Related-party purchase Cost Segregation: Document checklist

Gather the records that resolve the scenario rather than uploading an unstructured folder. Resolve document transaction relationships and acquisition history before estimating bonus benefits 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

Related-party rules can affect bonus eligibility and other treatment. The study should document physical components without promising that every acquired asset receives bonus depreciation.

The main objective is to document transaction relationships and acquisition history before estimating bonus benefits. 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.

Document checklist approach

Organize original records by property, event, and date. Give the reviewer a short narrative of what happened and an index connecting each material cost to its supporting document. Identify missing information and the person most likely to provide it. A complete-looking folder can still omit the one record that establishes ownership, allocation, or timing.

Keep purchase and transfer documents, improvement evidence, prior tax schedules, and operating records separately labeled. Use a secure sharing process and exclude unnecessary private information. A bookkeeper, manager, contractor, or prior preparer can each hold part of the evidence. Ask for source records rather than relying only on their summary labels.

Scenario-specific evidence

Start with purchase contract, relationship description, prior ownership dates, and price allocation. Connect each record to the event it establishes. Explain conflicts and missing years rather than presenting a single unexplained number.

FieldWhat to record
Main questionDocument transaction relationships and acquisition history before estimating bonus benefits
Source documentsPurchase contract, relationship description, prior ownership dates, and price allocation
Known uncertaintyAssuming that an engineering classification proves bonus eligibility
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

A business owner buys a rental house from an entity controlled by a family member.

The review should guard against assuming that an engineering classification proves bonus eligibility. 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

Which source record is still missing, who holds it, and what decision depends on obtaining it?

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 →