R.E. Cost Seg vs. Cost Seg EZ

Any type of income-producing property placed into service after 1986 qualifies for cost segregation, making this tax strategy widely applicable across the real estate spectrum. We frequently work with both residential properties, including single-family rentals, multi-family buildings, and short-term rentals like Airbnb properties, as well as commercial projects ranging from office buildings and retail centers to industrial facilities and medical offices.

The key requirement is that the property must be used for business or investment purposes rather than as a personal residence. This includes properties you actively manage as rentals, those held for investment appreciation, and buildings used in your trade or business.

Properties acquired through various means including purchases, 1031 exchanges, inheritances, or new construction all qualify, as long as they meet the income-producing requirement and were placed in service after 1986.

You can perform a look-back cost segregation study on properties acquired as far back as 1987, when the current depreciation rules under MACRS went into effect. Through filing Form 3115 for an automatic accounting method change, you can claim all the accumulated missed depreciation as a Section 481(a) adjustment in the current tax year without amending any prior-year tax returns.

This means if you've been depreciating a property using straight-line depreciation for several years, you can still capture the benefits of accelerated depreciation you would have received had you performed cost segregation from the beginning. However, there are diminishing returns the longer you've owned and depreciated a property. Properties owned for more than 15 years may have limited remaining benefits, especially if they've already been substantially depreciated. The cost-benefit analysis becomes less favorable as the remaining depreciable life decreases, though high-value properties or those with significant improvements may still justify the study cost.

If you're planning to sell your property in the near future, the decision to pursue cost segregation requires careful consideration of depreciation recapture rules. When you sell a property after taking accelerated depreciation, you'll face recapture tax on the difference between accelerated and straight-line depreciation at ordinary income rates, which can be as high as 37%.

This recapture can significantly reduce or eliminate the benefits of cost segregation if the sale occurs too soon. We generally recommend holding a property for at least 3-5 years after performing cost segregation to ensure the time value of money and tax deferral benefits outweigh the eventual recapture tax. The exact break-even point depends on your tax rates, the amount of accelerated depreciation, and your cost of capital.

However, if you're planning a 1031 like-kind exchange rather than a taxable sale, cost segregation becomes much more attractive. In a 1031 exchange, you defer the recapture tax by rolling the basis into your replacement property, allowing you to continue benefiting from accelerated depreciation without immediate tax consequences. Even if you're selling within 2-3 years, cost segregation might still make sense if you're in a high tax bracket now but expect lower rates at sale, or if the property has minimal personal property that would be subject to higher recapture rates.

As a high W-2 earner, your ability to use rental property losses from cost segregation to offset wages depends on specific IRS rules regarding passive activities. Generally, rental activities are considered passive, and passive losses cannot offset active income like W-2 wages unless you qualify for specific exceptions.

The most comprehensive exception is achieving Real Estate Professional status, which requires spending more than 750 hours annually and more than half your total working time in real estate activities, plus materially participating in your rental properties. This is often difficult for high W-2 earners with full-time jobs to achieve. However, a more accessible option for many is the short-term rental exception (also known as the short-term rental loophole).

If your property has an average guest stay of 7 days or less, it's not considered a passive rental under IRS rules. By materially participating in the property's operation, which can be achieved through various tests including working 100-plus hours annually with no one else participating more, you can treat the income and losses as active, allowing offset against your W-2 income. The $25,000 active participation exception for long-term rentals phases out completely at $150,000 of modified adjusted gross income, making it unavailable to most high earners.

Even if you can't immediately use the losses against W-2 income, cost segregation still provides value by creating suspended passive losses that offset future passive income, reduce taxable rental income in profitable years, and become fully deductible when you sell the property. We strongly recommend consulting with a qualified tax advisor to determine your specific eligibility and develop the optimal strategy for your situation.

