If you own a short-term rental and plan to use the STR loophole on your 2026 return, most of what decides the outcome happens before December 31, not in April. Both tests that matter, the average guest stay and your material participation hours, are measured over the calendar year. Once the year closes, the numbers are what they are.
Here's a practical checklist for the next two months. (General information, not tax advice. Your CPA has the final word on your situation.)
1. Work out your average guest stay so far
The STR loophole starts with one number: the average period of customer use. If it's 7 days or less for the year, the property generally isn't treated as a "rental activity" under the passive loss rules.
Export every booking for 2026 from Airbnb, Vrbo or your channel manager, add up the nights, and divide by the number of stays. Your own personal stays don't count as guest stays, so leave them out of this math.
If you're close to 7, look at what's already booked for November and December. A single 30-night winter booking can push a borderline average over the line.
2. Count your hours against the right test
Not being a "rental activity" only gets you to the starting line. The losses are non-passive only if you materially participate. For most hosts that means one of two tests:
- The 100-hour test: more than 100 hours, and at least as many hours as any other individual.
- The 500-hour test: more than 500 hours, no comparison needed.
Add up what you've logged through October. If you're at 70 hours with two months left, you know exactly how much ground there is to cover, and it's real work that counts: guest communication, turnovers you handle yourself, repairs, restocking, bookkeeping, pricing.
3. Estimate your cleaner's and co-host's hours too
This is the part of the 100-hour test people forget. If your cleaner spent 120 hours on the property this year and you spent 110, you fail the test even though you're over 100.
Pull this year's invoices from cleaners, handymen and any co-host. Turn them into an hours estimate now, while you can still change the outcome by taking on more of the work yourself in November and December.
4. Fill gaps in your log now, not in April
The IRS and the Tax Court look hard at hour logs built long after the fact. The closer your records are to the day the work happened, the more weight they carry.
If you haven't been logging, start today and log as you go. For the earlier months, rebuild what you can from evidence you already have (booking messages, calendar entries, receipts, texts with your cleaner) rather than estimating from memory. A free material participation log template or an app such as PropHours, an STR loophole hour tracker, keeps each entry with a date, a description and a duration.
5. If you're buying, mind "placed in service"
Depreciation starts when a property is placed in service, meaning ready and available for rent, not when you close. The law signed on July 4, 2025 made 100% bonus depreciation permanent for eligible property acquired and placed in service after January 19, 2025. That covers furniture, appliances and the shorter-life components a cost segregation study identifies; the building itself is still depreciated over 27.5 years.
The catch: a December closing still needs the average-stay math and the participation hours for 2026. Buying late compresses the time you have to earn both. Bonus depreciation creates a paper loss; it doesn't create hours.
6. Don't wait for the cost segregation study
A cost segregation study doesn't have to be finished by December 31. What matters for the year is when the property was placed in service. If you're considering one, get quotes now, but focus your year-end energy on the hours and the stay data, which can't be fixed later.
Want a rough sense of what's at stake first? The STR loophole calculator estimates the tax savings from a first-year loss.
7. Track your miles
Drives to the property for turnovers, repairs and supply runs are generally deductible, and they also back up your hour log, because a trip on a given date supports the work you logged that day. A rental property mileage log with date, destination, purpose and miles is enough.
8. Keep personal days separate
Personal use doesn't enter the average-stay calculation, but it does matter under the vacation home rules. If you use the property for more than 14 days, or more than 10% of the days it's rented at a fair price, whichever is greater, your deductions can be limited. Holiday stays add up fast, so count them before you book the family in for New Year's.
9. Know the limits that still apply
Two common surprises:
- There's no income phase-out on the STR loophole itself, unlike the $25,000 rental loss allowance. W-2 earners with high incomes can still use it, though separate loss caps such as the excess business loss limit can matter at the top end. The details are in this piece on the STR loophole income limit.
- If you don't qualify, the loss isn't gone. It's passive, gets reported on Form 8582, and carries forward until you have passive income or sell the property.
The short version
By December 31 you want three things in a folder for your CPA:
- A booking export showing every 2026 stay and the average length.
- A dated log of your own hours on the property.
- Invoices or notes showing what everyone else did, so the 100-hour comparison can be checked.
That's the same file an auditor would ask for. If it's done in December, tax season gets a lot calmer.
Top comments (0)