The direct answer

A later study can be useful, but implementation may require an accounting method change rather than simply altering the current schedule. Review prior depreciation, elections, ownership and eligibility. The correction procedure and any catch-up adjustment should be determined by the return preparer.

A practical example

Illustrative example, not a client result: An owner has depreciated a rental for several years. Send the original schedule and filed returns with the study request.

Distinguish an asset deduction from an available tax benefit

A study classifies property components; the tax return determines their treatment and current usability. Reconcile purchase basis, land, separate assets, improvements and service dates before modeling accelerated deductions. Compare study cost and timing benefits with state adjustments and future disposition consequences. The largest identified deduction is not necessarily the best planning outcome.

Put the answer into your own tax file

Start by identifying the taxpayer, the tax year and the actual transaction. Then connect the transaction to the original documents before choosing a return line or moving money between accounts. A payment description can be useful evidence, but it cannot replace the underlying facts.

The records to review for this topic are: Closing statements, land support, existing asset schedules, service-date evidence and the study report.

For the example above, write down the decision that needs to be made, the missing information and the person responsible for supplying it. Keep the business, payroll, property and personal return teams aligned when more than one set of records is affected.

Questions to resolve before implementation

Can I order a cost segregation study several years after buying?

A later study can be useful, but implementation may require an accounting method change rather than simply altering the current schedule. Review prior depreciation, elections, ownership and eligibility. The correction procedure and any catch-up adjustment should be determined by the return preparer.

What should I verify before applying this answer?

Verify the taxpayer, tax year, ownership, actual payments and supporting records. Closing statements, land support, existing asset schedules, service-date evidence and the study report.

Primary sources

Sources checked October 6, 2026. Use the guidance and form instructions for the relevant tax year. This article provides general education; facts and state rules can change the treatment.

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