On July 4, 2025, Congress signed the One Big Beautiful Bill Act into law and permanently restored 100% bonus depreciation for qualifying property acquired after January 19, 2025. For Nashville STR investors, that single legislative fact changes the math significantly — but only for the ones who can actually use it. The strategy is not available to everyone who owns a short-term rental. It is available to investors who clear a specific sequence of eligibility hurdles in the correct order. Most people get the sequence wrong, or skip a step entirely, and then wonder why their CPA can't deliver the result they expected.
This post is a decision frame. Work through it in order. Each question either qualifies or disqualifies you for the next step. If you skip ahead, you're doing what most investors do — getting excited about the number before confirming whether you can legally claim it.
Step One: Does Your Property Actually Qualify as an STR Under the IRS?
Before any depreciation conversation happens, the property has to clear a classification threshold. The strategy is built directly into the U.S. tax code under IRC Section 469. The IRS recognizes that rental activities with average guest stays of seven days or less qualify as non-passive when the owner materially participates. That seven-day average is not a suggestion — it is the line. If your average guest stay runs eight or ten days, you are operating a standard passive rental, the non-passive treatment disappears, and cost segregation losses cannot offset your W-2 or business income.
In Nashville, this is rarely the problem. The dominant inventory — the bachelorette-party houses in East Nashville, the Gulch condos, the party-ready townhomes near Midtown — all run average stays of two to four nights. The median sale price of a home in Nashville was $475K over the last three months ending May 2026, up 0.5% since the same period last year , and most of the permit-eligible STR stock in Davidson County falls well within the seven-day threshold by default. This step is usually a pass. Confirm it with your booking data, document it, and move on.
Step Two: The Material Participation Test — This Is Where Most Investors Fail
This is the decision point. Everything downstream — the cost segregation study, the bonus depreciation, the six-figure year-one deduction — depends entirely on whether you clear this bar. And most investors, particularly the high-W-2 earners this strategy is most valuable to, either misunderstand what it requires or overestimate what their property manager is doing for them.
The IRS defines material participation as involvement on a regular, continuous, and substantial basis. Three common tests are: the 500-Hour Rule, where you participate more than 500 hours in the activity during the year; the Substantially-All Rule, where you do substantially all of the participation yourself; and the 100-Hour-Plus Rule, where you participate over 100 hours and more than any other individual.
The 100-hour-plus test is the one most Nashville STR investors can realistically clear — if they self-manage or stay closely involved in operations. Here is what that looks like in practice: qualifying activities include managing bookings, coordinating cleaning and maintenance, purchasing supplies and furniture, responding to inquiries, marketing, and financial record-keeping. What does not count is reviewing market reports, looking at listings, meeting with a broker, or building your own ROI spreadsheet.
Here is the critical trap: if you use a property manager, that does not automatically disqualify you — but if their individuals (repair people, cleaners, managers) spend more time on the property than you do individually, your hours may not satisfy the "more than anyone else" rule. A full-service STR management company that handles all guest communication, cleaning coordination, and maintenance calls will almost certainly log more hours than a passive owner. That flips the test. You fail it, and every deduction built on top of it fails with it.
The move most agents won't tell you about: If you are married and filing jointly, the IRS allows married couples filing jointly to combine both spouses' hours toward the total, which can make it significantly easier to meet the 500-hour threshold when managing one or more STR properties together. Two involved owners who split responsibilities — one handling bookings and guest communication, the other managing vendor relationships and supply runs — can hit 500 combined hours without either one doing 300 alone.
Step Three: Understand the Difference Between Material Participation and REPS
This confusion costs investors real money, because they assume they need Real Estate Professional Status and give up before they start. They are two different things. Material participation is required for both the STR loophole and real estate professional status, but they are separate strategies. With the STR loophole, you do not need REPS — you simply need to meet one of the material participation tests and have an average guest stay of seven days or fewer. REPS requires 750+ hours in real estate as your primary profession and is a separate and higher bar.
A physician pulling $450,000 in W-2 income who buys a permitted East Nashville STR and manages it actively does not need to become a real estate professional to use these losses. She needs to clear the material participation test for that specific property. That is a far lower threshold than REPS — and one that a disciplined, hands-on owner of a single property can meet. There is also a nuance worth knowing: short-term rental time does not count toward the 750 hours for real estate professional status because STRs are not considered rental activities or real estate activities for that purpose. The two strategies exist in separate compartments of the tax code.
