Real estate tax education
Cost segregation for rental property
Cost segregation identifies and supports the tax classification of property costs. Some assets may have shorter recovery periods than a building, changing deduction timing—not guaranteeing a tax saving.
Sources checked November 2, 2026. IRS publications linked below may cover earlier tax years; verify current-year guidance before filing.
What does a cost segregation study do?
A study allocates supported costs among asset categories under the applicable tax rules. Certain personal property and land improvements may have shorter recovery periods than structural building components. Whether an item qualifies depends on its function, applicable law and facts—not its label in a report.
What documentation matters?
Maintain acquisition and construction records, itemized costs, asset descriptions, photographs or plans as relevant, and a study explaining classification and allocation methods. Unsupported estimates or a promised percentage of savings are not substitutes for evidence.
An illustrative timing comparison
Assume a study supports classifying $20,000 of costs as a qualifying shorter-life asset rather than residential building cost. The applicable depreciation schedule may recover that $20,000 sooner. This does not mean $20,000 of tax savings: usable deductions, tax rates, elections, loss limits and later disposition consequences still matter. This example does not assume bonus depreciation eligibility.
Does 100% bonus depreciation apply?
IRS guidance describes restored 100% additional first-year depreciation for eligible property acquired and placed in service after January 19, 2025, subject to statutory requirements and elections. Acquisition timing, contracts and asset eligibility matter. A residential rental building itself does not become eligible for immediate expensing merely because a cost segregation study is prepared.
Check the current version of IRC §168, IRS Publication 946 and later guidance for the relevant year. Do not apply an old phase-down percentage or a blanket 100% assumption to every component.
Consider costs, loss limits and disposition
Compare study fees and compliance work with deduction timing and your ability to use losses. Faster depreciation can reduce later deductions and affect basis, recapture and sale or exchange planning. State treatment may differ from federal treatment. Reclassifying prior-year assets may require accounting-method procedures; do not simply amend depreciation without checking the applicable rules.
Frequently asked questions
- Does cost segregation guarantee savings?
- No. It can change depreciation timing, but usable deductions and total tax effects depend on the taxpayer and property.
- Can the entire building be written off immediately?
- Not merely because a study is performed. Building and component classifications and bonus depreciation eligibility must be established separately.
- Is the IRS audit guide tax law?
- No. The Cost Segregation Audit Technique Guide is examiner guidance, not an official pronouncement of law or an authority taxpayers may rely on as such.
Primary sources and IRS guidance
Considering a 1031 exchange?
Request a personal 1031 consultation with , or start with your preliminary deadlines.
General U.S. federal tax education, not individualized tax, legal or investment advice. Examples use stated assumptions and do not promise deductions or savings. A consultation requires separate agreement; submitting a request does not establish a CPA-client relationship.