Is Capstan Tax Strategies a legitimate cost segregation provider?

Yes. Capstan is an established specialty-tax firm founded in 2004, producing IRS ATG-aligned engineered cost segregation studies. They have a 20+ year operating history, strong CPA referral relationships, and audit-defense track record across institutional multifamily and $5M+ commercial work. The choice between Capstan and Cost Seg Smart is about property scale ($5M+ vs sub-$5M), buyer channel (CPA-referral vs direct-to-investor), and pricing tier.

Does Capstan handle residential or small commercial?

Capstan's pricing model is built for $5M+ commercial and institutional multifamily. For residential properties (SFR, STR, condo) or small commercial under $5M, their fee structure is generally above the Year-1-ROI break-even point. Buyers in those bands typically use automated providers like Cost Seg Smart or R.E. Cost Seg's Rapid tier.

Can my CPA file a Capstan study the same way as a Cost Seg Smart study?

Yes. Both firms produce reports with the same CPA-actionable components: depreciation schedules, MACRS class assignments per Rev. Proc. 87-56, component-level basis documentation, methodology narrative addressing the IRS Pub 5653 13 quality elements, and Form 3115 §481(a) catch-up schedules for lookback studies. Your CPA will process them identically.

When does Capstan's CPA-partnership model actually matter?

When your CPA has an established working relationship with Capstan from prior engagements, when the procurement model at the property entity is CPA-coordinated (typical for institutional multifamily, syndicate-owned commercial, family-office portfolios), and when the CPA wants to bundle cost-seg into a broader specialty-tax engagement they oversee. For direct-to-investor purchases where the buyer (not the CPA) is the procurement decision-maker, the CPA-partnership channel is less material, an automated direct alternative usually wins on speed and price.

What's the audit-defense difference between Capstan and Cost Seg Smart?

Both firms provide a reviewed report (Capstan via licensed-engineer attestation; Cost Seg Smart via internal technical review & QC), written responses to IRS examiner information document requests (IDRs) about methodology and component classifications, and Form 3115 §481(a) re-derivation support if a lookback study is examined. Cost Seg Smart's audit support is included for 36 months at no additional charge. Audit support at either firm does not include taxpayer representation, your CPA, EA, or attorney handles representation at the examination. The contractual scope is comparable across the engineering-firm tier.

Capstan Tax vs Cost Seg Smart: Commercial and CPA-Partnership Cost Seg Compared (2026)

In one paragraph

Capstan Tax Strategies and Cost Seg Smart both produce IRS ATG-aligned engineered cost segregation studies under industry-standard construction cost data and MACRS classification per Rev. Proc. 87-56. Capstan is a CPA-partnership-driven commercial specialist founded 2004, focused on $5M+ commercial and institutional multifamily where their CPA referral network is the primary buyer channel. Their typical pricing is $5,000, $15,000+ with a 4, 8 week turnaround. Cost Seg Smart's automated studies work from satellite imagery, county assessor records, and structured property data, with internal technical review & QC, delivered in under 60 minutes, starting at $495 for residential under $300K basis and $1,995 for commercial under $2M. Capstan is the right call for $5M+ commercial properties accessed through a CPA partnership where the CPA has an existing Capstan relationship, plus institutional multifamily with specialty FF&E. Cost Seg Smart is the right call for residential, STR, small multifamily, and sub-$5M commercial where speed and price preserve the Year-1 ROI math.

Disclosure: Cost Seg Smart operates this comparison and is one of the firms compared here. See the methodology page for our standalone documentation.

At a glance: commercial and institutional MF comparison

Dimension	Cost Seg Smart	Capstan Tax
Price (residential under $1M)	$495, $895	Generally above their core fit
Price ($1M, $5M commercial)	$1,995, $4,995	$5,000, $10,000+
Price ($5M+ commercial)	$4,995, $6,995	$10,000, $15,000+
Turnaround	Under 1 hour	4, 8 weeks
Site visit	No (remote observation)	Yes (engineer on-site)
Methodology	industry-standard 2026 construction cost data + MACRS + ATG	construction cost data + MACRS + ATG
CPA partnership model	CPA partner program (referral-friendly)	Strong CPA-referral network since 2004
Audit defense	Internal technical review & QC + free CPA response, 36-month window	Engineer attestation + audit support
Form 3115 lookback	Included	Included
Best fit	Residential / STR / small MF / sub-$5M commercial	$5M+ commercial, institutional MF via CPA referral

