Short-Term Rental Bought Late in the Year: Cost Segregation

A short-term rental bought in November or December can make a cost segregation deduction nonpassive on the 2026 return through the short-term rental exception only if, for a calendar-year taxpayer, the property is placed in service (ready and available for its intended use) by December 31, 2026, an exception in Treas. Reg. §1.469-1T(e)(3)(ii) takes it out of rental activity status, usually an average stay of seven days or less, and the owner materially participates during 2026 under Treas. Reg. §1.469-5T(a).

Cost segregation is the depreciation tool, not one of the tests: a study can move furniture, appliances, certain finishes and land improvements into 5- and 15-year property, but the part of 2026 after closing has to supply the readiness, the guest stays and the hours. The short-term rental loophole in general, and short-term rental cost segregation as a service, are covered elsewhere; this post answers the narrower question of a purchase in the last weeks of the year.

Can I use the short-term rental loophole if I buy late in 2026 and want cost segregation?

An owner can use the short-term rental exception after a late-2026 purchase only if the activity is not a rental activity for 2026 and the owner materially participates in it during 2026, because the phrase "short-term rental loophole" names no separate deduction and a cost segregation study changes neither test.

A short-term rental’s loss, including the depreciation a cost segregation study accelerates, can offset wages and other nonpassive income, but only when the property’s average period of customer use for the year is seven days or less (so that under Treas. Reg. §1.469-1T(e)(3)(ii)(A) it is not a rental activity), the taxpayer materially participates in it under one of the seven tests in Treas. Reg. §1.469-5T(a) (for example, more than 500 hours in the year, or more than 100 hours and not less than any other individual), and only to the extent the basis, at-risk (§465) and excess business loss (§461(l)) limits also allow it; the regulation’s other exceptions, such as an average stay of 30 days or less with significant personal services, are separate tests.

If the seven-day average-stay test fails and no other exception in Treas. Reg. §1.469-1T(e)(3)(ii) applies, cost segregation still accelerates the depreciation, but the rental's loss is passive under §469(c)(2) unless the owner is a real estate professional under §469(c)(7) who materially participates in it; if an exception in Treas. Reg. §1.469-1T(e)(3)(ii) applies and the owner does not materially participate, the loss is passive under §469(c)(1). A passive loss that passive income does not absorb is disallowed under §469(a) and carried forward under §469(b), apart from the §469(i) allowance, which covers only a rental real estate activity in which the owner actively participates and so does not reach an activity that an exception in Treas. Reg. §1.469-1T(e)(3)(ii) takes out of rental activity status.

For a calendar-year taxpayer, what does placed in service by December 31, 2026 mean for a short-term rental?

For a calendar-year taxpayer, a short-term rental is placed in service by December 31, 2026 only when it is in a condition or state of readiness and availability for its specifically assigned function (Treas. Reg. §1.46-3(d)(1)(ii) and Treas. Reg. §1.167(a)-11(e)(1)(i)), which for a short-term rental generally means ready and available for guests, not merely that escrow closed, furniture was ordered or a listing draft exists.

A property bought with furnishings, local approvals and operating systems already in place is usually placed in service at acquisition, while one that needs renovation, furnishing, licensing or safety work before guests can stay usually is not placed in service until that work is done. For a calendar-year taxpayer, property placed in service (ready and available for its intended use) by December 31, 2026 can be depreciated on the 2026 return, and property placed in service on January 1, 2027 or later is first depreciated on the 2027 return; a fiscal-year taxpayer uses the end of its own tax year instead.

Closing late in 2026 can matter, but closing alone is not the test, as buying a rental property late in the tax year explains. A cost segregation study of a property that was not ready and available in 2026 can support depreciation on a later return, but it creates no 2026 depreciation.

How is the short-term rental average-stay test measured when the booking history is tiny?

For one property, the average-stay test divides the total days of customer use by the number of stays, counting only stays that end during the tax year or include its last day (Treas. Reg. §1.469-1(e)(3)(iii)(C)), so a handful of bookings decides the result for a late-2026 purchase.

One long holiday booking can move the average on a short record, because the number of stays it is divided by is small. A stay that includes the last day of the tax year counts, and its length may be set by reasonable estimate (Treas. Reg. §1.469-1(e)(3)(iii)(D)). The regulation states no rule for a property with no stay that ended in the year or ran through its last day, so that fact pattern is a question for your tax advisor.

The other route is an average stay of 30 days or less with significant personal services provided by or on behalf of the owner (Treas. Reg. §1.469-1T(e)(3)(ii)(B)). Whether services are significant depends on how often they are provided, the type and amount of labor they take and their value relative to the amount charged, and only services performed by individuals count, not those commonly provided with long-term rentals of high-grade property (Treas. Reg. §1.469-1T(e)(3)(iv)). The regulation lists cleaning and maintenance of common areas among the excluded services but does not say whether cleaning a unit between stays is a significant personal service, so the operating model needs the same review as the cost segregation deduction.

How do material participation hours work when I owned the property for only part of 2026?

