Cost Segregation Basics for Rental and Business Property

What a study is designed to analyze

A building purchase or construction project often includes land, structural components, land improvements, equipment, and other costs. A study examines records and property facts to determine whether particular costs belong in different asset classes under federal depreciation rules.

The quality of the classification and allocation matters. The IRS Cost Segregation Audit Technique Guide discusses documentation, methodology, legal framework, and common examination issues, while noting that the guide itself is not an official pronouncement of law.

Documents commonly needed

• Purchase agreement, closing statement, appraisal, and land allocation
• Construction contracts, invoices, change orders, and cost ledgers
• Architectural, engineering, electrical, and mechanical plans
• Placed-in-service dates, occupancy details, and prior depreciation schedules
• Descriptions, photos, and locations of the components being classified

Review the broader tax effects

Accelerating depreciation can shift deductions between years rather than create a cost that did not exist. Passive-activity limits, business losses, basis, interest limitations, state conformity, future sales, and depreciation recapture can affect the practical result.

A study performed after the original placed-in-service year may also raise accounting-method and Form 3115 questions. Coordinate the study with the return preparer before relying on its schedules.