Seneca Vs KBKG Vs Madison SPECS: What Sets Engineering-Based Studies Apart

If a real estate investor is trying to figure out what makes Seneca Cost Segregation’s engineering-based studies different from KBKG or Madison SPECS, this article is for them.

Choosing the wrong provider can cost investors more than the study itself. All three firms claim to follow IRS-approved methodology. But their approach, experience, pricing, and turnaround time differ quite a bit.

Here is an honest, research-backed breakdown to help investors make a smarter call.

TL;DR – Key Differences Between Seneca, KBKG, and Madison SPECS

Here is a quick summary of how these 3 providers compare across the factors that matter most:

Seneca Cost Segregation Approach and Methodology

Seneca Cost Segregation is a fast, transparent, and investor-friendly option. The firm is based in Albany, Oregon, but operates across all 50 states through a mostly virtual process.

With over 10,200 properties assessed and more than $5 billion in cost basis analyzed, they have built a solid track record for a firm of their size.

Their workflow follows a simple 3-step structure:

• Free preliminary estimate: Investors get a savings projection before committing to anything.
• Document collection and site tour: Seneca gathers the client’s property records and conducts a virtual or in-person walkthrough.
• Report delivery: The final study and fixed asset schedule go straight to the client and their CPA.

Most site visits happen remotely through a guided video walkthrough. That cuts turnaround to 2 to 4 weeks, with a 1-week rush option for clients up against a filing deadline. The industry average is 4 to 8 weeks, so that is a meaningful gap.

A few things worth knowing about how Seneca Cost Segregation works:

• Engineering-based methodology: Every study is conducted by in-house engineers who identify and classify building components using an engineering-based approach. That means findings are accurate, well-documented, and defensible if the IRS ever asks questions. On average, clients turn 20-40% of their property costs into immediate tax savings.
• Post-study support: Once the study is done, Seneca does not disappear. They help clients and their CPA implement the findings effectively, walking through the report and ensuring nothing gets missed.
• Seneca AuditDefense: Audit defense is included at no extra charge and covers the entire ownership period. If an audit does come up, Seneca Cost Segregation steps in to defend their study directly.
• Money-back guarantee: If their error results in a depreciation adjustment of more than 5%, they refund 100% of their fee. That kind of guarantee is rare in this industry.

The main limitation is that Seneca is a newer firm compared to KBKG and Madison SPECS.

That said, investors looking for a fast, engineering-backed study with strong post-delivery support can request a free proposal to see what their property qualifies for.

What Investors Are Saying About Seneca

Real investor feedback on Seneca is starting to show up in forums. On a Reddit thread in r/realestateinvesting, u/alanzinger shared:

“You might talk to Seneca Cost Seg. They are similar to cost seg guys, but in my experience, a little more affordable and helped me understand how much depreciation would apply to my 2024 tax filing.”

Over on r/tax, u/DueControl5024 compared several firms before deciding:

“I ended up going with Seneca Cost Segregation. The sales guy I worked with was an ex-accountant and answered all my questions, and their pricing was straightforward. Results were solid and didn’t take too long.”

For a newer firm, that kind of word of mouth is a decent early signal.

KBKG’s Approach

KBKG was founded in 1999 and is headquartered in Pasadena, California, with 7 offices across the country.

Their methodology follows the IRS Detailed Engineering Approach, Methods 1 and 2. Members of their team helped write the IRS Cost Segregation Audit Techniques Guide.

A few other things about KBKG:

• CCSP credentials: They have the largest ASCSP-certified team in the industry, including Gian Pazzia, a past ASCSP Board President, and several other CCSP-designated professionals.
• Depth of analysis: Studies go beyond standard reclassification. They separately identify major structural components like roofing, HVAC, and windows for future partial-disposition deductions.
• Multi-service capability: Clients who need R&D credits, 179D deductions, or 45L energy incentives alongside their cost segregation study will find that KBKG handles it all under one roof.

Full-service studies run $5,000 to $15,000. Clients are looking at 45 to 60 days for turnaround, which is slower than smaller firms. In-person engineering work takes time.

