A cost segregation study can reclassify parts of your building into shorter depreciation periods, usually 5, 7, or 15 years, instead of the standard 27.5 or 39 years. That can put more cash back in your hands sooner, which is the main reason investors use accelerated depreciation under MACRS. The bigger question is how much value your property has to uncover and who you want handling the study.
Not every provider approaches the work the same way. You can choose software-driven reports for smaller properties, an engineering-heavy firm for complex commercial assets, or a broader tax practice that folds cost segregation into other services. Your property’s size and complexity, as well as your preferred level of involvement, should determine which route makes the most sense. Here’s a look at nine firms to consider before you choose one.
Best for Deep Cost Seg Expertise and Fast Turnaround – R.E. Cost Seg
R.E. Cost Seg helps you accelerate depreciation, reduce taxes, and improve cash flow through a dedicated cost segregation study. Cost segregation is the firm’s primary focus, shaping how it works with investors, CPAs, and financial advisors.
That specialization can matter when you’re trying to identify every qualifying component of a property rather than settling for a standard depreciation schedule. Leasehold improvements are a good example. Tenant build-outs and interior upgrades can sometimes qualify for accelerated treatment, but they’re easy to overlook if you’re relying on a generalist approach.
If you’re a CPA or financial advisor, you can also use R.E. Cost Seg as a behind-the-scenes technical partner. The firm can handle the study and client-facing communication while you maintain the broader relationship. For investors, the benefit is having a specialist focused specifically on finding opportunities to accelerate depreciation rather than treating cost segregation as one service among many.
Best for Self-Service Cost Seg on Smaller Properties – CostSegregation.com
CostSegregation.com is aimed at property owners with up to $1.5 million in building basis, excluding land. Instead of hiring a team to inspect your property and prepare the study, you run the process through the platform’s software.
You get instant reporting, AI assistance, a land-versus-building allocation advisor, and audit support. Pricing is also published directly, with residential studies starting at $495 for a $750,000 tax basis and commercial studies at $1,295 for a $1,000,000 tax basis. If your building basis exceeds $1.5 million, you’ll need a custom quote.
The trade-off is how much of the process you handle yourself. If you have a straightforward rental or small commercial property and you’re comfortable working through the numbers, the self-guided model can keep things simple. If your property is larger or more complex, you may be better off with a provider that assigns an engineer or specialist directly to the engagement.
Best for High-Volume Engineering-Based Studies – ETS
ETS is an independent, professionally licensed engineering firm that works with clients across the country on cost segregation, 179D and R&D tax studies. The firm reports performing 10,000 cost segregation, 179D, and R&D tax studies a year, giving you access to a provider with substantial experience across different property types and tax incentives.
That scale can work in your favor if you own a large portfolio or need a firm capable of handling multiple studies. You also get an engineering-based approach rather than relying solely on software. The consideration is whether you need that level of infrastructure. For a smaller or straightforward property, a boutique provider may give you more individualized attention.
Best for Bundled Specialty Tax Consulting – McGuire Sponsel
McGuire Sponsel offers cost segregation, R&D tax credits, fixed assets, global business services, and location advisory work. If your tax situation extends beyond depreciation, having several specialty services available through a single relationship can save you from coordinating with multiple providers.
That broader scope is most useful when you’re dealing with several tax or operational questions at once. If all you need is a focused cost segregation study for one investment property, however, you may prefer a firm where that single service receives most of the attention.
Best for Combining Cost Seg with Energy Incentives – CSSI
CSSI covers three main areas: cost segregation for property owners, R&D tax credits for businesses, and 179D deductions for energy-efficient buildings. The 179D component can be particularly relevant if you’re dealing with a building that may qualify for energy-efficiency incentives.
That combination gives you a chance to consider depreciation and energy incentives together rather than evaluating them separately. It’s a good fit if you’re trying to uncover multiple tax opportunities around the same property or business. If energy incentives and R&D credits aren’t relevant to you, a more narrowly focused cost segregation provider may be all you need.
Best for Enterprise-Level Advisory Alongside Cost Seg – Baker Tilly
Baker Tilly is a top-10 advisory, tax, and assurance firm serving middle-market businesses, with tax work integrated into a much broader advisory platform. If your real estate investments sit within a larger business and you need accounting, tax and strategic guidance alongside cost segregation, that wider relationship can be useful.
The trade-off is scale. If you’re simply looking to have one property analyzed for accelerated depreciation, an enterprise-level advisory firm may offer considerably more infrastructure than your situation requires.
Best for Specialty Tax Credits and Incentives – Corporate Tax Advisors
Corporate Tax Advisors specializes in tax credits and incentives. If you’re looking beyond depreciation and want to explore whether your business or property qualifies for additional tax benefits, that broader specialty can be useful.
For a straightforward cost segregation engagement, though, you’ll want to compare how much of the firm’s attention goes toward cost segregation itself versus the wider range of incentives it handles.
Best for Engineer-Based Studies Focused on Cash Flow – National Cost Segregation Services
National Cost Segregation Services uses an engineer-based approach to cost segregation to accelerate your depreciation and improve cash flow. The engineering focus means your property is evaluated by its individual components rather than treated simply as a single depreciable asset.
That can be valuable when you’re dealing with a property that has substantial improvements, specialized systems, or other components that may not fit neatly into a standard depreciation schedule. If you want the study backed by an engineering review rather than primarily by a software process, this approach offers a more hands-on option.
Best for Broad Financial and Compliance Support – Aprio
Aprio covers finances, taxes, risk, compliance, and growth, which makes it a broader financial and advisory relationship rather than a cost segregation-only practice. If you already need help across several areas of your business or investment operations, having those services under one roof can make the relationship easier to manage.
Cost segregation is just one part of that wider offering. If your only goal is to maximize depreciation on a single property, you may get more focused attention from a specialist.
Which One Is Right for You
The right cost segregation choice comes down to your property’s size, its complexity, and how much of the process you want to hand off. If you have a smaller, straightforward property and don’t mind working through the process yourself, CostSegregation.com’s self-guided platform can make sense, particularly if your building basis falls below its $1.5 million threshold. If you’re managing a larger portfolio or already dealing with R&D credits, energy incentives or other specialty tax issues, McGuire Sponsel, CSSI or Baker Tilly may fit better because you can bring several services into one relationship.
If you want a specialist handling the study from start to finish, R.E. Cost Seg is the clearest choice on this list. Because cost segregation is your property’s primary focus, it isn’t competing with unrelated tax and accounting work for attention. The firm can also serve as a technical partner to your CPA or financial advisor, giving you access to specialized expertise without requiring your existing advisor to build that capability in-house.
Before you hire anyone, make sure you understand the IRS rules on depreciation recovery periods, since your cost segregation study still has to operate within those rules. You should also confirm when your property was officially placed in service, because depreciation generally can’t begin before that date. A good study isn’t simply about producing a bigger deduction. You need the classification, timing, and documentation behind that deduction to make sense for your property and hold up under scrutiny.