Before the numbers from a cost segregation study reach a tax return, confirm that the study matches the property, give your tax professional the records needed to evaluate it, and resolve any discrepancies.
The report supports the tax work. It does not replace the return, the owner's records, or the tax professional's judgment. The owner also remains responsible for reviewing the return before signing it.
Cost segregation reports do not follow one required format. The IRS Cost Segregation Audit Technique Guide says there is no standard or prescribed format, though it describes information commonly found in a quality study. Work from the final files you actually received and ask when something is unclear.
Check the report against your records
Start with facts you can verify. You are not expected to repeat the engineering analysis or decide whether each asset received the right tax classification. Your job is to catch incorrect property information, missing work, and numbers that do not match your records.
Use this checklist before sending the study to your tax professional.
| Check | Compare it with | What to note |
|---|---|---|
| Taxpayer or entity name | Ownership records and the tax return that reports the property | Flag a different owner, entity, or spelling |
| Property address and use | Closing records, leases, reservation history, and your own records | Note mixed use, personal use, or a change in rental use |
| Acquisition and placed-in-service dates | Closing documents and records showing when the property was ready and available for use | Record the correct date and the evidence behind it |
| Purchase price, land, and depreciable basis | Closing statement, prior depreciation schedule, assessor information, or appraisal | Identify any amount that does not tie to its source |
| Renovations and later improvements | Invoices, receipts, contracts, and completion records | Note omitted work, duplicate costs, or incorrect dates |
| Physical facts and study scope | Plans, photographs, invoices, and your knowledge of the property | Flag an obvious feature that is missing or described incorrectly |
| Report date and version | The delivery notice and any later correction | Make sure everyone is reviewing the same final version |
Land is not depreciable, so the basis and land split deserve a careful check. The Basis guide on determining depreciable basis explains the records that can support that calculation.
Renovation costs should also trace back to actual documents. If the study includes later work, use the renovation documentation guide to organize invoices, dates, and cost categories.
Property use can affect the building's recovery period. Owners of short-term rentals should review the separate guide on 27.5-year and 39-year depreciation, then give their tax professional the leases, reservation records, and use history needed to evaluate the property.
Build the CPA handoff package
Do not send a screenshot of the summary page and assume it is enough. Ask your tax professional how they want to receive sensitive files, then provide the final study and the records needed to compare it with the existing return and depreciation schedule.
A useful CPA package includes the following items.
The complete final cost segregation report and every schedule or appendix that came with it
The property's current tax depreciation schedule or fixed-asset ledger
The closing statement and other documents supporting the acquisition cost
Records supporting the land allocation and depreciable basis
Renovation and improvement invoices with completion or placed-in-service dates
Records describing rental, business, transient, mixed, or personal use
A list of assets that were later replaced, removed, or sold
Any known discrepancy, correction, or unresolved question
Relevant prior-return information when the tax professional does not already have it
The report date and version so the tax professional can identify the file they reviewed
Use the tax professional's approved secure upload method when the package contains tax returns, account numbers, ownership documents, or other sensitive information. Ordinary email may not be their preferred method.
A short cover note can save a round of questions. Identify the property, the tax year you expect to discuss, the report version, and any fact that changed after the study intake. Do not try to resolve tax treatment in the cover note.
Ask how the study fits the return
The right filing treatment depends on the property's history and the owner's tax situation. Ask questions before assuming that a schedule from the study can be copied directly into tax software.
Bring these questions to the review.
Which taxpayer or entity should report the property?
Does the placed-in-service date match the date used on the return?
Is this the first return reporting the property, or has it already been depreciated on prior returns?
Should Form 4562, Form 3115, or another procedure be considered?
Do federal elections, deduction limitations, or state rules change the timing of the benefit?
How should the fixed-asset ledger and future depreciation schedules be updated?
Does the tax professional need more support for the land allocation, improvements, or property use?
Which final forms and schedules should the owner retain with the study?