For smaller residential properties, they also offer Cost Seg Pro, a DIY tool starting at $495. Audit defense is bundled in through their Advantage Audit Guarantee.

One limitation worth noting: for properties under $400,000, KBKG typically steers investors toward their software tool rather than a full engineering study.

That may not suit every investor’s needs, particularly those who want a fully engineered, audit-ready report regardless of property size.

What CPAs and Investors Think About KBKG

KBKG comes up frequently in professional tax circles.

On the White Coat Investor forum, CPA Stephen L. Nelson shared an interesting experience. When a client’s property was too small for a full study, KBKG recommended having the CPA handle it instead.

Nelson also noted that KBKG offers a DIY residential software tool for smaller properties as a lower-cost option.

On r/AdvancedTaxStrategies, the picture is more mixed. u/sgtpepper731 noted the quote they received was nearly double compared to other firms.

u/SpecialistSail7657 flagged a concern worth paying attention to:

“KBKG is a huge business, but for rentals under $400,000, they usually try to get you to use their residential software tool. My CPA told me that using software that uses algorithms without a fully engineered report is a surefire way to get an audit.”

KBKG is well-regarded for complex commercial work, but for smaller residential portfolios, its software-first approach may not suit every investor’s needs.

Madison SPECS’ Methodology

Madison SPECS has been around since 2006 and is part of Madison Commercial Real Estate Services. They are based in Lakewood, New Jersey, with a presence in New York City and clients across the country.

Their founder, Eli Loebenberg, spent years at Deloitte, KPMG, and Grant Thornton doing cost segregation work before launching the firm. That Big Four background shows in how the firm is structured.

Here is what makes their approach distinct:

• Hybrid tax and engineering model: In-house CPAs and in-house engineers work together on every study. That collaboration is a structural choice many firms skip.
• Two site visit options: Clients can choose a traditional in-person inspection with on-site measurements and documentation, or the proprietary SMARTour system. With SMARTour, on-site personnel use a specialized kit to capture property data, while an off-site engineer remotely guides the process. Useful for investors whose properties are spread across multiple states.
• Scale: They have completed over 30,000 studies and report more than $3 billion in tax savings delivered to clients.

Madison does not prominently promote ASCSP CCSP credentials the way KBKG does, and its public review footprint is limited. This makes independent verification harder.

Much of their visibility comes through Yonah Weiss, their regional business director, who has built a large audience through podcasting and content work. His role is education and outreach. The engineering sits with the broader team.

What Clients and Investors Say About Madison SPECS

Madison SPECS has a strong following, particularly among multifamily and short-term rental investors. On r/realestateinvesting, u/Animalsrthebest9023 shared a firsthand account:

“We have used Yonah Weiss from Madison Specs. The initial estimate was $6k split into two $3k payments. We did negotiate it down, but it did save us $50k in the first year in taxes.”

On r/ShortTermRentals, u/Samtyang offered a more measured take for smaller portfolios:

“I’ve seen Madison Specs mentioned a lot. Just make sure they’ll stand behind it if you get audited and that they’re not just spitting out a spreadsheet. Ask if they include audit support and how they handle prior-year catch-up.”

Solid reputation overall, though investors with smaller properties are advised to ask the right questions upfront before committing.

Benefits of Engineering-Based Cost Segregation Studies

The IRS Cost Segregation Audit Techniques Guide ranks 6 methodologies from most to least defensible.

Engineering-based approaches sit at the top. According to the guide, the Detailed Engineering Approach from actual cost records is “the most methodical and accurate approach, relying on solid documentation and minimal estimation.”

The practical benefits of engineering-based studies include:

• Higher accuracy in reclassifying components like specialty plumbing, electrical systems, and land improvements.
• Stronger audit defense because every classification ties back to documented engineering analysis.
• More depreciation recovered in year 1, which improves early-year cash flow.
• Detailed asset schedules that CPAs can use directly for tax filings and amended returns.

By contrast, rule-of-thumb methods, which use fixed-percentage allocations, sit at the bottom. The IRS notes that examiners should view this approach with caution due to a lack of documentation.

