Short answer
A cost segregation report is not a summary page with a chart. A report that meets the IRS's Audit Techniques Guide contains a sequence of sections that together let a reader, a reviewer and an examiner follow the work from the closing statement to the depreciation schedule: who prepared it, what property and basis it covers, what method was used, what evidence was gathered, how each component was classified and why, what each cost and how that was supported, how the total reconciles, what was assumed and what was left out, and what the adviser needs to apply it. This walkthrough describes each section of a well-built report in order, what it should contain, what to check, and which of the guide's elements it satisfies. It uses no figures from any real study and names no provider. It is general education, not tax advice.
The sections in order
| Section | Contains | Guide element it satisfies |
|---|---|---|
| 1. Cover, transmittal and preparer identification | Property, client, date, the preparer by name with credentials and experience, the reviewer | Preparation by an individual with expertise and experience |
| 2. Scope and purpose | Tax purpose (acquisition, construction, look-back), tax year, what the study does and does not do | Related aspects; limitations |
| 3. Property description | Address, type, size, units, site, systems, date placed in service, use | Documentation |
| 4. Basis and land allocation | Capitalized basis with documents; land separated by fair market value with the evidence | Reconciliation starting point |
| 5. Methodology | Which of the guide's approaches was used and why; records versus estimates | Description of the methodology |
| 6. Documentation and site inspection | Document index with requests and receipts; site visit record; interviews; photographs keyed to assets | Documentation; interviews |
| 7. Legal analysis | The framework for classification and the reason for each contested item | Explanation of the legal analysis |
| 8. Asset list | Each component with description, quantity, unit cost, cost, class, recovery period, placed-in-service date, source (actual or estimate) | Organized asset list; unit costs and take-offs; identification of section 1245 property |
| 9. Indirect cost allocation | Soft costs identified and allocated by a stated method | Treatment of indirect costs |
| 10. Reconciliation | Land plus all classified assets tied to basis; differences explained | Reconciliation to total actual costs |
| 11. Assumptions and limitations | Estimates, judgement calls, scope, what is not addressed | Related aspects |
| 12. Application notes for the adviser | Dates, conventions, bonus eligibility by acquisition date, method-change notes for a look-back | Consideration of related aspects |
| Appendices | Take-off sheets, unit-cost sources, photographs, drawings referenced, document copies | Workpapers examiners request |
Section 1: who stands behind it
The first page names the preparer, with credentials, experience and expertise stated, and the reviewer if there is one. The guide's first element is preparation by an individual with expertise and experience, and its examination chapter tells examiners to request the preparer's qualifications. A report signed only by a firm, or one whose limitations disclaim the individual, fails here before the reader reaches the numbers. Check: a name, a background, a signature.
Section 2: what the study is for
Acquisition, construction or look-back; the tax year; whether the study addresses federal classification only; that it is not tax advice and does not decide the return position. Check: the purpose matches your engagement letter.
Section 3: what the property is
Enough description that a reader who has not seen the building understands what the asset list will contain: type, size, number of units, site features, building systems, age, use, and the placed-in-service date with its evidence. Check: the description matches the property you own, including things like the parking lot and the furnished units, since anything not described here will not be classified later.
Section 4: basis and land
The capitalized basis with its documents: closing statement and settlement costs, or construction cost records with owner soft costs. Then the land allocation by fair market value at purchase, with the appraisal, the contract or the assessor's ratio, and the reasoning. Check: the total matches your records, and the land line has a stated method. Everything below reconciles to this section.
Section 5: how it was done
Which of the guide's approaches was used: detailed engineering from actual cost records, engineering cost estimate from take-offs and documented unit costs, or a combination, and why. If any part is a residual, it says so. Check: the method matches the evidence available; a new building with full records should not be an estimate, and a purchased building with none should not claim actual costs.
Section 6: what evidence was gathered
The document index, listing what was received and what was requested and not received; the site visit record with date and attendees; interviews with the people who know the property; photographs keyed to the asset list. Check: the site visit happened, or the report explains why not; the photographs show the items the asset list claims.
Section 7: why each item is classified as it is
The legal framework, which traces to the investment-credit tests applied under MACRS since Hospital Corporation of America, and the reason for each item where judgement was exercised: function, authority, conclusion. Check: pick three items from the asset list and find their reasons; a report with classes but no reasons has skipped this section.
