Excess Business Loss Limit and Cost Segregation

A large cost segregation loss that clears the §469 passive-activity rules can still be limited for 2026 by §461(l), because §461(l) applies to taxpayers other than corporations (an S corporation’s or partnership’s items reach it at the shareholder or partner level) and §461(l)(1) disallows an excess business loss for the year. For a high-income owner or real estate professional, the cost segregation question is not only how much depreciation the study creates, but how much of that depreciation survives §469, §465, §461(l), and the net operating loss rules for the 2026 return.

Cost segregation accelerates depreciation by identifying building components that are not part of the 27.5-year residential rental or 39-year nonresidential real property shell under §168, and that acceleration can be useful only when the owner’s 2026 tax posture can absorb it or carry it forward on acceptable terms. A cost segregation study should be modeled against the excess business loss limit before the return position is chosen, because bonus depreciation under §168(k) can create a deduction that is real but partly deferred.

Can §461(l) limit a 2026 cost segregation loss even if I am a real estate professional?

Yes, §461(l) can limit a 2026 cost segregation loss when the loss is nonpassive after §469, because §461(l) applies after the passive-activity rules to taxpayers other than corporations (an S corporation’s or partnership’s items reach it at the shareholder or partner level). Under §461(l)(3)(A), an excess business loss is the amount by which aggregate deductions from trades or businesses exceed aggregate gross income and gains from trades or businesses plus a threshold amount that is indexed for inflation and doubled for a joint return.

The ordering matters for a real estate professional because 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). If §469 disallows the rental loss first, the disallowed passive loss does not reach §461(l) for that year. For the passive-activity side of this ordering, see Will Cost Segregation Help If My Rental or Short-Term Rental Loss Is Passive?

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. A nonpassive cost segregation loss can offset wages or other nonpassive income only after the basis limits, the at-risk limits under §465, and the excess business loss limit under §461(l) also allow the deduction.

Wages earned as an employee are not counted as business income for the §461(l) test, so a high salary does not increase the business-income side of the excess business loss calculation. For a partnership or S corporation, §461(l) applies at the partner or shareholder level, so the entity’s depreciation allocation from a cost segregation study must be combined with that owner’s other trade or business income, gains, deductions, and losses.

When §461(l) disallows the excess business loss for 2026, §461(l)(2) carries the disallowed amount forward as part of the net operating loss, and §172 generally limits a net operating loss arising in a tax year beginning after 2017 to offsetting no more than 80% of taxable income in a later year. That carryforward can still be valuable, but it is not the same as using the whole cost segregation deduction on the 2026 return.

What does placed in service in 2026 mean for this depreciation decision?

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). For a rental, that means ready and available to rent, not the closing date by itself and not necessarily the day the first tenant moves in.

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, while 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, so the same cost segregation timing question is tied to that taxpayer’s own taxable year.

A property bought with tenants in place is usually placed in service at acquisition under Treas. Reg. §1.46-3(d)(1)(ii), because it is already ready and available for its rental function. A property that needs renovation before it can be rented usually is not placed in service under Treas. Reg. §1.46-3(d)(1)(ii) until the renovation leaves it ready and available for that rental function.

Conventions under §168(d) affect regular first-year depreciation after the placed-in-service date is set. Residential rental property with a 27.5-year recovery period under §168 and nonresidential real property with a 39-year recovery period under §168 use the mid-month convention, so a building shell placed in service in any part of a month is treated as placed in service at the middle of that month.

The 5-year, 7-year, and 15-year property a cost segregation study identifies generally uses the half-year convention under §168(d), unless the mid-quarter convention applies under §168(d)(3). The mid-quarter convention applies under §168(d)(3)(A) 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 that test.

