When you buy an existing short-term rental in an arm's-length sale from an unrelated seller, your buying an existing airbnb tax position is a full reset. IRC §168(k)(2)(A)(ii), as amended by the Tax Cuts and Jobs Act (TCJA) in 2017, made used property eligible for 100% bonus depreciation as long as the taxpayer had not previously owned or used it, and the sale was not between related parties per IRC §179(d)(2). IRC §1012 sets your cost basis at what you paid — the seller's remaining basis does not carry over. The One Big Beautiful Bill Act (OBBBA), signed July 2025, preserved 100% bonus permanently for property placed in service after January 19, 2025. The seller's cost segregation study, depreciation schedule, and prior deductions are their tax problem, not yours. You get a fresh buyer-side cost seg analysis on your allocated purchase price and start over at 100%.
Walk into any BiggerPockets forum thread on cost segregation and count the number of times someone confidently posts "you can't cost seg a used property" or "the seller's depreciation carries over to the buyer." Both statements are wrong. Both are repeated constantly. Both have been wrong for nine years.
The confusion is expensive. An STR investor who believes they cannot bonus depreciate a used property leaves six figures of Year 1 deduction on the table — or, worse, walks away from an operating property that would have been a Diamond-tier deal on a fresh cost seg. This article corrects the record with statute cites you can hand to your CPA.
The most common STR tax myth: "you can't cost seg a used property"
This myth predates the Tax Cuts and Jobs Act and never got updated in the community's collective memory. Before December 2017, IRC §168(k) had an "original use" requirement — bonus depreciation applied only to property whose first use commenced with the taxpayer. In plain English: new construction only. If you bought a used building, no bonus.
TCJA rewrote IRC §168(k)(2)(A)(ii) to remove the original-use requirement for property acquired after September 27, 2017 and placed in service after that date. The statute now reads (paraphrased): qualifying property includes property "acquired by the taxpayer" so long as (i) the taxpayer had not previously used the property, and (ii) the property was not acquired from a related party under IRC §179(d)(2). That's it. The universe of bonus-eligible property expanded from new construction only to essentially all real and personal property acquired in an arm's-length transaction from an unrelated seller.
The 100% bonus rate itself has bounced: 100% under TCJA (2017–2022), then phased down to 80% / 60% / 40% under the original TCJA sunset schedule. The One Big Beautiful Bill Act, signed in July 2025, restored 100% bonus permanently for qualified property placed in service after January 19, 2025. But the used-property eligibility under §168(k)(2)(A)(ii) has been continuously in effect since TCJA — the rate changed, the eligibility rule did not.
The related-party exclusion is real and matters. IRC §168(k)(2)(E)(ii) blocks bonus depreciation when the buyer and seller are related under IRC §179(d)(2), which cross-references §267(b) and §707(b). Buying an STR from a parent, sibling, controlled entity, partnership you're a partner in, or trust you're a beneficiary of can disqualify the used property from bonus. Arm's-length sales from unrelated third parties — the standard STR acquisition scenario — are fully eligible. If you're structuring a sale within a family or between related entities, get a tax attorney involved before signing.
The stepped-up basis rule: your Year 1 depreciation is calculated on YOUR purchase price
The second half of the myth — that the seller's depreciation "carries over" to the buyer — is easier to debunk. It doesn't. Under IRC §1012, the basis of property is its cost. When you close on an operating STR, your cost basis is the purchase price you paid, plus certain closing costs, less allocated land value. The seller's remaining basis, their accumulated depreciation, their §1245 recapture exposure — all of that stays on the seller's side of the transaction. Your depreciation clock starts fresh at your basis.
This is what makes buying operating short-term rentals so tax-efficient. Consider two structurally identical properties in the same market:
- Property A: Brand new construction, $850,000 purchase price. You take 100% bonus depreciation on the 5-year and 15-year components of your allocated basis.
- Property B: Five-year-old cabin sold by an investor who already claimed 100% bonus back in 2021. You buy it for $850,000. You take 100% bonus depreciation on the 5-year and 15-year components of your allocated basis.