Real estate investors need to file IRS Form 3115, Application for Change in Accounting Method, when they're changing how they depreciate their property, most commonly after completing a cost segregation study on a property they've owned for more than one tax year. If you've already filed tax returns using straight-line depreciation and now want to implement accelerated depreciation based on a cost segregation study, Form 3115 formally notifies the IRS of this accounting method change. The form allows you to claim all previously unclaimed depreciation through a Section 481(a) adjustment in the current year, effectively catching up on years of missed accelerated depreciation without the need to amend prior returns.

This is particularly valuable because amending returns can trigger additional scrutiny, has statute of limitations restrictions, and requires significantly more paperwork. Form 3115 also helps correct past depreciation errors, such as using the wrong recovery period or failing to claim depreciation altogether. The automatic consent procedures for many common changes mean you don't need IRS pre-approval, making the process relatively straightforward. Filing this form ensures full compliance with IRS regulations while maximizing your legitimate tax deductions, protecting you from potential penalties or disputes during an audit.

Absolutely. Form 3115 is the essential bridge that allows you to implement cost segregation benefits when you've already been depreciating your property using standard straight-line methods. After completing a cost segregation study that identifies components eligible for shorter depreciation periods, Form 3115 enables you to formally change your depreciation method from straight-line to the accelerated method identified in the study. This change allows you to reclassify various building components into 5-, 7-, and 15-year property categories rather than the standard 27.5 or 39 years.

The most powerful aspect of Form 3115 is the Section 481(a) adjustment, which captures all the additional depreciation you would have claimed in prior years had you used cost segregation from the beginning. This means if you've owned a property for five years and just completed a cost segregation study, you can claim five years' worth of missed accelerated depreciation in the current tax year. This front-loading of deductions can create significant tax savings and improved cash flow, making Form 3115 an invaluable tool for maximizing the benefits of your cost segregation study.

The form essentially allows you to correct your depreciation method going forward while catching up on past benefits, all without the complexity of amending previous returns.

Partner payments are issued 30 days after the study has been delivered and paid for by the client.

No, our partner program is completely free to join and maintain.

Both partnership paths feature comprehensive dashboards and interfaces that allow you to track referrals, payments, studies, and more in real-time.

The documentation requirements for a cost segregation study are straightforward. Essential documents include your closing statement or HUD-1 settlement statement, any existing depreciation schedule, and a cost ledger for capital improvements in spreadsheet format.

While not required, several documents can be helpful if available, including property appraisals, floor plans or architectural drawings, photos of the property. You don't need to provide individual receipts, though you should keep them for backup purposes.

Depreciation amounts vary significantly based on property type and specific characteristics. Typically, a cost segregation study can reclassify 20-30% of a property's depreciable basis to shorter recovery periods. Residential properties usually see 15-25% acceleration, while commercial properties often achieve 20-35% acceleration.

Properties with significant improvements can see even higher percentages. Several factors affect these results, including land value allocation where lower allocations provide better results, the quality of finishes and fixtures throughout the property, the presence of specialized systems, the amount of site improvements like parking and landscaping, and any recent renovations or capital improvements that have been made.

While there's technically no limit to how far back you can perform a look-back study, practical considerations apply. You can capture depreciation from all open tax years, typically the most recent three years, and can even capture benefits from closed years through a Section 481(a) adjustment on Form 3115. However, documentation availability tends to decrease over time, making older studies more challenging.

The cost-benefit analysis becomes less favorable for older properties since depreciation already taken reduces the remaining benefit. The recommended approach is to focus on properties placed in service within the last 15 years, prioritizing higher-value properties first. You should evaluate the remaining depreciable life of the property and confirm that adequate documentation is available before proceeding with older properties.

While audit rates for properly prepared cost segregation studies are extremely low, certain factors may increase IRS scrutiny. Red flags include excessive reclassification percentages that seem unreasonable for the property type, inconsistent treatment across similar properties in your portfolio, poor or missing documentation, use of non-qualified preparers, and overly aggressive land valuations.

Best practices to avoid audit issues include always using qualified professionals with engineering expertise, maintaining detailed documentation of all assumptions and methodologies, following the IRS Cost Segregation Audit Technique Guide, being consistent in your approach across properties, and keeping thorough engineering justification for all reclassifications.

