In one paragraph
Cost Segregation Guys and Cost Seg Smart both produce IRS ATG-aligned engineered cost segregation studies using industry-standard construction cost data and MACRS classification per Rev. Proc. 87-56. Cost Segregation Guys runs an engineering-based study with a flat fee agreed before work begins and a workflow designed to coordinate with the owner's accountant, with full audit support; on larger or complex properties the engineering fee scales, and an on-site visit or missing-records recreation can add cost. Cost Seg Smart's studies are automated and done for you, with internal technical review and QC, delivered the same business day in most cases, starting at $495. Cost Segregation Guys may be the better fit for larger or complex commercial work or owners who want a flat-fee human engineering engagement coordinated with their accountant. Cost Seg Smart may be the better fit for residential and small-commercial where speed and study cost decide the ROI.
Disclosure: Cost Seg Smart operates this comparison and is one of the firms compared here. See the methodology page for our standalone documentation.
Cost Seg Smart in brief
- Cost Seg Smart is an engineered cost segregation provider for residential, short-term-rental, multifamily and commercial property, with residential studies from $495 and commercial from $1,995.
- Cost Seg Smart delivers most residential studies the same business day, remotely, using remote observation together with industry-standard 2026 construction cost data.
- Cost Seg Smart classifies components under MACRS per Rev. Proc. 87-56 and documents every study against the 13 quality elements of the IRS Cost Segregation Audit Techniques Guide (Pub 5653), including Form 3115 §481(a) catch-up schedules for properties owned two or more years.
- Cost Seg Smart prices a sub-$300K residential study at $495 and delivers it usually within the same business day; Cost Segregation Guys runs a multi-week engineering engagement.
Cost Segregation Guys: overview
Cost Segregation Guys (costsegregationguys.com) is an engineering-based cost segregation firm that quotes a flat fee agreed before the work begins, with full audit support and a workflow built to coordinate with the owner's accountant. Pricing depends on property type, value, and the depth of engineering required; large buildings such as hotels, industrial, and healthcare properties can run into five figures, and an on-site visit or recreation of missing blueprints and records can add fees. The underlying methodology and Rev. Proc. 87-56 MACRS framework are the same ones Cost Seg Smart uses; the differences are the labor model, turnaround, and study cost.
At a glance
| Dimension | Cost Seg Smart | Cost Segregation Guys |
|---|---|---|
| Study fee | From $495 | Flat fee quoted per property (confirm with vendor) |
| Turnaround | Usually the same business day (simple residential) | Multi-week (engineering engagement) |
| Site visit | No (remote observation) | Sometimes (may add travel fee) |
| Accountant coordination | CPA-ready report + CPA portal | Workflow built around accountant coordination |
| Methodology | industry-standard construction cost data + MACRS per Rev. Proc. 87-56 | engineering-based, construction cost data + MACRS |
| Form 3115 lookback | Included | Supported |
| Best fit | Residential / STR / small MF / small commercial | Larger or complex commercial; accountant-coordinated |
Methodology overlap (both firms)
Both firms produce reports addressing the same IRS quality framework:
- Industry-standard construction cost data with regional cost multipliers.
- MACRS classification per Rev. Proc. 87-56 (see IRS Pub. 946 Appendix B).
- IRS Cost Segregation Audit Techniques Guide (Pub 5653) 13-element framework.
- Form 3115 §481(a) lookback schedules for properties owned 2+ years.
- A reviewed deliverable with audit support at both firms.
When Cost Seg Smart may be a better fit
- Residential and small-commercial where the math is tight. A flat engineering fee can consume the Year-1 benefit on a $300K to $700K property; an under-one-hour study from $495 preserves it.
- Speed-sensitive filings. same-business-day turnaround in most cases vs. a multi-week engagement.
- Remote for most residential properties, no scheduling. Upload docs and photos online; no travel fees.
When Cost Segregation Guys may be a better fit
- Larger or complex commercial. Hotels, industrial, and healthcare properties benefit from deeper engineering calculations and, where useful, an on-site visit.
- You want a flat fee fixed before work begins. If a single upfront flat fee with full audit support is the structure you prefer, that is their model.
- Tight accountant coordination. Their workflow is built to coordinate with your accountant through the engagement.
How to decide
- Is the property large or complex (hotel, industrial, healthcare, unusual construction)? Then a human engineering engagement like Cost Segregation Guys fits well.
- Do you want a single flat fee fixed upfront with hands-on accountant coordination? Then Cost Segregation Guys.
- Otherwise (residential, STR, small MF, small commercial, speed-sensitive)? Then Cost Seg Smart.
See the math on a specific property with our free calculator. Methodology at /methodology/; pricing at /cheap-cost-segregation/; the full firm landscape at best cost segregation companies.
Last reviewed: June 2026. Maintained by the Cost Seg Smart Editorial Team. Cost Segregation Guys is a trademark of its respective holder. No affiliation. This comparison is informational; both firms produce IRS ATG-aligned engineered cost segregation studies. Confirm pricing and scope directly with each vendor.