If a calendar-year taxpayer is counting real estate professional hours toward the more-than-750-hour test as 2026 closes, a cost segregation study helps only if the documented 2026 participation makes the rental loss usable under §469 and the property is placed in service for the 2026 return.
The cost segregation question is not just, “How much depreciation can the study identify?”; the cost segregation question for a high-income rental owner is, “Will the accelerated depreciation be allowed against income on my 2026 return after §469, §465, and §461(l) are applied?”
Can real estate professional hours make my 2026 cost segregation deduction usable?
Yes, real estate professional status can make a 2026 cost segregation deduction usable when §469(c)(7) is satisfied for the 2026 tax year and the taxpayer also materially participates in the rental activity for that same tax 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.
Because each rental is tested separately for material participation unless that grouping election was made, a cost segregation study on one rental does not become usable merely because the owner was busy with real estate generally.
Participation is counted for the tax year and must be real and documented under §469 and Treas. Reg. §1.469-5T(a), so hours not actually worked in 2026 should not be counted toward real estate professional status or rental material participation.
If a rental loss is nonpassive and can offset wages, business income, or other nonpassive income, that offset still applies only when the taxpayer has sufficient basis, is not limited by the at-risk rules under §465, and is not limited by the excess business loss rules under §461(l).
For a broader passive-loss overview, see our §469 cost segregation passive-activity guide; this article focuses on the hour tests that are being met or missed during the 2026 tax year.
What does placed in service mean for a rental property on the 2026 return?
Property is placed in service when it is in a condition or state of readiness and availability for its specifically assigned function under Treas. Reg. §1.46-3(d)(1)(ii) and Treas. Reg. §1.167(a)-11(e)(1)(i), so a rental property is placed in service when it is ready and available to rent.
For a calendar-year taxpayer, property placed in service by December 31, 2026 can be depreciated on the 2026 return, and a cost segregation study can separate eligible shorter-life components for that 2026 depreciation schedule.
For a calendar-year taxpayer, property placed in service on January 1, 2027 or later is first depreciated on the 2027 return, even if the owner was tracking 2026 participation hours and even if the acquisition occurred during 2026.
A property bought with tenants in place is usually placed in service at acquisition under Treas. Reg. §1.46-3(d)(1)(ii) when it is ready and available for its rental function, while a property needing renovation before it can be rented usually is not placed in service until the renovation makes it ready and available to rent.
For a fiscal-year taxpayer, depreciation begins in the tax year in which the property is placed in service under Treas. Reg. §1.46-3(d)(1)(ii), using the fiscal year rather than the calendar-year return period.
Which 2026 hour tests should I be tracking for a long-term rental?
For a long-term rental, an owner who wants cost segregation depreciation to be nonpassive on the 2026 return needs records supporting both the §469(c)(7) real estate professional tests and the rental-level material participation test under Treas. Reg. §1.469-5T(a).
A rental activity is passive under §469(c)(2) unless an exception such as §469(c)(7) applies, and a passive loss that passive income does not absorb is disallowed under §469(a) and carried forward under §469(b).
That means a high-income owner who does not qualify under §469(c)(7), does not materially participate in the rental, and does not have enough passive income may see a cost segregation study create a carried-forward passive loss rather than a current-year cash-flow benefit.
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.
For an owner whose modified adjusted gross income is $150,000 or more (or $75,000 or more for a married individual filing separately who lived apart from the spouse all year), the §469(i) allowance is fully phased out, so the real 2026 planning issue is whether documented hours satisfy §469(c)(7) and Treas. Reg. §1.469-5T(a).
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.
ClickDrag Finance year-end cost segregation planning framework
How does the short-term rental exception change the cost segregation answer?
A short-term rental can avoid rental-activity classification when the average period of customer use is seven days or less under Treas. Reg. §1.469-1T(e)(3)(ii)(A), but its loss is nonpassive only when the owner materially participates under Treas. Reg. §1.469-5T(a).