For a property first reported in the current tax year, the tax professional may focus on how the study's asset information fits the current return. The Instructions for Form 4562 cover information such as property classification, basis, placed-in-service timing, recovery period, and depreciation deduction.
A property that has already appeared on prior returns raises a different question. Changing an established depreciation treatment may involve an accounting-method procedure, but receiving a cost segregation study does not make Form 3115 automatic. The tax professional should evaluate the facts and current IRS guidance. The Instructions for Form 3115 explain the form's purpose and the information required for depreciation method changes.
Know who handles each question
A good handoff keeps property facts, report questions, and return decisions with the right party.
| Party | What that party should handle |
|---|---|
| Property owner | Confirm property facts, provide complete records, identify later changes, ask questions, and review the return before signing it |
| Basis | Address questions about what appears in the Basis report and investigate whether confirmed property facts call for corrected report materials |
| Tax professional | Evaluate how the study applies to the taxpayer, select the appropriate return treatment with the owner, consider current federal and state rules, and prepare or review the filing |
The tax professional has an important role, but the owner does not hand away responsibility. The IRS states that taxpayers remain responsible for the information on their returns even when a professional prepares them. Review the completed return and ask about anything that does not match the study or your records. IRS guidance on working with a tax professional explains that responsibility.
Correct discrepancies before the study is used
A wrong address or date can be easy to identify. A disagreement about asset classification may require more explanation. In either case, do not alter the report yourself or let different parties work from different versions.
Use this correction process.
Identify the exact page, schedule, asset line, assumption, or property fact in question.
Write down what you believe is wrong and why.
Gather the closing record, invoice, photograph, plan, lease, or other source that supports the correction.
Ask Basis whether the question requires clarification or revised report materials.
Tell the tax professional that the item is being reviewed before they rely on it.
When the question is resolved, give the tax professional the confirmed final version and label older copies as superseded.
A tax-treatment disagreement is different from an incorrect source fact. Basis can address its study. The tax professional should decide how the study is treated on the return. If the two questions overlap, state the disputed fact and the disputed tax treatment separately.
Keep the final records together
After filing, keep the final study with the records used to prepare it and the tax documents that put it into effect. That file should include the final report, supporting basis and improvement records, the updated depreciation schedule, relevant filed forms, and any written correction.
Do not discard the property records when the first return is filed. The IRS generally advises owners to keep records connected to property until the limitations period expires for the year in which the property is disposed of. Those records may still be needed to support depreciation or calculate gain or loss. Review the IRS property-record retention guidance, then ask your tax professional whether your circumstances require a longer period.
Keep one clearly marked final report in the active file. If an earlier version must be retained, label it so nobody mistakes it for the version used on the return.
Get help with the report first
If you or your tax professional has a question about a page, asset, assumption, or schedule in a Basis report, start with the Basis Help Center to find the current support options. Identify the property, report date, report version, and exact item in question. Share sensitive records only through an approved secure method.
Resolve questions about the current study before moving on to another purchase. That follow-through protects the value of the work and gives the tax professional a report they can evaluate without guessing.
Review another property
For another property, begin with the guide on cost segregation study eligibility. You can also run a free property estimate before deciding whether to order another study.
If another owner is preparing for a CPA meeting, share this checklist with them. It gives the owner and tax professional a common list of records, questions, and responsibilities before filing.
© 2026 Basis Cost Seg. For informational purposes only and not tax or legal advice. Tax treatment depends on the property, records, tax year, taxpayer, and current law. Consult a qualified tax professional about your situation.
Further reading
- IRS Cost Segregation Audit Technique Guide IRS examination guidance describing the principal elements of a quality cost segregation study.
- IRS Publication 946, How To Depreciate Property Federal guidance on depreciation methods, property classes, and recovery periods.
- Instructions for Form 4562 Current instructions for reporting depreciation and amortization.
- Instructions for Form 3115 Current instructions for requesting a change in accounting method.
- IRS guidance on keeping property records Federal guidance on retaining records connected with property.
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