Three different jobs. Three different picks.
Reviewed by Cost Segregation Reviews Editorial Board · Last reviewed: · Methodology
Disclosure: Cost Seg Smart LLC operates this site and is ranked among the 27 providers below. Same methodology applied to all.
Cost segregation isn't one job — it's seven jobs depending on property size, audit risk, turnaround need, and who your CPA is. Each pick below is the strongest fit for its category, scored on the same six-criteria rubric. Cost Seg Smart wins three (Value, sub-$1M STR/Residential, Turnaround). It loses four to providers that are factually better for those situations — those losses are how editorial integrity works on this site.
7 named CCSP principals, 30K+ studies, helped author the IRS Audit Techniques Guide. $1.5M+ qualifier explicitly excludes small residential.
$495 entry tier — same federal methodology (Rev. Proc. 87-56, IRS Pub 5653) as $5K+ providers. The 10× spread buys documentation depth, not a bigger deduction.
Strongest audit-defense claim in the industry: zero IRS adjustments across 30K+ studies. In-house engineers + CPAs review every report.
Built for the segment big firms qualify out of (KBKG min: $1.5M+). $795 buys the same federal classification a $5K provider produces, minus the unrequired site visit.
25 yrs · 75K+ studies · $2B+ saved · 98% satisfaction. Named case studies with disclosed dollar amounts. AICPA member.
Under 1 hour. Only firm in the 27-provider dataset that publishes turnaround time. Industry benchmark is 4–8 weeks. Engineer signs off on each report before delivery.
Most mature CPA partnership in the category — co-branded deliverables, CCSP-signed reports, audit-defense scope CPA peer-review recognizes.
How to read the awards. Cost Seg Smart wins three categories where the rubric supports it (Value, sub-$1M STR/Residential, Turnaround). It loses four because better-fit providers exist for those buyers — KBKG for $5M+ commercial and CPA partnership, Cost Segregation Authority for audit-defense, Engineered Tax Services for big-firm reassurance. Same six-criteria rubric applied to all 27 providers. The losses are the integrity scaffold for the wins.
Eight rows of objective, verifiable facts. No spin — every value reflects what the provider publishes on their own site or has confirmed to industry reports. Where ties exist, they're listed as ties.
| Criterion | Cost Seg Smart | KBKG | Engineered Tax Services | Cost Segregation Authority |
|---|---|---|---|---|
| Residential STR study price | $495–$895 | $3,500+ (quote-only) | $3,000–$12,000 (FAQ-disclosed) | $6,000–$12,000 (industry-reported) |
| Published turnaround time | Under 1 hour | 4–6 weeks (industry benchmark) | "Schedule consultation" | "Schedule consultation" |
| Methodology basis | IRS Pub 5653 | IRS Pub 5653 | IRS Pub 5653 | IRS Pub 5653 |
| Audit defense scope | Included w/ named scope | Included | "Audit support materials in deliverables" | Zero IRS adjustments / 30K+ studies |
| Engineer sign-off | Every study | Every study (CCSP-credentialed) | Every study (licensed engineering firm) | Every study (in-house engineers + CPAs) |
| Sample report available | Public download | Request only | Request only | Request only |
| Pricing transparency | Published tiers on site | Quote-only | Quote-only (FAQ-acknowledged range) | Quote-only |
| Target property size | $200K–$3M | $1.5M+ qualifier | $1M+ commercial bias | $1M+ multifamily / commercial |
Cost Seg Smart wins 4 of 8 rows on objective facts (price, turnaround, sample report, pricing transparency). Cost Segregation Authority wins audit defense on the zero-adjustment track record. KBKG and ETS lead on credibility-by-volume rather than head-to-head facts. All four apply the same federal methodology. Values reflect public claims as of May 2026.
The good, the bad, and when to skip them entirely. Click any row to expand.
The CPA-default firm. 30,000+ studies, biggest CCSP-certified team in the country, A+ BBB. Their staff helped write the IRS Audit Techniques Guide. Not "follow." Wrote. Real credibility on complex commercial and Tax Court defense. KBKG also runs costsegregation.com, their own DIY tool starting at $495 — meaning KBKG itself agrees not every property needs the $5K+ treatment.
Best in class for complex commercial and industrial. Overkill and overpriced on a standard rental house. KBKG's own DIY tool is the better fit for that.
