Buying a Rental Property Before Year-End: Cost Segregation

Buying a rental or commercial property before year-end helps your 2026 depreciation only if cost segregation applies to property that, for a calendar-year taxpayer, is placed in service before year-end as ready and available for rent or commercial use under Treas. Reg. §1.46-3(d)(1)(ii).

Cost segregation does not turn a closing into a tax deduction by itself; cost segregation separates eligible building-related costs into shorter recovery periods after the property is placed in service, and the 2026 result depends on readiness, §168(k) bonus depreciation, §168(d) conventions, and §469 loss limits.

Does a November or December 2026 closing create a 2026 depreciation deduction?

For a calendar-year taxpayer, a November or December 2026 closing creates 2026 depreciation only when the property is placed in service by December 31, 2026 as ready and available for its intended rental or commercial use under Treas. Reg. §1.46-3(d)(1)(ii). The settlement statement proves ownership and helps establish depreciable basis, but the closing date alone does not prove that the property was ready for its assigned function.

If you buy a stabilized duplex, apartment building, retail strip, office, or warehouse with tenants already in place, the property is usually placed in service at acquisition because the rental or commercial function is already occurring. If you buy a vacant property that needs habitability work, utility restoration, permitting, or substantial renovation before it can be rented, the property usually is not placed in service until the work makes it ready and available under Treas. Reg. §1.167(a)-11(e)(1)(i).

That distinction matters before you order a cost segregation study. Cost segregation accelerates recovery of the same basis; it does not create new money, and buying a property for the deduction alone is not sound planning.

What does placed in service mean for a late-2026 rental purchase?

Placed in service means the property is in a condition or state of readiness and availability for a specifically assigned function under Treas. Reg. §1.46-3(d)(1)(ii) and Treas. Reg. §1.167(a)-11(e)(1)(i). For a rental, that function is being ready and available to rent, not merely being owned, listed, photographed, or under repair.

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 (ready and available for its intended use) 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 of the calendar-year cutoff.

A property bought with tenants in place usually meets the readiness test at acquisition, assuming the owner is continuing the rental activity. A property bought for renovation usually meets the readiness test later, when the property can legally and practically be rented for its assigned use.

Ask this practical question: if a qualified tenant arrived after closing, could the property be used for its specifically assigned rental or commercial function without unfinished required work?
Planning question based on Treas. Reg. §1.46-3(d)(1)(ii)

How does cost segregation change the 2026 return if the property is ready to rent?

Cost segregation changes the 2026 return by moving eligible portions of the depreciable basis out of the 27.5-year residential rental building or the 39-year nonresidential building under §168 and into shorter-life property under §168. A cost segregation study built on the methodology in the IRS Cost Segregation Audit Techniques Guide may identify 5-year, 7-year, and 15-year MACRS property under §168 from the same total project or purchase basis.

Without cost segregation, most depreciable basis often sits in the building shell under §168. With cost segregation, eligible short-life property may qualify for faster regular depreciation under §168 and possible bonus depreciation under §168(k), while land remains nondepreciable under §167 and §168.

Residential rental real property and nonresidential real property always use the mid-month convention under §168(d), so a building shell placed in service in December receives half a month of first-year depreciation under §168(d). Other MACRS property identified by cost segregation uses the half-year convention under §168(d) unless the mid-quarter convention applies under §168(d)(3).

Under §168(d)(3)(A), the mid-quarter convention applies when the aggregate basis of property placed in service during the last three months of the tax year is more than 40% of the aggregate basis of all property placed in service during that year, and §168(d)(3)(B) excludes residential rental real property, nonresidential real property, and property placed in service and disposed of in the same tax year from the test. For a calendar-year taxpayer, property placed in service from October 1 through December 31 is placed in service in the last three months under §168(d)(3), and fourth-quarter property under the mid-quarter convention receives one and a half months of first-year regular depreciation under §168(d).

Bonus depreciation is not reduced by any convention under §168(k), so the mid-quarter convention matters mainly for property on which bonus depreciation is not claimed. Basis expensed under §179 is left out of the 40% test (Treas. Reg. §1.168(d)-1(b)(4)); have the tax advisor confirm how bonus-depreciated basis is counted and run the test on the full placed-in-service schedule.

Does bonus depreciation depend on the closing date or the acquired date?

Bonus depreciation depends on the acquired date under §168(k) and IRS Notice 2026-11, not simply on the closing date. For qualified property acquired after January 19, 2025 under §168(k) as amended by OBBBA, 100% bonus depreciation is permanent when the property is otherwise eligible qualified property.

For a written binding contract, IRS Notice 2026-11 ties the acquired date to 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 Treas. Reg. §1.168(k)-2(b)(5)(ii)(B). A written binding contract is one enforceable under state law that does not limit damages to a specified amount (for example through a liquidated damages clause) under Treas. Reg. §1.168(k)-2(b)(5)(iii).