Methodology overlap (both firms)

The technical machinery is the same:

industry-standard 2026 construction cost data, regional cost multipliers calibrated to the property's market.
MACRS classification per Rev. Proc. 87-56, the asset-class table that determines 5-, 7-, 15-, 27.5-, or 39-year recovery periods.
IRS Cost Segregation Audit Techniques Guide (Pub 5653), the 13-element quality framework.
Form 3115 §481(a) lookback support, via DCN 7.
Reviewed deliverable, Capstan includes a licensed-engineer sign-off; Cost Seg Smart includes internal technical review & QC.

What differs is the buyer-channel and labor model. Capstan's business is built around a 20+ year CPA referral network, the CPA originates the buyer and Capstan executes the engineering. That model is well-suited to $5M+ commercial where the CPA is the trusted advisor and the cost-seg vendor is a downstream specialty engagement. Cost Seg Smart's pipeline is direct-to-investor (with an opt-in CPA partner program), built for properties where automated pricing preserves the Year-1 ROI math.

Where Cost Seg Smart wins

When should I choose Cost Seg Smart over Capstan Tax?

Residential and STR. Capstan's pricing model is built for $5M+ commercial; a $400K STR or $1M SFR doesn't justify their fee. Our $495, $895 entry tier serves a price band Capstan's commercial-priced engagement structurally can't.
Sub-$5M commercial. Office, retail, mixed-use, small warehouse under $5M where the property is well-documented in standard cost databases. Capstan's $5K, $10K minimum consumes too much of the Year-1 benefit at this property scale.
Small multifamily (2, 4 unit and 5, 50 unit non-institutional). Capstan's institutional-MF specialty is the wrong fit for owner-operator multifamily under $5M basis.
Speed-sensitive filings. Under-1-hour turnaround vs Capstan's 4, 8 week engineering engagement. Decisive when the CPA needs the schedule for an extension or for an in-flight return.
Investors without an existing Capstan-affiliated CPA. Capstan's referral model assumes the CPA brings the buyer; for investors whose CPA isn't in that network, Cost Seg Smart is the direct path.

Where Capstan Tax wins

When should I choose Capstan Tax over Cost Seg Smart?

$5M+ commercial with established CPA relationship. If your CPA already works with Capstan and the property is in Capstan's institutional sweet spot, the referral path is the friction-free option, the engineering is wrapped into a relationship the CPA already trusts.
Institutional multifamily. $10M+ apartment complexes, syndicate-owned properties, family-office portfolio engagements where CPA-coordinated specialty-tax work is the standard procurement model.
Properties with specialty FF&E where on-site engineering changes the allocation. Manufacturing-adjacent buildouts, large medical complexes, hospitality at institutional scale, the on-site engineering layer captures details structured-data approaches don't.
20+ year operating history matters to the CPA. Some commercial CPAs require a vendor with documented audit-defense history across their actual client base; Capstan's 2004 founding date is a real trust primitive in that procurement context.

How to decide

Three questions to ask:

Is the property in the $5M+ commercial / institutional-MF range? If yes, Capstan's specialty fit is the right answer. If no (residential, STR, small MF, or sub-$5M commercial), the institutional engagement model is structurally mispriced.
Does your CPA have an existing Capstan relationship? If yes, the path of least resistance is to use the referral. If no, the friction of building a new vendor relationship for one engagement usually doesn't pay off against a direct-to-investor automated alternative.
Does the property have specialty FF&E where on-site engineering changes the allocation? If yes (manufacturing buildout, large medical, institutional hospitality), Capstan's site visit is the deciding factor. If no, our automated pipeline produces the same MACRS allocation.

If you want to see the math on a specific property before deciding, our free calculator gives a Year-1 estimate in 30 seconds. Full methodology details are at /methodology/, pricing tiers at /cheap-cost-segregation/. For CPA-partnership inquiries, see our CPA partner program.

For a wider commercial-firm comparison view, costsegregationreviews.com publishes how commercial-focused firms differ on methodology, useful as an editorial reference rather than a sales path.

Capstan Tax vs. Cost Seg Smart, commercial cost segregation compared.