Short answer
The rule behind the "STR loophole" is a definition, not a loophole. For the passive activity rules, 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. A short-term rental that meets that test is a trade or business, and its losses, including a large first-year loss from a cost segregation study and bonus depreciation, are nonpassive if the owner materially participates. Real estate professional status is not required. Material participation is decided by seven tests in the regulations, most often the 500-hour test, the substantially-all test, or the more-than-100-hours-and-not-less-than-anyone-else test, and it is proven with records that any reasonable means can supply but that must actually exist. This article sets out the tests, the participation rules, the records and the traps. It is general education, not tax advice.
Step 1: is it a rental activity at all?
| Average period of customer use | Personal services | Treatment |
|---|---|---|
| Seven days or less | Any | Not a rental activity; a trade or business |
| Thirty days or less | Significant personal services provided | Not a rental activity |
| More than thirty days, or more than seven without significant services | — | A rental activity; passive unless real estate professional rules apply |
The average is computed for the activity over the year from the booking records. Significant personal services are services beyond those needed to permit the use of the property, such as daily cleaning or meals; the regulations give the tests. An owner whose average stay is under seven days does not need real estate professional status; an owner whose average is over thirty days does.
Step 2: the seven material participation tests
- More than 500 hours in the activity during the year.
- Substantially all of the participation in the activity by all individuals, including non-owners, was yours.
- More than 100 hours, and not less than the participation of any other individual, including employees, managers and cleaners.
- Significant participation activities. The activity is one in which you participated more than 100 hours, and your total participation in all such activities exceeded 500 hours.
- Five of the preceding ten years of material participation in the activity.
- Personal service activity in which you materially participated in any three preceding years; rarely relevant to rentals.
- Facts and circumstances: regular, continuous and substantial participation during the year, with participation of 100 hours or less never sufficient.
For a self-managed short-term rental, tests 1, 2 and 3 do the work. Test 3 is where property managers and cleaning services matter: if a cleaner or a manager put in more hours than you, you fail test 3 and need test 1 or 2.
What counts as participation
Participation is work done in connection with an activity in which you own an interest: guest communication, bookings, cleaning, maintenance, purchasing supplies, repairs, marketing, and management of the people who do those things. Two kinds of work do not count: work not customarily done by an owner if one of its principal purposes is to avoid the passive rules, and work done as an investor, such as reviewing financial statements or monitoring operations in a non-managerial capacity, unless you are directly involved in day-to-day management. Travel time and study time are contested areas; ask your adviser.
A spouse's participation is treated as yours for material participation, whether or not you file jointly.
Records
Publication 925 says participation may be established by any reasonable means, including appointment books, calendars or narrative summaries, and that contemporaneous daily time reports are not required if participation can be shown by other reasonable means. The practical reading of that sentence, from the cases owners lose, is: keep a log anyway. Record the date, the task, the property and the hours as they happen; keep the booking platform exports for the average-stay computation; keep invoices and communications showing what cleaners and managers did and for how long, because test 3 compares your hours with theirs. A narrative written after a notice arrives is what examiners are trained to discount.
How this connects to cost segregation
A short-term rental is often nonresidential real property, because units used on a transient basis are not dwelling units, so the building is 39-year property and a larger share of the basis is otherwise locked in the slowest class. A study identifies the 5-, 7- and 15-year property, including the furnishings a short-term rental carries, and for property acquired after January 19, 2025 that property qualifies for the permanent 100 percent bonus rule. The result can be a large first-year loss. Whether that loss offsets wages or other income depends entirely on steps 1 and 2 above. The study does the arithmetic; the material participation record decides who can use it.
Traps
- The average stay drifts. A property that averaged five-day stays last year and twelve-day stays this year changed category. Check the booking data every year.
- The manager out-participates you. A full-service manager with cleaners can easily exceed your hours, defeating test 3; tests 1 and 2 then require substantial personal time.
- Personal use. Days you use the property are not participation, and substantial personal use brings the vacation-home limits into play.
- Co-owners. Each owner's participation is tested for that owner; a partner who does nothing has passive losses even if you do not.
- Aggregating with long-term rentals. Short-term rentals that are not rental activities are not grouped with rental real estate under the real estate professional election; grouping rules for trades or businesses are separate. Ask your adviser before grouping anything.
- Investor hours. Reading listings, studying markets and reviewing statements do not count.
What people ask on Reddit and other forums
The "STR loophole" is one of the largest topics in "cost segregation reddit" threads on r/AirBnB, r/realestateinvesting and r/tax. The searches that lead people to these threads are usually phrased "material participation short term rental" and "100 hour rule short term rental".
"Do I need to be a real estate professional for the STR loophole?" No. If the average stay is seven days or less, the activity is not a rental activity; material participation alone makes the losses nonpassive.
"I use a co-host who does the turnovers. Do I still qualify?" Maybe. Under test 3 your hours must exceed 100 and not be less than the co-host's. Otherwise you need more than 500 hours or substantially all participation.
"What if my average stay is nine days?" Then the seven-day exception does not apply, and the thirty-day exception applies only with significant personal services. Otherwise it is a rental activity and the real estate professional rules govern.
"Do I really need a log?" The publication allows any reasonable means, but a contemporaneous log is what actually survives an examination. Keep one.
Questions people also ask
What is the STR loophole?
A regulation providing that an activity with an average customer use of seven days or less, or thirty days or less with significant personal services, is not a rental activity for the passive activity rules, so its losses are nonpassive if the owner materially participates.
How many hours do I need for material participation?
More than 500, or substantially all of everyone's participation, or more than 100 and not less than any other individual, are the tests owners most often meet. Four other tests exist.
Does my spouse's time count?
Yes, for material participation, whether or not you file jointly.
Does hiring a property manager end material participation?
Not automatically, but under the 100-hour test your hours must not be less than the manager's; otherwise you need the 500-hour or substantially-all test.
Is a short-term rental 27.5-year or 39-year property?
It depends on whether the units are used on a transient basis under the Code's definition; many short-term rentals are nonresidential real property with a 39-year building period.
Sources
- https://www.law.cornell.edu/cfr/text/26/1.469-1T — 26 C.F.R. §1.469-1T(e)(3), exceptions to rental activity.
- https://www.law.cornell.edu/cfr/text/26/1.469-5T — 26 C.F.R. §1.469-5T(a), material participation tests.
- https://www.irs.gov/publications/p925 — IRS Publication 925 (2025), Passive Activity and At-Risk Rules: material participation tests; participation; proof of participation; participation of spouse.
- https://www.law.cornell.edu/uscode/text/26/168 — 26 U.S.C. §168(e)(2)(A) and §168(c).
- https://www.irs.gov/newsroom/treasury-irs-issue-guidance-on-the-additional-first-year-depreciation-deduction-amended-as-part-of-the-one-big-beautiful-bill — IR-2026-06 (January 14, 2026), bonus depreciation guidance.
Related reading
- Short-term rentals and cost segregation
- The real estate professional test explained
- Why a deduction is not a refund
- Passive loss carryforwards: what happens to suspended losses
- Is cost segregation worth it? A decision checklist
- What Reddit asks about cost segregation, answered with sources
- Find a practitioner in the NBCSS directory