Whether you need real estate professional status depends on your income sources and how you plan to use your depreciation benefits. To qualify as a real estate professional, you must spend at least 750 hours annually in real estate activities and more than half of your total working time must be in real estate. You also need to materially participate in your rental activities. Achieving this status allows you to offset W-2 income with rental losses, which can be extremely valuable.

However, there's an important alternative for those who can't meet these requirements. If you operate short-term rentals and materially participate with at least 100 hours annually, you can offset active income without achieving real estate professional status. For those who don't qualify under either scenario, passive losses can only offset passive income, though unused losses carry forward indefinitely and can be used in future years.

The recommended holding period to maximize benefits from a cost segregation study is 3-5 years minimum, with 5 or more years being ideal to avoid significant recapture issues. While 2 years is the absolute minimum for smaller properties, shorter holding periods reduce the overall benefit. When you sell a property after accelerated depreciation, recapture rules apply.

Accelerated depreciation taken on personal property is recaptured at ordinary income tax rates, while standard straight-line depreciation is recaptured at a maximum 25% rate. This recapture can be deferred through a 1031 exchange if you're acquiring a replacement property. Despite the recapture considerations, the benefits of accelerated depreciation typically outweigh the recapture tax if the property is held for at least 3 years, due to the time value of money and the deferral benefit.

Distinguishing between repairs and capital improvements is crucial for tax treatment and cost segregation eligibility. Capital improvements that qualify for cost segregation include betterments that improve the property beyond its original condition, restorations that return property to working order after it has fallen into disrepair, and adaptations that ready the property for a new or different use.

Examples include new HVAC systems, roof replacements, additions to the building, and comprehensive kitchen or bathroom remodels. In contrast, repairs that are deductible in the current year include routine maintenance activities, fixing existing components without upgrading them, painting, patching, minor replacements, and work that simply keeps the property in ordinary operating condition.

Several safe harbor elections can simplify these determinations, including the de minimis safe harbor allowing immediate expensing of items under $2,500 or $5,000 with an applicable financial statement, the routine maintenance safe harbor for qualifying maintenance activities, and the small taxpayer safe harbor for buildings with an unadjusted basis under $1 million.

Yes, cost segregation applies to leasehold improvements with some special considerations. Leasehold improvements are depreciated over 39 years for nonresidential property, or over the lease term if it's shorter than the applicable recovery period. Qualified Improvement Property may qualify for bonus depreciation under current law, making it particularly attractive for cost segregation.

Tenant improvements can be studied regardless of who pays for them, and the fact that improvements will eventually revert to the landlord doesn't eliminate the current tax benefits for the tenant. For ground leases, improvements built on leased land qualify for cost segregation using the appropriate recovery periods regardless of the lease term. However, you should consider whether certain costs should be amortized over the lease term rather than depreciated.

State treatment of cost segregation and accelerated depreciation varies significantly across jurisdictions. Some states don't conform to federal depreciation rules and require separate depreciation schedules using different methods or recovery periods. Bonus depreciation rules particularly vary, with some states allowing full federal bonus depreciation, others allowing partial amounts, and some allowing none at all.

Many states have decoupling provisions that became effective at various points over the past decade. These differences require careful planning, including reviewing each state's specific rules where you have tax obligations, potentially needing state-specific considerations in your study, addressing multi-state allocation issues for properties or businesses operating in multiple states, and tracking the growing differences between federal and state tax basis. Professional guidance is often essential for multi-state property owners.

Healthcare properties have unique aspects that often make them excellent candidates for cost segregation. These properties typically contain specialized electrical and plumbing systems installed specifically for medical equipment, medical gas systems throughout the facility, lead-lined walls in X-ray rooms, dedicated HVAC systems for clean rooms or surgical suites, and extensive millwork and cabinetry for operatories and laboratories.

As a result, medical and dental offices often achieve 25-35% reclassification rates, with equipment-heavy practices seeing even better results. Don't forget to consider Section 179 expensing for qualifying medical equipment purchased separately from the building.

