Before a cost segregation study reaches a tax return, confirm that it matches the property and give your tax professional the records needed to evaluate it. Resolve any discrepancy before the study is used for filing.
The report supports the tax work. It does not replace the return, the owner's records, or the tax professional's judgment. 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.
Who handles each part of the review
You confirm the property facts
Gather records and flag discrepancies. Start with the report checklist.
Your CPA evaluates the filing treatment
Ask about elections, deduction limits, and how the study fits the return. Prepare the filing questions.
Basis handles questions about the study
Identify what needs explanation or correction in the report. Follow the correction process.
Check the report against your records
Start with facts you can verify. You are not expected to repeat the engineering analysis or decide whether every asset received the right tax classification. Look for incorrect property information, missing work, and amounts that do not match your records.
Use this checklist before sending the study to your tax professional.
Owner and property identity
Compare the taxpayer or entity name with the ownership records and return. Check the address against the closing documents. Flag a different owner, misspelling, mixed use, personal use, or a change in rental use. Leases and reservation records help explain how the property was used.
Dates and starting amounts
Compare acquisition and placed-in-service dates with the closing records and evidence of when the property was ready and available for use. Check purchase price, land, and depreciable basis against the closing statement, prior depreciation schedule, assessor information, or appraisal. Flag any amount that does not match its source.
Improvements and physical facts
Use invoices, contracts, completion records, plans, and photographs to check the work included. Look for omitted improvements, duplicate costs, incorrect dates, or a property feature described incorrectly.
Land is not depreciable, so check the basis and land split carefully. The Basis guide on determining depreciable basis explains records that may support that calculation.
If the study includes later improvements, compare them with actual invoices, dates, and cost categories. The renovation documentation guide can help organize those records.
Property use can affect the building's recovery period. Short-term rental owners should review the 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
Ask your tax professional how they want to receive the study and related records. Group the package so they can find the report, its supporting figures, and anything requiring attention.
Report and tax history
The complete final report with its schedules and appendices.
The current tax depreciation schedule or fixed-asset ledger.
Relevant prior-return information your tax professional does not already have.
Property and cost records
The closing statement and other acquisition-cost records.
Support for the land allocation and depreciable basis.
Renovation invoices with completion or placed-in-service dates.
Changes and open questions
Records describing rental, business, transient, mixed, or personal use.
A list of assets later replaced, removed, or sold.
Any known discrepancy, correction, or unresolved question.
Use your tax professional's approved secure upload method for sensitive records such as tax returns, account numbers, and ownership documents.
A short cover note can identify the property, the tax year under discussion, and any fact that changed after the study intake. Leave the filing treatment for the tax professional to evaluate.
Ask how the study fits the return
The right filing treatment depends on the property's history and the owner's tax situation. A report schedule should not be copied into tax software without that review.
Bring these questions to the discussion:
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 appeared 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 keep 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.
Keep the responsibilities clear
A report correction and a filing decision are different tasks. Basis can investigate whether corrected property facts call for revised report materials. Your tax professional decides how the study applies to the return and prepares or reviews the filing.
The owner should still review the completed return before signing it. IRS guidance on working with a tax professional explains that taxpayers remain responsible for the information on their returns even when a professional prepares them.
Correct discrepancies before filing
A wrong address or date may be easy to identify. A question about an asset classification may require more explanation. Use the same basic process in either case:
Identify the exact property fact, page, schedule, asset line, or assumption in question.
Write down what appears wrong and gather the record that supports the correction.
Ask Basis whether the question requires clarification or revised report materials.
Tell the tax professional that the item is under review before they rely on it.
When the issue is resolved, provide the confirmed final report for filing and label older copies as superseded. Do not edit the report yourself.
A disagreement about the report's source facts differs from a disagreement about tax treatment. Basis can address the study. The tax professional should decide how it applies to the return.
Keep the final records together
After filing, keep the final study with the supporting property records, updated depreciation schedule, relevant filed forms, and written corrections.
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.
Start with the report question
If you or your tax professional has a question about a Basis report, start with the Basis Help Center. Identify the property and the exact fact, asset, assumption, or schedule you want reviewed.
When you are evaluating another property, review the cost segregation study eligibility guide or run a free property estimate before deciding whether to order another study.
© 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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