The Year 1 deduction is identical. The seller's prior treatment is irrelevant to your calculation. In fact, Property B is arguably the better deal — the seller may have absorbed part of the cost of installing the pool, the hot tub, and the finish package. You inherit the amenity stack (which drives your bonus-eligible percentage) at market price rather than developer margins.
What actually transfers vs. what resets when you buy an operating STR
The rules of the road on a resale-STR transaction are cleaner than the forum debates suggest. Here's the side-by-side, item by item:
| Item | Transfers to buyer? | What actually happens |
|---|---|---|
| Seller's depreciation schedule | No | Terminates at closing. Seller reports final-year depreciation on their return. Your schedule starts fresh under IRC §1012. |
| Seller's cost segregation study | No | Tied to the seller's basis and finishes-as-of-purchase. Historical document. Do not rely on it for your allocation. |
| Seller's §1245 recapture liability | No | Entirely the seller's tax bill, reported on their return in the year of sale. Zero buyer exposure. |
| Existing FF&E, appliances, hot tub, pool | Yes (if conveyed) | Physically transfer with the property, valued as part of the purchase price allocation. Eligible for 5-year or 15-year buyer-side classification. |
| Occupancy / booking history | No | Your material participation and 7-day-average tests run from your ownership start date, not the seller's history. |
| Gross rental income for STR loophole test | No | The average-guest-stay test under Treasury Regulation §1.469-1T(e)(3)(ii)(A) is measured across YOUR bookings during YOUR ownership period. |
| Buyer's fresh bonus depreciation eligibility | Yes | Full 100% bonus on 5-year personal property and 15-year land improvements per IRC §168(k)(2)(A)(ii), calculated on your basis. |
| Existing STR permits / short-term rental license | Sometimes | Depends on jurisdiction. Some cities (Nashville, Scottsdale) allow transfer; others (Sedona, Palm Springs) require reapplication. Verify before closing. |
The clean rule: physical stuff transfers, tax attributes don't. If the pool is bolted to the ground when you close, it's yours to depreciate. If the seller's cost seg said the pool was worth $47,000 in 2021, that number is irrelevant to your calculation — your pool is worth whatever your allocated basis says it's worth today.
The "already-cost-segged" trap — why the seller's engineering study is worthless to you
A well-intentioned seller sometimes offers to hand over their cost segregation study during due diligence, framed as a value-add. Sellers who invested $8,000–$15,000 in a formal study understandably want to salvage some benefit from it. Buyers, especially first-time buyers, sometimes assume this saves them from having to run their own analysis.
It doesn't. The seller's study is calculated on the seller's basis (usually much lower than your current purchase price), using engineering assumptions tied to the seller's acquisition date. Anything the seller replaced, upgraded, or added after their study is embedded in the physical property today but not itemized in the study. And your Year 1 bonus is a function of YOUR basis in the 5-year and 15-year components — a calculation the seller's study literally cannot perform.
Two practical scenarios where relying on the seller's study creates real dollar loss:
- Basis inflation from appreciation. Seller bought for $520k in 2021, did cost seg on $520k basis, allocated $95k to bonus-eligible categories (18.3%). You buy for $850k in 2026. If you naively apply the seller's 18.3% to your $850k, you get $156k. A fresh buyer-side analysis on today's finishes and today's basis is likely to land higher — the appreciation has expanded the depreciable pool proportionally.
- Post-study amenity additions. Seller added an outdoor kitchen and a second hot tub in 2023 (after the 2021 study). Those items are not in the seller's line-item schedule. A buyer relying on the seller's study misses those two 15-year items — potentially $25k–$40k of bonus-eligible cost not captured.
For a full comparison of the three buyer-side options — formal engineered cost seg, DIY estimation, and a photo-based $99 report — see our writeup on cost segregation studies vs. the DepreciMax report. The short version: for a specific listing you're evaluating pre-offer, a $99 photo-based report tuned on the current listing photos will beat inheriting the seller's stale study every time.
