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Cost Segregation
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Quick Summary
- Cost segregation services from Engineered Tax Services | ETS help commercial property owners and real estate investors accelerate tax deductions and increase near-term cash flow.
- What is cost segregation? Itās an IRS-recognized strategic tax planning tool that reclassifies building components from 39- or 27.5-year MACRS depreciation schedules into 5-, 7-, and 15-year recovery periods.
- 100 percent bonus depreciation has been permanently restored for qualifying property acquired and placed in service after January 19, 2025, under the One Big Beautiful Bill Act.
- Our engineering-based studies typically reclassify 20%ā45% of a buildingās cost basis, generating first-year tax savings of $50,000 to $1M+.
- Clients average $250,000+ in savings per property with a 10x average return on investment; most studies are completed in 4ā6 weeks.
- With 75,000+ completed studies, $2B+ in total tax savings, and 25+ years of experience across all 50 states, ETS is consistently ranked among the best cost segregation firms in the country.
- Use our free cost segregation calculator Ā to estimate your savings in minutes ā no commitment required.
Average Savings
250,000+
Per property on average
ROI
10x
Average return on investment
Time to Complete
4-6 weeks
For most properties
Cost Segregation Services at Engineered Tax Services
Maximize your propertyās tax benefits with expert cost segregation analysis services from the team CPAs and investors trust. Our engineering-based approach helps property owners unlock accelerated depreciation, defer federal income taxes, and put more cash back into their investments ā often within the very first year of ownership.
Cost segregation services help businesses, real estate investors, and property owners accelerate tax deductions and increase cash flow. Whether you own a single rental property Ā or a nationwide commercial portfolio, our cost segregation experts tailor every study to your property and your tax strategy.
Ready to see your potential savings? Use our cost segregation calculator to start a free analysis and consultation today.
What is Cost Segregation?
If youāre asking, āwhat is cost segregation,ā hereās the short answer: cost segregation is a strategic federal income tax tool that increases near-term cash flow by accelerating depreciation deductions and deferring income taxes.
Under the Modified Accelerated Cost Recovery System (MACRS), an entire commercial building is treated by default as a single long-term asset depreciated over 39 years (27.5 years for residential income-producing property). But a building isnāt just four walls and a roof. It contains hundreds of individual components ā electrical systems, plumbing, flooring, cabinetry, site improvements, and specialty equipment ā many of which the IRS allows to be depreciated over much shorter periods.
A cost segregation study analyzes the costs of a commercial or income-producing property and reclassifies qualifying components into 5-, 7-, and 15-year asset categories. The result: dramatically larger depreciation deductions in the early years of ownership, reduced current tax liability, and more capital available to reinvest in your business or your next property. Owned the property for a while? A look-back study Ā lets you capture every dollar of missed depreciation without amending prior returns.
How Components Are Classified: MACRS, Ā§1245 and Ā§1250
Every asset in your building falls into one of the MACRS classifications below. A quality study documents each component and assigns it to the correct category ā the difference between tangible personal property classifications (Ā§1245) and structural real property (Ā§1250) is where the tax savings live.
| MACRS Category | Recovery Period | Typical Components | Bonus Eligible? |
| Ā§1245 tangible personal property | 5 or 7 years | Carpet & specialty flooring, decorative lighting & millwork, dedicated electrical/plumbing serving equipment, appliances, FF&E, security & data systems | Yes |
| Land improvements | 15 years | Parking lots, sidewalks, curbing, landscaping, irrigation, site lighting, fencing, signage | Yes |
| Qualified Improvement Property (QIP) | 15 years | Interior, non-structural improvements to nonresidential buildings made after the building is placed in service | Yes |
| Ā§1250 building / structural | 27.5 or 39 years | Foundation, framing, roof, exterior walls, windows, base building systems | No (recovered over full life) |
Note that land improvements ā parking, landscaping, site utilities ā are among the most commonly overlooked reclassification opportunities, and Qualified Improvement Property (QIP) Ā gives owners of nonresidential buildings a powerful 15-year, bonus-eligible category for interior renovations such as retail buildouts, hotel room refreshes, and office improvements.
The study also documents your major building systems ā HVAC, plumbing, electrical, fire protection, security, and elevators ā as defined under the Tangible Property Regulations . That systems-level detail pays dividends for years: it supports repair-versus-capitalization decisions and future partial asset disposition deductions (see below).
Specialized Cost Segregation Studies by Property Type
Every property is unique, which is why ETS performs specialized cost segregation studies tailored to your specific property type rather than one-size-fits-all reports. Our customized approach ensures the maximum defensible tax benefit for your asset.
