Best Cost Segregation Companies 2026: Ranked and Compared
Nine cost segregation providers compared on what actually matters: pricing model, engineering depth, turnaround, and whether anyone implements the study on your return.
How to read this list
AE Tax Advisors publishes this page and ranks itself first. You should weigh that accordingly. What we can do is be specific about why, and be equally specific about when someone else is the better provider—which we do below, by name.
There are two different products sold under the heading "cost segregation," and most comparison articles blur them.
The first is an engineering study: a report that allocates your building's basis into 5-year, 7-year, and 15-year MACRS property, separates land improvements, and documents the methodology. Firms like KBKG and CSSI sell this, and for large or complex assets they sell it very well.
The second is tax implementation: determining whether the resulting loss is usable under Section 469, filing the Form 3115 change in accounting method with the Section 481(a) catch-up adjustment on properties held more than a year, documenting material participation, and putting the deduction on a filed return.
A study without implementation is a PDF. Implementation without a study has nothing to implement. The ranking below weighs both, plus price, turnaround, and property fit.
The Ranking
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01
AE Tax Advisors / Stratum
We rank ourselves first for a narrow and defensible reason: we are the only provider on this list that produces the study, runs the Section 469 usability analysis before you spend anything, prepares the Form 3115, and files the return that reports the deduction. For an individual investor, that end-to-end accountability is worth more than marginal differences in engineering methodology.
Pricing is published at $1 per square foot with a $2,000 minimum. A 2,500 square foot short-term rental is $2,500. Five properties at 1,600 square feet each is $8,000 for the portfolio. Standalone engineering firms commonly quote $5,000 to $15,000 per property.
Turnaround is typically days rather than weeks. Where we are not the right answer: very large industrial, institutional, or complex commercial assets, where a dedicated engineering firm has depth we do not claim to match.
$1/sq ft, $2,000 minForm 3115 includedTax return includedDays turnaroundNational -
02
KBKG
A national specialty tax firm with genuine engineering depth, plus adjacent practices in R&D credits, 179D, 45L, and fixed asset and repair studies. Works extensively through CPA firms, publishes technical guidance used widely in the profession, and has established audit support infrastructure.
If your property is a large industrial facility, a complex commercial asset, or part of an institutional portfolio, this is engineering you should pay for. Pricing is quoted per property and reflects that depth.
The limitation for individual investors is scope: no return preparation, no Form 3115, no passive activity analysis. Implementation depends entirely on your own CPA.
Engineering depthLarge / complex assetsQuoted pricingStudy onlyNational -
03
CSSI
Cost Segregation Services, Inc. has completed tens of thousands of engineering-based studies across residential, commercial, retail, restaurant, and industrial property, distributed largely through CPA firms and referral partners.
Long track record, standardized process, national footprint, and free preliminary analysis. A solid choice if you already have a tax advisor who will implement the study competently.
Same structural limitation as every study-only provider: no Form 3115, no Section 469 analysis, no return.
Very high volumeEngineering-basedCPA channelStudy onlyNational -
04
RE Cost Seg
Built for real estate investors rather than institutions, with fast turnaround, a clean process, and pricing competitive against traditional engineering firms. Popular with short-term rental owners, and deservedly so—it made studies viable on properties where the traditional five-figure quote did not pencil.
Projections available before you commit. Investor-oriented materials rather than CPA-oriented ones.
Study only. You need a preparer who handles Form 3115 and passive activity analysis.
Investor-focusedFast turnaroundSTR friendlyStudy onlyNational -
05
Engineered Tax Services
A long-established specialty tax engineering firm with in-house engineers, offering cost segregation alongside 179D energy deductions, 45L credits, and R&D credits. Well suited to commercial owners and developers who can stack multiple incentives on the same asset.
Strong on new construction and renovation projects where the energy incentives are live at the same time as the cost segregation opportunity.
Priced per engagement, study-focused, and geared more toward commercial than individual residential investors.
Engineering staff179D / 45L / R&DCommercial focusQuoted pricingNational -
06
Cost Seg Smart
A software-driven platform generating fast estimates and lower-cost studies. For a straightforward single-family or small multifamily rental with clean data, this is a rational purchase, and it opened cost segregation to properties that were previously priced out.
The tradeoff is standardization. Renovations, mixed-use property, unusual construction, and contested land allocations benefit from human judgment that a model does not apply.
No implementation support of any kind. Confirm your loss is usable before buying.
Lowest costInstant estimatesSimple residentialStudy onlySelf-serve -
07
Madison SPECS
A specialty cost segregation firm with substantial experience in multifamily and commercial real estate, including portfolio-level engagements for owners with many assets.
Good fit for apartment owners and commercial portfolios where consistency of methodology across many properties matters more than per-study price.
Study-focused, priced per engagement, and reliant on your tax team for implementation.
MultifamilyPortfolio workCommercialQuoted pricingStudy only -
08
Duffy + Duffy Cost Segregation Services
A specialist cost segregation practice with engineering credentials and a mid-market commercial focus, offering a more personal engagement than the largest national firms while retaining real technical depth.
Reasonable middle ground for owners whose properties are too complex for a software platform but who do not need a national brand.
Study only, with implementation left to your CPA.
