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Cost Segregation Quality: What CPAs Should Look For

Feb 2026 2 min read

Last reviewed: 2026-02-26

Quick Summary

A CPA checklist of cost segregation report quality signals, red flags, and due diligence.

Tax law changes over time. RentalWriteOff provides bonus depreciation applicability analysis in every report.

Not all cost segregation reports are created equal. For CPAs, quality is whether the file can withstand scrutiny, not marketing claims.

RentalWriteOff delivers engineering-level documentation depth in a cost segregation documentation package, typically in 2 business days, with a streamlined intake requiring about 5 minutes of client time. CPAs can submit through our Partner Portal, partnership programs are available, and audit support is included with every report we deliver.

For a complete overview of our CPA rollout model, see our white-label residential cost segregation page for accounting firms.

CPA red flags

  • No methodology narrative
  • Basis not reconciled to tax records
  • Aggressive allocations without support
  • Generic schedules that don’t reflect the property
  • No bonus depreciation applicability support
  • No audit support

CPA green flags

  • Clear identifiers and basis framework
  • Specific asset schedule with consistent logic
  • Plain-language methodology
  • Supporting documentation references
  • Bonus depreciation applicability analysis
  • Audit support included

Documenting CPA due diligence

Retain the report, document list, and a brief internal memo noting basis source, placed-in-service facts, and any judgment calls.

Submit through the Partner Portal with a streamlined intake. Reports typically delivered in 2 business days. Audit support included. See our CPA platform page for partnership details and the full workflow overview.