An activity is also not a rental activity when the average period of customer use is 30 days or less and significant personal services are provided by or on behalf of the owner under Treas. Reg. §1.469-1T(e)(3)(ii)(B), but the loss is nonpassive only with material participation under Treas. Reg. §1.469-5T(a).
For a short-term rental owner, cost segregation may create large depreciation deductions because furniture, appliances, certain site improvements, and interior components may fall into shorter recovery classes, but the 2026 deduction is usable against nonpassive income only if one of the Treas. Reg. §1.469-1T(e)(3)(ii) exceptions above applies, the owner materially participates under Treas. Reg. §1.469-5T(a), and the basis, at-risk rules under §465, and excess business loss rules under §461(l) allow it.
Short-term rental participation should be documented as the services are performed during the 2026 tax year, because Treas. Reg. §1.469-5T(a) looks to actual participation and not to hours reconstructed without support.
For the short-term rental-specific analysis, see our short-term rental cost segregation guide, and use this article to test whether the hours you are accumulating in 2026 can make the deduction usable.
What does cost segregation change on the 2026 depreciation schedule?
Cost segregation changes the 2026 depreciation schedule by identifying building components that may be depreciated over shorter MACRS recovery periods and, when §168(k) applies, may qualify for bonus depreciation.
Residential rental property uses a 27.5-year recovery period under §168(c), nonresidential real property uses a 39-year recovery period under §168(c), and both use the mid-month convention under §168(d).
Other MACRS property identified by cost segregation, such as 5-year personal property, 7-year property, and 15-year land improvements, 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 property, nonresidential real property, and property placed in service and disposed of in the same year from the test.
For a calendar-year taxpayer, property placed in service from October 1 through December 31, 2026 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 under §168(k) is not reduced by a convention, so the mid-quarter convention under §168(d)(3) 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.
Under §168(k) as amended by OBBBA, bonus depreciation is 100% for qualified property acquired after January 19, 2025, and IRS Notice 2026-11 ties acquisition under a written binding contract 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 for §168(k) purposes is enforceable under state law and does not limit damages to a specified amount, such as through a liquidated damages clause, under Treas. Reg. §1.168(k)-2(b)(5)(iii).
Under a contract that is not binding for §168(k) purposes, the acquired date is generally when the taxpayer has paid or incurred more than 10% 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).
Self-constructed property, including property built for the taxpayer under a written binding contract entered into before construction began, is acquired for §168(k) when physical work of a significant nature begins under Treas. Reg. §1.168(k)-2(b)(5)(iv), and paying or incurring more than 10% of the total cost excluding land and preliminary activities is a safe harbor under 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 generally remains on the TCJA phase-down with 20% bonus depreciation for 2026 under §168(k), except long-production-period property and certain aircraft under §168(k)(2)(B) and §168(k)(2)(C).
Bonus depreciation under §168(k) applies only to qualified property with a recovery period of 20 years or less, including the 5-year, 7-year, and 15-year property a cost segregation study may identify, and it does not apply to land or the 27.5-year or 39-year building shell under §168(c).
Used property qualifies for bonus depreciation only when the used-property rules of §168(k)(2)(E)(ii) are met, and a taxpayer may elect out of bonus depreciation for a class of property for a year under §168(k)(7).
When would a cost segregation study not help my 2026 return?
A cost segregation study may not help your 2026 return when the property is not placed in service for the 2026 tax year, the §469 loss is passive and not absorbed by passive income, or the accelerated depreciation is not valuable after recapture and ownership plans are considered.
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: §1245 recapture on 5-year and 7-year property is ordinary income, §1250 recapture of depreciation taken above straight-line including bonus on 15-year land improvements held more than one year is ordinary income, and the rest of the depreciation on those land improvements and on the 27.5-year or 39-year structure is unrecaptured §1250 gain taxed at up to 25% for a noncorporate taxpayer.
For an investment made through a qualified opportunity fund, Opportunity Zone cost segregation planning explains how the IRC §1400Z-2(c) election, for a qualifying investment held at least 10 years and applied on a sale of the qualified opportunity fund interest, can change the exit analysis.
