Sarah's situation
Dr. Sarah Hernandez is 44, a cardiothoracic surgeon at a major Denver hospital. Her W-2 is $750K — base salary plus call coverage and surgical productivity bonuses. She's on call most weekends. Her husband Tom is a research scientist making $145K. Joint AGI: $895K, top federal bracket plus 4.4% Colorado state tax.
Sarah and Tom bought a $920K 3-bedroom Aspen property in 2024 for STR use. Average guest stay is 5.1 nights — mix of ski-week stays in winter and 3-4 night summer stays. They visit themselves about 6 weeks a year (carefully tracked under §280A's personal-use rules). Sarah has hired a local Aspen co-host, Marie, who handles ground operations: cleanings, guest meet-and-greet, on-site issues. Sarah handles bookings, listing optimization, vendor coordination, and the financial/tax side from Denver.
Sarah's question to her CPA: "Can I do cost segregation on this and have it actually work, given my work schedule?" The CPA's honest answer: "It works on paper. The audit risk is whether your material participation hours hold up. We need to be careful."
Why Sarah cannot qualify under REPS
Real Estate Professional Status under IRC §469(c)(7) requires (1) more than half of your personal services to be in real-property trades, AND (2) 750+ hours per year materially participating in real property. Sarah works ~2,400 hours per year as a surgeon — more than half her time. She'd need to log more than 2,400 hours in real estate to clear the "more than half" prong. Mathematically impossible alongside her surgical practice.
Tom (the research scientist husband) also can't qualify — his 1,900 work hours dominate his service hours. Neither spouse can credibly claim REPS. The only remaining door is the STR exception.
The STR exception, in Sarah's situation
Under Treas. Reg. §1.469-1T(e)(3)(ii), property with average customer use of 7 days or less is NOT classified as a rental activity for §469 purposes. Combined with material participation, the resulting losses are non-passive and offset W-2 income.
Sarah's 5.1-night average clears the first prong. The second prong — material participation — is where surgeons run into trouble. Under IRC §469(h), the most common test is "more than 100 hours AND more than anyone else." Sarah needs to log 100+ hours AND no one else (including Marie the co-host) can log more than her.
How Sarah hits 100+ hours from Denver:
- Bookings management (responding to inquiries, modifying reservations, dynamic pricing): ~3 hours/week × 50 weeks = 150 hours
- Vendor coordination (cleaners, repairs, suppliers): ~30 hours/year
- Listing optimization and marketing: ~20 hours/year
- Bookkeeping and tax documentation: ~15 hours/year
- Quarterly site visits (work, not personal): ~16 hours/year
- Total documented hours: ~230
Marie the co-host logs ~180 hours/year on ground operations (cleanings supervision, in-person guest issues, on-site maintenance). Sarah's 230 vs. Marie's 180 keeps Sarah dominant. The test passes.
The math, worked
| Line | Amount | Source |
|---|---|---|
| Purchase price | $920,000 | closing docs |
| Land allocation (26%) | −$239,200 | Pitkin County |
| Depreciable basis | $680,800 | computed |
| 5/15-yr reclassification (≈30% STR) | $204,240 | benchmark |
| FF&E (high-end Aspen finishes) | +$32,000 | receipts |
| Total reclassified | $236,240 | computed |
| OBBBA bonus dep (100%) | $236,240 | §168(k) |
| Federal tax savings @ 37% | $87,409 | — |
| Colorado state savings @ 4.4% | $10,395 | CO bracket |
| Total year-1 tax savings | $97,804 | — |
Study fee: $1,295. ROI: 75×. Net benefit: $96,509 on the 2026 joint return.
The audit trap: surgeon-specific risks
The IRS audits material participation more than almost any other rental position. Physicians are a frequent target because the math is suspicious on its face: how does a full-time surgeon log 200+ hours on a vacation rental? Cases like Hakkak v. Commissioner have established that retrospective hour reconstructions don't survive Tax Court scrutiny.
Three specific risks Sarah needs to manage:
1. Co-host hour ratio
If Marie ever logs more than Sarah in any year, Sarah fails the material participation test for that year. Sarah needs to monitor this in real time. If Marie's hours start creeping up (say, taking over more of the booking management because Sarah is busy with surgical conferences), Sarah needs to either log more herself or shift Marie's role.
2. Contemporaneous documentation
Calendar entries dated the day they happened. Email threads with vendors. Booking system audit logs. Sarah cannot reconstruct 230 hours retrospectively in February when she's preparing for filing. She has to log them throughout the year. Many physician clients use a simple Google Calendar tagged with "STR" entries that they fill in on the day work happens.
3. Personal use accounting
Under §280A, personal use of the property is tracked separately. Days Sarah is at the Aspen property for her own family vacation don't count as material participation hours — they count as personal use. If personal use exceeds 14 days OR more than 10% of rental days, the property converts to a different deduction framework that limits losses to rental income. Sarah's 6 weeks of personal use (42 days) compared to ~150 rental days = 28% — that's over the 10% threshold. She needs to be careful here.
For Sarah's specific facts, the property might fall under §280A's "rental + personal use" hybrid regime, which significantly limits the cost-seg loss to the extent of net rental income. Her CPA should run that analysis explicitly. If the personal use percentage is too high, the cost-seg deduction stays trapped within the rental's income, and the W-2 offset gets blocked.
The decision tree
When the surgeon strategy fails
- Personal use over 10% of rental days. §280A converts the property to mixed-use and traps the loss inside rental income.
- Property manager runs everything. If Marie (or whoever) handles bookings, communications, and operations, Sarah likely fails material participation. This is the most common surgeon failure mode.
- Reconstructed hours. Backwards-looking hour logs don't survive Tax Court. If you don't have contemporaneous documentation, don't claim the deduction.
- Average stay creeps over 7 in winter. Mountain properties with ski-week bookings can drift. Run the actual average across the calendar year.
- Selling within 2-3 years. §1245 recapture at ordinary rates eats the front-loaded benefit.
What Sarah should actually do
The strategy works on her facts, but the documentation discipline has to be airtight. Specifically: install a Google Calendar dedicated to STR work, log every interaction in real time, save email threads with Marie and vendors, and review the cumulative hours quarterly with her CPA. If she starts a new surgical role that consumes more time, reassess whether she can still hit the hours threshold.
For audit defense specifically, see costsegaudit.com for the IRS Audit Techniques Guide walk-through and what documentation actually wins material participation challenges. For the universal framework on the STR loophole, see the shouldicostseg.com pillar guide.
Order the study, document the hours.
Cost Seg Smart's $1,495 study captures STR-specific reclassification with FF&E uplift. We provide a contemporaneous hours-log template at no charge for physician clients.
Disclosure. This page is operated by Cost Seg Smart LLC. The "order a study" CTA routes to costsegsmart.com, the same operator. Numbers in the worked example are modeled from Cost Seg Smart's 2026 benchmarks dataset (n=260 studies). Your actual study will differ. Nothing on this page is tax, legal, or financial advice — consult a qualified CPA.