Commercial Properties
Maximize depreciation on office buildings , retail centers, warehouses, hotels, and medical facilities. As one of the top cost segregation providers for commercial buildings, ETS typically identifies 35% or more of a commercial propertyās components for accelerated treatment ā delivering an average ROI of 10:1 and the highest reclassification amounts allowable under IRS guidelines.
Residential Investment Properties
Optimize bonus depreciation and write-offs on apartment complexes , student housing, mixed-use developments, and short- or long-term rental properties . Residential studies commonly accelerate 20%ā40% of the propertyās basis, moving assets from a 27.5-year schedule into 5- and 15-year categories ā with 100% bonus depreciation available on qualifying components.
Property-Specific Cost Segregation Study Examples
- Self-Storage Facilities: minimal structural core and extensive site improvements mean 18%ā90% of basis can qualify for acceleration ā security systems, unit partitions, paving, fencing, and site lighting all typically reclassify.
- Car Washes and Gas stations: among the most favorable property types, with 50%ā100% acceleration potential; much of the facility qualifies as equipment or 15-year property.
- Restaurants: kitchen equipment, exhaust and ventilation, decorative finishes, and dedicated utilities commonly drive 25%ā45% reclassification.
- Hotels & Resorts: FF&E, guest room finishes, pool and site amenities, and QIP-eligible renovations typically produce 22%ā45% acceleration.
- Medical Offices: specialty plumbing, medical gas systems, dedicated electrical, and cabinetry commonly yield 20%ā40% reclassification.
Industry-Specific Cost Segregation Study Guides
Explore our library of industry-specific cost segregation guides, each with property-type benchmarks, commonly missed components, and real case studies:
Strategic Tax Planning Through Accelerated Depreciation
Cost segregation works best as part of a broader strategic tax planning framework. By identifying and reclassifying building components, property owners can front-load deductions, offset taxable income, and often achieve $50,000 to $1M+ in first-year tax savings.
- Accelerated depreciation: reduce recovery periods from 27.5 or 39 years down to 5, 7, or 15 years for qualifying components.
- Bonus depreciation: 100% first-year expensing is permanently available for qualifying property acquired and placed in service after January 19, 2025.
- Engineering-based analysis: detailed identification of every qualifying building component, documented to IRS standards.
- Cash flow benefits: improved liquidity that can fund renovations, acquisitions, debt reduction, or distributions.
Cost segregation also pairs naturally with related strategies: real estate professional status planning, 1031 exchanges, 179D energy-efficiency deductions , and 45L credits .
Depreciation Comparison: With vs. Without a Study
Illustration: a $2,000,000 office building (excluding land) acquired and placed in service in 2026.
| Metric | Straight-Line Only (39-Year) | With Cost Segregation + 100% Bonus |
| Basis reclassified to 5-year property | $0 | $400,000 (20%) |
| Basis reclassified to 15-year land improvements | $0 | $200,000 (10%) |
| First-year bonus depreciation | $0 | $600,000 |
| First-year total depreciation deduction | ā $51,000 | ā $636,000 |
| Additional first-year deductions | ā | ā $585,000 |
| Estimated first-year cash benefit (37% rate) | ā | ā $216,000 |
100% Bonus Depreciation is Back ā Permanently
The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025. That means you can once again deduct 100% of the cost of qualifying assets ā in full, in the first year ā with no scheduled phase-down. Read our tax alert on the IRSās bonus depreciation rules for the fine print.
Bonus depreciation applies to MACRS property with a recovery period of 20 years or less, including:
- Non-structural interior improvements and Qualified Improvement Property (QIP)
- Furniture, fixtures, and equipment (FF&E)
- Land improvements such as parking lots, landscaping, and site lighting
Why it matters: a cost segregation study is the key that unlocks bonus depreciation for building owners. The study identifies and documents which components qualify for short recovery periods ā and every dollar reclassified into 5-, 7-, or 15-year property can now be fully deducted in year one. Combined with permanent 100% bonus depreciation, accelerating depreciation deductions through cost segregation has never been more valuable.
Our Engineering-Based Cost Segregation Methodology
Engineered Tax Services | ETS is one of the most experienced engineering-based cost segregation studies providers in the United States. Our rigorous, data-driven methodology follows the IRS Cost Segregation Audit Techniques Guide Ā at every step:
1. Engineering analysis (1ā2 weeks).
Our specialists conduct a thorough analysis of your propertyās components, systems, and construction documents, including site inspection, component identification, and detailed measurements.
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2. Cost allocation (2ā3 weeks)
Costs are allocated to specific building components using engineering take-offs, construction cost data, market-based valuations, and value engineering review ā with every allocation reconciling to your purchase price or project costs.