If the contract is not binding in that sense, the acquired date is generally when the taxpayer has paid or incurred more than 10 percent of the total cost, excluding land and preliminary activities, under Treas. Reg. §1.168(k)-2(b)(5)(iii) and Treas. Reg. §1.168(k)-2(b)(5)(v). For self-constructed property, including property built for the taxpayer under a written binding contract entered into before construction began, acquisition generally occurs when physical work of a significant nature begins, and paying or incurring more than 10 percent of the total cost excluding land and preliminary activities is a safe harbor under Treas. Reg. §1.168(k)-2(b)(5)(iv), with the more-than-10-percent safe harbor in Treas. Reg. §1.168(k)-2(b)(5)(iv)(B)(2).

Qualified property acquired on or before January 19, 2025 and placed in service in 2026 remains on the TCJA phase-down at 20% for 2026 under §168(k), except long-production-period property and certain aircraft described in §168(k)(2)(B) and §168(k)(2)(C), whose rates run one year later under §168(k)(6)(B). Bonus depreciation under §168(k) applies only to property with a recovery period of 20 years or less, including eligible 5-year, 7-year, and 15-year property identified by a cost segregation study, and bonus depreciation under §168(k) never applies to land, the 27.5-year residential rental shell, or the 39-year nonresidential shell.

Used property can qualify for bonus depreciation only when the used-property rules of §168(k)(2)(E)(ii) are met. A taxpayer may elect out of bonus depreciation for a class of property for a tax year under §168(k)(7), so the cost segregation plan should match the owner’s income profile, passive-activity position, and exit plan.

Will §469 let you use the cost segregation deduction on the 2026 return?

Section 469 decides whether a rental loss produced by cost segregation is usable on the 2026 return, because a rental activity is passive under §469(c)(2) unless an exception such as §469(c)(7) applies. A passive loss that passive income does not absorb is disallowed under §469(a) and carried forward under §469(b).

Under §469(i), an individual who actively participates in a rental real estate activity (a separate test from material participation, and one that requires an interest of at least 10% by value (a spouse’s interest counts) throughout the year) is exempt from the §469(a) disallowance for up to $25,000 of loss from the rental real estate activities in which the individual actively participates; the $25,000 is reduced by 50% of modified adjusted gross income above $100,000 and is gone at $150,000, and for a married individual filing separately it is $12,500, phasing out between $50,000 and $75,000, only if the spouses lived apart for the entire year, and zero if they lived together at any time during the year.

Under §469(c)(7), a taxpayer is a real estate professional only if more than one-half of the personal services the taxpayer performs in trades or businesses during the year are performed in real property trades or businesses in which the taxpayer materially participates, and the taxpayer performs more than 750 hours of services during the year in real property trades or businesses in which the taxpayer materially participates (on a joint return, one spouse must meet both tests alone); the rental loss is then nonpassive only if the taxpayer also materially participates in that rental activity, with each rental tested separately unless the election under Treas. Reg. §1.469-9(g) to treat all interests in rental real estate as one activity was made.

An activity is not a rental activity when the average period of customer use is seven days or less under Treas. Reg. §1.469-1T(e)(3)(ii)(A), or 30 days or less with significant personal services provided by or on behalf of the owner under Treas. Reg. §1.469-1T(e)(3)(ii)(B), and either loss is nonpassive only with material participation under Treas. Reg. §1.469-5T(a). Participation is counted for the tax year and must be real and documented.

If a cost segregation deduction is nonpassive under §469, the loss can offset wages or other nonpassive income only when the basis limits, at-risk limits under §465, and excess business loss limits under §461(l) also allow it. Under §469(g), a suspended passive loss is released, meaning it is treated as a loss that is not from a passive activity, when the taxpayer disposes of the entire interest in the activity in a fully taxable transaction (one in which all gain or loss realized is recognized) to an unrelated party.

When is cost segregation not worth doing for a late-2026 purchase?

Cost segregation is not worth doing when the accelerated deduction is too small, unusable under §469, or mismatched with the owner’s sale plan. 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.

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 rule that, for a qualifying investment held at least 10 years with the IRC §1400Z-2(c) election, applies on a sale of the qualified opportunity fund interest. Section 1245 recapture applies to 5-year and 7-year property, §1250 recapture of depreciation taken above straight-line applies to 15-year land improvements, and the 27.5-year or 39-year structure can produce unrecaptured §1250 gain taxed at up to 25% under §1(h).

