Cost Segregation Study: Accelerate Depreciation and Reduce Your Tax Burden

What Is a Cost Segregation Study?

A cost segregation study is an engineering-based tax strategy that identifies and reclassifies components of a building from long-life real property into shorter-life personal property and land improvement categories. Under the Internal Revenue Code (IRC) Section 168, buildings are generally depreciated over 27.5 years (residential rental property) or 39 years (nonresidential real property). However, many individual components within those buildings, such as specialized electrical systems, decorative finishes, cabinetry, and site improvements, actually qualify for much faster depreciation schedules of 5, 7, or 15 years.

The IRS has long recognized cost segregation as a legitimate and powerful tax planning tool. In fact, the IRS published its own Cost Segregation Audit Techniques Guide (ATG) to help revenue agents evaluate these studies, effectively validating the methodology. When performed correctly by qualified professionals, a cost segregation study provides audit-ready documentation that supports every reclassification with engineering rationale and legal authority.

The core principle is straightforward. When you purchase or construct a building, you are not acquiring a single asset. You are acquiring hundreds of individual components: plumbing fixtures, floor coverings, cabinetry, landscaping, parking surfaces, specialized wiring, security systems, and more. Each of these components has its own useful life as defined by the IRS Modified Accelerated Cost Recovery System (MACRS). A cost segregation study separates these components from the building shell and assigns each one to the correct asset class and recovery period, allowing you to deduct their cost over the appropriate, shorter timeframe.

The financial impact can be substantial. By front-loading depreciation deductions into the early years of property ownership, cost segregation reduces your current taxable income and generates immediate cash flow benefits. For investors in higher tax brackets, the present value of these accelerated deductions can represent a significant return on the cost of the study itself. Learn more about how this fits into a comprehensive approach on our real estate tax planning page.

How Cost Segregation Works Under IRC Section 168

The legal foundation for cost segregation rests on IRC Section 168, which governs the Accelerated Cost Recovery System (ACRS) and its successor, the Modified Accelerated Cost Recovery System (MACRS). Under MACRS, every depreciable asset is assigned to a specific property class with a designated recovery period. The key classes relevant to cost segregation are:

5-Year Property (IRC Section 168(e)(3)(B))

This class includes assets that are considered personal property or tangible property not permanently attached to the building structure. Examples include appliances (refrigerators, ranges, dishwashers, washers, dryers), carpeting and area rugs, window treatments such as blinds and curtains, certain decorative fixtures and lighting, specialized electrical outlets and circuits serving specific equipment, and security or monitoring equipment. In residential rental properties, these items often represent 10% to 15% of the total building cost.

7-Year Property (IRC Section 168(e)(3)(C))

This category covers furniture, fixtures, and equipment with slightly longer useful lives. It includes built-in shelving and cabinetry (when removable or decorative rather than structural), office furniture in commercial properties, specialized equipment, and certain types of signage. The 7-year class typically captures 3% to 8% of a building's cost, depending on the property type and level of interior buildout.

15-Year Property (IRC Section 168(e)(3)(E))

Land improvements fall into this class. These are assets that improve the land surrounding the building but are not part of the building structure itself. Landscaping, sidewalks, driveways, parking lots, retaining walls, fencing, outdoor lighting, irrigation systems, and stormwater drainage systems all qualify. For properties with significant exterior improvements, this category can represent 5% to 15% of the total acquisition cost.

27.5-Year and 39-Year Property (Structural Components)

Everything that cannot be reclassified into a shorter recovery period remains in the building shell category. Structural framing, exterior walls, roofing, foundation, primary HVAC distribution, main electrical service, and primary plumbing lines generally stay in these long-life categories. The goal of a cost segregation study is to minimize the amount that remains in these slow-depreciation classes while maximizing the reclassified components within the bounds of IRS guidelines.

Our team at AE Tax Advisors works with experienced engineers and tax attorneys, including Mike Zara (Business Attorney) and Jacob Simany (Tax Attorney), to ensure every reclassification is defensible and supported by both engineering analysis and legal precedent.

Who Qualifies for a Cost Segregation Study?

