Cost segregation companies fall into three main groups: specialty engineering firms, CPA or tax advisory firms (with in-house or partner engineers), and online software platforms. Engineering firms offer the most detail and audit support. Software is cheapest but thinnest. CPA firms combine the study with tax planning. The right choice depends on property size, budget, and how much audit protection you want.
This content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.
The three main types of providers
1. Specialty engineering firms
These companies focus mainly on cost segregation and related specialty tax work. Their teams usually include engineers and construction cost estimators. Many work nationwide and handle thousands of studies.
- Strengths: Detailed reports, site visits, deep experience with many property types, audit support
- Watch for: Higher fees for small properties, less involvement in your overall tax plan
2. CPA and tax advisory firms
Some accounting firms have in-house cost segregation teams. Others partner with engineering firms and manage the process for you.
- Strengths: The study is built around your full tax picture, including passive loss rules, REPS, and state taxes
- Watch for: Make sure qualified engineers or cost experts actually prepare the study
3. Online and software-based providers
These platforms use your property details, photos, and cost databases to produce a report quickly, often at a lower price.
- Strengths: Low cost, fast turnaround, convenient for small rentals
- Watch for: Less detail, limited or no site visit, and potentially weaker support in an audit
Side-by-side comparison
| Factor | Engineering firm | CPA firm | Software platform |
|---|---|---|---|
| Typical fee | Moderate to high | Moderate to high | Low |
| Site visit | Usually | Varies | Rarely |
| Report detail | High | Medium to high | Low to medium |
| Tax planning integration | Limited | Strong | Limited |
| Audit support | Often included | Often available | Varies |
| Best fit | Mid-size to large commercial, multifamily | Investors wanting one advisor for strategy | Small single-family or STR with modest basis |
Which type is right for you?
- Building value over $1 million? An engineering-based firm or a CPA firm with engineers is usually worth the higher fee.
- Small rental under $500,000? A lighter study or software option may be reasonable, as long as you understand the audit tradeoff.
- Complicated tax picture? If you're claiming REPS, running STRs, or planning a 1031 exchange, a CPA-led approach helps tie it all together.
- Many properties? Ask about portfolio pricing.
What every good company has in common
No matter the type, a quality provider should:
- Name the people who prepared the study and list their credentials
- Explain the method and cost sources
- Reconcile the allocations to your actual cost basis
- Charge a flat, clearly scoped fee
- Coordinate with your CPA
Frequently asked questions
Are online cost segregation studies legitimate?
Do big firms always do better studies?
Can I switch providers for a later property?
See what your property may qualify for
Run our 2-minute STR Qualification Quiz or model your Low / Mid / High cost segregation range.
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Read guideThis content is not tax or financial advice for you. Please talk with a CPA to find what's right for your situation.