For a calendar-year taxpayer, property placed in service (ready and available for its intended use) from October 1 through December 31, 2026 is fourth-quarter property under §168(d)(3), and fourth-quarter property under the mid-quarter convention gets one and a half months of first-year regular depreciation. Bonus depreciation is not reduced by any convention under §168(k), so the mid-quarter convention matters mainly for property on which bonus is not claimed, and the §168(d)(3) test is run by the taxpayer’s advisor on the full placed-in-service schedule rather than assumed.

How does 2026 bonus depreciation affect the §461(l) projection?

Bonus depreciation affects the §461(l) projection when §168(k) allows immediate depreciation on qualified property identified by cost segregation, because the larger 2026 deduction may create or increase an excess business loss. Under §168(k) as amended by OBBBA in 2025, bonus depreciation is 100% for qualified property acquired after January 19, 2025, if the property is otherwise eligible.

IRS Notice 2026-11 ties the acquired date for 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 this purpose means one enforceable under state law that 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).

If a 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, the property is acquired 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 percent 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 remains on the TCJA phase-down at 20% for 2026 under §168(k), except that long-production-period property and certain aircraft under §168(k)(2)(B) and §168(k)(2)(C) run a year behind. Bonus depreciation applies only to qualified property with a recovery period of 20 years or less under §168(k), such as the 5-year, 7-year, and 15-year components a cost segregation study identifies, and it does not apply to land or to the 27.5-year or 39-year building shell.

Used property can qualify for bonus depreciation only if 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 year under §168(k)(7), and that election can matter when §461(l) would defer part of the deduction anyway.

Should I elect out of bonus if §461(l) will defer part of the loss?

An owner whose 2026 projection shows §461(l) deferring part of the cost segregation deduction may consider the class-by-class election out of bonus depreciation under §168(k)(7), weighing that the disallowed amount carries forward as part of a net operating loss, which under §172 generally offsets no more than 80% of taxable income in a later year. Slower depreciation may better match usable deductions to taxable income. This is not a reason to buy or place property in service for a deduction alone, because cost segregation accelerates recovery of the same basis rather than creating new cash.

The election out of bonus is made by class of property for the tax year under §168(k)(7), so the choice is not made component by component within the same class. If the study identifies 5-year personal property, 7-year personal property, and 15-year land improvements, the taxpayer and advisor typically model each class against §469, §465, §461(l), §172, and the owner’s expected future income.

When a prior election out of bonus depreciation was made, section 6.01(1)(c)(vi) of Rev. Proc. 2025-23 does not allow that prior election to be undone through the automatic accounting method change for missed depreciation. For a deeper planning discussion, see cost segregation and electing out of bonus depreciation.

When does §469 apply before §461(l) for rentals and short-term rentals?

Section 469 applies before §461(l) when the activity is a rental activity or another passive activity, because only the loss allowed after §469 can enter the excess business loss calculation. 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.

A short-term rental 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). Either way, the loss is nonpassive only if the owner materially participates under Treas. Reg. §1.469-5T(a), and participation is counted for the tax year and must be real and documented.

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. That release rule can change the year in which a cost segregation deduction becomes usable, but it does not remove the need to test §461(l) when the released loss is treated as nonpassive.

What documents let my advisor project the 2026 excess business loss effect?

Your advisor can project the 2026 §461(l) effect when the cost segregation study, depreciation schedule, and business-income forecast are tied to the same placed-in-service facts. A practical file includes 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.

The cost segregation report should separate land, the 27.5-year or 39-year structure, 15-year land improvements, and shorter-life personal property using a method built on the methodology in the IRS Cost Segregation Audit Techniques Guide. ClickDrag Finance uses that methodology to support the asset classifications your tax advisor then applies on the return.

If you want a quick fit check before investing more time with your advisor, start with the property screen at the ClickDrag cost segregation qualifier. If you are comparing providers, this guide to cost segregation companies can help you evaluate process, documentation, and tax-advisor coordination.

When is cost segregation worth it if §461(l) may defer 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.