Cost segregation is available to any taxpayer who owns depreciable real property used in a trade, business, or income-producing activity. This includes a wide range of property types and ownership structures.

Property Types That Benefit from Cost Segregation

• Residential rental properties: Single-family rentals, duplexes, triplexes, and fourplexes depreciated over 27.5 years under IRC Section 168(c). Visit our rental property tax planning page for more on optimizing rental property deductions.
• Short-term rental properties: Airbnb, VRBO, and other properties with average rental periods of 7 days or less. STRs offer unique advantages when combined with cost segregation because of the material participation rules under IRC Section 469. Explore our short-term rental tax strategy page for details.
• Multi-family apartment buildings: Properties with 5 or more units, which often yield substantial reclassification amounts due to repeated component sets across units.
• Commercial properties: Office buildings, retail spaces, warehouses, and industrial facilities depreciated over 39 years, where the longer baseline recovery period creates even greater acceleration benefits.
• Mixed-use properties: Buildings that combine residential and commercial use require careful allocation but frequently produce strong cost segregation results.
• Hotels and hospitality: High levels of furniture, fixtures, and equipment (FF&E) make these properties especially well suited for reclassification.
• Self-storage facilities: Significant land improvements and specialized interior components create meaningful cost segregation opportunities.
• Restaurants and food service: Specialized kitchen equipment, ventilation systems, and interior buildouts produce high reclassification percentages.

Property Acquisition Scenarios

Cost segregation applies regardless of how you acquired the property:

• Newly constructed properties: Ideal candidates because detailed construction cost records are available, making component identification straightforward.
• Purchased existing properties: The study allocates the purchase price among components using engineering estimates and comparable cost data.
• Renovated or improved properties: Capital improvements to existing properties can be studied independently, and the improvement costs can be reclassified into shorter-life categories.
• 1031 exchange properties: Properties acquired through like-kind exchanges under IRC Section 1031 are eligible, though special rules apply to basis allocation between the exchanged and new components.

Minimum Property Value Considerations

While there is no legal minimum property value for a cost segregation study, the economics generally favor properties valued at $300,000 or more. At this threshold, the tax savings from accelerated depreciation typically exceed the cost of the study, producing a positive return on investment. Properties valued above $500,000 tend to generate returns of 5x to 10x the study cost or more. Our real estate investor CPA team evaluates each property individually to confirm that a study makes financial sense before proceeding.

The Cost Segregation Process: Step by Step

A properly conducted cost segregation study follows a rigorous, multi-phase process that satisfies IRS requirements and produces an audit-ready deliverable. At AE Tax Advisors, our process includes the following stages:

Step 1: Feasibility Analysis

Before committing to a full study, our team reviews the property details, purchase price, date placed in service, and your current tax situation to determine whether cost segregation will produce a meaningful benefit. This preliminary analysis is provided at no additional cost as part of our advisory engagement. We estimate the potential reclassification percentage, project the tax savings, and confirm that the expected return justifies the study.

Step 2: Data Collection and Document Review

We gather all available documentation related to the property, including closing statements (HUD-1 or CD), appraisals, construction invoices, architectural drawings, site plans, inspection reports, and photographs. For purchased properties where original construction records are unavailable, our engineers use industry-standard cost estimation databases and comparable property analysis to allocate costs among components.

Step 3: Engineering-Based Analysis

This is the core of the study. Our engineering team conducts a detailed analysis of every building component, classifying each element into the appropriate MACRS asset class based on its function, attachment method, and relationship to the building structure. The analysis follows the IRS Cost Segregation ATG methodology and considers factors such as whether a component is permanently affixed, whether it serves the building's general operation or a specific business function, and whether removal would cause damage to the structure.

Step 4: Site Visit or Detailed Photo Review

For properties where physical inspection adds value, a site visit is conducted to verify component classifications and identify items that may not appear in construction documents. For properties where travel is impractical or the documentation is sufficiently detailed, a thorough photo and video review serves as an alternative. The IRS ATG recognizes both approaches as acceptable when properly documented.