Step Four: Understand What a Cost Segregation Study Actually Does
Assuming you've cleared steps one through three, here is what you are actually buying when you commission a cost segregation study. A cost segregation study is an engineering-based analysis that reclassifies components of a building into 5-, 7-, or 15-year asset classes instead of depreciating everything over 27.5 or 39 years. Typically 20 to 35 percent of the building cost qualifies — some property types reach 40 percent — and with 100% bonus depreciation made permanent under the One Big Beautiful Bill Act, that amount can be deducted in year one.
Nashville STR properties skew favorably in these studies because furnished short-term rentals contain significant furniture, fixtures, and equipment. Cost segregation for short-term rentals reclassifies 24 to 35 percent of a property's depreciable basis into accelerated asset classes. STR properties benefit disproportionately because furnished rentals contain significant furniture, fixtures, and equipment — beds, appliances, kitchenware, linens, electronics, and decor — that qualifies as 5-year personal property.
On a Nashville STR purchased at the current market median, the numbers look like this: a typical $500,000 to $750,000 Airbnb generates $20,000 to $80,000 in first-year accelerated depreciation deductions. Nashville properties in the $400K–$600K range hit the sweet spot: high enough basis for meaningful depreciation, low enough entry for strong cash-on-cash returns, and zero state tax friction. Tennessee has no state income tax, which means every dollar of federal cost segregation savings flows to the investor's bottom line without state-level addback complications.
What does a study cost? Most STR studies run $495–$1,295 based on property value, while traditional engineering firms charge $5,000–$15,000 for the same result. The difference is delivery model — automated studies versus full field engineering. Both produce IRS-compliant results under Rev. Proc. 87-56. For a single Nashville STR in the $500K–$700K range, the ROI on the study itself is not the debate.
Step Five: Know What Kills the Deduction at Tax Time
Clearing the material participation test qualitatively is not enough. The IRS places the burden of proof on you, and they audit this area aggressively. The IRS requires contemporaneous time tracking — records created during the tax year, not reconstructed afterward. Averages and estimates weaken your position during audit. Use actual time logs, calendar entries, and dated documentation throughout the year.
There are two specific documentation failures that kill Nashville STR deduction claims:
- Retroactive logs. Reconstructing your hours in March for a December audit is not contemporaneous documentation. Courts have rejected this repeatedly. Your log needs to exist in real time.
- Undercounting the property manager's hours. In Pohoski v. Commissioner, Tax Court Memo 1998-17, the Tax Court implied they would entertain proof that the taxpayer substantially participated compared to the participation of a third party, such as a property management company, but the test was not satisfied when taxpayers failed to put forth some indication of the actual time spent by third-party non-owners. If your property manager is logging 600 hours and you claim 150, your test fails under the 100-hour-plus rule regardless of the hours number.
The documentation standard is not difficult to meet. It is only difficult to meet if you start keeping records in February for a tax return due in April. Build the log into your operating routine from day one of ownership.
Step Six: Confirm the Tax Year Before You Order the Study
Timing matters more than most investors realize. A cost segregation study can be completed in any year after the property is placed in service, but the strategy is most effective when aligned with a year you materially participate. The losses created by accelerated depreciation are only usable in a year you have cleared the material participation test. Running a study in a year when you fail the test creates a deduction that either suspends until you can use it or gets trapped as a passive loss.
For properties acquired after January 19, 2025, the One Big Beautiful Bill Act permanently reinstated 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025. That means a property purchased and placed in service in 2026 gets the full first-year deduction — not the 40% rate that applied in 2025 under prior law before the effective date. The window is now, and it is permanent — but the material participation requirement does not change because the depreciation law did.
If you want to go deeper on how we evaluate Nashville STR investments before an offer is written, start with our Nashville short-term rental investment framework, which covers permit viability, revenue underwriting, and ownership structure alongside the tax positioning.
The Proprietary Trade-Off Most STR Advisors Skip
Here is what the tax-strategy content world does not say clearly enough: the same management structure that maximizes your material participation score minimizes your lifestyle flexibility. The investor who clears the 100-hour-plus test is also the investor who responds to guest messages at 11 PM, coordinates the cleaning crew between checkout and check-in, and restocks supplies after every booking cycle. That is not passive income. It is a part-time job with a tax benefit attached.
The trade-off is real and it should inform how you buy the property. If your life and job mean you cannot credibly log 100 documented hours of qualifying activity on a single property without a full-service manager, the STR loophole is not for you — at least not in its purest form. Some investors solve this by buying two or more Nashville STRs and combining activity; others use a partial-service manager that handles cleaning logistics but keeps guest communication and booking management with the owner. Neither solution is wrong. Both require you to decide upfront rather than discover the problem at tax time.
