A cost segregation study is an engineering-based analysis that identifies building components eligible for accelerated depreciation. By reclassifying portions of a property from the standard 27.5 or 39-year depreciation schedule to 5, 7, or 15-year categories, investors can dramatically increase their near-term depreciation deductions. When combined with bonus depreciation, cost segregation can generate substantial first-year tax savings that significantly improve after-tax investment returns.
What Is Cost Segregation?
When you purchase a building, the IRS generally requires you to depreciate the entire structure over 27.5 years (residential) or 39 years (commercial). However, not every component of a building has the same useful life. Flooring, cabinetry, appliances, landscaping, parking lots, decorative lighting, and certain electrical and plumbing systems wear out far faster than the building's structural components. A cost segregation study identifies these shorter-lived components and reclassifies them into accelerated depreciation categories, allowing the investor to deduct their cost much sooner.
Eligible Components
A cost segregation study typically reclassifies building components into three shorter recovery periods:
5-Year Property
Includes carpeting, appliances, certain electrical outlets and wiring dedicated to specific equipment, decorative lighting, window treatments, and other personal property items that are not structural components of the building.
7-Year Property
Includes certain furniture, fixtures, and equipment that have a useful life longer than five years but shorter than the building itself. Office furniture, specialized storage systems, and certain security equipment often fall into this category.
15-Year Property
Includes land improvements such as landscaping, parking lots, sidewalks, fencing, drainage systems, and exterior lighting. These items are depreciated over 15 years using the 150% declining balance method.
The Engineering Study Process
A proper cost segregation study is conducted by a team that includes engineers, tax professionals, and construction cost experts. The process involves a detailed review of construction documents, blueprints, and specifications, a physical inspection of the property, identification and quantification of all building components eligible for reclassification, allocation of costs to each component based on engineering estimates and construction cost data, and preparation of a detailed report supporting the reclassifications. The IRS has established guidelines (the Audit Techniques Guide for Cost Segregation) that outline the standards for a quality study. Working with a reputable firm that follows these guidelines is essential to withstand potential IRS scrutiny.
Combining Cost Segregation with Bonus Depreciation
The real power of cost segregation emerges when combined with bonus depreciation. Components reclassified to 5, 7, or 15-year categories are eligible for bonus depreciation, which allows a percentage of their cost to be deducted in the first year. For example, if a cost segregation study on a $5 million property identifies $1.5 million in components eligible for accelerated depreciation, and bonus depreciation is available at 60%, the investor could claim $900,000 in additional first-year deductions. At a 37% tax rate, this represents $333,000 in first-year tax savings — a substantial return on the cost of the study itself, which typically ranges from $5,000 to $25,000.
When Does Cost Segregation Make Sense?
Cost segregation studies are most beneficial for properties with a depreciable basis (building value excluding land) of $750,000 or more. Below this threshold, the cost of the study may not justify the incremental tax savings. Other factors that increase the value of a cost segregation study include high marginal tax rates (the higher your rate, the more each deduction saves), properties with significant interior build-out or specialized improvements, investors who qualify as Real Estate Professionals and can use losses against non-passive income, and properties purchased or placed in service during years with high bonus depreciation rates.
Look-Back Studies for Existing Properties
Investors who purchased properties in prior years without conducting a cost segregation study can still benefit through a look-back study. The IRS allows taxpayers to claim missed depreciation deductions from prior years by filing a change in accounting method (Form 3115). This is a catch-up mechanism that allows the investor to claim all previously missed accelerated depreciation in a single year, without amending prior tax returns. This makes look-back studies particularly valuable for investors who have owned properties for several years and want to recapture the tax benefits they could have claimed from the start.
Choosing a Cost Segregation Provider
The quality of a cost segregation study matters significantly. The IRS has increased scrutiny of cost segregation claims, and poorly prepared studies can trigger audits and disallowed deductions. When selecting a provider, look for firms with licensed engineers on staff, experience with the specific property type, a track record of studies that have withstood IRS review, detailed reports that follow the IRS Audit Techniques Guide, and reasonable fees relative to the expected tax benefit. Avoid firms that guarantee specific results or charge fees based on a percentage of identified deductions, as these practices can create incentives for aggressive reclassifications.
Cost segregation studies are one of the most effective tools for accelerating depreciation deductions and improving the tax efficiency of real estate investments. By reclassifying building components into shorter recovery periods and combining with bonus depreciation, investors can generate substantial near-term tax savings that enhance overall returns. At Fidelis First, we routinely evaluate cost segregation opportunities for our projects, ensuring investors benefit from every available tax advantage. We work with reputable engineering firms to conduct thorough studies that maximize deductions while maintaining full compliance with IRS guidelines.