The material participation tests in Treas. Reg. §1.469-5T(a) are stated for the taxable year, and the regulation states no reduced number of hours for an owner who held the property for only part of it, so a late buyer has fewer weeks to meet the same tests. Work done while the individual owns an interest in the activity is participation (Treas. Reg. §1.469-5(f)(1)), and an example in §1.469-5T(k) treats an individual as not participating before acquiring the interest, so hours before closing generally do not count. No regulation states directly whether hours after closing but before the first guest count toward these tests, so that is a question for your tax advisor.

The tests usually in play for a new short-term rental are more than 500 hours during the year (§1.469-5T(a)(1)), more than 100 hours and not less than the participation of any other individual (§1.469-5T(a)(3)), and substantially all of the participation of all individuals (§1.469-5T(a)(2)); an owner who participates more than 100 hours in this activity and in other significant participation activities may also meet §1.469-5T(a)(4), which counts more than 500 hours across all of them. The §1.469-5T(a)(2) and (a)(3) tests count individuals who are not owners, so hours worked by cleaners, co-hosts, contractors and property managers can defeat them. For an owner whose only short-term rental activity is this property, a test that looks back at earlier years (§1.469-5T(a)(5) and (6)) has nothing to look at; an owner who groups it with an existing short-term rental activity under Treas. Reg. §1.469-4(c) may have earlier years to count. The facts-and-circumstances test fails at 100 hours or less (§1.469-5T(a)(7) and (b)(2)(iii)).

A spouse's participation counts (§1.469-5T(f)(3)), and work as an investor, such as reviewing financial reports, does not unless the individual is directly involved in day-to-day management or operations (§1.469-5T(f)(2)(ii)). Participation is counted for the tax year and may be shown by any reasonable means (§1.469-5T(f)(4)), so a log kept from the first week is the simplest record. For an owner who also holds longer-term rentals, the real estate professional hours are a separate question.

What does cost segregation change on a 2026 return if the short-term rental qualifies?

Cost segregation moves supported parts of the depreciable basis out of the 27.5- or 39-year structure and into 5-, 7- and 15-year property, and that property can take 100% bonus depreciation under §168(k), as amended by OBBBA, when it is qualified property acquired after January 19, 2025 and placed in service during 2026. For that test the acquired date is not the closing date: under IRS Notice 2026-11 property bought under a written binding contract is acquired on the latest of the date the contract was signed, the date it became enforceable under state law, the end of any cancellation period and the date any contingency was satisfied, under a contract that is not binding (for example, one that limits damages to a specified amount) it is generally when more than 10 percent of the total cost, excluding land and preliminary activities, has been paid or incurred, and self-constructed property, including property built for the taxpayer under a written binding contract signed before construction began, is acquired when physical work of a significant nature begins (Treas. Reg. §1.168(k)-2(b)(5)); and used property qualifies only if the taxpayer had not used it at any time before acquiring it and the acquisition meets the §179(d) purchase rules that §168(k)(2)(E)(ii) applies (for example, it was not acquired from a related party, by gift or inheritance, or with a carryover basis).

A late-2026 purchase of an existing rental is generally used property, so the used-property condition above applies to the components identified in the building and to any furnishings that come with it; furniture the owner buys new for the rental is original-use property under §168(k)(2)(A)(ii). Qualified property acquired on or before January 19, 2025 and placed in service in 2026 stays on the TCJA phase-down at 20% (other than long-production-period property and certain aircraft under §168(k)(2)(B) and (C), which run a year behind).

Bonus depreciation never reaches land or the structure. Under IRC §168(e)(2)(A), a building is 27.5-year residential rental property only if 80% or more of its gross rental income for the taxable year (counting the rental value of any part the taxpayer occupies) is rental income from dwelling units, and under §168(e)(2)(A)(ii) a unit in a hotel, motel or other establishment more than half of whose units are used on a transient basis is not a dwelling unit, so a building rented mostly to short-term guests can be 39-year nonresidential real property instead. That is a different test from the seven-day test in the §469 regulations.

Does the mid-quarter convention apply to a short-term rental bought late in 2026?

The mid-quarter convention can apply to a late-2026 purchase, because for a calendar-year taxpayer property placed in service (ready and available for its intended use) from October 1 through December 31, 2026 is placed in service in the last three months of the tax year, and §168(d)(3)(A) applies the mid-quarter convention to all of the year's property other than residential rental and nonresidential real property (Treas. Reg. §1.168(d)-1(a)) when more than 40% of its aggregate basis went into service in those months.

Because the building itself is left out of that test (§168(d)(3)(B)) and stays on the mid-month convention (§168(d)(2)), an owner whose only property other than buildings placed in service in 2026 comes from the late purchase has all of it in the last three months, so the convention applies unless other such property placed in service earlier in 2026 brings that share to 40% or less. Bonus depreciation does not reduce the basis counted in the test (Treas. Reg. §1.168(k)-2(g)(11)), but a §179 election does (Treas. Reg. §1.168(d)-1(b)(4)(i)). Fourth-quarter property under the convention gets one and a half months of first-year regular depreciation (§168(d)(4)(C)), while bonus depreciation is figured on the unadjusted depreciable basis (Treas. Reg. §1.168(k)-2(e)(1)(ii)), so the convention matters mainly for property on which bonus is not claimed; the mid-quarter convention and fourth-quarter property works through it.