We walk through this trade-off in detail as part of the 2026 Costigan Group STR Playbook and the Nashville STR Underwriting Calculator, which we use before every investor offer in markets like East Nashville, The Gulch, and Germantown. If you're relocating to Nashville and evaluating STR investment as part of a financial strategy, our Nashville relocation advisors can help you evaluate the right neighborhoods and ownership structures before you close.
The Costigan Group's work across Nashville investment property — featured in USA Today as Nashville's leading STR and investment advisor — is built on exactly this kind of pre-purchase analysis. Not on selling you the narrative that a deduction exists, but on confirming whether you can actually use it before you commit $500,000 to a property.
For neighborhood-specific context on where Nashville's most active permitted STR inventory sits, and how location affects both revenue and permit availability, see our neighborhood guides for Greater Nashville.
Related reading
- Nashville Short-Term Rental Investment
- Nashville STR LLC Structure: The Operating Agreement Decisions to Make Before Closing
- Nashville STR Underwriting: The Occupancy Assumptions Smart Investors Use
Frequently Asked Questions
Does a Nashville STR owner need Real Estate Professional Status to use cost segregation losses?
When your average guest stay is seven days or fewer and you materially participate, the IRS treats your short-term rental as a trade or business, letting losses offset W-2, K-1, or investment income. You don't need real estate professional status. The STR loophole operates independently from REPS — you can qualify based solely on your STR activity and material participation. REPS is a higher, separate bar that requires more than 750 hours in real property trades or businesses as your primary occupation.
What activities actually count toward material participation in a Nashville STR?
Qualifying activities include managing bookings, coordinating cleaning and maintenance, purchasing supplies and furniture, responding to inquiries, marketing, and financial record-keeping. What does not count: reading market reports, browsing listings, meeting with a broker or lender, or building financial models. Active, operational involvement in the property counts. Passive oversight and research do not.
How much first-year depreciation can a $600,000 Nashville STR generate?
Cost segregation reclassifies 24 to 35 percent of a property's depreciable basis into accelerated asset classes, and with 100% bonus depreciation permanently restored under the One Big Beautiful Bill Act, a typical $500,000 to $750,000 Airbnb generates $20,000 to $80,000 in first-year accelerated depreciation deductions. The exact number depends on the property's component mix — a fully furnished Nashville townhome with outdoor amenities will typically score higher than a minimally appointed condo.
Can I use a property manager and still qualify for material participation?
Yes, but with a hard constraint. Using a property manager is not automatically disqualifying — but if their individuals (repair people, cleaners, managers) spend more time on the property than you do individually, your hours may not satisfy the "more than anyone else" rule. A full-service manager that handles all day-to-day operations will almost always log more hours than a passive owner, which breaks the 100-hour-plus test. A partial-service arrangement where the owner retains guest communication and booking management gives you a better shot at clearing it.
When is the right time in a year to order a cost segregation study on a Nashville STR?
Order it in the year you plan to use the deduction — and only after confirming you will clear material participation for that tax year. A cost segregation study can be completed in any year after the property is placed in service, but the strategy is most effective when aligned with a year you materially participate. Running the study in a year you fail the test results in suspended passive losses that may take years to deploy, eliminating much of the immediate tax benefit that makes the strategy worthwhile in the first place.
Does Tennessee's lack of a state income tax affect the value of a cost segregation study?
It actually makes it better. Tennessee's zero state income tax means every dollar of federal cost segregation savings goes directly to the investor's bottom line — no addback rules, no conformity issues, no state-level complications. In states that do not conform to federal bonus depreciation, investors often face a partial clawback on their state return. Tennessee investors keep the full federal benefit with no state offset.
What happens if the IRS audits my material participation claim?
The IRS places the burden of proof on taxpayers claiming material participation and business treatment for STRs. Keep detailed, contemporaneous logs of all time spent and activities performed. Save everything: emails, texts, receipts, booking records, and calendars. Poor documentation is the number-one reason STR tax benefits are disallowed. A log you build in real time throughout the year is defensible. A log you reconstruct from memory in February is not.
About The Costigan Group
Jack Costigan is the founder of The Costigan Group at Compass in Nashville, where his team has closed more than $100 million in real estate across Greater Nashville and Middle Tennessee. Specializing in luxury advisory, investment, and short-term rental real estate, Jack is known for a data-driven approach that helps buyers, sellers, and investors understand the numbers, the neighborhood, and the long-term value before making a decision. Featured in Apple News as one of Nashville's most sought-after short-term rental advisors, Jack pairs deep local expertise with modern marketing and a strategy-first approach to real estate. Learn more at thecostigangroup.com.
