The STR Tax Loophole in 2026: Bonus Depreciation Was Heading to 20% — Here Is What Changed and What to Do Now

The Loophole That Almost Disappeared

Picture this: It’s late 2024. You’re sitting across from your CPA, coffee in hand, and she delivers the kind of news that makes real estate investors audibly groan. Under the Tax Cuts and Jobs Act (TCJA), bonus depreciation — that glorious first-year write-off that made short-term rental investing so tax-efficient — was phasing out on schedule. The math was grim: 40% in 2025, 20% in 2026, and a flat zero by 2027. The window, as accountants like to say, was closing.

Then Congress intervened.

The One Big Beautiful Bill Act (OBBBA, signed into law in July 2025) permanently restored 100% bonus depreciation for qualified property acquired after January 19, 2025. The IRS confirmed the mechanics in Notice 2026-11, issued January 14, 2026. The loophole, in other words, did not disappear. It was rescued, dusted off, and handed back to investors with a bow on it.

If you have been waiting on the sidelines — or if you bought an STR in the last twelve months and haven’t yet had a conversation with a qualified CPA about cost segregation — this article is your orientation session. I’ve reviewed more tax codes than most people have unread emails, and I will be direct: the combination of the STR loophole, cost segregation, and 100% bonus depreciation is one of the most powerful tax strategies available to working professionals who invest in real estate. Used correctly, it is also entirely legal.

Used incorrectly, it is the kind of thing that gets you a very polite but unmistakably serious letter from the Internal Revenue Service. So let us be precise.

Two Laws Working Together: The STR Loophole and Bonus Depreciation

The “STR loophole” is not actually a loophole in the pejorative sense. It is a specific application of the Internal Revenue Code’s passive activity rules — a framework Congress deliberately designed to distinguish passive investors from active business participants.

Under IRC Section 469, rental activities are classified as passive by default. Losses from passive activities can only offset other passive income. If your rental generates a $40,000 paper loss in Year 1 and you have no passive income to absorb it, that loss sits in a carryforward bucket, doing nothing useful for your $200,000 W-2 salary.

But there is an exception baked into the code, and it hinges on two criteria:

• Average stay of 7 days or fewer. If the average guest rental period across your entire tax year is seven days or less, the IRS does not classify the activity as a “rental activity” under Section 469. It becomes a business activity.
• Material participation. You must materially participate in the management and operation of that business. The IRS provides seven tests; satisfying any one qualifies you. The most commonly used: you log 500 or more hours per year in the activity, or you work more than 100 hours and no one else puts in more time than you do.

Meet both criteria, and your STR losses are reclassified as non-passive. Non-passive losses are not confined to a carryforward bucket. They offset W-2 wages, business income, capital gains — essentially whatever ordinary income you have on the return. For a host in the 32% or 37% federal bracket, that is a meaningful distinction.

Now add 100% bonus depreciation to this equation and the numbers become genuinely interesting.

How Bonus Depreciation Works (And What the OBBBA Changed)

Under standard depreciation rules, a residential rental property is depreciated over 27.5 years. Buy a $300,000 property, allocate some portion to non-depreciable land (say $60,000), and you are left with $240,000 in depreciable basis spread across 27.5 years. That is roughly $8,700 per year — useful, but not transformative.

Bonus depreciation, established under the TCJA and now permanently restored by the OBBBA, allows certain short-lived property components to be deducted entirely in Year 1 rather than over their standard schedules. The TCJA initially provided 100% through 2022, then the phase-down began: 80% in 2023, 60% in 2024, 40% in 2025, and 20% in 2026 under the original schedule — before zeroing out entirely in 2027.

The OBBBA reset the clock. For property acquired after January 19, 2025, the rate is back to 100% — permanently, under current law. RSM confirms the OBBBA permanently reinstated 100% bonus depreciation for most qualified property with a class life of 20 years or less.

