If you own investment property, someone in your circle has probably mentioned cost segregation without explaining what it actually does.
In plain terms, it’s an engineering-based study that reclassifies qualifying parts of a building so you can depreciate them faster, often over 5, 7, or 15 years instead of the standard 27.5 or 39 years for certain property.
That can accelerate deductions and potentially improve cash flow sooner rather than spreading them over a longer recovery period.
Not every firm that offers this service treats it the same way. Some run it as one line item inside a much bigger tax practice.
Others build their whole operation around it. Below are eight firms worth knowing if you’re an investor, a CPA, or a financial advisor weighing your options for a study.
Best for Firms That Live and Breathe Cost Segregation – R.E. Cost Seg
R.E. Cost Seg helps property owners accelerate depreciation, cut their tax bill, and improve cash flow through a cost segregation study. That’s the whole one-liner, and it’s also the point: this isn’t a side offering bolted onto a bigger tax practice.
Cost segregation is this firm’s sole service. Its process centers on the detailed analysis and turnaround each study requires. That focus may matter when you compare it with a CPA firm offering many services.
CPAs and financial advisors can rely on the firm for the technical work and direct client communication. This lets them focus on the client relationship instead of managing each step of the study.
Investors can compare that approach with other firms. Advisors can also consider it when they need a specialist to work directly with their clients.
Best for High-Volume National Reach – ETS
ETS (Engineered Tax Services) is an independent, professionally licensed engineering firm working with clients across the United States who want to reduce their income taxes through legal, strategic methods. It runs cost segregation alongside other studies like 179D and R&D tax credits.
ETS reports completing more than 10,000 cost segregation, 179D, and R&D tax studies each year. That volume may appeal to investors and advisors who want a firm with experience across many property types.
ETS also works across several tax services. If you want a firm focused solely on cost segregation, compare its approach with that of a specialist before choosing.
Best for Firms with Deep National Tax Credit Experience – KBKG
KBKG has claimed over $11 billion in tax benefits for businesses, real estate owners, and CPAs, built around tax strategies and incentives created by Congress. The firm has been operating for over 25 years and has a proven track record and counts former Big-4 leaders among its nationally recognized experts.
KBKG has offices in Los Angeles, New York, Atlanta, Chicago, Dallas, and Houston. The firm also uses proprietary technology to support its tax work. Its long track record and presence in major markets may appeal to CPAs seeking an established partner.
KBKG offers several tax services, so cost segregation is one part of its broader practice. If you need only a cost segregation study, consider how much attention you want from a firm focused on that service.
Best for a Simple Three-Service Menu – CSSI
CSSI keeps its offering narrow: cost segregation for property owners, R&D tax credits for businesses, and 179D deductions for energy-efficient buildings. There’s no attempt to be a full-service tax shop here, just three specific, related services under one roof.
That kind of focus can work well if you want a firm that isn’t distracted by dozens of unrelated tax products, while still being broader than a pure cost-segregation-only practice. It’s a reasonable middle ground between a single-service specialist and a sprawling advisory firm.
Best for Combined Specialty Tax Services – McGuire Sponsel
McGuire Sponsel calls itself the nation’s leading specialty tax consulting firm, and its service list backs up that positioning: R&D Tax Credits, Fixed Assets, and Global Business and Location Advisory services all sit under one roof.
Fixed Assets is the category where cost segregation work typically lives at a firm like this, alongside a genuinely global and location-focused practice. That breadth suits a business with tax needs that stretch well past property depreciation, like a company weighing where to locate a new facility or navigating cross-border tax questions.
If your only need is a cost segregation study, you’re tapping into one piece of a much larger practice.
Best for Middle-Market Advisory Depth – Baker Tilly
Baker Tilly is a top 10 advisory, tax, and assurance firm built around bringing enterprise-level thinking to middle-market businesses. The pitch is guidance built around how a business actually operates, not a generic template applied across every client.
This is a firm suited to a business that wants its cost segregation work handled inside a much larger advisory relationship, one that also covers assurance and broader tax strategy. A property owner who just wants a standalone depreciation study without a bigger advisory engagement may find this a heavier relationship than they need.
Best for Engineer-Based Studies – NCSS
NCSS runs engineer-based cost segregation services built to accelerate depreciation and boost cash flow. That’s a short, specific pitch, and it puts the firm’s engineering credentials front and center rather than folding cost segregation into a broader menu.
It’s a straightforward option if you want a study grounded specifically in engineering methodology and don’t need a firm that also handles a dozen adjacent tax services.
Best for Broader Credits and Incentives Work – Corporate Tax Advisors
Corporate Tax Advisors works as a specialty tax advisor focused on credits and incentives. The firm’s positioning centers on identifying and capturing tax credits a business might otherwise leave on the table, rather than a single-service depreciation practice.
If your priority is a firm that thinks broadly about which credits and incentives apply to your business, not just depreciation timing, this is a name worth having on your list.
Which One Is Right for You
The right fit depends mostly on how much company you want cost segregation to keep. If you’re also managing the broader financial side of a rental property, Nerdy Mamma’s guide to smart landlord finances covers taxes, deductions, record-keeping, and depreciation alongside the day-to-day financial work of owning rental property.
If you need R&D credits, fixed asset services, or broader advice alongside a study, consider McGuire Sponsel, Baker Tilly, or Corporate Tax Advisors. Their services cover more than cost segregation.
For national reach and an established track record, look at ETS and KBKG. CSSI and NCSS offer a narrower range of services.
R.E. Cost Seg is worth a closer look if you prefer a firm focused on cost segregation. Its specialist approach may appeal to investors, CPAs, and financial advisors who want support with both the technical study and client communication.
Before picking any firm, it’s worth understanding the mechanics behind the tax benefit itself. The IRS outlines how MACRS depreciation works for different classes of property, which is the framework every cost segregation study is built to accelerate.
For a broader primer on the practice, the Cost Segregation Audit Techniques Guide published by the IRS explains what examiners actually look for in a study.
