Part 1
How short-term rental owners in Mammoth, Park City, and Blue Ridge can keep professional management in place — without losing six figures of bonus depreciation.
Part 1 of 4 — STR Loophole Series · The Concept
Quick note up top — I’m not a CPA, attorney, or tax advisor. This piece is education from the property-management side, not tax, legal, or financial advice. See the full disclaimer at the bottom.
Most short-term rental owners we talk to bought their property for two reasons: cash flow and tax savings. Specifically, the magic words — “STR loophole.”
Then they call their CPA, mention they’re hiring a property manager, and the conversation gets uncomfortable.
“If someone else manages the property,” the CPA says, “you might lose your material participation. And if you lose material participation, you lose the loophole.”
Suddenly the owner is staring at a false choice: manage the property yourself and hand over your weekends to spreadsheets and 11 p.m. guest texts, or outsource it and walk away from a six-figure tax deduction.
We hear this every week — from owners in Mammoth Lakes, Park City, Deer Valley, and Blue Ridge.
It’s a false choice. You can do both. But you have to do it on purpose.
What the “STR Loophole” Actually Is
Quick refresher — and a disclaimer up front: this is education, not tax advice. Talk to your CPA before making decisions.
The “STR loophole” is shorthand for what happens when a short-term rental — average guest stay of seven days or less — is treated as a non-passive trade or business under IRC §469. When that’s the case, paper losses from the property (including the often massive losses generated by a cost segregation study and bonus depreciation) can offset your W-2 income or active business income.
For a high-earning professional, the math is meaningful. A $1.4M cabin in Blue Ridge, run through a cost seg study, can produce $350,000 to $450,000 of first-year depreciation. At a 37% federal bracket, that’s $130,000 to $165,000 of federal tax savings in year one — before any state benefit.
But there’s a catch. To get non-passive treatment, you have to materially participate.
The Rule That Trips Up Almost Everyone: The 100-Hour Test
There are seven material participation tests in the regulations. For STR owners working with a property manager, one of them matters more than the rest:
You materially participate if (1) you spend more than 100 hours on the activity, AND (2) no other individual spends more hours on the activity than you do.
Re-read that second part. It says “no other individual” — and it doesn’t carve out employees or contractors. Your cleaner counts. Your handyman counts. Your hot-tub tech counts. Your property manager counts.
This is where most owners stumble. They imagine the test compares their hours to a single “manager” bucket. It doesn’t. It compares their hours to every individual touching the property — separately.
If your cleaner logs 140 hours scrubbing your Park City condo this year, you need to log more than 140 hours yourself to qualify under this test.
The good news: with the right structure, that’s very achievable.
One nuance worth flagging up front: hours don’t start counting only after the listing goes live. Hands-on owner-operator launch work — design, furnishing, supervising rehab, vendor coordination, getting the listing photographed and built — generally counts toward your participation hours when you’re personally doing the work. What doesn’t count is investor-style activity from a distance. The line is whether you’re operating or just observing. So the spring you spent painting, sanding floors, and getting your cabin launch-ready is part of the picture, not separate from it.
The False Choice (and Why You Don’t Have to Make It)
Here’s the trap a lot of owners fall into.
They hire a full-service manager who does everything — guest comms, dynamic pricing, cleaner coordination, maintenance dispatch, listing photos, monthly reports. The manager logs 300+ hours. The owner logs maybe 25. Game over.
Or they swing the other way. They self-manage from day one. They handle every guest message at 11 p.m. on a Tuesday, drive up to the property on weekends, meet the HVAC tech, keep the calendar themselves. By month four they’re burned out, ready to sell, or scrambling to hire help — at which point the hours math is already broken.
Neither extreme is the answer.
The middle path — what we call co-management — is deliberate. You stay meaningfully involved in the highest-leverage decisions. We handle the operational depth that drains your time. And critically, we structure our work so no single person on our team logs more hours than you do on yours.
What Co-Management Actually Looks Like
Here’s a real-world year for an owner running a Highline-managed cabin in Mammoth.
What the owner owns (and tracks):
- Approving design refreshes and capex decisions
- Reviewing and approving every owner statement
- Final say on pricing strategy and seasonal rate changes
- Quarterly listing photo and copy refreshes (input, not execution)
- Vendor selection and approval — cleaners, linen service, hot tub tech, snow removal
- Quarterly property visits: ski week in February, off-season walkthrough in May, fall reset in October
- Monthly review of guest reviews, NPS, and operational KPIs
- Marketing input — Instagram captions, neighborhood content, response to public reviews
- Tax and accounting coordination with the CPA
- Insurance review and annual renewals
Done seriously, that work lands most owners between 110 and 160 hours a year. The owner who treats this like a real business — because it is one — gets there comfortably.