Step 5: Report Generation

We produce a comprehensive, multi-section report that includes an executive summary, detailed asset classification schedules, depreciation calculations, engineering rationale for each reclassification, supporting legal citations (IRC sections, Treasury Regulations, Revenue Rulings, and relevant case law), and a summary of the tax impact. This report is designed to withstand IRS scrutiny and serves as the foundation for the depreciation deductions claimed on your tax return.

Step 6: Tax Return Integration

The final step is incorporating the cost segregation results into your federal and state tax returns. For properties placed in service in the current year, the reclassified depreciation is reflected directly on Form 4562 (Depreciation and Amortization). For properties already in service from prior years, we file Form 3115 to claim the catch-up adjustment. Christina Nortman, our Operations Manager, coordinates the timeline to ensure seamless integration with your filing deadlines.

Typical Savings by Property Type

The percentage of a building's cost that can be reclassified into shorter recovery periods varies by property type, construction quality, age, and level of interior and exterior improvements. Based on our experience conducting hundreds of cost segregation studies, the following ranges are representative:

Residential Rental Properties (27.5-Year Baseline)

For single-family and small multi-family rental properties, typically 20% to 35% of the depreciable basis can be reclassified. The primary reclassification targets include appliances, carpeting, window coverings, cabinetry, landscaping, driveways, fencing, and specialized electrical or plumbing serving specific fixtures. On an $800,000 property with a depreciable basis of approximately $680,000 (after land allocation), reclassifying 30% would yield $204,000 in accelerated depreciation. With 100% bonus depreciation, this creates a first-year deduction of $204,000 instead of spreading that amount over 27.5 years.

Short-Term Rental Properties

STR properties often have higher reclassification percentages, typically 25% to 40%, because of the additional furnishings, hospitality equipment, linens, kitchenware, and entertainment systems that qualify as personal property. STRs classified under IRC Section 168(e)(2)(B) use a 39-year nonresidential recovery period for the structural components, which makes the acceleration benefit even more pronounced. Combined with the IRC Section 469 material participation rules for STRs with average rental periods of 7 days or less, cost segregation on an STR can produce deductions that offset active income. See our STR tax strategy page for more on this powerful combination.

Commercial Office and Retail Properties (39-Year Baseline)

Commercial properties typically yield reclassification rates of 15% to 30%. The longer 39-year baseline means that even modest reclassification percentages produce significant acceleration. Tenant improvements, specialized HVAC zones, decorative lighting, built-in display fixtures, and exterior site work are common reclassification targets.

Multi-Family Apartment Buildings

Large apartment complexes can see 25% to 40% reclassification rates because identical component sets are repeated across every unit. Appliances, flooring, cabinetry, bathroom fixtures, and individual unit electrical panels multiply across dozens or hundreds of units, creating substantial aggregate reclassification amounts.

Hotels, Restaurants, and Hospitality

These property types often achieve the highest reclassification rates, sometimes 30% to 45%, due to the heavy concentration of furniture, fixtures, equipment, specialized kitchen and food service installations, and decorative finishes that qualify as personal property.

100% Bonus Depreciation Under OBBBA and IRC Section 168(k)

The One Big Beautiful Bill Act (OBBBA) made 100% bonus depreciation permanent under IRC Section 168(k). This is a transformative development for cost segregation planning. Under prior law (the Tax Cuts and Jobs Act of 2017), bonus depreciation was set to phase down from 100% beginning in 2023, dropping by 20 percentage points per year until it reached 0% in 2027. The OBBBA reversed this phase-down and restored 100% bonus depreciation with no expiration date.

What This Means for Cost Segregation

With permanent 100% bonus depreciation, every dollar of building cost that a cost segregation study reclassifies into 5-year, 7-year, or 15-year property can be fully deducted in the year the property is placed in service. This eliminates the need to spread deductions over the recovery period and concentrates the entire tax benefit into a single year. For a property where $250,000 of components are reclassified, the taxpayer receives a $250,000 depreciation deduction in Year 1, compared to roughly $9,090 per year under 27.5-year straight-line depreciation.