Section 8: the asset list
The heart of the report. For each component: description in consistent nomenclature, quantity, unit cost with source, extended cost, class and recovery period, placed-in-service date, and whether the cost is actual or estimated. Check: the list ties to the property description; quantities are plausible; estimated items are marked; dates are consistent with section 3.
Section 9: indirect costs
Design fees, permits, general conditions and similar costs identified and allocated across components by a stated method, usually in proportion to direct costs. Check: the method is stated and applied consistently; indirect costs are not all dumped in the building line or all in the short classes.
Section 10: the reconciliation
Land plus every classified asset plus allocated indirect costs equals the capitalized basis from section 4, with any difference explained. Check: it ties, or the difference is disclosed and explained; the building residual, if any, is plausible per square foot.
Section 11: assumptions and limitations
Which costs are estimated; where judgement was exercised; what the study does not address, such as state treatment, passive activity rules and the return position; what documents were unavailable. Check: the limitations match the engagement letter and the evidence section; none of them removes an element the guide expects.
Section 12: notes for the adviser
Placed-in-service and acquisition dates with evidence; conventions; bonus depreciation eligibility by acquisition date; for a look-back, the information needed for the Form 3115 and the section 481(a) computation; state treatment flagged as outside scope. Check: your adviser can carry the asset list into the schedule without calling the practitioner.
Appendices: the workpapers
Take-off sheets, unit-cost sources and dates, photographs, referenced drawings and copies of key documents. The guide tells examiners to request the workpapers; a report whose appendices contain them answers that request from the file.
What a thin report looks like beside this
A thin report has a cover, a summary table of totals by class, a chart, and a page of disclaimers. It may state a methodology in a sentence. It has no asset list with quantities and sources, no legal analysis, no reconciliation and no workpapers. It is a percentage in a binder, which the guide treats as the least reliable approach, and it cannot answer any of the checks above.
What people ask on Reddit and other forums
Owners post report excerpts in the "cost segregation reddit" threads on r/realestateinvesting and ask whether they got what they paid for. The searches that lead people to these threads are usually phrased "cost segregation report example", "what a cost segregation report contains" and "cost segregation report sections".
"My report is twelve pages. Is that enough?" Length is not the test; the sections are. Look for the preparer, the methodology, the asset list with quantities and sources, the legal analysis, the reconciliation and the workpapers.
"There's no asset list, just totals by class." Then there is no study in the guide's sense. Ask for the list; if it does not exist, the totals came from a percentage.
"Can I see a sample before I hire?" Ask for a redacted sample and check it against the sections above. A practitioner confident in the work will show one.
"Which section matters most?" The reconciliation, because it is where errors surface, and the asset list, because it is what the schedule carries forward.
Questions people also ask
What should a cost segregation report include?
The preparer's identification, scope, property description, basis and land allocation, methodology, evidence and site record, legal analysis, an asset list with quantities and sources, indirect cost allocation, reconciliation, assumptions and limitations, notes for the adviser, and the workpapers.
How long is a cost segregation report?
Long enough to contain the sections above with their workpapers. Reports vary with the property; a report without an asset list and a reconciliation is incomplete at any length.
Is a summary table a cost segregation study?
No. A summary shows results; a study shows how they were reached.
What does the IRS want to see in the report?
The elements its guide lists, and the workpapers behind them, which examiners are told to request.
Who should read the report before it is final?
You, your adviser and, ideally, an independent reviewer who did not prepare it.
Sources
- https://www.irs.gov/pub/irs-pdf/p5653.pdf — IRS Publication 5653, Cost Segregation Audit Techniques Guide (Rev. 2-2025): Chapter 3, methodologies; Chapter 4, principal elements; Chapter 5, examination.
- https://www.irs.gov/publications/p551 — IRS Publication 551 (Rev. December 2024), Basis of Assets.
- https://www.irs.gov/publications/p946 — IRS Publication 946 (2025), How To Depreciate Property: Chapters 1 and 4.
- https://www.leagle.com/decision/1997130109btc211129 — Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997).
- https://www.irs.gov/instructions/i3115 — Instructions for Form 3115, Application for Change in Accounting Method.
Related reading
- How to read a cost segregation report's limitations
- The evidence a cost segregation study needs
- How reconciliation reveals errors
- How the IRS examines a cost segregation study
- Cost segregation glossary: 60 terms defined
- What Reddit asks about cost segregation, answered with sources
- Find a practitioner in the NBCSS directory