ASCSP · IRS PUB. 5653 · § 1.168(i)-6 · BENCHMARKS 2026 · n=412
Commercial · CostSeg BENCHMARKS v2.4
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Long-form analysis on commercial cost segregation.

Tax-law analysis, audit-defense methodology, property-class benchmarks, and engineering deep-dives. Written by the team that produces the studies.

MAY 11, 2026

Cost Segregation + 1031 Exchanges: What Resets

Cost-segregated property held in a 1031 exchange chain has a specific recapture and basis treatment most CPAs get half-right. Here's the full picture...

1031 exchangetax strategyrecapture
MAY 11, 2026

Multifamily Cost Seg: 5+ Unit Engineering Specifics

Multifamily reclassification rates (16-20% accelerated) trail commercial because of structural depreciation class — but the cost segregation...

multifamilyproperty typestax strategy
MAY 11, 2026

Pre-Renovation Cost Seg: One Study or Two?

For commercial properties undergoing meaningful renovations, the cost segregation strategy splits into two distinct studies — pre-renovation and...

renovationQIPtax strategycost segregation
MAY 11, 2026

The §163(j) ADS Election Trap on Bonus Depreciation

Real-property trade or business owners who elect out of §163(j)'s interest limitation often don't realize the election permanently forecloses §168(k)...

§163(j)ADSbonus depreciationtax strategy
MAY 10, 2026

Why Medical Office Reclassifies 33% vs Industrial 20%

Across the published Benchmarks 2026 dataset (n=412, 45 per commercial property type), reclassification percentages vary by property class from the...

benchmarksproperty typesreclass
MAY 10, 2026

The Cost Segregation Audit Defense Playbook

What an IRS examination of cost segregation looks like, what documentation defends each component classification, and how engineering studies are...

audit defenseIRSmethodology
MAY 10, 2026

OBBBA 2025: 100% Bonus Depreciation Made Permanent

The One Big Beautiful Bill Act, signed in July 2025, permanently restored 100% bonus depreciation. Here's how it changes the math on commercial cost...

OBBBAbonus depreciationtax strategy