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Retroactive Cost Segregation: Can It Be Done?

Written by A. Chris Ostler CPA | Jun 19, 2025 11:17:56 AM

Can Cost Segregation Be Applied Retroactively to Previously Constructed  
or Acquired Properties? A Q&A Session 

Introduction 
Cost segregation is a powerful and underutilized strategy for property owners looking to optimize their tax positions. While many assume it only applies to newly acquired assets, it's truly far more flexible and lucrative for properties in any lifecycle stage.  

This blog explores the retroactive application of cost segregation through a practical Q&A format, shedding light on its mechanics, benefits, and considerations.  

Whether you're a real estate investor, business owner, or CPA advising clients, understanding how to leverage past property investments could unlock significant tax savings. 

Q: Could you provide a brief overview of what cost segregation entails? 
A: Certainly. Cost segregation is a tax planning strategy that accelerates depreciation deductions by reclassifying certain components of a property into shorter recovery periods—typically 5, 7, or 15 years—rather than the standard 27.5 or 39-year schedules for residential or commercial real estate. This applies to assets such as fixtures, specialized systems, or land improvements, resulting in enhanced tax savings and improved cash flow in the near term. 

Q: Can cost segregation be applied retroactively to properties acquired or constructed in prior years, or is it limited to newly acquired assets? 
A: It can indeed be applied retroactively. The IRS permits taxpayers to conduct cost segregation studies on properties placed in service in previous tax years, regardless of when they were acquired or built, provided you still own the property and it’s used for business or income-producing purposes. There’s no expiration on eligibility based on the acquisition date. 

Q: How is that feasible if tax returns for those prior years have already been filed? 
A: The IRS facilitates this through a “catch-up” depreciation adjustment. A cost segregation study identifies components eligible for accelerated depreciation from the date the property was placed in service. The additional depreciation that could have been claimed in prior years is then aggregated and deducted in the current tax year. This is accomplished by filing IRS Form 3115 to request a change in accounting method, avoiding the need to amend past returns. 

Q: Are there any limitations or considerations to this approach? 
A: Several factors warrant attention. A comprehensive cost segregation study, conducted by a qualified professional—typically an engineer or tax specialist—is required to substantiate the reclassification, as the IRS demands precision. Additionally, accelerated depreciation may increase recapture tax upon property sale, potentially affecting long-term planning. Finally, engaging a tax advisor is advisable to ensure alignment with your broader financial objectives. The upfront cost of the study should also be evaluated against the projected tax benefits. 

Q: Which property types are eligible for retroactive cost segregation? 
A: Eligibility extends to most income-producing properties, including commercial buildings, residential rental properties, office complexes, hotels, industrial facilities, cannabis growing facilities, public storage facilities, and even leasehold improvements. The property must have been placed in service and remain depreciable, encompassing assets purchased, constructed, or renovated in prior years. 

Q: Could you illustrate this with a practical example? 
A: Consider a commercial property acquired three years ago for $2 million, depreciated over 39 years at approximately $51,282 annually. A cost segregation study determines that $400,000 qualifies for 5-year depreciation and $200,000 for 15-year depreciation. Under the original schedule, $153,846 would have been claimed over three years. With cost segregation, depreciation might total $600,000 by now due to generous bonus depreciation provisions, allowing a catch-up deduction of $446,154 in the current year, significantly reducing taxable income. 

Q: What are the steps to implement this strategy? 
A: Begin by consulting your tax advisor to assess viability. Next, engage a cost segregation specialist to perform a detailed analysis of the property, leveraging acquisition records, blueprints, or site inspections to produce an IRS-compliant report. Your accountant then files Form 3115 with your current tax return to claim the retroactive adjustment. Coordination between professionals ensures compliance and maximizes benefits. 

Q: Are there scenarios where this might not be advantageous? 
A: Yes, certain circumstances may reduce its appeal. If a property sale is imminent, the depreciation recapture could offset some savings. Low current-year income might limit the immediate utility of the deduction, though it can carry forward. Additionally, the cost of the study—often several thousand dollars—must be justified by the anticipated tax relief. For most long-term owners, however, the benefits typically outweigh these considerations. 

Conclusion 
Retroactive cost segregation is a compelling opportunity for real estate owners to recognize substantial tax deductions from past investments. By understanding how to leverage this strategy and working with the right professionals to execute it correctly, taxpayers can realize immediate financial gains without the need to amend prior returns.  

If you’ve owned depreciable property for several years and haven’t yet explored this option, now may be the ideal time to revisit your tax strategy and tap into the hidden value of your real estate assets. 

Please reach out to learn more about cost segregation and how to apply it retroactively, or other tax strategies that may benefit your commercial property.  We are always happy to chat with new and current connections.  

 Schedule a commitment-free meeting today.