A study not built on real property data is harder to defend if the IRS ever questions classifications.

Real investors confirm this. In a r/ShortTermRentals thread on cost segregation and cash flow, u/Mundane_Ad_3811 put it plainly:

“If you buy a cheap rule of thumb report, your CPA will hate you and probably charge you more to figure it out. My CPA literally just plugged in the numbers and filed because they completed a fully engineered study so quickly, and the data was so clean.”

u/Gabby_N_The_Whip pointed out something worth knowing for newer properties specifically:

“If the property is newer, you’re likely looking at a significant amount of 5 and 15-year property that can be reclassified. The key is finding a provider that uses the RCNLD (Replacement Cost New Less Depreciation) method to satisfy IRS engineering standards.”

They also noted that a video walkthrough with a local property manager was enough to produce a fully engineered report that their CPA felt comfortable defending.

And u/Born_Intern_3398 summed up what CPAs actually look for when receiving a study:

“Their focus was just that it was properly documented and engineering-based.”

The quality of the methodology determines how useful the study is, both for tax filing and for CPA’s peace of mind.

Common Mistakes When Choosing a Cost Segregation Provider

A few errors come up repeatedly when investors pick cost segregation companies.

These include:

• Choosing by price alone: Low-cost studies often use rule-of-thumb approaches that will not hold up in an audit. A cheap study that gets challenged costs far more than a quality one.
• Not checking credentials: Ask how many certified professionals will be working on the study, what their engineering background is, and how many studies they have completed. Credentials matter more than marketing claims.
• Accepting contingency fee arrangements: The IRS explicitly scrutinizes these. A firm charging a percentage of savings rather than a flat fee is a red flag.
• Skipping the math on passive losses: Many investors cannot use paper losses without Real Estate Professional Status or the short-term rental loophole. A study is not of much value if one cannot apply the deductions.
• Ignoring depreciation recapture: Accelerated depreciation at sale is recaptured at ordinary income rates for Section 1245 property, up to 37%. For investors planning to sell soon without a 1031 exchange, the accelerated deductions taken during ownership may cost more at sale than they saved upfront.

Decision Criteria for Selecting the Right Provider

To avoid these issues, before signing anything, run through these questions:

• Do the engineers working on the study have verifiable construction and engineering backgrounds?
• Does the firm use Method 1 or Method 2 from the IRS Audit Techniques Guide?
• Is a site inspection included, whether in-person or virtual?
• Is pricing a flat fee?
• Is audit defense included for the full ownership period?
• Can they share a sample report for the CPA to review beforehand?
• Do they reconcile total allocated costs to actual documented costs?
• How many studies has the firm completed? Can they share references or case studies?

Frequently Asked Questions (FAQs)

Below are a few common questions about cost segregation studies worth knowing the answers to.

How Long Does a Cost Segregation Study Take to Complete?

Most studies take 4 to 8 weeks from start to finish, depending on property complexity and how quickly the client can provide documents. Check out our article for the full cost segregation study timeline, broken down by property type.

Does Cost Segregation Impact Property Sale Value?

No. It’s a tax tool that doesn’t affect the property’s appraisal or resale price. What it does affect is the tax bill at sale, since the IRS taxes back the depreciation deductions claimed during ownership when the property is sold.

Can Cost Segregation Trigger an IRS Audit?

A cost segregation study alone won’t trigger an audit. The IRS sanctions the practice and publishes a full Audit Techniques Guide for examiners.

That said, a poorly documented study draws far more scrutiny than a properly engineered one, which is also why doing an independent cost segregation study carries real risk.

Conclusion

Picking the right firm comes down to experience, methodology, and what happens after the study is done. Seneca Cost Segregation, a veteran-owned firm, delivers on all three.

The founders have spent over a decade investing, building, and selling real estate. Their engineering team has 12+ years of cost segregation experience, and the average first-year deduction is $171,243 per client.

Beyond the study, investors get access to a network of fellow investors, CPAs, and tax advisors, plus complimentary tax assessments to keep savings going.

The longer investors wait, the more they overpay in taxes. Get a free savings estimate today.