One important caveat: property acquired on or before January 19, 2025, and placed in service after that date is still subject to the old phase-down schedule — meaning 20% for assets placed in service in 2026. If you closed on a property in late 2024 and are placing it in service this year, your bonus depreciation rate for those assets is 20%, not 100%. The acquisition date, not the placed-in-service date, is what controls eligibility for the new rules.

As always, confirm your specific situation with a CPA before making any assumptions about which rules apply to your property.

Enter Cost Segregation: The Engine Behind the Numbers

Here is where accountants start drawing diagrams on napkins and tax attorneys lean forward in their chairs.

A cost segregation study is an engineering-based tax analysis that breaks down a property into its individual components and assigns each component to its proper depreciation class. The goal is to reclassify as many assets as possible from the standard 27.5-year schedule to the faster 5-year, 7-year, or 15-year schedules — and then apply bonus depreciation to those accelerated components for an immediate write-off.

What gets reclassified? More than you might expect. A qualified cost segregation engineer might identify:

• 5-year property: Appliances, flooring, carpeting, window treatments, countertops, cabinetry, and certain specialty electrical outlets
• 7-year property: Furniture, fixtures, equipment
• 15-year property: Landscaping, paving, fencing, outdoor lighting, and other site improvements

The structural shell of the building — foundation, framing, roof, HVAC system — typically remains on the 27.5-year schedule. But in a furnished, fully-equipped short-term rental, a substantial portion of your basis may qualify for accelerated treatment.

On a $300,000 STR property, a cost segregation study commonly identifies between 25% and 40% of the depreciable basis as 5-year or 15-year property. That translates to roughly $50,000 to $100,000 in components eligible for immediate write-off under 100% bonus depreciation. Add furniture, outdoor amenities, and any renovation work, and first-year deductions of $75,000 to $150,000 or more are achievable on a single property.

Cost segregation studies typically run $3,000 to $10,000 for residential properties. The math almost always favors conducting one on any STR with a purchase price above $200,000, and it becomes a straightforward decision above $300,000.

A Real Example: The Numbers on a $350,000 Purchase

Let’s walk through a scenario. A nurse practitioner in Tennessee earns $180,000 per year in W-2 income. She purchases a cabin STR in the Smokies for $350,000 in March 2026 — well after the January 19, 2025 cutoff, so the 100% bonus depreciation rate applies. She has an engineer conduct a cost segregation study.

The study identifies the following:

• Land value: $50,000 (not depreciable)
• 5-year property (appliances, flooring, fixtures, cabinetry): $65,000
• 15-year property (deck, landscaping, outdoor fire pit, paving): $25,000
• 27.5-year property (structure): $210,000

With 100% bonus depreciation applied to the 5-year and 15-year components, she claims $90,000 in Year 1 deductions from those components alone. The 27.5-year structural portion generates another $7,636 in standard depreciation. Total first-year depreciation deduction: approximately $97,636.

Now, the STR loophole. She lists the property on Airbnb and VRBO with a minimum stay policy that keeps her average rental period at 4.5 days. She manages bookings, coordinates cleaners, handles guest communications, and logs her hours carefully — ultimately reaching 520 hours of documented participation for the year.

That meets both prongs of the test: average stay under 7 days, material participation over 500 hours. Her $97,636 in losses is non-passive. Applied against her $180,000 W-2 income, her taxable income drops to approximately $82,364. At a marginal federal rate of 32%, she saves roughly $31,000 in federal income taxes in Year 1 alone.

The property still exists. It still generates rental revenue. It is still building equity. She simply also gets a substantial tax benefit for running it as a real business — which she is.

What Could Go Wrong (Because Something Always Can)

I would be derelict in my duties as a legal advisor if I stopped at the good news. The STR loophole is real, legal, and well-established — but it has sharp edges.

The 7-day test requires documentation. The IRS calculates the average rental period based on actual rental days during the year. If a few long-term guests push your average above 7 days, the non-passive classification disappears for that year. Track every booking. Calculate your average rental period before filing.

