Cost Segregation: 5 Questions to Ask Before You Say Yes To A Study

5 questions to ask before saying yes to a cost segregation study

If you are involved in real estate and property investments, then you have probably heard the term “Cost Segregation” being used as a tax strategy to take advantage of earlier tax deductions. 

Cost Segregation is a legitimate and well-established tax strategy, but like any service that promises significant financial results, it’s worth doing your homework before you engage a provider.

Whether it’s with your CPA or a dedicated Cost Segregation provider, here are five questions you should be asking before agreeing to a Study.

1. Will you conduct a physical on-site inspection?

This is the first and most important question. A legitimate Cost Segregation Study requires a qualified professional to visit the property in person. Viewing plans remotely, conducting a virtual walkthrough, or simply relying on photos are not signs of a quality Study.

The IRS sets forth strict guidelines for how a properly conducted study should be prepared, and a physical site inspection is foundational to meeting those standards. In an era of AI tools and remote technology, it might seem like a site visit is optional, but it isn’t. 

If the person preparing your study has never set foot in your building, the study’s conclusions rest on assumptions rather than direct observation, and these assumptions won’t hold up well in an audit.

2. What makes your Study audit-defensible?

“Audit-defensible” is a term that gets used loosely in this industry, so it’s worth asking what a provider actually means by it.

A genuinely audit-defensible Cost Segregation Study is supported by a thorough methodology, detailed documentation, and a clear connection between the property’s components and their assigned tax classifications. 

If an IRS examiner were to review the study, they should be able to follow the logic: understand what was inspected, how each component was classified, and why that classification is appropriate under the relevant tax code.

If a provider can’t explain their methodology clearly, that’s worth taking seriously.

A quick side note: “Audit-defensible” is not the same as “audit-proof.” No firm can guarantee that a Cost Segregation Study is safe from being audited, but it can guarantee that it can defend the Study.

3. What will the final report include?

The report is the main deliverable from the Study, and not all reports provide the same level of detail or usefulness.

A quality Cost Segregation report should clearly document several key things, including:

  • How the property’s costs were analyzed, classified, and allocated. 
  • A detailed breakdown of every depreciable component identified and the recovery period assigned to each
  • The methodology used to determine MACRS classifications
  • Supporting documentation for your CPA to understand and apply the conclusions accurately. 

That level of detail matters beyond the first year. Your CPA will need organized, component-level records to handle depreciation correctly going forward, manage any partial dispositions, and support the study’s positions if a question arises later.

A report that gives you a summary number without the supporting work behind it isn’t doing its full job.

4. How long will the Study take to complete?

Timelines vary based on property size and complexity, but a well-run Cost Segregation Study typically takes six to eight weeks from the on-site inspection to final report delivery.

Knowing the timeline upfront matters for planning purposes, particularly if your CPA has filing deadlines to coordinate around. Having a clear window before the work begins keeps you and your CPA informed throughout the process.

5. How do I know if my investment will actually benefit from a study?

This is the most important question, and the honest answer is: it depends.

The value of a Cost Segregation Study is shaped by several factors, such as the property’s cost basis, the types of components and improvements present, when the property was placed in service, and your individual tax situation. 

In other words, there is no universal formula or one-size-fits-all answer. A property that generates significant benefits for one owner may not generate meaningful results for another, even if the buildings look similar on paper.

This is why the decision to commission a Study should begin with an honest assessment, not a sales pitch. Any provider willing to tell you upfront whether a Study is likely to benefit your specific situation, or willing to tell you if it isn’t, is one worth considering further.


At McClarigan CPAs & Advisors, every engagement starts with exactly that kind of Cost Segregation Discovery Assessment. 

Before any agreement is signed, our team evaluates your property and gives you a straightforward answer on whether a Cost Segregation Study makes sense for your situation. 

If it does, the study is conducted with a physical on-site inspection, engineering-based analysis aligned with the IRS Audit Techniques Guide, and a final report delivered within six weeks. If it doesn’t, we let you know that before you spend a dollar.

Don’t let the unknowns of Cost Segregation keep you from seeing if it’s right for your situation. Contact us to start your Discovery Assessment!