Visit KBKG ↗| Pricing | $5K–$15K+ | Turnaround | 4–8 weeks |
|---|---|---|---|
| Site visit | Yes (standard) | Studies completed | 30,000+ |
Every industry has That Guy on every podcast and forum thread. In cost segregation, that's Yonah Weiss. He founded R.E. Cost Seg and he's everywhere: LinkedIn, BiggerPockets, podcasts you've never heard of. That level of visibility usually makes us suspicious. Yonah knows his stuff. His content teaches instead of just generating leads.
The company has done 15,000+ studies and claims an NPS above 90. The $950 Rapid Report is the entry product — but only for residential ≤4 units with depreciable basis under $800K and capex under $50K. It comes back in under a week. Every STR investing forum we checked points here first. They handle furnished rental FF&E better than most firms. If your Airbnb is full of furniture and decor, that's 5-year property, and a lot of firms just don't capture all of it.
Heads up on the scope: if your property is over $800K basis, has 5+ units, or has $50K+ in capex, the Rapid Report doesn't qualify. You're bumped to their $2,800+ Fully Engineered Residential — still less than KBKG ($5K+), but no longer a $950 ticket.
Own an Airbnb under $800K basis? This is probably your best bet. $950 Rapid Report, CPAs are comfortable filing it, and Yonah's team knows STR inside and out.
Visit R.E. Cost Seg ↗| Pricing | $950 (Rapid, scope-capped) / $2,800+ (Engineered) | Turnaround | 5–10 days / 3–4 wks |
|---|---|---|---|
| Site visit | Video call option | Studies completed | 15,000+ |
We operate Cost Seg Smart. Take this review with that context. We score it the same way as everyone else, and you can decide if the ranking is fair. The disclosure banner is at the top of the page for a reason.
Newest company on the list (founded 2025) and the most automated. Order online. A 35–40 page report shows up in your email in under an hour. Uses RSMeans 2024 cost data, follows the IRS ATG methodology. Same engineering foundation as the firms charging $5,000–$15,000. A computer does the component analysis instead of a person walking through your living room with a tape measure.
On a standard rental house, that distinction matters less than the industry says. Cabinets are cabinets. Carpet is carpet. A kitchen island depreciates over 5 years whether software or a human classifies it. On something unusual like a converted church or a mixed-use with a restaurant downstairs, we'd want a human making judgment calls. The CPA-Ready Guarantee covers free revisions if your accountant wants changes.
$495–$795 vs. $5,000+. The tax outcome on a standard rental or STR comes out close to the same. The price gap is hard to ignore, especially if you own more than one.
Visit Cost Seg Smart ↗| Pricing | From $495 | Turnaround | Under 1 hour |
|---|---|---|---|
| Site visit | No (remote observation) | Studies completed | Not disclosed |
Two things stand out. First, they refund you if the IRS finds a problem with their work. Most firms offer "audit defense," which means a letter and maybe a call. Seneca puts money on the line. Second, they're the only firm on the list where hospitality is the core business instead of a side line. Hotels, resorts, restaurants, conference centers. Commercial kitchens, specialized HVAC, fast-turning FF&E — they know the breakdowns.
If you own a hotel, restaurant, or hospitality property, start here. Their refund guarantee backs it up.
Visit Seneca Cost Seg ↗| Pricing | Est. $3K–$10K | Turnaround | 2–4 wks; rush ~1 wk |
|---|---|---|---|
| Site visit | Yes | Studies completed | Not disclosed |
CSSI claims 60,000+ studies, which would make them the highest-volume firm on this list. Around since 2003. Franchise model out of Indianapolis. A+ BBB. Forum sentiment splits by property type: commercial clients post happy reviews, residential clients post complaints about inflated savings estimates and aggressive sales follow-up.
Legit firm. Good at multifamily and commercial. The pricing, turnaround, and sales reputation kept them at #5.
Visit CSSI ↗| Pricing | $5K–$15K+ | Turnaround | 4–8 weeks |
|---|---|---|---|
| Site visit | Yes | Studies completed | 60,000+ (claimed) |
Big tax specialty firm out of Indianapolis. Cost seg is one of several services (R&D credits, 179D, fixed asset reviews). Midwest CPAs talk about them. Individual investors don't, because McGuire Sponsel doesn't market to them. It's a CPA-referral business.
