Publication 5653, the Cost Segregation Audit Techniques Guide (ATG), is the IRS’s internal training document for revenue agents who examine returns relying on cost segregation studies. It is not regulation and it does not bind the courts; it is the operational standard the Service applies in deciding whether a study’s component reclassifications are defensible.
The ATG was first issued in 2004, consolidating IRS experience after Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997), established the modern §1245-vs-§1250 framework within a building. It has been periodically updated as the Service expanded the industry-specific chapters and revised the methodology hierarchy. Pub. 5653 is the document an examiner pulls up when assessing a study; consequently, it is the document every defensible study cites.
What it says
”There are 13 principal elements of a quality cost segregation study and report. These include preparation by an individual with expertise and experience, detailed engineering description of the methodology used, preparation of the report and exhibits, and a statement of assumptions and limiting conditions.”
The 13 elements enumerated in Chapter 4 are the operational checklist examiners apply. A study lacking any of them — engineering description, methodology disclosure, photographic documentation of components, source citations for cost data — is open to challenge. A study that contains all 13 is presumed reasonable absent independent evidence of error.
”Six commonly used methods are: 1) detailed engineering approach from actual cost records, 2) detailed engineering cost estimate, 3) survey or letter, 4) residual estimation, 5) sampling or modeling, and 6) ‘rule of thumb.’ The detailed engineering approach from actual cost records is the most methodical and accurate approach.”
The hierarchy is consequential. A study using the detailed-engineering approach from actual cost records is the IRS’s preferred methodology; a study relying on rule-of-thumb percentages is the least preferred. Cost segregation studies issued on existing acquired properties (where actual construction cost records do not exist) typically use the detailed-engineering-estimate methodology — the second-most preferred — by reconstructing component cost using RSMeans construction-cost data and site documentation.
How it operates
The ATG is organized in two parts. Part I sets out the general framework — what cost segregation is, the legal authority anchored in MACRS and HCA, the methodologies, the documentation requirements, the §1245-vs-§1250 distinction, and a discussion of the most common examiner findings. Part II contains industry-specific chapters — auto dealers, restaurants, hotels and motels, retail trade, casinos, light manufacturing, biotech and pharma, and others — each enumerating the components commonly identified in studies of properties in that industry and the recovery periods the Service has historically accepted.
An IRS examiner reviewing a cost segregation study reads Pub. 5653 in this order: confirm the 13 quality elements (Chapter 4), assess the methodology against the hierarchy (Chapter 3), open the relevant industry chapter for component-specific guidance, and flag any classification that diverges from the chapter’s examples without specific justification in the study.
Cross-references
- Cost segregation topic hub (practitioner-facing framework)
- MACRS topic hub (the underlying classification system)
- IRC §168 (statutory authority)
- Editorial methodology (how this reference is maintained)
- Recapture topic hub (the §1245 exposure cost-seg components create on disposition)
Sources
- IRS PDF: www.irs.gov/pub/irs-pdf/p5653.pdf
- Foundational case: Hospital Corporation of America v. Commissioner, 109 T.C. 21 (1997)
- Companion publication: Pub. 946 (How to Depreciate Property)
- Statutory backbone: 26 U.S.C. § 168 and § 1245