STR Bonus Depreciation and Cost Segregation

Important disclaimer: This article is for educational purposes only and is not tax, legal, or financial advice. Tax rules are complex, change often, and depend on your personal facts. Every example below is illustrative. Before you buy a property or claim any deduction, consult a qualified CPA or tax advisor who can review your specific situation.

The Big Idea in One Paragraph

Most tax deductions require you to spend money and walk away with nothing. This one is different. When a short-term rental is set up and operated correctly, you can combine three tools (the short-term rental exception, a cost segregation study, and 100% bonus depreciation) to create a large first-year deduction that can offset W-2, bonus, or practice income. And the whole time, you still own a real asset that can produce rental income, pay down its own mortgage, and grow in value. You are not buying a deduction. You are buying real estate, and the deduction rides along with it.

Why Most Rental Losses Do Nothing for High Earners

To understand why this strategy is so valuable, you first need to understand the rule it works around.

Under Section 469 of the tax code, income falls into two main buckets: active (wages, a business you work in) and passive. Rental real estate is treated as passive by default, no matter how many hours you put in. A passive loss can generally only offset passive income. Against your salary, it does nothing in the year you incur it. The unused loss is suspended and carried forward until you have passive income or sell the property.

There is a small-landlord allowance of up to $25,000 for people who actively participate, but it phases out as income rises and is gone completely at $150,000 of modified adjusted gross income. For a physician, executive, attorney, or dual-income professional household, that allowance is usually off the table.

The traditional escape hatch is Real Estate Professional Status (REPS). It requires more than 750 hours a year in real property businesses and more than half of all your working hours. If you work 2,000 hours a year in a clinical or corporate role, you would need more than 2,000 hours of real estate work on top of that. For most busy professionals, that is simply not realistic.

So for most high earners, a normal long-term rental creates paper losses that sit parked, sometimes for a decade or more.

The Short-Term Rental Exception

There is a second door, and it does not require professional status.

Under Treasury Regulation §1.469-1T(e)(3)(ii)(A), an activity is not a "rental activity" if the average period of customer use is seven days or less. This is the same rule that governs hotels. Because the property falls outside the definition of a rental activity, the automatic passive label never attaches. Instead, it is treated like any other business, and the normal material participation tests apply.

There is also a second version: an average stay of 30 days or less combined with significant personal services, such as daily cleaning or concierge-type offerings. Most investors focus on the seven-day path because it does not require hotel-style services.

If you clear both tests below, your losses can be non-passive and may offset salary, bonus, and other ordinary income in the same year.

Test One: The Seven-Day Average

The average is calculated as total nights rented divided by the number of separate guest stays for the year.

It is an average, not a cap on any single booking. A few longer stays can be fine if the overall average stays at seven or below.

It is tested property by property, year by year. A property that averages six nights in one year and nine the next is treated differently in each year.

Personal use days are not rental days.

Example: Two properties each rent 180 nights. Property A has 40 separate stays, for an average of 4.5 nights. It qualifies. Property B has 18 stays, for an average of 10 nights. It fails. Same revenue, opposite tax result. Your booking policy is a tax decision, so set a maximum stay and stick to it.

Test Two: Material Participation

You must materially participate by meeting at least one of seven tests in Temporary Regulation. Three of them do almost all of the work for short-term rental owners.

Test What it requires Practical notes

Test 1 More than 500 hours in the activity during the year Demanding but clean; works even with a manager Test 2 Your participation is substantially all of the participation by anyone Best fit if you fully self-manage Test 3 More than 100 hours, and not less than any other individual The most common path**

Two details matter a lot:

Spousal hours combine for material participation purposes, which is different from REPS, where each spouse is tested separately.

"Any other individual" includes people you pay, such as cleaners, handymen, co-hosts, and property managers. Their hours are measured against yours.

The Property Manager Trap Test 3 is where many investors get caught. A full-service manager can easily log 200 to 400 hours on a single property. If you put in 120 hours and your manager puts in 310, you fail. If you put in 120 hours and your cleaner puts in 45, you pass.

If you want full-service management, plan for Test 1 (more than 500 hours) instead, or consider co-hosting and self-managed cleaning schedules that keep the comparison winnable. Make this decision before you sign a management agreement.

What Counts as Participation

Generally counts:

• Guest communication, booking management, and pricing decisions
• Cleaning, turnovers, maintenance, and repairs you do yourself
• Shopping for and installing furnishings, supplies, and equipment
• Marketing, listing photography, and managing reviews
• Meeting contractors on site and supervising their work
• Generally does not count:
• Reviewing financial statements as an investor
• Researching markets or future purchases
• Work done by an employee, manager, or contractor on your behalf
• Travel time to and from the property, which the IRS routinely challenges
• Time spent simply "on call" or available

Cost Segregation: Where the Big Deduction Comes From

Qualifying under the short-term rental exception opens the door. A cost segregation study is what makes the loss large enough to matter.