Retroactive Application

The OBBBA's restoration of 100% bonus depreciation applies retroactively to property placed in service after December 31, 2022. This means that investors who placed properties in service during 2023, 2024, or 2025 and claimed reduced bonus depreciation (80%, 60%, or 40%) may be entitled to file amended returns or Form 3115 to claim the additional depreciation they missed. Our blog covers the latest updates on how to take advantage of these retroactive provisions.

Eligible Property

Bonus depreciation under IRC Section 168(k) applies to property with a recovery period of 20 years or less, certain computer software, qualified film and television productions, and qualified improvement property (QIP). For cost segregation purposes, this means all reclassified 5-year, 7-year, and 15-year property qualifies for the full 100% first-year deduction. The only reclassified asset class that does not benefit from bonus depreciation is land, which is not depreciable.

Form 3115: Catch-Up Depreciation for Properties Already in Service

One of the most powerful applications of cost segregation is claiming accelerated depreciation on properties that were placed in service in prior years. Many property owners assume that if they did not perform a cost segregation study in the year of acquisition, the opportunity is lost. That is not the case.

The IRC Section 481(a) Adjustment

Under IRC Section 481(a), taxpayers can change their method of accounting for depreciation by filing Form 3115 (Application for Change in Accounting Method). This filing creates a "catch-up" adjustment that captures all of the depreciation that would have been claimed in prior years had the cost segregation study been performed at the time of acquisition. The entire cumulative adjustment is taken as a deduction in the year of the change, producing a single large deduction without the need to amend prior-year returns.

How It Works in Practice

Consider a property purchased five years ago for $600,000 (depreciable basis). Without cost segregation, the owner has been claiming straight-line depreciation of approximately $21,818 per year on the full basis. A cost segregation study determines that $180,000 of the basis qualifies for 5-year recovery. Under the accelerated method, all $180,000 would have been deducted in the first five years (or in Year 1 with bonus depreciation). The Section 481(a) adjustment equals the difference between the depreciation that should have been claimed under the new method and the depreciation that was actually claimed. This difference becomes a deduction in the current year.

No Amended Returns Required

A critical advantage of the Form 3115 approach is that it does not require filing amended returns for any prior tax year. The IRS specifically designed this mechanism to allow taxpayers to correct their depreciation method on a prospective basis. The entire catch-up amount flows through the current-year return, simplifying the filing process and avoiding the complexity of reopening prior years. For investors who need amendment services for other issues, we offer that separately at $2,500 per year as part of our pricing structure.

Asset Classes: What Gets Reclassified in a Cost Segregation Study

Understanding which building components can be reclassified is essential for evaluating the potential benefit of a cost segregation study. The following is a detailed breakdown of common reclassification targets organized by MACRS recovery period.

5-Year Personal Property (MACRS Class 00.11, 57.0)

• Kitchen appliances: refrigerators, ranges, ovens, dishwashers, microwaves, garbage disposals
• Laundry appliances: washers, dryers, combination units
• Carpeting and removable floor coverings
• Window treatments: blinds, shades, curtains, drapery hardware
• Decorative light fixtures and accent lighting
• Specialized electrical circuits serving specific equipment (dedicated outlets for appliances, data, or AV systems)
• Security systems: cameras, alarm panels, motion sensors, wiring
• Removable cabinetry and countertops (when not integral to the building structure)
• Water heaters (standalone units)
• Ceiling fans
• Storm doors and removable screen assemblies

7-Year Personal Property (MACRS Class 00.11)

• Furniture: beds, dressers, tables, chairs, desks, sofas (particularly relevant for furnished rentals and STRs)
• Built-in bookshelves and entertainment centers
• Artwork and decorative accessories (when treated as depreciable business property)
• Specialized signage and wayfinding systems
• Kitchen and bath accessories: towel bars, toilet paper holders, soap dispensers, mirrors
• Office equipment in commercial properties

15-Year Land Improvements (MACRS Class 00.3)

• Landscaping: sod, plantings, trees, shrubs, mulch beds, decorative stone
• Driveways and parking areas: asphalt, concrete, gravel surfaces
• Sidewalks, walkways, and pathways
• Retaining walls (not supporting the building structure)
• Fencing: wood, vinyl, chain-link, wrought iron, privacy screens
• Outdoor lighting: parking lot lights, pathway lights, landscape lighting
• Irrigation and sprinkler systems
• Swimming pools, hot tubs, and related equipment
• Patios, decks, and outdoor entertainment areas (when not attached to the building structure)
• Stormwater drainage systems: catch basins, culverts, retention features
• Septic systems and leach fields
• Mailbox structures and utility hookup infrastructure at the site boundary

The exact classification of each component depends on the specific facts and circumstances of the property. Our engineering analysis evaluates each item based on IRS guidance, Treasury Regulations, and relevant case law to ensure proper classification.

