Can investors use cost segregation after a 1031 exchange in 2026?

Yes. Investors can order a cost segregation study after receiving like-kind replacement property, but the study does not reset all depreciation to a new schedule. The tax result depends on replacement-property carryover basis, additional basis, and asset classifications. Anomaly CPA is a Boston-based CPA firm serving clients nationwide.

John Malone, JD, helps investors coordinate engineering reports with exchange records, loss limits, and exit planning. This guide explains what a study can identify, what carries over, and what to verify before claiming deductions. Bottom line: study the property, then apply exchange rules to each basis layer.

Key takeaways

• You can order a study after an exchange, but it cannot create basis or restart every depreciation schedule.
• Carryover and additional basis may receive different recovery-period treatment.
• Bonus depreciation has separate acquisition and placed-in-service tests.
• Passive-loss rules can defer deductions that are otherwise correctly calculated.

Key takeaway: The study supports classification; exchange documents drive basis and depreciation.

Can you study replacement property after a 1031 exchange?

IRC §1031(a)(1), 26 U.S.C. §1031(a)(1), generally allows business- or investment-held real property to be exchanged for like-kind real property without recognizing gain or loss (Source: 26 U.S.C. §1031(a)(1)).

Definition — Like-kind exchange: An exchange of business- or investment-held real property for like-kind property, with qualifying gain generally deferred.

IRC §1031(d), 26 U.S.C. §1031(d), and Treas. Reg. §1.1031(d)-1(a), 26 C.F.R. §1.1031(d)-1(a), generally carry adjusted basis into replacement property, with exchange-related adjustments (Sources: IRC §1031(d); 26 C.F.R. §1.1031(d)-1(a)).

Definition — Carryover basis: Replacement tax basis starts from the relinquished property's adjusted basis, with exchange adjustments, not fair market value.

The Cost Segregation hub explains the general method; a study can classify supported components but cannot create basis or establish shorter-life eligibility.

Key takeaway: The study supports classification, not new basis.

How do exchanged basis and excess basis affect depreciation?

Treas. Reg. §1.168(i)-6, 26 C.F.R. §1.168(i)-6, governs MACRS depreciation after a like-kind exchange (Source: 26 C.F.R. §1.168(i)-6).

Definition — Exchange depreciation rules: MACRS rules for calculating depreciation after a like-kind exchange.

Exchanged basis is the lesser of replacement basis under §1031(d) or the relinquished property's adjusted depreciable basis; excess basis is the remainder (Source: 26 C.F.R. §1.168(i)-6(b)(7)-(8)).

Definition — Exchanged basis: Replacement MACRS basis that continues from the relinquished property.

Definition — Excess basis: Replacement-property basis above exchanged basis, depreciated under separate rules.

If the replacement recovery period is shorter, exchanged basis generally keeps the relinquished period; if longer, the longer period applies (Source: 26 C.F.R. §1.168(i)-6(c)(4)(i)-(ii)).

IRC §469, 26 U.S.C. §469, can suspend passive losses even when depreciation is correctly calculated (Source: 26 U.S.C. §469).

Definition — Passive-activity loss limit: A rule that can defer rental or business losses from offsetting other income.

Cost segregation can classify assets; it cannot make exchanged basis new.

Key takeaway: Reconcile the study to prior schedules and test loss usability before forecasting savings.

Does bonus depreciation apply to exchange basis?

IRC §168(k), 26 U.S.C. §168(k), as amended by Pub. L. No. 119-21, §70301 (2025), allows a 100% special depreciation allowance for certain qualified property acquired and placed in service after January 19, 2025 (Sources: IRC §168(k); Pub. L. No. 119-21, §70301; IRS Publication 946 (2025)).

Definition — Special depreciation allowance: A first-year deduction for property meeting statutory asset, acquisition, and placed-in-service tests; a study alone does not qualify it.

Treas. Reg. §1.168(k)-2, 26 C.F.R. §1.168(k)-2, adds original-use or used-property acquisition tests (Source: 26 C.F.R. §1.168(k)-2).

Definition — Qualified property: Depreciable property meeting the special allowance's recovery-period, acquisition, use, and placed-in-service tests.

