Written for CPA firms and tax advisors with short-term-rental clients. Property owners: the plain-language version of the STR strategy is in our short-term rental cost segregation guide.
When an STR client's non-passive treatment fails, it almost never fails on the seven-day average-stay computation, which is factual and easy to pull from booking data. It fails on material participation: hours that were never logged, a co-host who out-worked the client, or activities that do not count. This is the part of the engagement worth systematizing.
The tests that matter in practice
Reg. 1.469-5T provides seven tests; one is enough. Three do the work for STR clients:
- Test 1, 500 hours. Clean when met, but rare for a single property with a day job.
- Test 3, more than 100 hours and not less than anyone else. The workhorse. The comparative clause is the trap: the client's 120 hours fail if the cleaner, co-host, or manager logged 200. Both sides of the comparison need support.
- Test 4, significant participation activities aggregating over 500 hours. Useful for clients with several 100-plus-hour activities; more complex to document and defend.
Spousal hours aggregate under Section 469(h)(5), which rescues plenty of two-earner clients: participation of a spouse counts toward the tests whether or not a joint return is filed.
What counts, and what quietly does not
Operational involvement counts: guest communication, managing listings and pricing, coordinating turnovers, overseeing maintenance, handling check-ins and guest issues. Two categories get clients in trouble. Investor-type activity (reviewing financials, researching markets, education courses) generally does not count under 1.469-5T(f)(2)(ii) unless the client is involved in day-to-day management. And travel time to the property is contested ground; advise clients not to build a claim on it.
The structural disqualifier is full-service property management. A client whose manager handles communication, pricing, turnovers, and maintenance has usually both failed to accumulate countable hours and lost the Test 3 comparison to the manager's staff. Using individual service providers (a cleaner, a handyman, a co-host for defined tasks) is compatible with participation, provided the client remains the person directing the operation. The distinction to probe: outsourced tasks versus outsourced management.
The documentation checklist to hand your client
Courts accept reasonable means of substantiation, but reconstructed logs written after an IDR arrives fare poorly. Give STR clients this list at engagement start, as a standing expectation for every tax year they claim the treatment:
- Contemporaneous hours log: date, activity, time spent, kept as the year runs (a spreadsheet or calendar is fine)
- Booking export from every platform, showing stay lengths for the average-stay computation
- Platform message history (guest communication timestamps corroborate the log)
- Agreements with any co-host, cleaner, or manager, defining who does what
- An estimate of others' hours on the activity, supporting the Test 3 comparison
- Receipts and records of maintenance, supply runs, and improvement oversight
None of it is filed with the return; all of it is what stands between the client and a recharacterized loss if the year is examined.
Why the hours are worth the trouble
Participation determines the character of the loss; a cost segregation study determines its size. For a furnished STR acquired after January 19, 2025, the study plus 100% bonus depreciation routinely produces a first-year loss in the tens of thousands, and material participation is what lets that loss reach the client's W-2 and business income rather than waiting in the passive column. The full qualification chain is in our STR strategy guide for advisors.
Long-term rental clients are on a different road entirely: over-seven-day rentals stay per-se passive regardless of participation, and reaching ordinary income requires real estate professional status under Section 469(c)(7), a substantially higher bar (750 hours, more than half of personal-service time in real property trades or businesses).
For firms with STR-heavy books: your client's facts and participation determine the tax treatment; the study documents asset classifications. RentalWriteOff prepares STR studies under your firm's brand or by referral and supports questions about the deliverable and methodology. Your firm handles qualification and filing advice. See the partner programs or more resources for tax professionals.