Worked example: buying an $850k operating Smoky Mountain cabin
Concrete numbers make the mechanics obvious. A $850,000 operating cabin in the Gatlinburg / Pigeon Forge area we recently modeled — three bedrooms, hot tub on the back deck, indoor pool, mountain-view fire pit, fully furnished, active on Airbnb for four years under prior ownership.
Now the counterfactual: the seller had bought the same cabin in 2021 for $540,000. They ran a formal cost seg study back then and claimed roughly $124,000 in bonus-eligible depreciation in 2021 dollars. At the 2026 sale, their remaining structural basis is around $460,000 — that's their number. Their gain-on-sale calculation triggers ordinary-income recapture on the previously depreciated 5-year and 15-year components, plus §1250 unrecaptured gain on the structure — all detailed in our depreciation recapture explainer.
None of that touches the buyer's return. The buyer's calculation runs on $850,000, allocates land per current assessor data, classifies today's finishes on today's basis, and lands at $202,000 in Year 1 federal deduction — 23.8% bonus-eligible on the purchase price, Diamond-tier by DepreciMax medal thresholds. The seller had their bite of the apple in 2021. The buyer gets a fresh bite in 2026 at the current basis.
This is the "reset" in action. Same physical property. Two different taxpayers, two different bases, two independent Year 1 deductions across the property's ownership history. Nothing about the seller's 2021 cost seg or 2021 bonus depreciation reduces the buyer's 2026 eligibility. The rules are cumulative across owners, not shared.
How the STR loophole material-participation test applies in Year 1 when you take over mid-year
The buyer-side reset works cleanly for the depreciation math. The material participation test under IRC §469, however, is calendar-year-based and does not care about the seller's prior activity. A buyer who closes mid-year has a compressed window to satisfy the 7-day rule and the participation hours.
Two independent tests both have to be met in the buyer's ownership year:
7-day average guest stay — measured on YOUR bookings
Treasury Regulation §1.469-1T(e)(3)(ii)(A) requires the average period of customer use to be 7 days or fewer. That average is calculated across bookings made during your ownership period, not the seller's booking history. Nightly-rental platforms (Airbnb, VRBO) typically produce averages of 3–5 nights — well inside the rule — but if you rehab the property post-closing and take it off the market for 45 days, verify the bookings you do take in the remaining calendar year still average ≤ 7 days.
Material participation — hours must clear a §1.469-5T threshold in YOUR ownership window
The two workhorse tests for STR owners are 500+ hours (the high bar) and 100+ hours combined with being the participant who logs more hours than anyone else on the activity (the practical bar for most self-managing owners). Both tests are calendar-year cumulative and do not benefit from any seller activity. A June 1 closing gives you 7 months to accumulate hours; an October 15 closing gives you 10 weeks. October-close buyers should model participation risk carefully — for the full framework see the IRC §469 CPA blind spot.
Placed-in-service date sets the depreciation clock
Bonus depreciation runs from the date the property is available for its intended STR use under your ownership — typically the closing date, or the first date you list the property for booking if you did a brief post-closing setup. Document this date with the first listing screenshot or the first booking confirmation. The Year 1 bonus is 100% of the eligible components regardless of month placed in service — no proration on bonus itself — but the calendar-year participation tests still apply.
Model your buyer-side Year 1 deduction on the actual listing photos
The property already exists. The pool, hot tub, kitchen finishes, and outdoor amenities are on the Airbnb listing right now. DepreciMax turns 7–25 listing photos into a line-item 5-yr / 15-yr / 39-yr allocation on your projected purchase price — closely calibrated to a formal engineered cost seg — for $99 per report. This is exactly the pre-offer buyer-side analysis that used-property buyers need.
Run a $99 Buyer-Side Report →Pre-offer checklist: what to request from the seller, what to model in your DepreciMax report
Buying an operating STR — pre-offer tax checklist
- Confirm arm's-length, unrelated-party status. The seller cannot be a family member, controlled entity, partnership you're in, or trust you benefit from under IRC §179(d)(2). Related-party sales disqualify used-property bonus.
