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Cost segregation FAQs: understand the study, the assumptions and the work your CPA needs before putting deductions on a return.

Before you commission a study

Start with the property. Finish with the tax facts.

A useful analysis connects engineering evidence with your basis, timing and ability to use deductions.

What does a cost segregation study do?

It identifies and documents components of a depreciable property that may qualify for shorter recovery periods than the building. It changes the timing of depreciation; it does not make land depreciable or automatically create a permanent tax saving.

Which properties should be reviewed?

Income-producing residential rental and commercial properties may warrant review, including acquisitions and improvements. Property basis, component mix, service dates, ownership plans and usable tax benefits determine whether a study makes economic sense. There is no universal purchase-price threshold that guarantees value.

How much does a cost segregation study cost?

Request a written property-specific quote. Scope depends on property complexity, available records, site work, asset detail and the support included. Compare deliverables, CPA coordination, revision terms and examination support along with the fee. The calculator excludes fees and does not quote a study price.

Is 100% bonus depreciation automatic?

No. Current law restored 100% bonus for qualifying property acquired and placed in service after January 19, 2025. Asset eligibility, written binding contracts, related-party acquisitions, required alternative depreciation and elections can change the answer. The building itself generally does not qualify merely because some components do. Have your CPA verify the facts before relying on a scenario.

Can I use the entire deduction this year?

That depends on your tax situation. Basis, at-risk, passive activity and excess business loss rules may limit or defer deductions. A short-term rental label alone does not establish material participation or usable losses. Multiplying a deduction by a tax rate illustrates a potential effect only when the deduction is actually usable.

Can a study cover property I bought in an earlier year?

Potentially. Review the original basis, depreciation history, prior elections and any dispositions first. Depending on the facts, implementation may involve an accounting method change and a §481(a) adjustment, an amended return or another procedure. Your tax preparer determines the available filing route and deadlines. Our online calculator does not calculate a historical catch-up adjustment.

What documents should I gather?

Start with the closing statement, purchase agreement, supported land allocation, depreciation schedules, prior study, construction or renovation invoices, plans and placed-in-service evidence. Identify removed assets and planned sales. Your reviewer can then identify missing records and the scope of additional property analysis.

How long does a study take?

Timing depends on document readiness, property complexity and the agreed scope. Confirm a delivery date and CPA review window before engagement, especially near a filing deadline. A completed engineering report and a correctly implemented tax return are separate steps.

Does the study replace my CPA or guarantee IRS acceptance?

No. A study supports classifications and allocations; your CPA evaluates tax eligibility, elections, limitations and return implementation. Ask what evidence and examination assistance are included in the engagement. No study guarantees acceptance of a tax position.

What about renovations and replaced building components?

Repair-versus-improvement analysis and partial asset dispositions are related but distinct reviews. Preserve invoices, the work's purpose, before-and-after records and retirement dates. A replacement does not automatically create a deductible repair or a disposition loss. Read our tangible property regulations guide for the questions to take to your CPA.

Reviewed September 11, 2026. References: IRS Publication 946, Notice 2026-11, and Publication 925. This guide is educational; individual facts determine tax treatment.