If the property is in an Opportunity Zone structure, read our Opportunity Zone cost segregation guide because, for a qualifying investment held at least 10 years with the IRC §1400Z-2(c) election, a sale of the qualified opportunity fund interest can change the exit analysis. If you are comparing provider approaches, our best cost segregation companies guide explains how to review scope, engineering work, and tax support.

The ClickDrag cost segregation qualifier is a first screen for whether cost segregation is worth a closer look on a specific property before the 2026 planning is finalized.

What documents should you gather while the late-2026 deal is closing?

An owner closing a late-2026 purchase can gather the documents that support basis, readiness, and depreciation reporting for the 2026 return while the deal closes. A cost segregation study typically uses the closing or settlement statement, construction costs and invoices or the contractor’s pay applications, the current depreciation schedule, and a land-value source such as an assessor ratio or appraisal.

For a purchase with tenants in place, keep the rent roll, leases, settlement statement, and post-closing records showing that the rental or commercial function continued. For a renovation property, keep the contractor scope, invoices, certificates, utility records, and leasing records showing when the property became ready and available for rent.

Cost segregation is most useful when the study can connect asset classifications to source documents instead of relying only on broad estimates. If the property has acquisition basis and post-closing improvements, separate the records so the depreciation schedule can distinguish purchased components from newly placed-in-service improvement property.

What if you miss cost segregation on the original return?

If the property is placed in service in 2026, the cost segregation results belong on the original 2026 return, and Form 3115 is not needed for that current-year placement. If you later discover that depreciation was missed or classified too slowly, the correction route depends on the placed-in-service year, filed returns, continued ownership, and eligibility rules.

Form 3115 filed with the current-year return reports missed depreciation as a §481(a) adjustment, with no amended returns, when the property has been depreciated on two or more filed returns, or on one filed return if the taxpayer placed it in service in the tax year immediately before the year of change and the taxpayer still owned the property at the start of the year of change and meets the other eligibility rules. This automatic accounting-method change is listed in section 6.01 of Rev. Proc. 2025-23 and is filed under the procedures of Rev. Proc. 2015-13.

On a 2026 calendar-year return, a building placed in service in 2026 goes on the 2026 return and needs no Form 3115. For a building you placed in service in 2024 or earlier and still own, Form 3115 can be used with the 2026 return under section 6.01 of Rev. Proc. 2025-23 and Rev. Proc. 2015-13 if eligibility rules are met.

For a building you placed in service in 2025 with the 2025 return filed, Form 3115 with the 2026 return or an amended 2025 return filed before the 2026 return is filed are both available if the eligibility rules are satisfied. A prior election out of bonus depreciation cannot be undone through this change under section 6.01(1)(c)(vi) of Rev. Proc. 2025-23, so confirm the route with your tax advisor.

Frequently Asked Questions

Does closing in December 2026 guarantee depreciation on the 2026 return?

No, for a calendar-year taxpayer, depreciation on the 2026 return requires the property to be placed in service by December 31, 2026 as ready and available for rent or commercial use under Treas. Reg. §1.46-3(d)(1)(ii). Closing supports ownership and basis, but readiness starts depreciation.

Can cost segregation help if the rental needs renovation after closing?

Cost segregation can help only after the property or the specific improvement property is placed in service under Treas. Reg. §1.46-3(d)(1)(ii). If renovation is required before the property can be rented, depreciation usually waits until the property is ready and available for rent.

Does cost segregation make bonus depreciation available on the whole building?

No, cost segregation does not make the whole building eligible for bonus depreciation because §168(k) applies only to qualified property with a recovery period of 20 years or less. The 27.5-year residential rental shell under §168, the 39-year nonresidential shell under §168, and land are outside bonus depreciation.

Are closing costs part of the depreciable basis a cost segregation study allocates?

Generally yes for acquisition costs: costs that facilitate the purchase, such as title insurance, recording fees, transfer taxes, and legal fees for the acquisition, are generally capitalized into the property’s cost basis under §1012 and Treas. Reg. §1.263(a)-2(f), and that basis is allocated between nondepreciable land and the depreciable building before a cost segregation study reclassifies part of the building basis into 5-, 7- and 15-year property. Loan costs such as points and lender fees are generally not part of the property’s basis and are instead recovered over the loan term, so the tax advisor confirms how each line of the settlement statement is treated.

Should I order a cost segregation study just because I am buying before year-end?

No, a cost segregation study fits a year-end purchase only when, for a calendar-year taxpayer, the property is placed in service (ready and available for its intended use) by December 31, 2026, the basis is large enough for the accelerated deductions to outweigh the cost of the study, the accelerated deduction is usable under §469, and the expected hold fits the recapture analysis under §1245 and §1250. Buying for a deduction alone is not sound because depreciation accelerates recovery of basis rather than creating new income.

Buying a Rental Property in Late 2026: Cost Segregation and Depreciation