What types of cost segregation providers exist?

There are four types: (1) technology-enabled platforms with licensed engineer review and signature ($1,200-$12,000 set by property class and building size, 1-3 week turnaround), (2) Traditional engineering firms ($5,000-$15,000+ for residential and standard commercial, higher on complex assets, 6-12 weeks), (3) CPA desk studies ($1,500-$4,000, 2-4 weeks), and (4) DIY software with no engineer and no signature (published from about $495, instant). The first two are engineering-based and IRS-defensible. CPA desk studies and DIY software are not.

Which cost segregation provider is best for a rental property under $1 million?

For properties under $1 million, AI-powered platforms with engineering partners offer the best value. They deliver the same engineering methodology as traditional firms, with a licensed engineer signing the study, and price it on the work required rather than on the property's value. That keeps a study economic on properties as small as $300,000 in depreciable basis. Traditional firms are typically not cost-effective below $500,000-$750,000 in property value.

When should I choose a traditional engineering firm over an AI-powered provider?

Traditional firms are the best choice for properties over $10 million, highly specialized buildings (hospitals, manufacturing, data centers), situations where institutional partners require on-site documentation, and complex properties with unusual construction or unique building systems.

Choosing a Cost Segregation Provider: AI-Powered vs Engineering Firms vs DIY

The best cost segregation provider depends on your property size, budget, complexity, and risk tolerance. A $400,000 rental duplex has different needs than a $15 million hotel. Having worked across the full spectrum of the industry, from technology-enabled platforms to traditional engineering firms, I can provide an honest comparison of each approach, including where my own company fits and where it does not.

The Four Provider Types Compared

Provider Type	Cost	Turnaround	Engineering-Based?	IRS Defensibility
Technology-enabled + licensed engineer (Modern CFO)	$1,200-$12,000 by engineering scope	1-3 weeks	Yes	High
Traditional Engineering Firm	$5,000-$15,000+	6-12 weeks	Yes	Highest
CPA Desk Study	$1,500-$4,000	2-4 weeks	No	Moderate
DIY software (other vendors, no engineer)	from about $495	Instant	No	Low

Type 1: Technology-Enabled Platforms with Licensed Engineers

These platforms combine AI and modern data tools with licensed engineer analysis. The technology accelerates data collection and pattern recognition; the engineering partners handle professional judgment and final classifications. Physical site inspections are available when property complexity warrants it. Flat-fee pricing means no incentive to inflate classifications. Fees are set by the engineering work required rather than by the property value: $1,200 to $2,500 for residential and small property, $2,500 to $6,000 for standard commercial, $6,000 to $12,000 for large and complex, with a $1,200 floor and no tier that skips the engineer. Best for single-family rentals, small multifamily, short-term rentals, office, retail, and other standard properties. This is the approach Modern CFO uses, and where I believe the industry is heading.

Type 2: Traditional Engineering Firms

An engineer physically visits the property, photographs every component, reviews blueprints, and prepares a detailed asset-by-asset classification. This is the original methodology with the longest track record. Best for large commercial properties ($10M+), highly specialized buildings, and institutional investors requiring on-site documentation. The limitation is cost. Their pricing makes it uneconomical for properties under $500K to $750K.

Type 3: CPA Desk Studies

A CPA applies industry-average percentages using tax software without engineering expertise. The IRS ATG is clear that studies should involve engineering methodology. CPA desk studies may not meet this standard. They are better than no study at all but significantly weaker than engineering-based approaches if examined.

Type 4: DIY Software

Enter your property details, receive a generic report with industry-average allocations. No professional oversight. Not recommended for tax filing. Use only as a screening tool alongside our free calculator.

Which Provider Type by Property Size

Property Value	Best Fit	Why
$250K-$750K	AI + Engineering	Traditional firms are not cost-effective at this range
$750K-$5M	AI + Engineering or Traditional	Both work well; AI + Engineering is faster and cheaper
$5M-$10M	Either (consider complexity)	Standard properties: AI + Engineering. Complex: Traditional
$10M+	Traditional Engineering Firm	Complex properties benefit from on-site physical inspection

For a detailed comparison of cost segregation companies by property size, see Overline's comparison of cost segregation companies by property size.