Cost Segregation Case Studies: Real Results

The following examples illustrate the impact of cost segregation studies performed by AE Tax Advisors. All identifying details have been removed to protect client confidentiality. For additional examples, visit our case studies page.

Example 1: 4-Unit Residential Rental Property

A real estate investor purchased a 4-unit residential property for $800,000. After allocating $120,000 to land, the depreciable basis was $680,000. Without cost segregation, the annual depreciation deduction would have been approximately $24,727 per year over 27.5 years.

Our cost segregation study identified:

• 5-year personal property: $88,400 (13% of depreciable basis), including appliances across all four units, carpeting, window treatments, ceiling fans, and dedicated electrical circuits
• 7-year personal property: $34,000 (5% of depreciable basis), including built-in cabinetry and bathroom accessories
• 15-year land improvements: $68,000 (10% of depreciable basis), including the parking area, landscaping, fencing, sidewalks, and outdoor lighting

Total reclassified: $190,400 (28% of depreciable basis). With 100% bonus depreciation, the investor claimed a first-year depreciation deduction of $190,400 on the reclassified components, plus $17,803 of straight-line depreciation on the remaining $489,600 of 27.5-year property. The total first-year deduction was $208,203, compared to $24,727 without cost segregation. At a combined federal and state marginal tax rate of 37%, this produced approximately $67,886 in first-year tax savings.

Example 2: Short-Term Rental (Airbnb) Property

An investor purchased a furnished vacation rental for $550,000 in a resort market, with $82,500 allocated to land. The depreciable basis was $467,500. Because the average rental period was under 7 days and the investor materially participated in the rental activity, the property qualified for non-passive treatment under IRC Section 469.

Our cost segregation study reclassified:

• 5-year personal property: $93,500 (20% of depreciable basis), including furnishings, kitchen equipment, linens, electronics, entertainment systems, and decorative fixtures
• 7-year personal property: $23,375 (5% of depreciable basis), including custom built-in furniture and specialized storage
• 15-year land improvements: $46,750 (10% of depreciable basis), including the driveway, landscaping, pool and hot tub, deck, and outdoor entertainment area

Total reclassified: $163,625 (35% of depreciable basis). Because the STR qualified for non-passive treatment, the $163,625 first-year bonus depreciation deduction could offset the investor's W-2 income and active business income. At a 37% combined rate, this generated $60,541 in tax savings against the investor's other income sources.

Example 3: Commercial Office Building (Form 3115 Catch-Up)

A business owner had purchased a 10,000 sq. ft. office building seven years earlier for $1,200,000, with $200,000 allocated to land. The depreciable basis was $1,000,000. Over seven years, the owner had claimed straight-line depreciation of $25,641 per year (39-year recovery), totaling $179,487 in cumulative depreciation.

A cost segregation study determined that $280,000 of the basis should have been classified as 5-year, 7-year, or 15-year property. Under the corrected depreciation method, cumulative depreciation through Year 7 would have been $434,200 (including the bonus depreciation on the reclassified components and straight-line depreciation on the remaining 39-year property). The Section 481(a) catch-up adjustment was $254,713 ($434,200 minus $179,487). This entire amount was claimed as a deduction on the current-year return via Form 3115, generating $94,244 in tax savings at a 37% combined rate, all without amending a single prior-year return.

Common Misconceptions About Cost Segregation

Despite its proven benefits and IRS endorsement, several misconceptions persist about cost segregation studies. Understanding the facts helps investors make informed decisions.

Misconception 1: "Cost segregation triggers audits."

