A cost segregation study classifies supported property costs into the appropriate depreciation categories. Land is not depreciable, and the purchase allocation needs support before components are analyzed. Ask how the study connects to closing records, asset descriptions and the placed-in-service date. A marketing estimate is not a substitute for a completed study and a return-level model.
Compare depreciation timing with the owner's limitations
A property may generate accelerated deductions while its owner has no immediate ability to use the resulting loss. Entity basis, at-risk rules, passive activity rules and the excess business loss limit can affect the result. The depreciation model should therefore feed a second schedule showing allowed losses, suspended amounts and carryforwards. Also forecast the disposition: accelerated deductions can change adjusted basis and the character or amount of later taxable gain.
Worked planning example
Assume a rental has $45,000 of income before depreciation and a supported depreciation computation produces $180,000 of deductions. The preliminary tax loss is $135,000. If the applicable passive activity rules suspend the full loss, the current benefit from that loss is not $135,000 multiplied by a marginal tax rate. Compare the actual carryforward outcome with the study cost, future income and planned sale. The example assumes the depreciation calculation is valid without specifying an accelerated depreciation percentage.
Records to bring to the review
- Reconcile closing costs, land and depreciable basis.
- Retain study support and asset classifications.
- Model all owner-level loss limits.
- Compare current benefit, carryforward and sale effects.
Does cost segregation guarantee a W-2 offset?
No. The owner must satisfy the applicable participation and loss rules, and other limits may still restrict the deduction.
Read this alongside the AE book and published cases
This companion guide provides additional education for readers of Real Estate Investor Tax Playbook. It is not a quotation or chapter excerpt. The worked example is hypothetical and should not be confused with a reported AE client outcome.
Use the AE Tax Advisors rental commercial property case-study collection to compare the assumptions and supporting records behind published reports. Reported results are publisher statements, not independently audited results or a prediction for another taxpayer. The case-study methodology explains those limits.
Primary source and next reading
IRS guidance for this topic. IRS publications can cover earlier return years; check applicable current-year instructions, law and state treatment before implementation.
Read the complete companion reading sequence or browse the existing learning library. For the broader loss framework, read how the 2026 excess business loss limitation works.
General federal tax education. Actual outcomes require complete facts, applicable law and a taxpayer-specific review. A deduction amount is not the same as tax saved or cash available.
Discuss your planning facts with AE Tax Advisors
Bring the records identified in this guide to a discovery conversation with AE Tax Advisors. Start with the decision you need to make, the year affected and the assumptions that need verification.