Self-storage facilities have characteristics that make them particularly favorable for cost segregation. These properties typically feature a high percentage of site improvements including driveways, parking, and outdoor lighting. Security systems, fencing, and gates represent significant short-life property investments. The buildings themselves often have minimal interior finishes, meaning a higher percentage of the cost relates to reclassifiable components.

Climate control systems, where present, add to the reclassification potential. It's common for self-storage facilities to achieve 30-40% reclassification rates, making them excellent candidates for cost segregation. When planning expansions, consider the timing of cost segregation studies to maximize benefits across different phases of development.

Section 179 and cost segregation serve different purposes and can actually be used together strategically. Section 179 allows immediate expensing up to $1,220,000 (for 2024) of qualifying property, including certain qualified real property improvements like HVAC systems, roofs, fire protection systems, and security systems placed in service after the building was first placed in service. However, Section 179 has income limitations requiring sufficient business income to use the deduction.

Cost segregation, on the other hand, identifies and reclassifies components throughout the entire property without dollar limits. The two strategies complement each other - you might use Section 179 for specific qualifying improvements while using cost segregation for the overall property analysis. Note that if you take Section 179 on certain components, those must be excluded from the cost segregation study to avoid double-dipping.

Since land itself cannot be depreciated, the allocation between land and building directly impacts the results of a cost segregation study. It’s important to note that we do not determine or participate in setting the land allocation — our analysis is based on the land value provided by the county/tax records or provided by the client.

If you believe the land and building allocation on your records is inaccurate, you can engage a qualified third party, such as a certified appraiser, to provide an independent valuation before the study is completed.

The classification depends on how the property is used rather than its physical characteristics. Residential rental property depreciates over 27.5 years and includes any building or structure where 80% or more of the gross rental income comes from dwelling units. A dwelling unit is a house or apartment used to provide living accommodations, but specifically excludes units in hotels, motels, or other establishments where more than half the units are used on a transient basis.

If your property operates like a hotel with average stays under 7 days and provides substantial services similar to hotels, it's classified as nonresidential property depreciating over 39 years. This distinction is crucial for short-term rental operators who might assume their single-family home would automatically qualify for 27.5-year depreciation when it may actually be classified as commercial property due to its transient use pattern.

For renovation projects, we ideally request the same types of documentation used for new construction, such as contractor invoices, AIA payment applications (Forms G702/G703), and detailed cost ledgers. That said, we understand that smaller residential renovations often don’t have this level of formal documentation.

In those cases, we provide a template spreadsheet designed specifically to help you organize renovation expenses. Estimated or ballpark figures are acceptable, although more detailed information can help maximize your depreciation benefits. You do not need to submit every individual receipt, but we recommend keeping them on file as supporting documentation in the event of an IRS inquiry.

If renovation costs have already been expensed or depreciated on prior tax returns, or if you plan to do so, those amounts should not be included again in the cost segregation study, as this would result in double-counting.

A full cost segregation report runs 30–100+ pages. It includes an asset-by-asset breakdown of every reclassified component, depreciation schedules by recovery period, the engineering methodology, and IRS compliance documentation. Your CPA uses this report to file your depreciation deductions.

Cost segregation study software varies by firm, but most use proprietary engineering platforms combined with industry-standard cost estimating tools like RSMeans data and Marshall & Swift. These systems help engineers assign accurate replacement costs to individual building components and map them to the correct IRS asset classes. The software matters less than the engineering methodology behind it; a credible firm follows the IRS Audit Technique Guide regardless of the tools used.

No. A standard depreciation analysis assigns the entire building (minus land) to one recovery period, 27.5 or 39 years. A cost segregation study goes further. It breaks the property into individual components and assigns each to the shortest defensible recovery period based on engineering analysis and IRS guidelines.

Yes, but you don't need to limit your search to local firms. Cost segregation is a specialized engineering discipline, and the best firms work with investors nationwide. R.E. Cost Seg serves clients in all 50 states. Property inspections can be conducted through virtual site visits, so geography is rarely a limiting factor. What matters most is the firm's engineering expertise, IRS compliance track record, and turnaround time, not proximity.

