The short-term rental tax strategy · updated July 2026

How to qualify for the “STR loophole”

It isn’t really a loophole — it’s the ordinary application of Section 469’s regulations to short-term rentals. What fails in practice is rarely the concept; it’s the qualification facts and the documentation. Here is what qualifying actually requires, in plain English.

The strategy people call the STR loophole rests on one regulatory distinction: under IRS rules (Section 469 and its regulations), a rental whose average guest stay is seven days or less isn’t treated as a passive “rental activity.” If you also materially participate in running it, losses from the property — often front-loaded by cost segregation and bonus depreciation — can potentially offset non-passive income, including W-2 wages. It’s not automatic, and it’s not a trick: you must actually meet the tests, and you must be able to prove it. Whether the strategy fits your situation is a question for your CPA.

Requirement 1 — the 7-day average stay

Take your total guest-stay days for the year and divide by the number of stays. If the average is seven days or less, the property isn’t a “rental activity” under the passive-loss rules — it’s treated more like a hotel-style trade or business. A property that mixes weekend guests with a few month-long bookings can fail this on the math, so it’s worth tracking through the year, not discovering in March.

Requirement 2 — material participation

This is where qualification is won or lost. The regulations offer seven tests; three carry almost all real-world cases:

• 500 hours — you participate more than 500 hours in the year.
• Substantially all — your participation is substantially all of the participation in the activity (yours and everyone else’s combined).
• 100 hours and more than anyone else — the most-used test: you participate more than 100 hours, and no other individual — including non-owners like a property manager, cleaner, or handyman — participates more than you do.

That last clause is the trap most owners miss. Hiring help doesn’t automatically disqualify you — but under the 100-hour test, your cleaner’s hours compete with yours. Courts have ruled against owners who couldn’t show other people’s hours at all (Pohoski v. Commissioner). If your cleaner logs 150 hours and you log 120, you don’t meet that test — which is why careful owners track everyone’s time on the property, not just their own.

Requirement 3 — records that survive scrutiny

The regulation technically allows participation to be shown by “other reasonable means.” In practice, courts have repeatedly rejected records built after the fact as “a post-event ‘ballpark guesstimate’” (Moss, Almquist, and — in an STR case decided in 2025 — Mirch). Logs created while a case was already pending have been thrown out (Sezonov). Identical round-number entries read like someone working backward from a target. The IRS’s own audit guide tells examiners to look at time spent by others — cleaning fees, management agreements — precisely to test whether much was left for the taxpayer to do.

The pattern in the case law is consistent: a contemporaneous log — entries made as the work happens, categorized, with the surrounding evidence (messages, invoices, photos) — is what holds up. A spreadsheet reconstructed in March is what doesn’t.

Does it still work in 2026?

Yes, with a nuance worth knowing: legislation passed in July 2025 restored 100% bonus depreciation for qualifying property acquired after January 19, 2025 — replacing the phase-down schedule you may still see cited in older articles. The material-participation and average-stay requirements are unchanged. Timing and eligibility depend on your facts; confirm with your advisor.

Buying late in the year?

A December start is harder, not impossible. Your hours only begin counting once you’re in the activity, and you still need to meet a test by December 31 — so compressed, well-documented hours matter most in a late-year setup. This is the single most-asked question in owner forums for good reason: it’s exactly where thin documentation sinks otherwise-qualified owners.

Common questions

Key & Acorn is software, not a tax advisor. Nothing on this page is tax advice; qualification depends on your circumstances. Talk to your CPA. Case references (Moss, Almquist, Sezonov, Mirch, Pohoski) are cited as published court decisions discussing recordkeeping and participation; read them with your advisor.