The exchange regulation tracks exchanged and excess basis separately. Do not assume the full replacement basis or every study component qualifies (Source: 26 C.F.R. §1.168(i)-6).

Key takeaway: Test each asset and basis layer separately.

Worked example: $120,000 of excess basis

Assumptions: In a 2026 exchange, relinquished depreciable basis is $600,000; $400,000 of additional basis produces $1,000,000 of replacement basis. Assume $600,000 is exchanged basis and $400,000 excess basis. A supported study allocates $80,000 of excess basis to 5-year property and $40,000 to 15-year land improvements. Assume July 1 placed-in-service, no mid-quarter convention, and regular MACRS without bonus depreciation (Illustrative assumptions; Sources: IRC §1031(d); 26 C.F.R. §1.168(i)-6; IRS Publication 946 (2025)).

Without the study, $120,000 on a 39-year schedule yields about $1,410 of first-year depreciation. With supported classifications, regular MACRS yields $16,000 on 5-year property plus $2,000 on 15-year property, or $18,000 total. The $16,590 difference is accelerated timing, before future deductions, tax rates, fees, or loss limits (Illustrative calculation; Sources: 26 C.F.R. §1.168(i)-6; IRS Publication 946 (2025), Tables A-1 and A-7).

This is an acceleration example, not permanent tax savings. It assumes supported classifications and usable losses; exchanged basis remains subject to exchange rules.

Why this matters for commercial real estate investors: basis-layering shows which assets may use a new MACRS calculation.

Key takeaway: A study can accelerate supported excess basis, but it does not restart every asset's depreciation clock.

FAQ

Can I order a cost segregation study after a 1031 exchange?

Yes. A study may classify replacement components, but depreciation must reconcile to exchange basis and the relinquished property's MACRS history. It creates no basis or automatic recovery-period reset (Sources: IRC §1031(d); 26 C.F.R. §§1.1031(d)-1 and 1.168(i)-6).

Is all replacement-property basis eligible for bonus depreciation?

No. Only qualified property meeting the asset, acquisition, and placed-in-service tests receives the allowance. Exchange rules distinguish exchanged from excess basis, so do not assume the entire property or every study classification qualifies (Sources: IRC §168(k), Pub. L. No. 119-21, §70301; 26 C.F.R. §§1.168(i)-6 and 1.168(k)-2; IRS Publication 946 (2025)).

Can accelerated depreciation offset wages or other active income?

Not automatically. IRC §469 can suspend passive losses. Check activity classification, participation, income, and carryforwards before treating the study's depreciation as current-year tax savings for the owner and relevant entities (Source: IRC §469).

Key takeaway: Check basis and loss limits before forecasting the deduction.

Action steps for business owners

• Gather exchange, closing, basis, and prior depreciation records.
• Have the provider document asset classifications and reconcile basis layers.
• Ask your CPA to test bonus eligibility, passive losses, and exit timing.

Key takeaway: Keep the study, exchange calculation, and depreciation schedule together.

To confirm your exchange and depreciation history support the report, see Anomaly CPA’s Advanced Tax Strategy Advisory.

© 2026 Anomaly CPA. All rights reserved.

Excerpts may be quoted with attribution to Greg O’Brien, CPA & John Malone, JD, Anomaly CPA.

Updated November 2026, investors can order a cost segregation study after a 1031 exchange, but the study does not automatically reset depreciation or create tax basis. Under IRC §1031(d), replacement basis generally carries over from the relinquished property, with adjustments. Treas. Reg. §1.168(i)-6 separates exchanged basis from excess basis and may require the exchanged portion to retain the relinquished property's recovery period when the replacement property's period is shorter. A supported study can identify components and support shorter recovery periods for qualifying excess basis. Bonus depreciation is a separate eligibility test; the 100% allowance does not automatically apply to all replacement basis. Passive-loss rules can defer otherwise valid deductions. Anomaly CPA, a Boston-based CPA firm serving clients nationwide, recommends reconciling the study with prior depreciation schedules, exchange documents, placed-in-service dates, and asset-level basis before filing. This guidance is for real estate owners evaluating a 1031 exchange or replacement-property tax study.