Normally, the building portion of a property is depreciated slowly over decades. A cost segregation study is an engineering-based analysis that breaks the property into its component parts and reclassifies many of them into shorter recovery periods:

5-year and 7-year property: appliances, carpet and certain flooring, cabinetry, specialty electrical, window treatments, furniture and fixtures

15-year land improvements: driveways, fencing, landscaping, patios, exterior lighting, pools in many cases

The building shell: stays on its long schedule

How much gets reclassified? Typical residential studies move roughly 20% to 30% of depreciable basis into shorter lives.

White Coat Investor Furnished short-term rentals often land higher because of the furniture, appliances, and finishes they require; one 2026 benchmark dataset shows a median of about 29.8% for short-term rentals versus 18.3% for unfurnished single-family rentals (

Cost Seg Smart Every property is different, and the study, not a rule of thumb, drives the real number.

Study costs commonly range from about $5,000 to $15,000 for small and mid-size properties. Insist on an engineering-based study, because that is what holds up under review.

A Quick Note on 27.5 vs. 39 Years Many investors assume a short-term rental is depreciated over 27.5 years like a normal residential rental. However, a building only qualifies as "residential rental property" if most of its income comes from dwelling units, and units used on a transient basis (generally stays under 30 days) may not count. As a result, many CPAs depreciate short-term rental buildings over 39 years as nonresidential property

The good news: this barely changes the year-one result. The large deduction comes from the reclassified 5-, 7-, and 15-year property and bonus depreciation, not from the building shell. In our first scenario below, switching the shell from 27.5 to 39 years lowers the year-one deduction by only about $1,100. Ask your CPA which schedule fits your property.

100% Bonus Depreciation Is Back, and It Is Permanent This is the piece that turned a good strategy into a great one.

Under the 2017 tax law, bonus depreciation was phasing down: 80% in 2023, 60% in 2024, 40% in 2025, 20% in 2026, and zero after that. The One Big Beautiful Bill Act, signed July 4, 2025, permanently restored 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025.

What that means for you:

Qualifying property includes assets with a recovery period of 20 years or less, which is exactly what a cost segregation study produces.

Used property qualifies if you meet the acquisition rules, so you do not need to buy new construction.

The acquisition date matters. If you signed a binding purchase contract on or before January 19, 2025, the old phase-down still applies (20% for property placed in service in 2026).

Bonus is automatic unless you elect out, and the election to opt out is made class by class.

Does not qualify: land and the building shell.

Put simply: cost segregation identifies the parts of the property that can be written off fast, and 100% bonus depreciation lets you write them off in year one.

Why This Is So Powerful: You Get Paid Four Ways

Here is what makes this strategy different from almost every other tax deduction. Most write-offs require you to spend a dollar to save 37 cents. With a short-term rental, you are buying an asset that can keep working for you long after the deduction is taken.

The Tax Savings

The first-year deduction can reduce your tax bill by tens of thousands of dollars, or more, in the year you buy. That is real cash that stays in your pocket and can go toward reserves, your next property, or other goals.

Cash Flow

A well-chosen short-term rental can generate meaningful rental income. Industry data is supportive right now: AirDNA's 2026 Midyear Outlook forecasts U.S. short-term rental occupancy averaging 57.4% in 2026, above the pre-pandemic average of 57.0%, with revenue per available rental forecast to rise 2.9% as slower new supply supports pricing. Performance varies widely by market, so underwrite each property on its own numbers.

Appreciation

Real estate has a long track record of rising in value over time. According to the FHFA House Price Index, U.S. home prices have posted positive annual appreciation every quarter since the start of 2012, and rose 2.1% year over year as of the second quarter of 2026. Past performance does not guarantee future results, and local markets can rise or fall.

Loan Paydown

Every mortgage payment reduces your loan balance. When guests are covering that payment, your renters are effectively building your equity for you.

Putting It Together: A Five-Year Illustration

Using Scenario 1 and these simple assumptions: a $480,000 loan at 6.5% over 30 years, 3% annual appreciation, and a modest $6,000 per year of net cash flow after all expenses. These are hypothetical assumptions, not projections.

Source of value (5 years) Illustrative amount Year-one federal tax savings $58,668 Appreciation at 3% per year on $600,000 About $95,600 Loan principal paid down About $30,700 Net cash flow ($6,000 x 5) $30,000 Total illustrative value created About $215,000 Cash invested $203,000

In this example, the combined value created over five years exceeds the original cash invested, and you still own the property. Note that the tax savings are largely a deferral (explained below), and actual results depend on the property, market, financing, and management.

The key mindset: the deduction should improve a purchase you already want to make. It should never justify a purchase you would not make otherwise.

Deferral, Not Elimination: Understanding Recapture

Accelerated depreciation lowers your basis in the property, which increases your taxable gain when you sell. Plan the exit at the same time you plan the purchase.

Personal property from the cost segregation study (5- and 7-year items) is generally recaptured under Section 1245 at ordinary income rates.

Real property depreciation is generally taxed as unrecaptured Section 1250 gain at up to 25%.

Remaining appreciation is generally taxed at long-term capital gains rates of up to 20%, plus the 3.8% net investment income tax where it applies.

