The short-term rental tax loophole, explained
Updated October 1, 2026 · 9 min read · By STRROI Research
High-income investors buy short-term rentals for more than cash flow. Under the right conditions, losses from an STR, usually created on paper by cost segregation and bonus depreciation, can offset W-2 and business income. This guide covers what has to be true, how the numbers work, and the mistakes that get people in trouble.
Why rental losses are normally stuck
Under the passive activity rules (Internal Revenue Code section 469), rental real estate is passive by default. Passive losses can only offset passive income. The $25,000 special allowance for landlords who actively participate phases out as modified adjusted gross income rises from $100,000 to $150,000, so most high earners get nothing from it.
The usual way around this is real estate professional status, which requires more than 750 hours a year in real estate and more than half of your working time. That is close to impossible with a full-time job. Short-term rentals open a different door.
The exception: an average stay of 7 days or less
Treasury Regulation 1.469-1T(e)(3)(ii)(A) says an activity is not a rental activity for passive loss purposes when the average period of customer use is 7 days or less. A second exception covers an average stay of 30 days or less when significant personal services (think hotel-style daily cleaning or meals) are provided.
Average period of customer use is total nights rented divided by the number of stays. A property booked for 210 nights across 60 stays averages 3.5 days, which qualifies. A few monthly bookings can push the average over 7, so watch it during the year.
Then you have to materially participate
Escaping the rental definition makes the STR an ordinary business activity. Its losses are only non-passive if you materially participate, using one of the tests in Treasury Regulation 1.469-5T(a). The three investors rely on most:
- 100 hours and more than anyone else. You spend more than 100 hours in the year, and more than any other individual, including your cleaner, co-host or property manager.
- 500 hours. More than 500 hours in the year on the activity.
- Substantially all. You do substantially all of the work yourself.
Hours that usually count: guest messaging, pricing, coordinating cleaners and repairs, furnishing and setup, managing listings. Hours that usually do not: reviewing statements and other investor-type activity. A full-service property manager often logs more hours than the owner, which can sink the 100-hour test. Keep a running time log as you go, not a reconstruction at tax time.
Where the big deduction comes from: cost segregation and bonus depreciation
A building is normally depreciated over decades. Short-term rentals with short average stays are generally not treated as residential rental property (transient use is excluded), so many are depreciated over 39 years. A cost segregation study breaks out the parts that have shorter lives: appliances, furniture, cabinets, some flooring and fixtures (5 and 7 year property) and land improvements like driveways, decks and landscaping (15 year property). Studies commonly reclassify 20% to 30% of the building basis.
Bonus depreciation then lets you deduct those shorter-life components immediately. The One Big Beautiful Bill Act, signed in July 2025, permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025. Land is never depreciable.
A worked example
| Step | Amount |
|---|---|
| Purchase price | $450,000 |
| Land (assume 20%, not depreciable) | $90,000 |
| Building basis | $360,000 |
| Reclassified by cost segregation (assume 25%) | $90,000 |
| First-year bonus depreciation on those parts | $90,000 |
| Federal tax saved if fully usable at a 35% bracket | about $31,500 |
The remaining building basis keeps depreciating normally. When you sell, depreciation you took is generally recaptured and taxed, so this is often a deferral rather than a permanent saving. Very large losses can also run into the excess business loss limits.
State rules differ. Some jurisdictions, including California and Washington, DC, do not follow federal bonus depreciation, so the state deduction can be much smaller.
Common mistakes
- Letting the average stay creep above 7 days with a handful of long bookings.
- No time log. Material participation is the most audited part of this strategy.
- A manager doing most of the work, which can fail the 100-hour test.
- Heavy personal use. Using the property yourself for more than the greater of 14 days or 10% of rented days can make it a residence for tax purposes and limit losses.
- Buying a bad deal for the tax break. A one-time deduction does not fix a property that loses money every month. Underwrite the property on its own first.
See every listing in a market, rated
STRROI underwrites every home for sale in a ZIP code as a short-term rental and ranks them 1 to 10. Try it on a sample market, no sign-up needed.
Talk to a CPA who knows STRs
This article is general education, not tax advice. Whether you qualify depends on your facts. Work with a CPA who handles short-term rentals before you buy, and again before you file.
Questions
Does the short-term rental loophole still work in 2026?
Yes. The 7-day average stay rule and the material participation tests are unchanged, and the One Big Beautiful Bill Act made 100% bonus depreciation permanent for qualifying property acquired and placed in service after January 19, 2025.
Do I need real estate professional status?
No. That is the point of the STR exception. With an average stay of 7 days or less, the activity is not a rental activity, so you need material participation instead of real estate professional status.
Can I use a property manager and still qualify?
Possibly, but it is harder. Under the 100-hour test you must spend more time than any other individual, and a full-service manager or cleaner may log more hours than you. Many investors who use this strategy self-manage or use a limited co-host.
How much can cost segregation save?
Studies commonly reclassify 20% to 30% of a building's basis into shorter-life property. With 100% bonus depreciation that portion can be deducted in year one. On a $450,000 purchase that can mean a first-year deduction near $90,000, but your result depends on the study and your situation.
See every listing in a market, rated
STRROI underwrites every home for sale in a ZIP code as a short-term rental and ranks them 1 to 10. Try it on a sample market, no sign-up needed.