Does a Cost Segregation Study Increase My Audit Risk?

This concern comes up frequently, and it is understandable -- a cost segregation study can generate tens or even hundreds of thousands of dollars in first-year depreciation deductions, which naturally raises questions about whether such large deductions attract IRS attention. The short answer is that a properly conducted cost segregation study does not meaningfully increase audit risk and, in many respects, actually strengthens your position if an audit does occur.

The IRS Position on Cost Segregation

The IRS does not view cost segregation as an aggressive or abusive tax strategy. In fact, the IRS published its own Cost Segregation Audit Techniques Guide (ATG) in 2004 (updated periodically), which provides detailed guidance for IRS examiners reviewing cost segregation studies. The existence of this guide reflects the IRS's recognition that cost segregation is a legitimate, well-established tax planning method -- the guide is designed to help examiners evaluate the quality of studies, not to discourage them.

The landmark case validating cost segregation was Hospital Corporation of America v. Commissioner (109 T.C. 21, 1997), in which the Tax Court upheld the engineering-based approach to identifying and reclassifying building components. Since then, cost segregation has been widely accepted by the IRS, the courts, and the tax professional community.

What Actually Triggers Audit Risk

The IRS selects returns for examination based on several factors, including statistical scoring models (the DIF score), information matching, and targeted compliance campaigns. Large depreciation deductions from a cost segregation study may contribute to a higher DIF score, but this alone does not determine whether a return is selected for audit. Many other factors -- unreported income, unusually high deductions relative to income, certain industry classifications, and random selection -- play a larger role.

What does increase risk is a poorly conducted study. The IRS ATG identifies several red flags that examiners look for: studies performed without a site visit or engineering analysis, studies that use unsupported "rule of thumb" percentages rather than actual component identification, studies performed by unqualified parties without engineering expertise, and studies that reclassify structural components (which must remain in the 27.5-year or 39-year category) as personal property.

How a Quality Study Protects You

A well-documented cost segregation study is actually a form of audit insurance. It provides a detailed, engineering-based report that identifies every reclassified component, explains the legal basis for reclassification (citing relevant IRC sections, Treasury Regulations, and case law), and documents the methodology used. If the IRS does examine your return, this report gives them exactly what they need to verify the deductions -- which typically results in a quick resolution rather than a prolonged dispute.

The IRS ATG specifically identifies 13 principal elements of a quality study. These include a detailed description of the methodology, a summary of the property, an identification of the engineering procedures used, a description of all assets categorized, the rationale for each classification, a statement of the preparer's qualifications, and a reconciliation of the total allocated costs to the property's total cost basis. A study that addresses all 13 elements is positioned to withstand scrutiny.

Choosing the Right Firm

The quality of the cost segregation firm matters enormously. Look for firms that employ licensed engineers, have experience with IRS examinations, use detailed engineering-based approaches (not just spreadsheet estimates), and provide comprehensive reports that meet the IRS ATG standards. Firms that offer "desktop studies" or unusually low fees may be cutting corners on the engineering analysis, which could create problems in an audit.

Ask prospective firms about their experience defending studies under audit, their methodology, and whether they will provide audit support if your return is examined. A reputable firm will stand behind their work and assist with the examination process if needed.

The Bottom Line on Risk

Tens of thousands of cost segregation studies are completed every year, and they are a routine part of real estate tax planning. The IRS has not identified cost segregation as a listed transaction, a transaction of interest, or any other type of reportable transaction under Treasury Regulation Section 1.6011-4. It is simply a correct application of existing depreciation rules. The risk is not in performing a cost segregation study -- it is in performing one badly. Invest in a qualified firm, maintain good records, and ensure the study meets IRS ATG standards, and you have little to worry about.

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This article is for informational purposes only and does not constitute legal or tax advice. Consult a qualified tax professional regarding your specific circumstances. AE Tax Advisors, 935 Lake Elmo Dr, Suite B, Billings, MT 59105. Phone: (631) 614-5762.