Cost segregation accelerates deductions under MACRS, and over the life of the building the same basis is recovered through depreciation.
For a building placed in service in 2026, the cost segregation result goes on the 2026 return and needs no Form 3115 because the depreciation method is being set on the original return.
For a building you placed in service in 2024 or earlier and still own at the start of 2026, Form 3115 filed with the 2026 return can report missed depreciation as a §481(a) adjustment, with no amended returns, when the property has been depreciated on two or more filed returns and the eligibility rules in section 6.01 of Rev. Proc. 2025-23 and the procedures of Rev. Proc. 2015-13 are met.
For a building you placed in service in 2025 with the 2025 return filed and still owned at the start of 2026, Form 3115 filed with the 2026 return under section 6.01 of Rev. Proc. 2025-23 and Rev. Proc. 2015-13 or an amended 2025 return filed before the 2026 return is filed are both available routes, subject to eligibility rules your tax advisor should confirm.
A prior election out of bonus depreciation cannot be undone through the automatic change in section 6.01(1)(c)(vi) of Rev. Proc. 2025-23.
What records should I gather now to decide whether cost segregation fits?
Participation records, property documents, and depreciation records are worth gathering before the year closes because the cost segregation decision depends on both the engineering allocation and the 2026 usability of the deduction under §469.
For participation, keep contemporaneous records showing the services actually performed, the rental or real property trade or business served, the date of the work, and enough detail for your tax advisor to evaluate §469(c)(7), Treas. Reg. §1.469-5T(a), and any short-term-rental exception under Treas. Reg. §1.469-1T(e)(3)(ii).
For the cost segregation review, gather the closing or settlement statement, construction costs and invoices or contractor pay applications, the current depreciation schedule, and a land-value source such as an assessor ratio or appraisal.
ClickDrag Finance studies are built on the methodology in the IRS Cost Segregation Audit Techniques Guide, and the output is designed to help your tax advisor classify assets, apply §168(k), apply §168(d), and determine whether the deduction is usable under §469.
An owner who wants a first screen before committing to a study can start with the cost segregation qualifier.
If you want to compare provider models before selecting a study process, see our guide to cost segregation companies and focus on whether the provider can support your CPA’s year-end planning question rather than just produce a depreciation number.
Related reading: Placed in Service by December 31: Calendar-Year Rental Depreciation and Cost Segregation for 2026, Bonus Depreciation in 2026: What Real Estate Owners Need to Know and The January 19, 2025 Line: How the Acquired-Date Test Sets Your Bonus Depreciation Rate.
Related: Excess Business Loss Limit and Cost Segregation: Why a 2026 Depreciation Loss May Be Deferred.
Related: Cost Segregation for a Development Placed in Service in Phases.
Frequently Asked Questions
Does real estate professional status automatically make cost segregation depreciation usable?
No, real estate professional status makes cost segregation depreciation usable only when §469(c)(7) is satisfied for the tax year, the taxpayer materially participates in the rental under Treas. Reg. §1.469-5T(a), and the basis, at-risk rules under §465, and excess business loss rules under §461(l) do not block the deduction.
Can I count projected hours for the 750-hour real estate professional test?
No, §469(c)(7) uses hours actually worked during the tax year, so projected hours that are not actually worked and documented for 2026 should not be counted toward the more-than-750-hour real property trade or business test.
Can short-term rental cost segregation offset W-2 wages?
Yes, 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.
Do my spouse's hours count toward the 750-hour test?
No, on a joint return one spouse must meet both real estate professional tests alone, so the spouses' hours are not combined for those tests, although a spouse's participation does count toward the taxpayer's material participation in the rental activity under Treas. Reg. §1.469-5T(f)(3).
What is the next step before ordering a cost segregation study?
Whether the property is placed in service, whether the 2026 depreciation would be usable under §469, and whether the expected acceleration justifies a study under the ownership plan are questions for the tax advisor; the cost segregation qualifier is a first screen before that conversation.