So why is it still worth it? Several reasons:

Time value of money. A dollar of tax saved today, invested for years, is worth more than a dollar of tax paid later.

Rate arbitrage. Part of the deduction is taken at your top rate today (as high as 37%) while some of the recapture may be taxed at lower rates later, especially if you sell in a lower-income year, such as retirement.

1031 exchange. You may be able to defer the gain by exchanging into another investment property.

Step-up in basis. If you hold the property until death, your heirs generally receive a stepped-up basis, which can eliminate the deferred gain entirely.

The Guardrails Four limits can shrink or eliminate the deduction if you plan around them too late.

Personal use (Section 280A). Keep personal use below the greater of 14 days or 10% of days rented at fair market value. Cross that line and deductions can be limited to rental income.

At-risk and basis limits. You generally cannot deduct more than your amount at risk. Cash and a standard mortgage typically count; some seller-financing and related-party arrangements may not.

The excess business loss cap (Section 461(l)). For 2026, net business losses above $256,000 for single filers or $512,000 for joint filers cannot offset nonbusiness income like wages this year. The excess carries forward as a net operating loss. The 2026 threshold is actually lower than 2025's ($313,000 and $626,000) because the 2025 tax law reset the inflation base.

Placed in service by December 31. To claim the deduction for a given tax year, the property must be complete, furnished, listed, and genuinely available for rent before year end. Closing in December with a February listing moves the deduction to the next year.

Also check:

Local rules. Zoning, HOA covenants, and city short-term rental ordinances can block the strategy before tax law ever applies.

State taxes. Many states do not follow federal bonus depreciation, including California and several others that require add-backs

Florida residents have no state personal income tax, which keeps things simpler at the individual level.

Self-employment tax. If you provide substantial guest services, rental income may become subject to self-employment tax

Audit Readiness: Records Win Cases The IRS knows this strategy and examines it. Recent court cases show that the property qualifying is not enough; you must also prove your hours.Build your records as the year happens, not in April.

• Document Why it matters When to create it
• Hour log with dates, tasks, and times Proves material participation; the most contested item Daily, from day one
• Booking and stay records Proves the seven-day average Export quarterly
• Cost segregation study Supports every reclassified dollar Shortly after closing
• Placed-in-service evidence Listing screenshots, calendar, first booking Before December 31
• Management and vendor agreements Shows who else worked on the property, and how much At signing
• Personal-use calendar Keeps you within the 280A limits Continuously
• Invoices and receipts Supports furnishings, improvements, and expenses As incurred
• A Step-by-Step Roadmap

Model the numbers. Run your actual income against the potential deduction with your CPA. Confirm you are in a bracket where the deduction is valuable, typically 32% or higher.

Choose the market. Verify short-term rentals are legal and permitted. Underwrite the property on its own economics first, not the tax result.

Close and order the study. Complete the purchase and order a cost segregation study right away so the allocation is ready at filing.

Place it in service. Furnish, photograph, list, and open the calendar. The property must be genuinely available for rent by December 31 to count for that tax year.

Log and file. Track hours from the very first task. Your CPA reports depreciation on Form 4562. If you own a property you never studied, ask about a "look-back" study filed with Form 3115 to catch up on missed depreciation.

If you are reading this late in 2026: the December 31 placed-in-service deadline leaves little room. A property that closes but is not listed and available before year end will push the deduction into 2027. Since 100% bonus depreciation is now permanent, a well-planned 2027 purchase can still capture the full benefit.

Is This Right for You? This strategy is powerful but narrow. It tends to fit when:

• Your household income is high enough that the deduction lands in the 32% bracket or above
• You have the cash for a meaningful down payment without disrupting other goals
• You genuinely want to own the property, and the tax result is a bonus, not the reason
• You or your spouse can commit real, loggable hours to running it
• You plan to hold for several years, or to exchange rather than sell outright

If you checked most of these boxes, it may be worth a deeper conversation with a CPA and a real estate professional who specializes in short-term rentals.

The Bottom Line

The short-term rental strategy works because it stacks benefits that rarely come together: a large, legitimate first-year deduction that can offset active income, plus ownership of a real asset that can generate cash flow, build equity through loan paydown, and appreciate over time. With 100% bonus depreciation now permanent, the opportunity is no longer on a countdown clock, but the rules around participation, documentation, and timing are as strict as ever.

Buy a great property first. Run it like a business. Document everything. And let the tax savings be the bonus on top of a sound investment.

Disclaimer: This article is provided for educational and informational purposes only and does not constitute tax, legal, accounting, or investment advice. Tax laws are complex and subject to change, and their application depends on individual facts and circumstances. All figures and scenarios are hypothetical illustrations, not predictions or guarantees of results. Real estate investments involve risk, including loss of principal. Always consult a qualified CPA, tax attorney, or financial advisor before making any investment or tax decision.

Important disclaimer: This article is for educational purposes only and is not tax, legal, or financial advice. Tax rules are complex, change often, and depend on your personal facts. Every example below is illustrative. Before you buy a property or claim any deduction, consult a qualified CPA or tax advisor who can review your specific situation.