PROP HOURS BLOG

The STR Loophole (Short-Term Rental Tax Loophole), Explained

By Lucas, Founder of PropHours · Updated October 15, 2026

Buy an Airbnb, generate paper losses, deduct them against your salary. That is the pitch behind the short-term rental tax loophole, better known as the STR loophole — and unlike most tax TikTok, it is built on a real regulation. But the loophole has a gate, and the gate is material participation: no hours, no deduction. Here is what the rule actually says, the myths that get people in trouble, and the records that make it real.

What the STR loophole actually is

It is not a loophole in the sneaky sense. It is a defined exception in the passive activity regulations. Temporary Regulation §1.469-1T(e)(3)(ii) says an activity is not a "rental activity" if either:

• The 7-day rule: the average period of customer use is 7 days or less; or
• The 30-day rule: the average period of customer use is 30 days or less and significant personal services are provided (think daily housekeeping, concierge-style guest services — the hotel model).

Most Airbnb and Vrbo properties, with average stays of two to four nights, satisfy the 7-day rule comfortably. The regulation simply declines to call that a "rental activity" — and that classification changes everything downstream.

How to calculate your average guest stay

The average period of customer use has a precise definition in Treasury Regulation §1.469-1(e)(3)(iii): add up the days in every guest stay during the year, then divide by the number of stays. To do it for your own bookings, paste them into our free 7-day rule calculator.

• Count guest stays only. Each booking in which a guest has the right to use the property is one period of customer use. Your own stays are not.
• An extension is one stay, not two. The regulation treats a continuous right to use the property as a single period, even if the guest renews or extends.
• Days or nights: pick one and stay consistent. The regulation counts days but doesn’t say how to count a check-in-to-check-out stay. Most hosts and CPAs use booked nights.
• Stays around New Year. Only stays that end during the tax year, or that include its last day, count toward that year.
• More than one property. Compute the average for each activity. If several properties are treated as one activity, ask your CPA how to combine them — the regulation weights them by rental income.

Long bookings are the thing to watch, and they hit low-volume properties hardest:

Two monthly-style bookings take the quiet condo from 3.6 to 10.0 nights, and the 7-day exception fails for the whole year. Check your running average before accepting a long booking, and consider a maximum-stay setting on your listing if you rely on the 7-day rule.

Why "not a rental activity" matters

Section 469(c)(2) treats rental activities as passive per se — automatically, regardless of participation. That is the wall most landlords hit: their losses are trapped in the passive box and cannot offset W-2 or business income.

If your short-term rental is not a rental activity under the regulation, the per se rule never attaches. The activity is tested like any other business: if you materially participate, its losses are non-passive and can generally offset your other income. No Real Estate Professional Status required — that is precisely why this route is so popular with high earners who could never pass the REPS hour tests.

The catch: you must materially participate

Escaping the rental-activity label only gets you to the starting line. The losses are non-passive only if you materially participate under one of the seven tests. For STR owners, the realistic paths are:

• The 100-hour test: more than 100 hours and at least as much as any other individual. The most common STR route — but watch the comparison side: your cleaner's hours count against you.
• The 500-hour test: more than 500 hours in the activity. Achievable for hands-on hosts who self-manage everything.
• The substantially-all test: your participation is substantially all of the total participation. Fits solo operators with minimal outside help.

Without material participation, the losses stay passive and the "loophole" does nothing for you. Every version of this strategy that works has an hour log behind it; every version that fails is missing one.

Common myths that get people in trouble

"Buy any Airbnb and deduct." The property does not create the deduction — your participation does. A turnkey STR run entirely by a management company gives you no participation hours at all.

"It works with a full-service manager." Your manager's hours are not yours, and under the 100-hour test they sit on the other side of the comparison. Heavy third-party involvement is the single most common reason STR loss claims fail.

"Personal use doesn't matter." It does, just not in the average: your own stays aren’t guest stays, so they stay out of the calculation. But personal use counts under the vacation home rules, which can limit your deductions. Keep guest days and personal days cleanly separated in your records.

"Buy in December, deduct the full year." You still need the average-use math and the participation hours for the year. A late purchase compresses the time you have to build both — and bonus depreciation on a December closing does not create participation hours.

"Cost segregation alone does it." A study creates the paper loss; material participation makes it usable. They are two halves of one strategy, and the second half is the one people skip.

Real-world example

Priya owns a cabin in the Smoky Mountains listed on two platforms. For the year: 210 rented nights across 66 stays — an average stay of about 3.2 days. Under the 7-day rule, the cabin is not a rental activity.

She logs 140 hours: guest messaging and reviews, dynamic pricing adjustments, coordinating her cleaner, restocking, and handling two minor repairs herself. Her cleaner logs 90 hours for turnovers. Priya's 140 clears 100 and exceeds every other individual's hours — the 100-hour test is met, and the cabin's losses (amplified by a cost segregation study) are non-passive.

What made it defensible was not the total but the file: dated log entries with task descriptions, platform message threads, the cleaner's invoices (which conveniently prove the comparison side too), and the booking export showing each stay's length. If the cleaner had logged 150 hours instead of 90, the 100-hour test would have failed — same property, same effort by Priya, opposite result. The comparison is the test.

2026 update: 100% bonus depreciation is back for good

The paper loss behind this strategy usually comes from depreciation, and the rules changed in 2025. The law signed on July 4, 2025 made 100% bonus depreciation permanent for eligible property acquired and placed in service after January 19, 2025. Furniture, appliances and the 5-, 7- and 15-year components a cost segregation study identifies can be written off in the first year; the building itself cannot. It is depreciated over 27.5 years, though many CPAs use 39 years for a short-term rental, because a building rented mostly to transient guests may not count as residential rental property. Property acquired before January 20, 2025 stays on the old phase-down schedule, and some states, such as California, do not follow federal bonus depreciation.

A bigger first-year deduction makes the other gates matter more, not less: the loss offsets W-2 income only if the average-stay test and material participation both hold that year. Size the numbers with our STR loophole tax savings calculator, and see how furniture and setup costs are handled in Are Airbnb Startup Costs Tax Deductible? Closing late in the year? Buying a short-term rental in December shows how little time that leaves to meet both.

What can still limit the deduction

Even with everything above satisfied, two further limits can apply: the at-risk rules (§465), which generally cap losses at amounts you are economically at risk for, and the excess business loss limitation (§461(l)), which caps the total business losses an individual can claim in a year. Neither is specific to STRs, but both can bite exactly the high earners this strategy attracts. Your income alone doesn’t limit the deduction, though — see why the short-term rental tax loophole has no income limit. Model the full picture with your CPA — the strategy has three gates, not one.

How to document an STR loss claim

Your file needs three pillars. First, the average-use computation: an annual booking export showing every stay's length. Second, your participation: a contemporaneous hour log with what you did, when, and for how long — PropHours timers, voice notes, and attached receipts are built for this. Third, the comparison: invoices or agreements showing what cleaners, co-hosts, and managers did, so your CPA can verify the 100-hour comparison instead of asserting it. Build all three during the year, not the following April.

Related reading

Master the test most STR owners rely on: the 100-hour material participation test. Pair the strategy with our cost segregation calculator to size the paper losses, and compare with the heavier REPS route for long-term rentals.

This article explains the short-term rental exceptions under Temp. Reg. §1.469-1T(e)(3)(ii) in general terms and is not tax advice. Whether your activity qualifies depends on your facts; review IRS Publication 925 and consult a qualified tax professional. PropHours records the work you log — it does not determine tax eligibility.