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3. Tax classification (1ā2 weeks).
Components are classified into the appropriate MACRS recovery periods under IRS guidelines, with optimized depreciation schedules and compliance verification.
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4. Documentation and review (1 week).
Comprehensive, audit-ready reports are prepared and reviewed by tax experts, including full photo documentation, an organized asset listing that ties to your fixed asset ledger, and supporting workpapers.
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5. Results and strategic planning (1ā2 weeks).
We walk you and your CPA through the findings, tax savings projections, and implementation roadmap so the study integrates seamlessly with your broader tax strategy.
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The Engineering Approach vs. the Residual Approach
Not every study is built the same way. The IRS Cost Segregation Audit Techniques Guide describes several methodologies, and the difference matters when your deductions are examined:
- Engineering approach (detailed engineering / actual cost method): components are individually identified, measured, and costed from construction documents, site inspection, and engineering take-offs. It produces the most accurate, defensible result ā and typically the largest supportable reclassification. This is the ETS standard, averaging 30ā45 documented asset components per study.
- Residual (or abbreviated) approach: short-life assets are estimated and everything unexamined is lumped into the building. Itās faster and cheaper, but it routinely leaves deductions unidentified and offers thinner support under audit.
When comparing cost segregation study providers, ask which methodology they use, whether a site visit is included, and how many components they document. The answers separate the best cost segregation firms from the rest.
Beyond the Study: Tangible Property Regulations & Partial Asset Disposition
A detailed engineering-based study keeps paying off long after year one:
Tangible Property Regulations (TPR)
the component-level and building-systems detail in your study supports repair-versus-capitalization decisions under the final ārepair regulations,ā helping you expense qualifying repairs rather than capitalizing them.
Partial Asset Disposition (PAD)
when you replace a roof, HVAC unit, or other building component, the studyās cost detail lets you write off the remaining basis of the retired component in the year of replacement ā a deduction that is lost forever if not claimed in that year.
Future Renovations
a documented baseline of original components makes later QIP, disposition, and improvement studies faster and more valuable.
Why ETS is Among the Best Cost Segregation Firms
Not all cost segregation study providers are created equal. Some rely on abbreviated residual estimates or software-only models that leave deductions on the table and offer little support if the IRS asks questions. ETS delivers fully documented, IRS cost segregation solutions built on 25+ years of specialty tax experience.
- Engineering-based methodology: detailed component-level analysis (typically 30ā45 asset components per study), not rough square-footage estimates.
- IRS-aligned documentation: every study follows the IRS Cost Segregation Audit Techniques Guide and includes full audit defense support at no additional charge. See our 5 tips for avoiding an audit .
- Proven scale and results: 75,000+ studies completed, $2B+ in client tax savings, and a 98% client satisfaction rating.
- Nationwide coverage: cost segregation specialists strategically located across all 50 states.
- CPA collaboration: we work directly with your CPA or tax preparer, delivering schedules and Form 3115 support that drop cleanly into your return.
When investors and CPA firms compare the best cost segregation firms, they consistently choose Engineered Tax Services | ETS for the combination of engineering rigor, defensible documentation, and white-glove service.
Beyond Cost Segregation: Your Complete Tax Strategy Partner
Cost segregation is just the beginning. As your strategic tax partner, ETS delivers a comprehensive suite of services designed to maximize your real estate investment returns ā from R&D tax credits Ā and 179D energy-efficiency deductions Ā to 45L credits , 1031 exchange services, and tailored commercial insurance protection . One team, one integrated strategy, every incentive youāre entitled to.
Frequently Asked Questions
What is cost segregation?
Cost segregation is an IRS-recognized tax strategy that separates the components of a commercial or income-producing property into shorter MACRS depreciation categories. Instead of depreciating the entire building over 39 years (or 27.5 years for residential rentals), qualifying components ā such as flooring, specialty electrical, cabinetry, and land improvements ā are depreciated over 5, 7, or 15 years. The result is larger deductions sooner, lower current taxes, and stronger cash flow.
What is included in a cost segregation study?
A cost segregation study surveys your buildingās subcomponents ā lighting fixtures, HVAC systems, plumbing, finishes, site improvements, and more ā and assigns each to its proper 5-, 7-, or 15-year recovery period. Your final deliverable includes an engineering analysis report, component-level cost detail, updated depreciation schedules, and audit-ready documentation your CPA can apply directly to your tax return.
How much does a cost segregation study cost?
Most professionally prepared studies range from $3,000 to $12,000 depending on property size and complexity. Given that first-year savings frequently reach six or seven figures, the return on investment averages 10:1 or better. Our free cost segregation calculator can estimate your savings before you spend a dollar.