- Get the current listing photos. All 30–50 marketing photos, all angles, all amenities. These are the raw input to a buyer-side cost seg — do NOT rely on staged photos from years ago.
- Verify what's conveyed as FF&E. Furniture, appliances, hot tub, pool equipment, smart home devices, linens, outdoor kitchen — get the conveyed-items list in writing. Anything in the photos that isn't conveyed reduces your depreciable base.
- Pull the county assessor land/improvement split. Your basis in land is not depreciable. The assessor's improvement ratio is the starting point for your allocation — see our land value ratio guide for the county lookup process.
- Verify state §168(k) conformity. Federal conforms at 100% under OBBBA. States vary — CA, NY, NJ, PA, MA, WI, OR require addback. If the STR is in a non-conforming state, model federal-only benefit before making the offer.
- Confirm STR license transferability. Some jurisdictions (Nashville, Scottsdale) transfer the permit; others (Sedona, Palm Springs, parts of Hawaii) require the new owner to reapply and may cap issuance. A non-transferable license kills the Year 1 STR loophole strategy.
- Ignore the seller's cost seg study if offered. It's tied to their basis and their acquisition date. Run a fresh buyer-side analysis on YOUR projected basis and today's finishes.
- Model the mid-year material participation risk. Count the weeks between projected closing and December 31. Confirm you can realistically log 100+ hours (and beat any single non-owner's hours) in that window before committing to the Year 1 strategy.
- Confirm placed-in-service date planning. If closing is late in the year, discuss whether to accept the property "as is" and place it in service immediately vs. running a short renovation cycle that pushes placed-in-service into January of the following year.
- Model your $99 buyer-side report BEFORE the offer. The point of pre-offer analysis is that the deduction becomes a term you can negotiate around. See how to use §168(k) before closing for the full pre-offer workflow.
The bigger picture
The used-property bonus depreciation rule under IRC §168(k)(2)(A)(ii) is one of the most consequential provisions in the tax code for STR investors — and it's the one most misunderstood in the investor community. Every operating STR listing you evaluate is bonus-eligible for you as long as the seller is unrelated and the mechanics of the acquisition are clean. The seller's history is their history. Your history starts at closing.
For an operating property, the pre-offer analysis is genuinely easier than for a new build. The property already exists. The Airbnb listing already shows every amenity, every finish, every outdoor feature. The occupancy history proves the 7-day rule is achievable. All the buyer needs is a fresh 5-year / 15-year / 39-year classification on their projected purchase price — and that's a 10-minute analysis with a photo-based tool, or a $5,000–$15,000 engagement with a cost seg firm.
Under OBBBA's permanent 100% bonus regime — see our OBBBA + STR loophole update for the full 2026 rules — the buyer-side reset works cleanly. Take the Year 1 deduction. Run the property as an STR. When you eventually sell, you'll face your own recapture — but that's a problem for future-you, with several legitimate planning paths available. In the meantime, don't leave six figures on the table because a BiggerPockets thread told you used property doesn't qualify.
Frequently asked questions
Can I take bonus depreciation on a used or previously-rented STR?
Yes. IRC §168(k)(2)(A)(ii), as amended by the Tax Cuts and Jobs Act in 2017, extends bonus depreciation eligibility to used property so long as it is the taxpayer's first use of that property (i.e., you did not previously own or use it) and the property was not acquired from a related party under IRC §179(d)(2). A short-term rental purchased in an arm's-length transaction from an unrelated seller qualifies for 100% bonus depreciation on the 5-year and 15-year components of your allocated purchase price, exactly the same as new construction. The One Big Beautiful Bill Act (OBBBA), signed in July 2025, preserved 100% bonus permanently for property placed in service after January 19, 2025.
Does the seller's cost segregation study transfer when I buy the property?