Good firm. Your CPA has to recommend them. You won't find them on your own.
Visit McGuire Sponsel ↗| Pricing | $5K–$15K+ (Est.) | Turnaround | 4–8 weeks |
|---|---|---|---|
| Site visit | Yes | Studies completed | Not disclosed |
Their whole pitch: nobody comes to your property. You do a "Smart Tour" yourself — a guided FaceTime walkthrough — combined with satellite imagery and assessor data. Mid-market pricing. 2–3 week turnaround.
Sits between full-service and automated. Decent middle ground if you want a human involved without paying $8K.
Visit Remote Cost Seg ↗| Pricing | Est. $2K–$8K | Turnaround | 2–3 weeks |
|---|---|---|---|
| Site visit | Smart Tour (remote) | Studies completed | Not disclosed |
The firm CPAs refer to when they want white-glove treatment on a commercial deal. No Instagram. No webinars. Pure CPA referral relationships since 2004.
If your accountant said "use Capstan," trust it. Otherwise this isn't for you.
Visit Capstan Tax ↗| Pricing | Est. $5K–$10K+ | Turnaround | 3–5 weeks |
|---|---|---|---|
| Site visit | Yes | Studies completed | Not disclosed |
Not a pure cost seg shop. In-house engineers and CPAs, offices in four states, also runs HOA reserve studies. If you need cost seg and a reserve study for a condo association, the one-stop-shop angle could be useful.
Worth a look if you need multiple engineering services. For cost seg alone, we want to see more track record.
Visit Maven Cost Seg ↗| Pricing | From $1,900 | Turnaround | 3–4 weeks |
|---|---|---|---|
| Site visit | Optional | Studies completed | Not disclosed |
Cost seg arm of O'Connor & Associates, a big Texas property tax firm. O'Connor's main business is property tax protests. Cost seg runs on top of that infrastructure.
Cheap and backed by a real firm. Worth a call if you're price-sensitive. Pin them down on what the $500 tier actually delivers before paying.
Visit Expert Cost Seg ↗| Pricing | From $500 | Turnaround | Varies |
|---|---|---|---|
| Site visit | Optional | Studies completed | Thousands |
Every firm has blind spots. Here's where each one falls short — including ours.
* We operate Cost Seg Smart.
Across 27 providers, the average overall score is 7.4/10. Quoted prices run from $495 to $25,000+ for the same IRS Audit Techniques Guide methodology. The 50× spread is delivery model and report volume, not study quality.
Sorted by overall score. Use the filter to narrow by company name.
A firm that nails hotels can flunk rental houses. We score each property type on its own. Best for STR ↗ Best for multifamily ↗ Best for commercial ↗
Estimated year-one federal tax savings with 100% bonus depreciation. Simplified math — confirm with your CPA before filing.
Same year-1 deduction. Different study price. The price you pay determines what you keep. Traditional firms quote up — prices below reflect typical $1M–$3M residential/small-commercial quotes. Above $5M, expect the high end of every range.
On your inputs, you keep an extra $7,005 by going with Cost Seg Smart instead of a typical $7,500 study. Same year-1 deduction. The only thing that changes is what you paid for the report.
Simplified math. Assumes 25% reclassification (R), 30% (STR), 28% (M), 22% (C). Ignores state decoupling, passive-activity rules, REPS qualification, and depreciation recapture at sale. This is not tax advice.
Disclosed market guide. We operate Cost Seg Smart, one of the firms ranked here. No paid placements from the other 24 providers. Full methodology →
Is pricing on the website? Do public forums confirm it? Firms requiring a sales call to quote were docked.
Does the firm follow the IRS Audit Techniques Guide? RSMeans data? Engineering review vs. pure templating.
Hours vs. weeks. Site-visit requirements. Remote-observation options. CPA workflow integration.
A firm that crushes a 12-unit complex can flunk a $400K SFR. We score per category, not overall.
A subset of visitors see a "Recommended for your segment" panel above the rankings. The recommendation matches the property class, not the highest-overall score. On sub-$5M residential, STR, and MF, we recommend Cost Seg Smart (which we operate) because the methodology gap to traditional firms stays small and price plus turnaround drive the decision. On $5M+ commercial and industrial, we point you to a comparison calculator first because the right answer is property-specific. The rankings themselves don't move. Only the recommended action does.
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