Are cost segregation studies worth it?
For most owners of commercial or income-producing property, absolutely. With the One Big Beautiful Bill Act permanently restoring 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, components reclassified into 5- or 15-year categories can be deducted in full in year one. On a property that would otherwise depreciate over 27.5 or 39 years, that can mean hundreds of thousands of dollars in immediate tax savings.
What types of properties qualify for cost segregation?
Most commercial and investment properties qualify, including office buildings, retail spaces, industrial facilities, apartments, hotels, medical facilities, self-storage, and warehouses. Properties must have been built, purchased, or substantially renovated after 1986, and studies generally make economic sense for properties with a depreciable basis of roughly $500,000 or more ā though smaller properties can still benefit.
When is the best time to do a cost segregation study?
The ideal time is the year you purchase, build, or renovate the property ā and always before a construction rehab, so the study can establish a clean baseline of the original components before improvements are made. That said, a study can deliver value at almost any point in your ownership through a look-back analysis.
How long does a cost segregation study take?
The typical timeline is 4ā6 weeks from start to finish, including the property inspection, engineering analysis, and final report preparation. Larger or more complex properties may require additional time.
Can I do a cost segregation study on a property Iāve owned for years?
Yes. Through a ālook-backā study, you can claim all the depreciation you missed in prior years ā without amending past returns ā by filing IRS Form 3115 (Change in Accounting Method). The catch-up Ā§481(a) deduction is taken in the current tax year, which can produce a substantial one-time reduction in taxable income.
What documentation is needed for a cost segregation study?
Typically we request property purchase documents, construction drawings if available, existing depreciation schedules, and renovation records. Donāt worry if your records are incomplete ā our engineering-based approach, including on-site inspection, can deliver fully supportable results even with limited documentation.
How does bonus depreciation affect cost segregation benefits?
Bonus depreciation allows immediate expensing of qualifying short-life property ā exactly the assets a cost segregation study identifies. The applicable rate depends on when the property was acquired and placed in service: 100% for 2017ā2022, 80% for 2023, 60% for 2024, and ā under the One Big Beautiful Bill Act ā a permanent 100% for qualifying property acquired and placed in service after January 19, 2025. Bonus depreciation can also be applied retroactively to eligible assets identified in a look-back study.
What is Qualified Improvement Property (QIP)?
QIP is any interior, non-structural improvement made to a nonresidential building after the building is placed in service ā think retail buildouts, office renovations, and hotel room refreshes. QIP carries a 15-year recovery period and is fully eligible for 100% bonus depreciation, which means qualifying renovation costs can often be written off immediately. It excludes building enlargements, elevators and escalators, and structural framework.
Whatās the difference between an engineering-based study and a residual study?
An engineering-based study individually identifies, measures, and costs each component using construction documents, site inspection, and engineering take-offs ā the approach the IRS Cost Segregation Audit Techniques Guide recognizes as the most accurate and reliable. A residual study estimates short-life assets and lumps the rest into the building, which is faster but typically identifies fewer deductions and provides weaker audit support. ETS performs engineering-based studies exclusively.
What are the Tangible Property Regulations and partial asset disposition?
The Tangible Property Regulations govern when building expenditures may be expensed as repairs versus capitalized, using your buildingās major systems (HVAC, plumbing, electrical, fire protection, and more) as the unit of analysis. Partial asset disposition lets you deduct the remaining basis of a component you replace ā such as an old roof ā in the year of replacement. Both benefits depend on component-level cost detail, which is exactly what an engineering-based cost segregation study provides.
Will a cost segregation study trigger an IRS audit?
No ā a properly conducted study should not trigger an audit. Cost segregation is a well-established, IRS-recognized practice, and the IRS publishes its own Cost Segregation Audit Techniques Guide describing what a quality study looks like. ETS studies are built to that standard, with thorough engineering documentation supporting every classification, and we provide full audit defense if your return is ever examined.
How do I choose among cost segregation study providers?
Look for three things: methodology, documentation, and support. The best cost segregation firms use a detailed engineering-based approach (not software-only estimates), produce component-level reports aligned with the IRS Cost Segregation Audit Techniques Guide, and stand behind their work with audit defense. Ask any provider how many components they typically document, whether a site visit is included, and who supports you if the IRS asks questions.
How can I estimate my savings before committing to a study?
Start with our free cost segregation calculator. Enter a few basic details about your property ā type, purchase price, and placed-in-service date ā and youāll receive an estimate of your potential accelerated deductions and first-year tax savings, followed by a no-obligation consultation with one of our specialists.