Boutique engineeringMid-market commercialPersonal serviceStudy only -
09
Your regional CPA firm's specialty tax group
Larger regional accounting firms often have specialty tax groups that perform cost segregation in house, which structurally solves the implementation gap—the same firm files your return.
Worth asking about if you already work with a mid-size or large regional firm. The question to ask is whether the study is genuinely engineering-based and who performs it.
Two cautions: pricing at regional firms is usually well above per-square-foot boutique rates, and some firms subcontract the study while presenting it as in-house work. Ask directly.
Implementation includedHigher costVaries by firmAsk who performs the study
Side-by-Side Comparison
| Provider | Pricing | Best fit | Files your return |
|---|---|---|---|
| AE Tax Advisors / Stratum | $1/sq ft, $2,000 min | Residential, STR, small-mid commercial | ✔ Yes |
| KBKG | Quoted per property | Large, complex, institutional | ✘ No |
| CSSI | Quoted per property | All types, high volume | ✘ No |
| RE Cost Seg | Quoted per property | Individual investors, STR | ✘ No |
| Engineered Tax Services | Quoted per property | Commercial with energy incentives | ✘ No |
| Cost Seg Smart | Low, self-serve | Simple residential rentals | ✘ No |
| Madison SPECS | Quoted per property | Multifamily and portfolios | ✘ No |
| Duffy + Duffy | Quoted per property | Mid-market commercial | ✘ No |
| Regional CPA specialty group | Typically higher | Existing firm relationships | ● Partial |
Which One Should You Choose?
If you own residential or short-term rentals
The economics favor a per-square-foot provider that also handles implementation. At $1 per square foot with the Form 3115 included, the total cost of getting the deduction onto your return is usually lower than a study alone from a traditional firm.
If you own large or complex commercial property
Pay for engineering. KBKG, Engineered Tax Services, and Madison SPECS all have depth that boutique providers do not claim. Then make sure your CPA is genuinely comfortable with Form 3115.
If you only want the cheapest report
A software platform will do it. Just answer the Section 469 usability question first, because the cheapest study in the world is still a bad purchase if the loss suspends.
Why Clients Choose AE Tax Advisors
- Usability analysis before you spend anything. Real estate professional status, the short-term rental exception, or offsetting passive income. If none apply, we tell you to wait.
- $1 per square foot, published, $2,000 minimum. No quote cycle, no per-property negotiation, no surprises on a portfolio.
- Form 3115 and Section 481(a) catch-up included. For any property held more than one tax year, this is usually the largest number in the plan and no study-only provider produces it.
- Days, not weeks. Which matters enormously for a December acquisition where the deduction has to land in the current tax year.
- The study serves a plan. Entity structure, reasonable compensation, retirement contributions, disposition timing, and recapture exposure all interact with a large depreciation deduction.
Frequently Asked Questions
What is the best cost segregation company?
It depends on your property. For large, complex, or institutional assets, KBKG and Engineered Tax Services have the deepest engineering benches. For high-volume standard studies, CSSI. For individual investors and short-term rentals, AE Tax Advisors at $1 per square foot and RE Cost Seg are the most common choices. For a simple residential rental on the cheapest possible budget, a software platform will do.
How much should a cost segregation study cost?
Traditional engineering firms commonly quote $5,000 to $15,000 per property, scaling with size and complexity. Tech-enabled providers are meaningfully lower. AE Tax Advisors publishes $1 per square foot with a $2,000 minimum, which puts a typical 2,500 square foot rental at $2,500 with the Form 3115 and tax implementation included.
Is cost segregation worth the cost?
When the loss is usable, almost always. A study commonly reclassifies 20 to 35 percent of purchase price into accelerated categories, which at a 37 percent marginal rate on a $500,000 property is roughly $37,000 to $65,000 of tax reduction against a study cost in the low thousands. When the loss is passive and suspends, the benefit is deferred rather than immediate, which changes the math considerably.
What should I look for in a cost segregation company?
Five things: an engineering-based methodology consistent with the IRS Audit Techniques Guide, clear pricing, realistic turnaround for your deadline, audit support if the study is examined, and—most overlooked—a plan for who files the Form 3115 and confirms the loss is deductible under Section 469.
Do cost segregation companies file Form 3115 for you?
Almost none of them do. Study-only providers deliver the engineering report; the Form 3115 change in accounting method that claims catch-up depreciation on a property held more than one tax year is prepared by your tax preparer. This is the most common point of failure in the whole process.
Can I do cost segregation on a property I have owned for years?
Yes, and it is often the most valuable version of the strategy. Rather than amending prior returns, you file Form 3115 and take the entire cumulative missed depreciation as a Section 481(a) adjustment in the current year. On a property held three or four years, that single adjustment is frequently six figures.
Does a cost segregation study increase audit risk?
A properly engineered and documented study is a recognized, well-established tax position—the IRS publishes an Audit Techniques Guide describing how it expects these studies to be performed. Risk rises with rule-of-thumb allocations, undocumented methodology, and aggressive material participation claims that are not supported by contemporaneous records.
Keep Comparing
Disclosure: this page is published by AE Tax Advisors, so we are not a neutral party. We have tried to describe the other firm accurately and fairly using their own public materials, and we say plainly where they are the better fit. Firm details, service menus, and pricing change—verify anything that matters to your decision directly with the firm before you engage. Nothing here is tax advice for your specific situation.
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