When does a late-2026 short-term rental cost segregation study not help?

A late-2026 short-term rental cost segregation study does not help the 2026 return if the property was not placed in service during 2026, if the §469 facts make the loss passive, or if another loss limit stops the deduction. A cost segregation study is worth it when three conditions hold together: the basis is large enough for the accelerated deductions to outweigh the cost of the study, the deduction is usable this year given the owner's passive-activity position, and the hold is long enough to survive recapture. All three, or the honest answer is no.

Cost segregation accelerates deductions; over the life of the building the same basis is recovered. On a taxable sale at a gain, recapture applies, up to the amount of that gain, however long the property was held, outside the Opportunity Zone 10-year rule (a qualifying investment held 10 years with the IRC §1400Z-2(c) election): §1245 recapture on the 5- and 7-year property is ordinary income, as is §1250 recapture of the depreciation taken above straight-line (bonus included) on 15-year land improvements held more than one year, and the rest of the depreciation on those land improvements and on the 27.5- or 39-year structure is unrecaptured §1250 gain, taxed at up to 25% for a noncorporate taxpayer.

What records does a late-2026 short-term rental cost segregation study need?

A late-2026 short-term rental cost segregation study uses the closing or settlement statement, construction costs and invoices or contractor pay applications, and a land-value source such as an assessor ratio or appraisal, and the §469 questions need the 2026 booking record and a record of who did what work and for how many hours. For a calendar-year taxpayer, a property placed in service in 2026 is depreciated on the original 2026 return and needs no Form 3115.

If you are comparing providers, our guide to the best cost segregation companies sets out what to ask. The next step is the cost segregation qualifier. Whether the right answer is a 2026 study, a later-year study or no study turns on the placed-in-service date and whether the loss is usable, and your tax advisor confirms both.

Frequently Asked Questions

Can cost segregation make my late-2026 short-term rental loss nonpassive?

Cost segregation can make a late-2026 short-term rental loss larger but not nonpassive: through the short-term rental exception the loss is nonpassive only if the activity is not a rental activity under Treas. Reg. §1.469-1T(e)(3)(ii), usually because the average stay for 2026 is seven days or less, and you materially participate under Treas. Reg. §1.469-5T(a). Otherwise a passive loss that passive income does not absorb is generally disallowed under §469(a) and carried forward under §469(b).

Can I claim 2026 depreciation if my short-term rental is listed but not ready for guests?

A short-term rental that is listed but not ready for guests generally cannot take 2026 depreciation, because for a calendar-year taxpayer it has to be placed in service (ready and available for its intended use) by December 31, 2026 under Treas. Reg. §1.46-3(d)(1)(ii). Unfinished furnishing or an open safety or licensing item can show it was not yet ready.

Does a cost segregation study change the short-term rental average-stay test?

A cost segregation study does not change the average-stay test, because that test is measured from periods of customer use under Treas. Reg. §1.469-1(e)(3)(iii), not from the depreciation schedule. The study changes classifications; the booking record decides whether the exception applies.

Is a short-term rental 27.5-year or 39-year property for cost segregation?

A short-term rental building can be 27.5-year or 39-year property, depending on how it is rented. Under IRC §168(e)(2)(A), a building is 27.5-year residential rental property only if 80% or more of its gross rental income for the taxable year (counting the rental value of any part the taxpayer occupies) is rental income from dwelling units, and under §168(e)(2)(A)(ii) a unit in a hotel, motel or other establishment more than half of whose units are used on a transient basis is not a dwelling unit, so a building rented mostly to short-term guests can be 39-year nonresidential real property instead. Either way, the 5-, 7- and 15-year property a cost segregation study identifies is depreciated on its own shorter schedule.

Do the material participation hours shrink if I buy a short-term rental in December?

The regulations state no smaller number for a December purchase: Treas. Reg. §1.469-5T(a) sets the tests for the taxable year with no reduced figure for a part-year owner, and hours before closing generally do not count (Treas. Reg. §1.469-5(f)(1) and §1.469-5T(k), Example 6). A late buyer who cannot reach more than 500 hours after closing is left mainly with the more-than-100-hour test, which also requires participation not less than any other individual's, or the substantially-all test in §1.469-5T(a)(2).

Is a cost segregation study a reason to buy a short-term rental late in the year?

A cost segregation study is not a reason by itself to buy a short-term rental or to rush one into service late in the year, because depreciation accelerates recovery of the same basis rather than creating new money. A study fits when the property is in real business use, the §469 and other loss limits let the deduction matter, and the recapture on a later taxable sale is acceptable.

Can I Use Cost Segregation With the Short-Term Rental Loophole if I Buy Late in 2026?