There is no evidence that filing a properly conducted cost segregation study increases audit risk. The IRS specifically recognizes cost segregation as a legitimate tax strategy and has published detailed guidance (the Cost Segregation ATG) to help revenue agents evaluate these studies. A well-documented study actually provides audit protection by creating a comprehensive record of the engineering rationale and legal authority supporting each reclassification.

Misconception 2: "You can only do cost segregation in the year of purchase."

As discussed in the Form 3115 section above, cost segregation can be applied to properties placed in service in any prior year. The catch-up mechanism under IRC Section 481(a) allows the full cumulative benefit to be claimed in a single year without amending prior returns.

Misconception 3: "Cost segregation only benefits large commercial properties."

While commercial properties with higher values naturally produce larger dollar-amount savings, residential rental properties and STRs valued at $300,000 or more consistently generate positive returns from cost segregation. The reclassification percentages for residential properties are often comparable to or even higher than commercial properties due to the relatively high concentration of personal property components like appliances, flooring, and cabinetry.

Misconception 4: "The depreciation you accelerate just gets recaptured when you sell."

While depreciation recapture is a real consideration (see below), this argument overlooks several important factors. First, the time value of money means that a deduction today is worth more than a tax payment in the future. Second, the recapture rate on personal property under IRC Section 1245 is at ordinary income rates, but this is the same rate you would have paid anyway since depreciation always reduces ordinary income. Third, strategic use of IRC Section 1031 like-kind exchanges can defer recapture indefinitely. Fourth, for properties held until death, the step-up in basis under IRC Section 1014 can eliminate recapture entirely.

Misconception 5: "A DIY cost segregation approach is just as effective."

The IRS has explicitly stated that cost segregation studies should be performed by individuals with expertise in both engineering and tax law. Studies that lack proper engineering methodology, fail to cite legal authority, or use unsupported reclassification percentages are vulnerable to challenge. The IRS ATG identifies specific "red flags" that agents look for, including studies that use a simple percentage allocation rather than a component-by-component analysis. Working with a qualified firm like AE Tax Advisors ensures your study meets all IRS standards.

Depreciation Recapture: Understanding IRC Sections 1245 and 1250

When you sell a property that has benefited from cost segregation, the accelerated depreciation deductions are subject to recapture rules. Understanding these rules is essential for long-term tax planning.

IRC Section 1245 Recapture (Personal Property)

Depreciation claimed on 5-year and 7-year personal property is recaptured as ordinary income under IRC Section 1245 when the property is sold. This means the gain attributable to depreciation previously deducted on these components is taxed at your ordinary income tax rate rather than the lower capital gains rate. However, this recapture only applies to the extent of the depreciation actually claimed; any gain above the original cost basis is treated as capital gain.

IRC Section 1250 Recapture (Real Property and Land Improvements)

Depreciation on 15-year land improvements and the remaining 27.5/39-year building components is subject to "unrecaptured Section 1250 gain," which is taxed at a maximum rate of 25%. This rate applies to the extent of straight-line depreciation claimed on real property. Because cost segregation does not change the total amount of depreciation eventually claimed on these components (it only accelerates the timing), the recapture treatment is the same whether or not a cost segregation study was performed.

Strategies to Mitigate Recapture

• IRC Section 1031 Like-Kind Exchanges: By exchanging the property for another qualifying property, both capital gains and depreciation recapture are deferred. Investors who continually exchange properties can defer recapture indefinitely.
• Step-Up in Basis at Death (IRC Section 1014): When property passes to heirs, the tax basis is stepped up to fair market value, eliminating all unrealized gain and depreciation recapture.
• Installment Sales (IRC Section 453): Spreading the gain over multiple years through seller financing can help manage the tax impact of recapture.
• Opportunity Zone Investments (IRC Section 1400Z): Reinvesting gains into qualified opportunity zone funds can defer and partially reduce capital gains tax.

Our tax attorneys, including Jacob Simany, work with each client to develop an exit strategy that accounts for depreciation recapture and minimizes the overall tax burden at disposition. Learn more about our comprehensive approach on our CPA for real estate investors page.

