Short answer

A short-term rental is not automatically residential rental property. The Code's definition turns on dwelling units, and a dwelling unit does not include a unit in an establishment where more than half the units are used on a transient basis. A property rented for short stays may therefore be nonresidential real property with a 39-year recovery period for the building rather than 27.5 years. That makes the personal property and land improvements a study identifies proportionally more important, because the building itself depreciates more slowly. A second set of rules decides whether you can use the resulting deductions: if the average customer stay is seven days or less, the activity is not a rental activity for passive activity purposes, and losses are nonpassive only if you materially participate. This article explains both sets of rules and what a study changes for a short-term rental. It is general education, not tax advice; the facts that decide these questions are specific to each owner.

Two questions, two sets of rules

QuestionRuleWhat it decides
Is the building residential rental property?The 80 percent dwelling-unit test; units used on a transient basis in an establishment where more than half the units are transient are not dwelling units27.5-year or 39-year recovery period for the building
Can the owner use losses against other income?Average customer use of seven days or less (or thirty days or less with significant personal services) takes the activity out of the rental category; losses are nonpassive only with material participationWhether accelerated deductions reduce tax this year or become suspended losses

The two rules are independent. A property can be nonresidential for depreciation and still produce passive losses, or residential for depreciation and produce nonpassive losses, depending on the facts.

The recovery period question

Residential rental property means a building from which at least 80 percent of gross rental income comes from dwelling units, and a dwelling unit is a house or apartment used to provide living accommodations, but not a unit in a hotel, motel or other establishment more than half of whose units are used on a transient basis. Whether a particular short-term rental is "transient" in this sense is a question of fact your adviser must answer for your property; the answer determines whether the building is 27.5-year or 39-year property.

Either way, land is not depreciable, land improvements are 15-year property, and furniture, appliances and carpeting used in the rental are 5-year property. A furnished short-term rental usually has more of that personal property than a long-term rental of the same size, which is one reason studies are discussed so often for them.

What a study changes for a short-term rental

  • It identifies the personal property and land improvements that are qualified property for bonus depreciation, generally property with a recovery period of 20 years or less. For qualified property acquired after January 19, 2025, the 2025 law provides a permanent 100 percent first-year deduction. The building, at 27.5 or 39 years, is not qualified property.
  • It matters more when the building is 39-year property, because a larger share of the total is otherwise locked in the slowest class.
  • It does not change the passive activity answer. The study produces the deduction; the rules below decide whether you can use it.

The passive activity question

For passive activity purposes, an activity is not a rental activity if the average period of customer use is seven days or less, or thirty days or less where significant personal services are provided. Such an activity is treated as a trade or business, and its losses are nonpassive only if the owner materially participates under the tests in the regulations, which look at hours and the owner's involvement relative to others. Publication 925 explains the exceptions and the material participation tests.

This is the rule behind the widely repeated idea that a short-term rental can generate losses against wages. It can, if the average stay is short enough and the owner materially participates, and those are questions of fact and records: booking data for the average stay, and contemporaneous time logs for participation. An owner who hires a manager and visits twice a year will usually not meet the tests; an owner who cleans, manages bookings, maintains the property and can prove the hours may. Your adviser decides, on your records.

Personal use

If you use the property yourself for more than the greater of 14 days or 10 percent of the days it is rented at fair rental, it is treated as used as a home, expenses are allocated between personal and rental use, and rental expense deductions are limited to rental income. A study on a property with substantial personal use produces deductions that the personal-use rules may then limit. Tell the practitioner and the adviser about personal use before commissioning a study.

Records that decide the answer

Both rules are decided on records, and the records have to exist before the year ends, not be reconstructed in April.

  • Average customer use. Booking platform exports showing each stay's length; the average is computed across the year for the activity, and the seven-day and thirty-day tests are applied to that average.
  • Significant personal services. What was provided beyond the unit itself: daily cleaning, meals, concierge services. This changes which test applies.
  • Material participation. A contemporaneous log of the owner's hours by task and date, and evidence of what others did, because several of the tests compare the owner's participation with everyone else's.
  • Personal use. A calendar of days used personally, by family, or by anyone below fair rental, and days rented at fair rental.
  • The building's use. Evidence supporting the residential or nonresidential classification: the share of units and income from transient stays across the establishment.

A practitioner preparing the study needs the classification answer; the adviser needs all of it. Owners who keep these records as a matter of course have options at year end that owners who do not simply lack.

Recapture and the exit

Depreciation on the 5- and 15-year property a study identifies is recaptured as ordinary income on sale. Short-term rentals are bought and sold more often than long-term holds, and a quick sale can undo the timing benefit. The exit plan belongs in the conversation before the study.

What to settle before commissioning a study

  1. Residential or nonresidential, on the facts, with the adviser.
  2. Average customer stay, from booking records.
  3. Material participation, from time records, honestly assessed.
  4. Personal use, in days.
  5. Acquisition and placed-in-service dates, with documents.
  6. Holding plan and exit.
  7. State treatment.

A practitioner who begins the study without asking about the first four is preparing a study whose result nobody has evaluated.

What people ask on Reddit and other forums

The searches that lead people to these threads are usually phrased "short term rental cost segregation".

The "STR loophole" and "Airbnb cost segregation reddit" threads on r/AirBnB, r/realestateinvesting and r/tax ask the same three things. From the sources below:

"Is my Airbnb 27.5-year or 39-year property?" It depends on whether the units are used on a transient basis under the Code's definition, which is a question of fact for your adviser. Many short-term rentals are treated as 39-year nonresidential property.

"Can I use the losses against my W-2?" Only if the activity is not a rental activity under the seven-day or thirty-day rules and you materially participate under the regulations' tests, with records to prove it.

"I have a property manager. Am I done?" Not automatically, but the tests compare your participation with everyone else's. Keep contemporaneous logs and ask your adviser.

"Does cost seg work better for STRs?" The building often depreciates over 39 years and the furnished contents are substantial, so a study can move more into short classes. Whether the deductions are usable is decided by the passive activity and personal-use rules.

Questions people also ask

Is an Airbnb 27.5-year or 39-year property?

It depends on whether the units are used on a transient basis under the Code's definition, which is a question of fact for your adviser. Many short-term rentals are treated as nonresidential real property with a 39-year building period.

Can I deduct short-term rental losses against my salary?

Only if the activity is not a rental activity under the seven-day or thirty-day rules and you materially participate under the regulations' tests, with records to prove it. Otherwise the losses are passive.

Does cost segregation work better for short-term rentals?

The building often depreciates over 39 years and the furnished contents are substantial, so a study can move a larger share of the basis into shorter classes. Whether the deductions are usable is a separate question decided by the passive activity and personal-use rules.

Does hiring a property manager end material participation?

Not automatically, but it makes the tests harder to meet, because participation is measured against the involvement of others as well as your own hours. Keep contemporaneous records and ask your adviser.

What if I convert a long-term rental to short-term stays?

The classification, the passive activity treatment and possibly the recovery period can change with the use. Tell your adviser before the change, not after the year ends.

Sources