No. A cost segregation study is an engineering analysis tied to a specific taxpayer's basis in the property. When ownership changes, the seller's basis, the seller's depreciation schedule, and the seller's cost seg allocations all terminate. As the buyer, you start over with a new basis equal to your purchase price under IRC §1012 and you need a fresh cost seg analysis (or a photo-based equivalent) that classifies YOUR allocated basis into 5-year, 15-year, and 39-year buckets. The seller's study is a historical document with no application to your return.
Is there a stepped-up basis when I buy an existing rental?
Yes, in the practical sense that your cost basis equals what you paid, not what the seller had left on their depreciation schedule. Under IRC §1012, the basis of property is its cost. Your Year 1 depreciation is calculated on the purchase price you actually paid (less allocated land value), regardless of how much the seller had already depreciated the property down to. The seller's remaining basis does not carry over. This is what makes buying an operating STR so tax-efficient: you pay market price and get a fresh depreciation clock at that market price.
Can I claim the STR loophole in the same year I buy the property?
Yes, but the material participation test under Treasury Regulation §1.469-5T(a) is calendar-year-based, so a mid-year purchase compresses the window. The 7-day rule under Treasury Regulation §1.469-1T(e)(3)(ii)(A) applies to the average guest stay during your ownership period — you do not inherit the seller's booking history. If you buy in June and materially participate in the operation from placed-in-service date through year-end, the 100-hour and 500-hour thresholds must still be met within that ownership window. Investors buying late in the year (October or later) should model the participation risk carefully with their CPA before relying on Year 1 offset.
What happens to the seller's depreciation recapture when I buy their Airbnb?
The seller's recapture is entirely the seller's tax bill, not yours. When the seller closes, they trigger §1245 ordinary-income recapture on the 5-year and 15-year property they previously bonus-depreciated, plus §1250 unrecaptured gain (capped at 25%) on the 27.5-year structural portion. That recapture appears on the seller's return. As the buyer, you have no exposure to the seller's prior depreciation. You start fresh with your own basis under IRC §1012 and your own future recapture obligation if and when you eventually sell. Full explainer in our what happens to bonus depreciation when you sell your Airbnb writeup.
Does buying an existing STR let me take 100% bonus depreciation under OBBBA?
Yes. The One Big Beautiful Bill Act (OBBBA), signed in July 2025, restored 100% bonus depreciation permanently for qualified property placed in service after January 19, 2025. IRC §168(k)(2)(A)(ii) explicitly includes used property, and OBBBA did not carve out acquired property from the 100% rate. A buyer purchasing an existing operating short-term rental in 2026 takes 100% bonus on the 5-year personal property and 15-year land improvement components of their allocated basis in Year 1, subject to the placed-in-service and material participation requirements.
Do I need a new cost segregation study if the seller already had one done?
Yes. The seller's study is legally and mathematically inapplicable to your return. It was calculated on the seller's purchase price years ago, using engineering assumptions tied to the seller's acquisition date and the finishes that existed at that time. Your basis is different (higher, in almost every case), the depreciable pool is calculated on your basis, and any improvements the seller made after their study are already embedded in the current physical property but not itemized in their study. A buyer needs a fresh analysis calculated on the current purchase price. For most STR investors, a $99 DepreciMax property report or a $5,000–$15,000 formal engineered cost segregation study are the two options — the seller's old study is not an option.
Get the buyer-side number BEFORE you make the offer
DepreciMax turns the current listing photos of any operating short-term rental into a full 5-year / 15-year / 39-year classification against your projected purchase price. Line-item PDF, IRS §168(k) treatment, closely calibrated to a formal cost segregation study. $99 per report, or $149/month for unlimited reports if you're evaluating multiple operating listings. 30-day satisfaction-based guarantee.
Run a $99 Buyer-Side Report →This article is for educational purposes only and does not constitute tax or legal advice. IRC §168(k), IRC §1012, IRC §179(d)(2), Treasury Regulation §1.469-1T, and the One Big Beautiful Bill Act each involve technical requirements that vary by taxpayer situation. Related-party rules, state conformity, and material participation tests are especially fact-specific. Consult a qualified CPA or tax attorney familiar with short-term rental taxation before relying on any position discussed here.