a fair rental price. That last item catches a common arrangement — letting a relative stay at a discount converts those nights into personal use.
Dividing the expenses between the two uses
Where a unit serves both purposes, the IRS requires you to divide total expenses between rental use and personal use based on the number of days used for each. It also caps the result: rental expenses cannot exceed the gross rental income limitation, which is gross rental income less the rental portion of mortgage interest, real estate taxes, casualty losses and rental expenses such as agent fees and advertising. Excess amounts may be carried forward to the next year, subject to the same limitation again. Deductible categories named on the same page include mortgage interest, real estate taxes, casualty losses, maintenance, utilities, insurance and depreciation, reported on Schedule E of Form 1040.
Schedule E or Schedule C?
This is the fork that changes the tax bill most, and it turns on what you provide rather than on how much you charge.
Rent alone versus rent plus services
Straightforward room rental — a key, a lease, a bathroom — is reported as supplemental income on Schedule E. Once you provide substantial services of the kind a hotel provides, daily cleaning, meals, linen changes during the stay, concierge arrangements, the activity looks less like passive rental and more like a trade or business, and the reporting moves accordingly. IRS Publication 527, Residential Rental Property, is the reference that walks through the distinction, and it is the document to read before you decide.
Why the difference is expensive
Schedule C income from a trade or business is subject to self-employment tax. The IRS page on self-employment tax, reviewed on 27 June 2026, sets that rate at 15.3 percent — 12.4 percent for Social Security and 2.9 percent for Medicare — and requires Schedule SE once net earnings from self-employment reach 400 dollars. That is a substantial layer on top of income tax, and it is the reason the hotel-style extras you were planning to offer deserve a second look before you offer them.
The rental loss trap
If you rent to make a profit and do not use the unit as a residence, deductible expenses can exceed gross rental income — but the IRS notes that the resulting losses are generally limited by the at-risk rules and the passive activity loss rules, with Publication 925 as the reference. A paper loss on a spare room is rarely the tax shield people assume it is. Also relevant if your income is high: rental income may fall within the net investment income tax, covered by IRS Topic no. 559.
Filling the empty months with I am Beezy alongside a spare room
Every room rental has gaps. A tenant leaves in June, the next one arrives in September, and three months of the forecast quietly disappear. The mechanism on I am Beezy is deliberately plain: videos, articles and advertisements are put in front of you, and every one you look at credits an amount to the payment method you already use. The reference is 5 to 15 euros a day, which converts to roughly 5.80 to 17.30 dollars at the Federal Reserve's 31 July 2026 rate of 1.1519 dollars to the euro. Convert again at the current rate — the euro traded between 1.1376 and 1.1522 dollars across the last five sessions of that month.
What that covers in practice
It does not replace a tenant. What it does is take the sting out of a vacancy month, and it keeps running while you repaint, re-list and screen the next applicant — the exact period when a room-rental budget shows a zero.
Income that needs no lease
The second advantage is administrative. There is no agreement to draft, no deposit to hold, no notice period, and no one else in your kitchen. For homeowners who are still deciding whether they want a housemate at all, it is a way to test the budget assumption before testing the living arrangement.
The rules your city sets, not Washington
Federal tax law is only one layer. The rules that most often stop a room rental outright are local, and they vary between neighbouring towns.
Short-term rental ordinances are municipal
Rules on short-term letting — registration, night caps, whether the owner must be present, permitted zones — are set by each city. There is no national standard and no federal register of them. Before listing anywhere, search your municipality's own site for its short-term rental ordinance, and check whether your county adds a transient occupancy or tourist development tax collected separately from state sales tax.
Occupancy, insurance and the agreements you already signed
Three documents can override the whole plan: your local occupancy code, which may cap the number of unrelated adults in a dwelling; your homeowner insurance policy, which may not cover a paying occupant; and your homeowners association covenants or, if you rent, your own lease. Insurance is not federally regulated in the United States — each state licenses its insurers and approves their policies through its own insurance commissioner — so the only reliable answer comes from your carrier in writing.
Who sets what, at a glance
| Question | Set by | Where to check |
|---|---|---|
| Is the income reportable | Federal law | IRS Topic no. 415, Publication 527 |
| Which schedule and whether SE tax applies | Federal law | IRS Publication 527, Schedule SE instructions |
| State income tax on the net | Each state | State tax authority; some states levy none |
| Short-term rental permits and night caps | Each city | Municipal code |
| Occupancy limits | City or county | Local housing or building department |
| Whether your policy covers a lodger | Your insurer, licensed by the state | Your carrier, in writing |
Running the numbers before you list
Fill in the worksheet with your own figures, count the days you intend to rent, and check whether you fall under fifteen. Then decide deliberately whether to offer hotel-style services, knowing what that does to the tax treatment, and call your municipality and your insurer before you photograph the room. A spare bedroom can be a solid line in a household budget; it is simply a smaller line than the headline rent suggests, and it is empty part of the year. For those months, sign up free on I am Beezy: every piece of content you look at is credited, and the line keeps moving between tenants.
