How to Conduct a Cost Segregation Study for Your Commercial Property

by Kevin Jerry, MST
August 12, 2025

A cost segregation study is a tax strategy that speeds up depreciation deductions for commercial property owners, lowering taxable income and increasing cash flow. By reclassifying parts of the property from long-term (e.g., 39 years) to shorter depreciation periods (e.g., 5, 7, or 15 years), owners can front-load tax savings for reinvestment or paying down debt. This guide covers the steps, costs, benefits, and best practices for conducting a cost segregation study while ensuring IRS compliance.

Understanding Cost Segregation

Cost segregation involves analyzing a property to identify components that qualify for faster depreciation under IRS rules. Typically, commercial properties are depreciated over 39 years, while residential properties use a 27.5-year schedule, both employing the straight-line method. However, personal property (such as carpeting and lighting) and land improvements (like parking lots) qualify for shorter depreciation periods, allowing for larger early deductions. For example, a $2 million property might have $400,000 (20%) reclassified into 5- or 15-year assets, resulting in $80,000–$100,000 in additional first-year deductions, which could save $30,000–$37,000 at a 37% tax rate.

Step-by-Step Guide

1. Assess Eligibility

Not all properties benefit equally. Key factors include:

  • Property Cost: Properties over $1 million (excluding land) tend to produce the best returns because of higher tax savings.
  • Recent Acquisitions or Improvements: Properties purchased or renovated within the last 15 years are ideal. “Look-back” studies allow claiming retroactive deductions.
  • Property Type: Office buildings, retail centers, hotels, and warehouses often have parts that can be reclassified.
  • Tax Situation: Owners with high income or pass-through entities (like LLCs) benefit most.

Action: Talk to a tax advisor to review property costs and tax liability to estimate potential savings.

2. Hire Experts

A high-quality study needs professionals to ensure IRS compliance:

  • Cost Segregation Engineers: Examine building parts and costs.
  • CPAs: Include findings in tax filings.
  • Specialized Firms: Merge engineering and tax knowledge.

Choose providers with:

  • Experience with similar properties.
  • Knowledge of IRS rules (e.g., Cost Segregation Audit Techniques Guide).
  • Clear pricing.

Action: Get proposals from several firms and compare credentials and fees.

3. Analyze Components

Experts break down the property into:

  • Personal Property (5 or 7 Years): Carpeting, lighting, cabinets.
  • Land Improvements (15 Years): Parking lots, landscaping, fencing.
  • Building Structure (27.5 or 39 Years): Walls, roofs, HVAC.
  • Land: Not depreciable.

Using blueprints, invoices, and inspections, specialists assign costs accurately, often using specialized tools and software. For a $3 million property, $600,000 might be classified as 5-year property and $300,000 as 15-year improvements.

Action: Give detailed documentation (blueprints, contracts, invoices) to specialists.

4. Prepare a Detailed Report

The study ends with a report explaining reclassifications, including:

  • Property details and purchase info.
  • Methodology aligned with IRS standards.
  • Asset breakdown with costs and depreciation periods.
  • Supporting documents (e.g., blueprints, photos).

This report is essential for IRS audits.

Action: Review the report with your CPA to ensure accuracy and clarity.

5. File with the IRS

For a property that has been previously depreciated, file IRS Form 3115 to approve the study’s results, enabling:

  • Current-Year Deductions: Use accelerated depreciation.
  • Catch-Up Deductions: Claim previous years’ deductions without filing amended returns.

Action: Work with your CPA to file Form 3115 and maximize deductions.

Costs vs. Benefits

Costs

Studies cost $5,000–$20,000, depending on property size and complexity. Factors include property type, documentation, and retroactive scope.

Benefits

Tax savings often far exceed costs:

  • First-Year Savings: A $1 million property with 20–30% reclassified ($200,000–$300,000) yields $50,000–$75,000 in deductions, saving $18,500–$27,750 at 37%.
  • Catch-Up Deductions: A $2 million property owned for five years could save $55,500–$74,000 retroactively.
  • Cash Flow: Early deductions fund reinvestment or debt reduction.

Example: A $3 million retail center study costing $10,000 reclassifies $600,000 (5-year) and $400,000 (15-year), saving $118,400 in taxes (12:1 ROI).

Considerations

  • Depreciation Recapture: Reclassified assets may face higher taxes (up to 25%) upon sale. 1031 exchanges can mitigate this.
  • Audit Risk: Poor studies increase scrutiny. Reputable specialists reduce risk.
  • Future Deductions: Front-loaded deductions reduce later deductions, impacting long-term planning.

Best Practices

  1. Act Early: Conduct studies post-acquisition or renovation for maximum deductions.
  2. Choose Quality Providers: Select firms with IRS-compliant methodologies.
  3. Integrate with Tax Strategy: Align with 1031 exchanges or other tax plans.
  4. Retain Records: Keep reports and filings for seven years for audits.
  5. Plan for Recapture: Consider long-term ownership or exchanges to minimize tax impacts.

Case Study

A $5 million office building ($4 million depreciable) undergoes a $12,000 study, reclassifying $800,000 (5-year) and $600,000 (15-year). First-year deductions increase from $102,564 to $210,000, saving $39,751 at 37%. A look-back study for a 2020 acquisition could save $148,000 retroactively.

Conclusion

Cost segregation is a powerful tool for owners of commercial properties, enabling tax savings through accelerated depreciation. With professional expertise and IRS compliance, owners can lower taxable income and improve cash flow, making it a valuable strategy for properties valued over $1 million.