What Your CPA Needs from a Cost Segregation Study (The Deliverable Checklist)

You've ordered a cost segregation study — great. But the study is only as useful as the information it delivers to your tax preparer. Many investors hand their CPA a vague percentage breakdown or a bare-bones spreadsheet and expect them to handle the rest. Understanding exactly what a complete study deliverable looks like — and confirming your study provider supplies it — ensures your deductions are filed correctly and protected if examined.

The Two Essential Documents

A complete cost segregation study produces two documents. Both are necessary. Many providers give you one or the other — insist on both.

1. The Narrative Report (PDF format): A written analysis of the property, the methodology used, the basis for each classification decision, and the total dollar allocation by depreciation class. This is your audit defense document. If the IRS examines your return, the narrative report is what justifies the reclassifications. A properly written narrative cites specific IRS authorities — Revenue Procedures, Treasury Regulations, applicable court cases — for each asset classification.
2. The Fixed Asset Schedule (Excel or CSV): A line-item listing of every identified depreciable asset, organized by depreciation class. Each entry includes the asset description, allocated cost basis, placed-in-service date, applicable MACRS class, depreciation method (200% DB, 150% DB, or SL), and convention (half-year or mid-quarter). For retroactive studies, it also includes prior accumulated depreciation and the Section 481(a) adjustment amount.

How Your CPA Uses the Fixed Asset Schedule

The fixed asset schedule is your CPA's primary working document. They enter the asset data into their tax software (Drake, ProSeries, Lacerte, UltraTax), which populates Form 4562 (Depreciation and Amortization) and generates the depreciation deductions on Schedule E or the appropriate business schedule.

For a new study (first-year): the CPA creates new depreciation entries for each asset class with the full basis and placed-in-service date. Bonus depreciation elections are applied to 5-, 7-, and 15-year property automatically if the taxpayer hasn't opted out.

For a retroactive study with Form 3115: the CPA also needs the Section 481(a) adjustment calculation — the total of all missed depreciation from acquisition through the prior tax year. This amount is deducted as a single lump sum in the current year on Form 3115, which is attached to the tax return.

What the Narrative Report Should Contain

The narrative report should be a genuine analytical document, not a cover sheet for the spreadsheet. A complete narrative includes:

• Property description: Address, property type, acquisition date, total purchase price, land allocation, and depreciable basis.
• Scope of the study: What was analyzed, what documentation was reviewed, and the methodology applied.
• Asset classification analysis: For each asset category, an explanation of why the assets qualify for that depreciation life, citing applicable IRS authorities.
• Summary allocation table: The total basis allocated to each MACRS class, expressed in dollars and as a percentage of depreciable basis.
• Methodology description: Which of the IRS ATG-recognized approaches was used and how it was applied to this property.
• Limitations and assumptions: Any assumptions made in the analysis (e.g., estimated furnishings values based on average costs) that the CPA should know about.

Questions to Ask Your Study Provider

1. Do you provide both a narrative PDF report AND an Excel fixed asset schedule?
2. Does the narrative report cite specific IRS authorities (Rev. Proc. 87-56, Treasury Regulations, ATG references) for each asset classification?
3. For retroactive studies: does the schedule include prior accumulated depreciation and the Section 481(a) adjustment calculation?
4. Is the study defensible under the IRS Cost Segregation Audit Techniques Guide methodology standards?
5. Does your team prepare or assist with Form 3115 (if applicable)?
6. How are placed-in-service dates handled for properties purchased mid-year?

Red Flags in a Study Deliverable

• A single-page summary with only percentages and no asset-level detail.
• No narrative report — just a spreadsheet.
• Generic descriptions like "personal property — 20%" without identifying what specific assets comprise that category.
• No citations to IRS authority in the narrative.
• Reclassification percentages that seem implausibly high (>45%) without specific justification for an STR property.
• No mention of the applied methodology or which ATG approach was used.