Why Choose AE Tax Advisors for Your Cost Segregation Study

Choosing the right firm for your cost segregation study matters. The quality of the analysis, the defensibility of the report, and the integration with your overall tax strategy all depend on the expertise and approach of your advisory team. Here is what sets AE Tax Advisors apart.

Integrated Tax Strategy, Not Just a Report

Many firms offer cost segregation as a standalone service: they produce a report and hand it off. At AE Tax Advisors, cost segregation is one component of a comprehensive tax strategy that considers your entire financial picture. We evaluate how cost segregation interacts with your entity structure, passive activity rules, state tax obligations, exit planning, and long-term wealth building goals. This integrated approach ensures that accelerated depreciation creates the maximum benefit within your specific circumstances.

In-House Legal and Tax Expertise

Our team includes Mike Zara (Business Attorney) and Jacob Simany (Tax Attorney), who review every cost segregation study for legal defensibility and IRC compliance. This dual layer of review ensures that reclassifications are supported by current legal authority, including Treasury Regulations, Revenue Rulings, Revenue Procedures, and relevant Tax Court decisions.

Operational Excellence

Christina Nortman, our Operations Manager, coordinates every engagement to ensure timelines are met, documentation is complete, and the study integrates seamlessly with your tax return filing. From the initial feasibility analysis through the final tax return submission, our process is designed for efficiency and accuracy.

Audit-Ready Documentation

Every cost segregation study we produce follows the IRS Cost Segregation ATG methodology. Our reports include detailed component schedules, engineering rationale, legal citations, photographic documentation, and depreciation calculations. In the event of an IRS inquiry, our reports serve as comprehensive supporting documentation for every deduction claimed.

Transparent Pricing

Cost segregation studies are priced at $1 per square foot with a $2,000 minimum -- straightforward, predictable, and competitive. This standalone pricing covers the full engineering-based analysis, component classification, Form 3115 catch-up calculation, and delivery of a complete audit-ready report. Our broader advisory engagement is $7,800 per year, which includes tax planning, strategy, and compliance. Business returns start at $1,500 and MFJ personal returns start at $1,000. For a complete breakdown, visit our pricing page.

Proven Track Record

We have completed cost segregation studies across residential rentals, short-term rentals, multi-family buildings, commercial properties, and mixed-use developments. Our clients consistently report that the tax savings from their cost segregation studies exceed the cost of their entire annual engagement with our firm. See real results on our case studies page.

Frequently Asked Questions About Cost Segregation Studies

What is a cost segregation study?

A cost segregation study is an IRS-approved engineering-based analysis that reclassifies components of a building from long-life property (27.5 or 39 years) into shorter recovery periods (5, 7, or 15 years) under IRC Section 168. This accelerates depreciation deductions and reduces your current tax liability. The study identifies every component of a building and assigns it to the correct MACRS asset class based on IRS guidelines, engineering standards, and legal precedent.

What is the minimum property value for a cost segregation study to make sense?

Cost segregation studies are generally cost-effective for properties valued at $300,000 or more. At this threshold, the accelerated depreciation savings typically exceed the cost of the study. Properties valued above $500,000 tend to produce even stronger returns on the study investment, often generating 5x to 10x the study cost in first-year tax savings.

Can I do a cost segregation study on a property I already own?

Yes. If you placed a property in service in a prior year, you can still benefit from a cost segregation study by filing Form 3115 (Application for Change in Accounting Method). This creates a catch-up deduction under IRC Section 481(a) that captures all the depreciation you missed in a single tax year, without needing to amend prior returns. This approach works for properties placed in service in any prior year, regardless of how long ago you acquired them.

What types of property qualify for cost segregation?

Virtually any income-producing real property qualifies, including residential rentals, short-term rentals (Airbnb/VRBO), apartment buildings, office buildings, retail spaces, industrial facilities, restaurants, hotels, mixed-use properties, and self-storage facilities. The property can be newly constructed, purchased, or renovated. Even properties acquired through 1031 exchanges are eligible, though special basis allocation rules apply.

How much can I save with a cost segregation study?