For this reader, the second condition includes §461(l), because a deduction can clear §469 and still be deferred as an excess business loss. If the §461(l) projection shows that most of the 2026 cost segregation loss becomes a net operating loss carryforward under §461(l)(2), the study may still be valuable, but the value depends on the expected timing and limits under §172.

A building placed in service in 2026 goes on the 2026 return and needs no Form 3115. A building you placed in service in 2024 or earlier and still own can use Form 3115 with the 2026 return to 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 other eligibility rules in section 6.01 of Rev. Proc. 2025-23 and Rev. Proc. 2015-13 are met.

For a building you placed in service in 2025 with the 2025 return filed and still own at the start of 2026, Form 3115 with the 2026 return or an amended 2025 return filed before the 2026 return is filed are both available under section 6.01 of Rev. Proc. 2025-23 and Rev. Proc. 2015-13, if the other eligibility rules are met. Confirm the route with your tax advisor, because accounting-method eligibility and prior elections can change the answer.

How do recapture and Opportunity Zones affect a large cost segregation deduction?

Recapture affects a large cost segregation deduction when the property is later sold in a taxable sale at a gain, because the character of the gain depends on the property class and depreciation taken. 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.

Under §1245, recapture on 5-year and 7-year property identified by cost segregation is ordinary income to the extent of depreciation taken. Under §1250, recapture of depreciation taken above straight-line, including bonus depreciation, 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 Opportunity Zone owner, depreciation, gain exclusion, and recapture are modeled together because the IRC §1400Z-2(c) election can change the exit result for a qualifying investment held at least 10 years when the qualified opportunity fund interest is sold. For a focused discussion, see Opportunity Zone cost segregation planning.

Frequently Asked Questions

Can cost segregation create an excess business loss in 2026?

Yes, cost segregation can create or increase an excess business loss in 2026 when §168(k) bonus depreciation or accelerated MACRS deductions make trade or business deductions exceed business income and gains plus the §461(l) threshold. The deduction must first pass §469, and for a partner or S corporation shareholder the §461(l) limit is applied at the owner level.

Does real estate professional status avoid the excess business loss limit?

No, real estate professional status under §469(c)(7) does not avoid §461(l) when the rental loss is nonpassive and the taxpayer is not a corporation. Real estate professional status can help the loss pass §469 only when the taxpayer meets both of its tests for the year, each counting only real property trades or businesses in which the taxpayer materially participates, and also materially participates in the rental activity.

Is a disallowed excess business loss carried forward as a net operating loss?

Yes, under §461(l)(2) an excess business loss disallowed for 2026 is treated as part of the taxpayer’s net operating loss carryforward to the next tax year, where §172 generally limits the deduction for a net operating loss arising in a tax year beginning after 2017 to 80% of taxable income. The accelerated depreciation from a cost segregation study is therefore deferred to later years, usable to the extent later years’ taxable income and the §172 limit allow it.

Should I elect out of bonus depreciation if §461(l) limits my 2026 loss?

An owner whose 2026 projection shows §461(l) deferring part of the cost segregation deduction may consider the class-by-class election out of bonus depreciation under §168(k)(7), weighing that the disallowed amount carries forward as part of a net operating loss, which under §172 generally offsets no more than 80% of taxable income in a later year. The election is made by class of property for the tax year, so a tax advisor typically compares bonus, regular MACRS, future §172 limits, and expected hold period before the choice is made.

Does a 2026 cost segregation study require Form 3115?

No, a 2026 cost segregation study does not require Form 3115 when the property is placed in service in 2026 and the study is used on the original 2026 return. Form 3115 and a §481(a) adjustment are relevant when you placed the property in service in an earlier tax year, still owned it at the start of the year of change, and the eligibility rules in section 6.01 of Rev. Proc. 2025-23 and Rev. Proc. 2015-13 are met.

Excess Business Loss Limit and Cost Segregation: Why a 2026 Depreciation Loss May Be Deferred