How does WeCostSeg coordinate with my CPA?

Every engagement follows the three-touch CPA Coordination Protocol. Preliminary analysis CC'd to your CPA on intake, draft report shared five business days before final delivery, and Form 3115 filing coordinated when a Section 481(a) adjustment applies.

Does OBBBA's 100% bonus apply to my acquisition?

100% applies to property under a binding contract on or after January 20, 2025 per Public Law 119-21. Property under a binding contract on or before January 19, 2025 stays on the legacy phase-down: 40% in 2025, 20% in 2026, 0% in 2027 and after.

Is audit defense included?

Yes. Every WeCostSeg engagement includes five years of written audit defense at no extra charge, aligned to the 13 Principal Elements of a Quality Cost Segregation Study under IRS Publication 5653 Chapter 4.

Can I get a free preliminary analysis?

Yes. Submit property details via the free proposal form or WhatsApp. Engineer-reviewed estimate returned within four business hours during US Eastern hours.

CPA-Led vs Engineer-Led Cost Seg Firms

By Zawwad Ul Sami, Founder, WeCostSegPublished: 2026-05-14Last updated: 2026-05-14

Engineer-led cost seg firms (WeCostSeg, Capstan, KBKG specialty division) lead with the engineering methodology required by IRS Publication 5653 Chapter 3 and 4. CPA-led firms have strong tax expertise but typically subcontract or partner for the engineering work. For substantive cost segregation, engineer-led is the stronger primary credential. CPAs are essential partners for filing but the study itself is engineering work.

Engineering credentials

Pub 5653 Chapter 4 Principal Element #1 is preparer qualifications. The Audit Techniques Guide assumes the preparer is an engineer or qualified professional with construction and component-allocation expertise. CPAs without engineering credentials may not satisfy Element #1 on their own.

Engineer-led firms staff studies with credentialed engineers (PE, ASCSP CCSP, equivalent). The preparer line on the report names the engineer. Audit-defense letters are signed by the engineer.

CPA strengths

CPAs bring tax-return expertise that engineers typically do not have. Form 3115 filing, Section 481(a) adjustment posting, K-1 coordination for partnership-held properties, state-level conformity treatment, NOL absorption planning.

The right model is engineer-led for the study, CPA-coordinated for the return. The WeCostSeg three-touch CPA Coordination Protocol implements this model.

How to choose

For the cost seg study itself: engineer-led. For the tax-return integration: your CPA. The two roles are complementary, not competitive.

If a firm is CPA-led without engineer signature on the report, ask who is doing the engineering and whether that person is named on the deliverable. If a firm is engineer-led without CPA coordination, ask how the Form 3115 integration works.

Frequently asked questions

How does WeCostSeg coordinate with my CPA?: Every engagement follows the three-touch CPA Coordination Protocol. Preliminary analysis CC'd to your CPA on intake, draft report shared five business days before final delivery, and Form 3115 filing coordinated when a Section 481(a) adjustment applies.
Does OBBBA's 100% bonus apply to my acquisition?: 100% applies to property under a binding contract on or after January 20, 2025 per Public Law 119-21. Property under a binding contract on or before January 19, 2025 stays on the legacy phase-down: 40% in 2025, 20% in 2026, 0% in 2027 and after.
Is audit defense included?: Yes. Every WeCostSeg engagement includes five years of written audit defense at no extra charge, aligned to the 13 Principal Elements of a Quality Cost Segregation Study under IRS Publication 5653 Chapter 4.
Can I get a free preliminary analysis?: Yes. Submit property details via the free proposal form or WhatsApp. Engineer-reviewed estimate returned within four business hours during US Eastern hours.

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About the author

Zawwad Ul Sami, Founder

Zawwad Ul Sami is the founder of WeCostSeg, a founder-led cost segregation firm serving real estate investors across the US. He focuses on strategy, pricing, and the firm's overall direction.