Study Reports Explained
What a cost segregation report usually contains, section by section, based on the elements the IRS audit guide lists for a quality report. The asset schedule is what your CPA posts. The narrative and exhibits are what support it. The guide is not a required format and is not legal authority.
Educational information, not tax advice.
Updated 2026-10-14
Key takeaways
- The IRS audit guide lists nine elements of a quality report.
- The asset schedule is what your CPA uses; the narrative and exhibits are what support it.
- Assumptions and limiting conditions tell you what the report relied on.
- The same chapter lists thirteen elements of a quality study, including legal analysis and reconciliation.
- The guide is not a required format and cannot be cited as legal authority.
Chapter 4 of the IRS Cost Segregation Audit Techniques Guide lists principal elements of a quality report: a summary letter or executive summary, a narrative report, a schedule of assets, a schedule of direct and indirect costs, a schedule of property units and costs, engineering procedures, a statement of assumptions and limiting conditions, a certification, and exhibits.
The same chapter lists thirteen elements of a quality study, including a detailed description of methodology, use of appropriate documentation, a common nomenclature, an explanation of the legal analysis, reconciliation to actual costs, and identification of §1245 property.
The Service has not established a required report format. Those lists are what examiners are told to look for. They do not create an “IRS-approved” report, and no study should be marketed that way.
A report that has a schedule but no legal reasoning, or a narrative but no reconciliation, is missing the pieces the guide says every study should always include: class assignments, a cited rationale for §1245 versus §1250, and costs that add back to actual basis.
Educational information, not tax advice. Your CPA decides what is posted to the return. The report is support, not a filed form.
Read the report in that order: assumptions first, then the reconciliation, then the legal analysis, then the schedule. A schedule that looks precise is only as good as the land value, the date, and the missing-document notes that sit in front of it.
Reading the asset schedule
The schedule lists each component or group, its cost, its recovery period and method, and often its Rev. Proc. 87-56 asset class. Totals by class should add back to the depreciable basis. Each line should be traceable to the narrative's reasoning.
Groupings should use a common nomenclature and, where used, a standard numbering system such as CSI MasterFormat. Creative labels — the guide’s example is sewage piping called process piping — are a warning sign.
The schedule is also what depreciation software needs. If class, method, convention, and placed-in-service date are missing, the CPA cannot post the study without guessing.
The legal analysis
A quality report explains why components are §1245 or §1250, citing the regulations and cases it relied on. Vague labels — the guide's example is sewage piping called process piping — are a warning sign.
Citations should match the facts. Hospital Corporation of America supports the legal test, not every hospital fixture in another building. An industry matrix should be named as examiner guidance for that industry, not as a statute.
Bonus percentages, if discussed, need as-of dates. As of October 16, 2026, 100% additional first-year depreciation applies to qualified property acquired after January 19, 2025. A report that still recites the old phase-down as the only current rate is out of date for post-cutoff property.
Assumptions
Assumptions can include the placed-in-service date, land value, the scope of the inspection, and any missing documents. If an assumption changes, the classifications or costs relying on it may change too.
Limiting conditions should say what the preparer did not see and what records were unavailable. Those limits belong in the same section as the certification, so a reader can judge the work.
A certification is one of the nine report elements. What it can honestly say depends on who prepared the study and what they reviewed. This library does not claim an operational engineer-certification step.
Cost schedules and exhibits
Direct- and indirect-cost schedules show how contractor costs and soft costs were allocated. The property-unit schedule shows the take-off quantities behind the dollars.
Exhibits typically include source documents, the reconciliation to basis, and photographs. Those are the pieces an examiner is told to compare to AIA pay records and to the site. If an exhibit is missing, the assumptions section should say what was used instead. A certification that “all documents were reviewed” is not a substitute for listing them.
How the thirteen study elements map to the report
Methodology, documentation, interviews, nomenclature, numbering, legal analysis, take-off, asset lists, reconciliation, indirect-cost treatment, identification of §1245 property, and related aspects such as §263A and method changes are the study elements behind the report sections.
A reader who cannot find those topics in the narrative or exhibits is looking at a schedule without a study. The guide treats that gap as a quality problem, not as a different valid format. The nine report elements and the thirteen study elements are checklists for examiners. They are not a certification stamp, and they do not make any vendor’s template “IRS-approved.”
Sources
- 1IRS Publication 5653 — Cost Segregation Audit Techniques Guide (rev. 2-2025)(opens in a new tab)
Written for IRS examiners. The guide states it is not an official pronouncement of law and cannot be cited as authority. It predates the July 2025 law.
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