When Should You Order a Cost Segregation Study?
Practical guidance for business owners and residential rental investors.
Choose the study date after mapping the transaction
A feasibility discussion before closing can identify records to retain and questions to resolve. The final analysis still needs the actual transaction, supported basis and placed-in-service facts. Ordering after the first rental year introduces prior reporting into the review; ordering before an anticipated sale requires an exit model. Do not select the study date solely because a marketing deadline creates urgency.
Before purchase: preserve options and collect the right facts
Before a purchase closes, ask what records the study provider and preparer will need. Obtain property information, a preliminary financing structure and a list of included furnishings or equipment. The useful output at this stage is a feasibility discussion with explicit assumptions, not a final depreciation schedule. If the transaction involves a related seller, an exchange or an entity-interest purchase, raise that issue before relying on an ordinary asset-purchase illustration.
After closing: replace estimates with transaction evidence
Once the transaction is complete, reconcile the final settlement statement, capitalizable costs, supported land allocation and improvements. Record when the property and later-added assets are ready and available for their intended use. A contract price may differ from the total supported basis, and a building can enter service on a different date from a later furnishing purchase. Provide those differences to the study team before the report is finalized.
After filing: coordinate the procedural review
If depreciation has already been reported, collect the existing schedules before commissioning overlapping work. The preparer must determine whether an accounting method change, an amendment or another correction is appropriate. Preserve elections from the original returns. A new report is evidence for the analysis; it is not permission to replace historical dates or apply today's bonus rules to older acquisitions. If a sale is imminent, review the sale-year procedure and economics first.
Illustrative decision
An investor considering a December acquisition can discuss feasibility in November, collect final closing records in December and separately document when the property becomes ready and available for rent. Paying the study invoice in December does not establish the rental's depreciation start date or settle which tax year receives a deduction.
Records and decisions to prepare
- Map contract, closing and placed-in-service dates
- Ask which facts must be final before analysis
- Identify whether a return has already been filed
- Coordinate the study with the preparer and any planned sale
Primary references for this decision:
- IRS cost segregation audit technique guide
- IRS Publication 946: depreciation methods and eligibility
- IRS Publication 551: basis of assets
Examples illustrate decisions, not guaranteed outcomes. Apply the rules for the relevant tax year and review the underlying facts before filing.
Cost segregation decisions · Browse owner tax decisions · Editorial standards
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