What Highline owns (deliberately structured so no individual on our team exceeds the owner):
- 24/7 guest communication, split across multiple team members so no individual stacks excessive hours
- Dynamic pricing execution by our revenue team
- Cleaner and vendor scheduling, split across coordinators
- Listing copy and photo execution
- Operational reporting and owner dashboards
Cleaning is the most common hour-counting trap. We use teams of multiple cleaners on purpose, so no single cleaner stacks up hours that swamp the owner’s count.
Pairing This with Bonus Depreciation
Once your participation structure is in place, this is where the strategy gets fun.
Bonus depreciation lets you accelerate the depreciation on shorter-life property components — flooring, cabinetry, appliances, landscaping, certain electrical and plumbing — into year one. A cost segregation study identifies these components and assigns them to 5-, 7-, or 15-year asset classes.
Under current law, 100% bonus depreciation has been restored for property placed in service after January 19, 2025. That means you can deduct the full cost of those short-life components in the year you place the property in service.
For a typical $1.2M–$2M short-term rental, that commonly produces $250,000 to $500,000 of paper losses in year one.
If your STR clears non-passive treatment because you cleared the 100-hour test, those losses flow against your W-2 income, your business income, your spouse’s income — your full picture.
If you didn’t clear material participation, those losses become passive. They sit in suspended-loss limbo until you have other passive income to absorb them. The participation question is the difference between a tax strategy that works this year and one that works in theory.
Three Mistakes We See Every Year
First: no hour log. The owner thinks they put in plenty of time, but when audit season comes there’s no contemporaneous record. Memory doesn’t satisfy the IRS. Track your hours weekly in something time-stamped — a Google Sheet, a Toggl account, a calendar entry. We help every Highline owner set this up properly when they come on board.
Second: the “set it and forget it” manager. They hire a manager who runs everything autonomously, log a handful of hours of “review time,” and assume they qualify. They don’t. The cleaner alone usually beats them.
Third: hiring mid-year. An owner closes on a property in March, self-manages for two months and logs 80 hours, then hands it off in May to a manager who logs 250 hours over the rest of the year. That’s a failed test for the year. If you’re going to use a manager, structure it from day one — or at the very least, map it before placement-in-service.
How to Move Forward
If you’re considering buying a short-term rental in Mammoth, Park City, or Blue Ridge — or if you bought one this year and you’re trying to figure out how to keep your tax benefits without losing your weekends — there are three things worth doing right now.
One: Talk to your CPA about whether the STR loophole fits your full picture. Not every owner benefits, and a good CPA will tell you so.
Two: Model your hour budget honestly. Get specific about what you’ll personally do, when, and how often. If the answer is “less than 100 hours of real work,” self-management isn’t going to save you, and a co-management structure with hour discipline is the only path.
Three: Talk to a property manager who knows how this works. We’ve structured deals like this for owners across all three of our markets, and we’re happy to walk through your specific situation, your CPA’s questions, and what a Highline co-management arrangement would look like for your property.
Let’s Walk Through Your Specific Situation
The hours math is different for every owner — different markets, different vendors, different time available, different income picture. The right answer is rarely a generic one.
Book a 30-minute call with our team. We’ll cover your property, your tax goals, and exactly how we’d structure management to keep your participation intact. We’ll also walk you through how to track your time properly — that’s the single most important habit for any owner pursuing this strategy, and it’s one of the first things we set up with new owners.
No pitch, no pressure — just a real conversation.
→ Book your call with the Highline team
Up next in the series: Part 2 — The Math: how a $1.5M Mammoth property generates $400,000 of first-year paper losses, line by line. Then Part 3 — The Strategy and Part 4 — The Operations.
Important — please read. I’m not a CPA, an attorney, or a tax advisor. Nothing in this article is tax, legal, or financial advice — it’s education from the property-management side of the house. The §469 material participation rules, what qualifies as participation, and how cost segregation interacts with bonus depreciation are nuanced and fact-specific. Tax laws also change. Always sit down with a qualified CPA or tax attorney before acting on any of the strategies discussed here. If you’d like introductions to STR-experienced CPAs and cost segregation specialists we trust, just ask — we work with several and are happy to make the connection.