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Green Flags and Red Flags: How to Choose a Cost Segregation Firm

by PracticeCFO | April 28, 2026
A person in a suit uses a calculator on a table with charts, a smartphone, and a tablet; conveying a business and analytical setting.

Not all cost segregation firms are equal. In fact, a low-quality study can expose you to more IRS scrutiny than no study at all. In Episode 152 of The Dental Boardroom, Wes Read walks through exactly what separates a qualified firm from a risky one and what to look for before you write the check.

Why This Matters

The cost segregation space attracted bad actors during the ERC boom, and the same dynamic exists here. Wherever there is a large, legal tax benefit, there will be firms that oversell, under-deliver, and leave you holding the liability when the IRS comes knocking. The study itself is just a document. What matters is whether it is defensible.

Green Flags

  • Licensed engineer on staff who conducts a physical site inspection. A cost segregation study that is performed without an engineer visiting the property is not a real cost segregation study. The IRS Cost Segregation Audit Technique Guide requires an engineering analysis. If the firm cannot show you that a licensed engineer physically inspected your building, walk away.
  • Explicit reference to the IRS Cost Segregation Audit Technique Guide. A qualified firm knows this document, follows it, and references it in their work. It is the standard the IRS uses to evaluate these studies. If a firm does not know what it is or cannot tell you how its work aligns with it, that is a problem.
  • Explicit written audit support policy. A reputable firm stands behind its work. They will commit in writing to defending the study if the IRS challenges it. Get this in writing before you engage them.
  • Flat fee structure. You want to pay a fixed, known amount for the study — typically between $10,000 and $25,000 for a dental office. Contingency-based pricing, where the firm takes a percentage of your tax savings, creates a conflict of interest that incentivizes them to push your classification percentages beyond what is defensible.
  • Specific experience with dental office properties. Dental build-outs have unique characteristics plumbing for multiple operatories, specialized HVAC, dental-specific cabinetry, and equipment infrastructure. A firm with dental experience will classify these correctly. One without it may miss significant deductions or classify assets incorrectly.

Red Flags

  • No engineers on staff, and the study was done entirely by a CPA. Your general CPA is not qualified to perform a cost segregation study. This is an engineering analysis, not an accounting one. CPAs can review and apply the results, but they should not generate the asset classifications.
  • Desktop or modeled study with no physical inspection. If no one visited your building, the study is not defensible. The IRS will disallow it under audit.
  • Contingency-based pricing. This is the single biggest red flag. When a firm's fee is tied to your tax savings, they are incentivized to be aggressive in ways that benefit them at your expense.
  • Refusing to provide written audit support, or committing only to defend at a low confidence threshold. Any firm worth hiring will stand behind its work unconditionally.
  • Unusually high reclassification promises before inspecting the property. If a firm tells you they can reclassify 60 or 70 percent of your building's purchase price into accelerated categories before they have even seen the property, they are either guessing or telling you what you want to hear. Both are dangerous.
  • Your general CPA is doing the study without a specialist. Well-intentioned CPAs sometimes take on cost segregation work they are not equipped to do. The result is a study that may not withstand scrutiny.

The IRS has specific audit guidelines for cost segregation, and a quality firm will proactively reference them. Do multiple interviews. Ask to see sample reports. Ask who the licensed engineer is and whether they will visit your specific property. Ask what their audit support policy is in writing.

The cost of a quality study is modest relative to the tax benefit it generates. Do not shop for the cheapest option. Shop for the most defensible one.

Listen to Episode 152 of The Dental Boardroom Podcast: https://podcasts.apple.com/us/podcast/152-cost-segregation-tax-strategy-for-dentists-part-4/id1518344747?i=1000761993737

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