No, land isn’t depreciable. That’s why the calculator asks for land value: it helps estimate the depreciable basis attributable to the building and eligible components.

Generally, yes, capital improvements to an STR are typically depreciable. Include renovation costs that are capitalized (often contractor labor, materials, and related project costs). Routine repairs/maintenance are usually treated differently than capital improvements. Use the calculator to estimate impact, then validate treatment with your tax pro.

“Placed in service” is generally when the property is ready and available to rent (not necessarily when it was purchased). This date drives when depreciation begins and can materially change the Year 1 deduction amounts shown by the calculator.

Bonus depreciation generally applies to qualifying shorter-life property (often 5-, 7-, or 15-year components) rather than long-life structural building components. What qualifies depends on the facts, the asset’s classification, and the rules in effect for the tax year.

Usually, no. The main building structure is typically depreciated over 27.5 years (residential rental) or 39 years (commercial). Bonus depreciation is more commonly available for shorter-life components that may be identified through cost segregation.

Timing matters. The placed-in-service date determines the tax year the depreciation begins and can affect how much depreciation lands in Year 1 (including whether bonus depreciation is available/what percentage applies in that year).

Renovations can create new capitalized assets. If portions of the renovation are classified as eligible shorter-life property, those components may qualify for bonus depreciation (depending on the year and eligibility rules). Other renovation costs may remain long-life building components.

Yes. Commercial buildings are typically depreciated over 39 years, while residential rental property is typically 27.5 years. The calculator uses these baseline conventions before showing potential acceleration ranges.

Generally, yes, tenant improvements and buildouts are usually capital improvements that can be depreciated. Include qualifying capitalized costs (often labor + materials + related project costs) in the renovation/buildout input to estimate the incremental impact.

Potentially. Bonus depreciation generally applies to eligible shorter-life property (often 5-, 7-, or 15-year components) that may be identified through cost segregation. The main 39-year building structure is typically not bonus-eligible. Availability and percentages depend on the tax year and eligibility rules.

Yes, if the work is a capital improvement, include contractor labor, materials, and commonly capitalized soft costs (e.g., architecture/engineering, permits, project management) that are part of placing the improvement in service. Routine repairs and maintenance are typically excluded.

Improvements placed in service after acquisition are generally treated as separate capital additions with their own placed-in-service timing. The calculator’s “renovation cost” is meant to capture those capitalized additions so you can estimate the incremental depreciation impact (and any potential acceleration) attributable to the renovation.

Potentially. When a cost segregation approach identifies portions of the renovation that are eligible for shorter-life assets (often 5-, 7-, or 15-year property), those components may qualify for bonus depreciation if bonus is available for the tax year and the assets meet eligibility rules. Not all renovation costs qualify; some remain 27.5- or 39-year building components.

“Placed in service” is generally when the property is ready and available to rent. This date determines when depreciation starts and can significantly affect the calculator’s Year 1 results.

No, land isn’t depreciable. Only the building and eligible improvements/components are depreciated, which is why entering land value helps produce a more accurate estimate.

The basic concept is similar, but the depreciation schedule depends on factors like property classification, how it’s used, and placed-in-service timing. The calculator provides an estimate; final treatment can vary based on the specific facts.

Generally, yes for capital improvements. Include costs that are capitalized (often contractor labor, materials, and related project costs). Routine repairs and maintenance are usually treated differently. Use the renovation cost input to estimate the incremental impact.

No. This is a planning estimate. A CPA depreciation schedule and/or an engineered cost segregation study uses detailed asset classification and supporting documentation to determine final numbers.

Because the share of costs that can be reclassified into shorter-life property varies by building type, finishes, site work, and documentation. Conservative assumes a smaller reallocation; optimistic assumes a higher-end reallocation. Actual results depend on property-specific facts.

