Portfolio across states Cost Segregation: Basis review

Establish the supported cost pool before evaluating component classifications. Resolve separate property reports from state implementation calculations using property-specific records.

Ownership and project scenarios · Published October 9, 2026 · Stratum editorial team

Practical evidence guide. Classification, basis, and usable deductions require property-specific analysis. Scenarios are hypothetical.

The issue this scenario creates

A nationwide study needs property-specific records. State depreciation adjustments belong in the return analysis and should not be assumed identical across locations.

The main objective is to separate property reports from state implementation calculations. A useful analysis makes the ownership and timeline understandable before anyone applies a reclassification estimate. Do not replace missing history with an assumed new purchase or a generic depreciation percentage.

Basis review approach

Basis is a tax starting point, not necessarily current value, borrowed funds, insurance coverage, or the number shown in a listing. The acquisition or transfer history can determine which records are relevant. Give the preparer enough information to establish and adjust the cost pool, then give the provider a reconciliation that can be followed back to those records.

Document the difference between the opening amount and the final study basis. Show land, separately recorded assets, credits, additions, exclusions, and relevant prior treatment. Keep estimates identified. A component analysis cannot repair an unsupported basis simply by allocating the total among many short-lived rows.

Scenario-specific evidence

Start with address inventory, acquisition dates, owner entities, and state filing history. Connect each record to the event it establishes. Explain conflicts and missing years rather than presenting a single unexplained number.

FieldWhat to record
Main questionSeparate property reports from state implementation calculations
Source documentsAddress inventory, acquisition dates, owner entities, and state filing history
Known uncertaintyUsing one federal estimate as the final after-tax result in every state
Event timelineOriginal acquisition or transfer; changes in rental use; additions, removals, and prior filing events.
ReconciliationSupported opening amount, relevant adjustments, land and separate assets, prior treatment, and the cost pool used in the report.

Hypothetical example

An investor buys rentals in Pennsylvania and California during the same year.

The review should guard against using one federal estimate as the final after-tax result in every state. Resolve that concern using the specific records above. The example illustrates a process question, not an available deduction or an actual completed client study.

Question to resolve before closing this task

Can the provider and preparer explain each adjustment from the supported starting basis to the analyzed amount?

Write down the response and retain the supporting record. Assign an owner to any remaining issue and confirm whether it changes the study scope, projected benefit, delivery timeline, or implementation cost. A property report and a usable deduction are separate steps in the workflow.

Practical completion checklist

References and scope

These references explain the underlying tax framework. The checklists and scenarios on this page are editorial tools for gathering evidence, not quotations or asset-specific rulings from the IRS. The audit guide is examination guidance, not an official pronouncement of law or certification of a provider. A return preparer must apply current authority to the particular property, taxpayer, and filing year.

Bring the evidence into a property review

Stratum documents the property. AE Tax Advisors can discuss how a study may fit your broader tax position. Confirm the engagement scope and filing responsibilities before work begins.

Discuss your property with AE Tax Advisors →