Savings vary by property type and value, but typically 20% to 40% of a building's purchase price can be reclassified into shorter-life asset categories. Combined with 100% bonus depreciation under OBBBA, this can generate first-year deductions worth tens or even hundreds of thousands of dollars in tax savings. For example, reclassifying $200,000 of components on a residential rental property at a 37% marginal tax rate produces $74,000 in first-year tax savings.

What is 100% bonus depreciation and how does it relate to cost segregation?

Under the One Big Beautiful Bill Act (OBBBA), 100% bonus depreciation has been made permanent under IRC Section 168(k). This means all property with a recovery period of 20 years or less that is reclassified through a cost segregation study can be fully deducted in the year the property is placed in service, rather than spreading deductions over 5, 7, or 15 years. This concentrates the entire tax benefit of cost segregation into a single year, maximizing the present value of the deduction.

Will a cost segregation study trigger an IRS audit?

No. Cost segregation studies are explicitly recognized and endorsed by the IRS. The IRS published its own Cost Segregation Audit Techniques Guide (ATG) to help agents evaluate these studies, which effectively validates the methodology. A properly conducted study actually provides audit protection because the engineering analysis and documentation support every reclassification with specific IRC citations, Treasury Regulations, and case law references.

What happens to depreciation recapture when I sell the property?

When you sell a property that benefited from cost segregation, the accelerated depreciation is subject to recapture. Personal property (5-year and 7-year assets) is recaptured as ordinary income under IRC Section 1245. Real property (15-year land improvements) is subject to a maximum 25% recapture rate under IRC Section 1250. However, tax planning strategies such as 1031 exchanges can defer recapture indefinitely, and the step-up in basis at death under IRC Section 1014 can eliminate it entirely.

How long does a cost segregation study take?

At AE Tax Advisors, we typically deliver a complete, audit-ready cost segregation study within 2 to 4 weeks. The timeline includes the engineering analysis, component classification, report generation, and integration with your tax return. Complex or large commercial properties may take slightly longer. Christina Nortman, our Operations Manager, coordinates every engagement to keep timelines on track.

Do short-term rentals qualify for cost segregation?

Absolutely. Short-term rentals (STRs) such as Airbnb and VRBO properties are excellent candidates for cost segregation. STRs with an average rental period of 7 days or less can even qualify for non-passive loss treatment under IRC Section 469, meaning the depreciation deductions can offset W-2 or active business income when the owner materially participates. This makes cost segregation on an STR one of the most powerful tax strategies available to real estate investors. Visit our short-term rental tax strategy page for a deep dive into STR tax planning.

What does a cost segregation study cost?

At AE Tax Advisors, cost segregation studies are priced at $1 per square foot with a $2,000 minimum. This covers the full engineering-based analysis, component classification, Form 3115 catch-up calculation for existing properties, and delivery of a complete audit-ready report. Our broader advisory engagement is $7,800 per year and includes comprehensive tax planning, strategy, and compliance. Business returns start at $1,500 and MFJ personal returns start at $1,000. The tax savings from a properly executed study typically exceed the cost many times over. For complete pricing details, visit our pricing page.

Can I use cost segregation with a 1031 exchange property?

Yes. Properties acquired through a 1031 exchange are eligible for cost segregation. However, the analysis must account for the carryover basis from the relinquished property and the new basis from any additional cash (boot) contributed. The excess basis above the exchanged amount is eligible for bonus depreciation, making cost segregation especially valuable for 1031 exchange properties where significant additional capital was invested.

Related Resources

Explore more of our tax planning resources for real estate investors and property owners:

• Real Estate Tax Planning: Comprehensive strategies for minimizing taxes across your entire real estate portfolio.
• Short-Term Rental Tax Strategy: Specialized planning for Airbnb, VRBO, and vacation rental properties.
• Rental Property Tax Planning: Maximize deductions and structure ownership for optimal tax efficiency on rental properties.
• CPA for Real Estate Investors: Why working with a CPA who specializes in real estate makes a difference.
• Cost Segregation Studies for Real Estate Investors (Detailed Guide): An in-depth look at cost segregation methodology and applications.
• AE Tax Advisors Blog: Stay current on tax law changes, planning strategies, and industry developments.
• Pricing: Transparent pricing for all of our advisory, compliance, and planning services.