Material participation requires contemporaneous records. “I think I worked about 500 hours” does not satisfy the IRS. You need a log — dates, activities, time spent. Your property management software, calendar, and task history can all support this. If you use a full-service property manager and have minimal personal involvement, the 500-hour test is going to be very difficult to meet.

Personal use can limit deductions. If you or family members use the property for more than 14 days per year, or more than 10% of the days it was rented at fair market value, the vacation home rules apply and some deductions will be limited proportionally.

Depreciation recapture is the other shoe. When you sell the property, the IRS recaptures previously claimed depreciation at a rate of up to 25% (unrecaptured Section 1250 gain). The deductions taken in Year 1 are real — but they are in part a deferral of tax liability, not a permanent elimination. A 1031 exchange can defer recapture; selling outright will trigger it.

As I said: sharp edges. This is a strategy that rewards careful operators and punishes sloppy ones. STR regulations are tightening across the board in 2026, and tax compliance is no exception. A well-documented file is your first line of defense.

The Bigger Picture: Why 2026 Is Still a Good Year to Act

I want to address the underlying question I suspect you have after reading all of the above: if 100% bonus depreciation is now permanent, why does urgency matter?

A few reasons.

First, permanent under current law is a phrase that should always be read alongside the understanding that Congress can change current law. The TCJA originally made 100% bonus depreciation permanent too — until the phase-down schedule was written into the same bill. Tax policy responds to budget pressures, political cycles, and revenue needs.

Second, the STR market in 2026 is showing real differentiation between professional operators and casual hosts. Supply growth has decelerated to 4.6% annually (down from over 20% in 2021-2022), and operators who manage their properties as businesses — with proper accounting, documented participation, and strategic tax planning — are separating from the pack. The tax efficiency of 100% bonus depreciation is one component of that professional advantage.

Third, the factors that make the STR loophole work — 100% bonus depreciation, cost segregation, and the non-passive classification for short average stays — all have to line up simultaneously. A property acquired in 2026 captures all three at once. A property acquired under a future reduced-rate environment captures the loophole at a fraction of the first-year benefit.

The window is open. It may stay open for a while. But it has a documented history of closing quickly.

If you are also factoring in how platform fee increases are affecting your net revenue, or want to understand how property management costs affect your bottom line, both factors should be modeled alongside your depreciation strategy before you commit to a purchase.

Your Pre-Purchase Tax Checklist

Before pulling the trigger on an STR acquisition, run through this checklist with your CPA:

1. Confirm acquisition date. Must be after January 19, 2025 to qualify for 100% bonus depreciation under the OBBBA. If earlier, calculate your applicable rate.
2. Verify average stay projections. Model your expected booking calendar. If the market or your minimum-stay policy would push your average above 7 days, the STR loophole does not apply.
3. Assess your material participation capacity. Can you realistically log 100 to 500+ hours? If you plan to use a full-service manager with no personal involvement, revisit which material participation test is achievable.
4. Commission a cost segregation study. For any STR above $200,000, the cost-benefit analysis almost always favors conducting one before filing your first return.
5. Model the recapture liability. Know what happens at sale. Run the depreciation recapture numbers before you assume the deductions are a pure win.
6. Maintain contemporaneous records from Day 1. Log hours, document rental periods, keep every booking record. The time to start the documentation habit is before the IRS asks for it, not after.

This article provides general information and should not be construed as legal advice. Consult a qualified attorney or CPA in your jurisdiction for advice specific to your situation.

We do our best to keep our regulatory and tax guides accurate and up to date, but tax law changes and we are only human. Always verify current requirements directly with a qualified tax professional before making investment or filing decisions.

Run Your STR Numbers

Tax strategy is only half the equation. Before you commit to a purchase, you need to know whether the underlying property can generate the revenue to make the numbers work. Our free STR Analyzer pulls real market data so you can estimate occupancy rates, average daily rates, and projected annual revenue for properties in your target market — before you write a check.

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