Compare nine cost segregation firms and platforms for real estate investors in 2026, from specialist and engineer-led studies to DIY software and broader tax advisory services.
Depreciation is one of the few tax breaks you can get from owning investment real estate, but it’s easy to leave a significant amount on the table. A cost segregation study can reclassify parts of your property into shorter depreciation categories, potentially giving you much larger deductions in the first few years of ownership. The harder part is knowing who should actually handle the study.
Some firms give you software and let you run the process yourself, while others send an engineer to inspect your property. A few combine cost segregation with a much broader range of tax services. The right choice depends on your property, how involved you want to be, and whether you need cost segregation alone or as part of a wider tax strategy. Here are nine firms and platforms to consider, starting with a specialist focused almost entirely on this one service.
Best for Dedicated Cost Segregation Expertise – R.E. Cost Seg
R.E. Cost Seg helps you accelerate depreciation, reduce taxes, and improve cash flow through a cost segregation study. The firm works with real estate investors, CPAs, and financial advisors, and its site includes guidance on questions such as when your property is officially “placed in service,” which determines when depreciation can begin.
Because cost segregation is the firm’s primary focus, you get a specialist looking closely at your property’s components rather than a general tax practice that fits the study around dozens of other services. That can matter when you’re trying to identify as many qualifying components as possible, particularly in a property with extensive improvements, renovations, or specialized systems.
If you’re a CPA or financial advisor, you can also hand the technical work and client-facing communication to R.E. Cost Seg while keeping the client relationship on your side. If you’re an investor researching timing rules, its resources can help you understand questions such as when a newly acquired or renovated property qualifies as placed in service before you commission a study.
Best for DIY Studies Under $1.5M – CostSegregation.com
CostSegregation.com takes a different approach from most firms on this list. Instead of hiring a consultant, you can use its self-guided software if your real estate investment has up to $1.5M in building basis, excluding land.
The platform also generates an instant report, uses AI assistance to walk you through the process, and includes a land-versus-building allocation adviser to help separate the two. You can also get corrections on completed reports, a catch-up adjustment schedule under Section 481(a) if you missed depreciation in prior years, and audit support if the IRS asks questions later. If your building basis exceeds $1.5M, you’ll need a custom quote.
The trade-off is how much responsibility stays with you. If you own a smaller investment property and are comfortable working through the process yourself, the software offers a more hands-on approach. If you’d rather have an engineer or tax professional conduct the analysis, a full-service firm will make more sense.
Best for High-Volume National Coverage – ETS
ETS (Engineered Tax Services) is an independent, professionally licensed engineering firm working with clients across the United States on cost segregation, 179D energy-efficiency deductions and R&D tax credits. The firm reports performing more than 10,000 cost segregation, 179D and R&D tax studies a year, giving you access to a provider with experience across a broad range of property types and tax incentives.
That scale can be useful if you own properties in different markets or want to explore several tax incentives through one firm. You also get a provider accustomed to handling a high volume of studies, although a larger operation may not give your individual property the same single-service attention you’d get from a specialist whose entire practice revolves around cost segregation.
Best for Broader Specialty Tax Strategy – McGuire Sponsel
McGuire Sponsel offers cost segregation alongside R&D tax credits, fixed assets, global business services and location advisory work. If your tax planning extends beyond depreciation and you’re looking at credits, incentives or operational questions, that broader range can make the firm a more useful long-term relationship.
The trade-off is that cost segregation represents one part of a much larger specialty tax practice. If your main priority is having a dedicated cost segregation specialist dig deeply into one property, you may prefer a firm with a narrower focus.
Best for Bundled Energy and R&D Credits – CSSI
CSSI offers cost segregation, R&D tax credits, and 179D deductions for energy-efficient buildings. That gives you the option to address several potential tax incentives through one provider instead of coordinating with separate specialists.
This approach makes the most sense if you’re already looking beyond depreciation and want to see whether your property or business qualifies for other incentives. If cost segregation is the only service you need, however, a dedicated specialist may give you a more focused engagement.
Best for Middle-Market Advisory Reach – Baker Tilly
Baker Tilly is a top-10 advisory, tax, and assurance firm focused on middle-market businesses, with services designed around how your business actually operates rather than a one-size-fits-all model. That broader platform can be useful if your real estate holdings are part of a larger business and you want tax, accounting, and advisory support under one roof.
The consideration is focus. You’re getting access to a large professional services firm rather than a practice dedicated exclusively to cost segregation. If you only need a depreciation study for one investment property, that broader relationship may offer more than you actually need.
Best for Combined Credits and Incentives – Corporate Tax Advisors
Corporate Tax Advisors focuses on specialized tax credits and incentives and offers a potential option if your tax planning goes beyond a standalone cost segregation study. The firm’s approach is geared towards identifying opportunities to capture credits and incentives alongside broader tax planning.
This can be useful when you’re trying to look at the full tax picture rather than treating depreciation as an isolated calculation. For a straightforward property where cost segregation is your only priority, however, you may want a provider with a more specialized focus.
Best for Engineer-Based Studies – National Cost Segregation Services
National Cost Segregation Services uses an engineer-based approach to cost segregation studies, with the goal of accelerating depreciation and improving your cash flow. The engineering process involves examining the individual components of your property rather than relying on a simple estimate of the entire building.
That approach can be particularly relevant when your property contains substantial improvements or specialized building systems. If you want the study supported by an engineering analysis rather than relying primarily on software, this type of engagement gives you a more hands-on alternative.
Best for All-In-One Financial Guidance – Aprio
Aprio takes a broader approach by offering accounting, tax, risk, compliance, and growth services under one roof. If you’re already managing a business or real estate portfolio and want a single advisory relationship that covers multiple financial needs, that breadth can be useful.
Cost segregation is one service within that larger offering, rather than the firm’s sole specialty. That makes Aprio more relevant if you want depreciation planning to fit into a broader financial strategy, rather than if you’re simply looking for a dedicated cost segregation study.
Which One Is Right for You
Your choice must depend on the size of your property, how involved you want to be, and whether you need cost segregation alone or want to combine it with other tax work. If you own a smaller property and are comfortable running the numbers yourself, CostSegregation.com’s self-guided software gives you a hands-on option. If you’re already working with an advisor on R&D credits, energy incentives, or broader tax strategy, McGuire Sponsel, CSSI, or Aprio can let you bring cost segregation into that existing relationship. And if you need a firm that can handle studies across different property types and locations, ETS gives you the scale to do that.
If you want the technical analysis handled by a firm that treats cost segregation as its primary focus, R.E. Cost Seg is the best fit. Its specialized approach gives you a team focused on identifying qualifying components and producing a usable study, while CPAs and advisors can outsource the technical work without handing over the broader client relationship.
Before you hire anyone, make sure you understand the IRS rules on depreciation recovery periods, since a cost segregation study still has to work within those rules. You should also confirm when your property was officially placed in service, because depreciation generally can’t start before that date. The right study isn’t simply about getting a larger deduction, but to make sure the classification, timing, and documentation behind that deduction can stand up to scrutiny.
Disclaimer:
This article is intended for general informational and educational purposes only and should not be considered tax, financial, accounting, investment, or legal advice. Cost segregation eligibility, depreciation treatment, potential tax benefits, and reporting requirements depend on individual circumstances and applicable tax rules. Information about third-party firms and services may change over time and does not necessarily constitute an endorsement by Our Good Brands. Real estate investors should verify current provider information and consult a qualified tax or financial professional before making decisions based on cost segregation strategies.