If the property is income-producing (rented or used in a business) and was purchased for $300,000+, there's a strong chance cost segregation can meaningfully accelerate depreciation for your client. We can confirm fit quickly with a few basic property details. Just send it our way, and we'll come back to you fast.

It's roughly a 50/50 split. The best fit depends on property type, complexity, available documentation, timeline, and your preferences as the filing advisor. We'll walk you through the tradeoffs once we have the property details.

Yes. We can CC you on communications at whatever level works for your workflow. Many partners prefer to be included early in the process, then step back once we're in the delivery phase. Just let your PSM know your preference, and we'll set it up accordingly.

Yes, proposals are always free. Once we have the property details, we typically turn them around within 24 hours, often same-day if information comes in early.

Your advisor pricing already includes a 15% discount built in, so you have full control over how you structure client pricing. Whether you pass savings through or bundle the study into your advisory engagement is entirely up to you.

No. Signing up for any R.E. Cost Seg partnership program is free. No setup fees, no minimums.

Every study includes two core deliverables:

1) Cost Segregation Report (PDF)

• Summary of findings
• Asset classifications and recovery periods
• CSI-format cost breakdown
• Legal framework, methodology, and disclaimers

2) Depreciation Schedule (Excel)

• Fixed asset listing with placed-in-service dates, methods, and bonus eligibility
• Year-by-year depreciation breakdown
• Formatted for direct import into tax software

Pricing is based primarily on the property's depreciable basis and complexity. Full fee tiers are outlined in our overview deck, and we can confirm exact pricing once we have the property details.

Yes, day care facilities can be great candidates for cost segregation, and we've completed many with strong outcomes. We can provide a free benefit analysis with a few basic property details.

Yes, here's a relevant resource: https://www.recostseg.com/post/cost-segregation-data-centers

Yes, gas stations are some of the strongest candidates we see for bonus depreciation. The IRS classifies service station buildings on a 15 year recovery period instead of the usual 39 years that applies to most commercial buildings, so the structure itself already qualifies for accelerated treatment, not just the land improvements around it.

Add in canopies, fuel dispensers, underground tanks, paving, and signage, which also fall into short recovery classes, and nearly the entire property ends up eligible instead of the usual 10 to 30 percent we typically pull out of a standard building. That makes gas stations one of the highest return property types for a cost segregation study

No. If you didn't do a cost segregation study in year one, you may still be able to complete a "look-back" study and catch up on missed depreciation using IRS Form 3115 (accounting method change), depending on your situation.

Potentially, yes. If the improvements include items that qualify as personal property and/or land improvements (and otherwise meet the requirements). Eligibility depends on the nature of the assets and the placed-in-service timing.

Generally, yes. The bonus depreciation percentage is tied to the year the property was acquired/placed in service. Filing a Form 3115 in a later year typically doesn't change that original bonus rate.

Yes! As long as the property is placed in service by December 31, you get the full bonus depreciation deduction for that year. Bonus depreciation isn't prorated by how many months you owned or used the property the way some other deductions are, so a property placed in service in December gets the same percentage as one placed in service back in January.

Here's a detailed explanation of audit/scrutiny considerations and best practices: https://www.recostseg.com/post/irs-audit-cost-segregation

In general, core structural components (e.g., foundations, structural framing, load-bearing walls, roofs, etc.) are typically not eligible to be reclassified into shorter-life personal property categories. Asset-specific classification can vary based on facts and engineering/tax analysis.

Depreciation recapture rules are complex and depend on the type of property, holding period, and transaction structure. Here's a detailed explainer: https://www.recostseg.com/post/depreciation-recapture-explained

Yes, here's the partners page with details: https://www.recostseg.com/partners

In cost segregation, components are typically reclassified from 27.5/39-year real property into shorter-life buckets: 5-year (personal property, e.g., certain removable finishes/equipment), 7-year (some personal property categories depending on use/class life), and 15-year (land improvements, e.g., parking lots, sidewalks, landscaping/irrigation, site lighting, fencing). The exact breakdown depends on the engineering analysis and asset details.

It depends on the facts, specifically how long guests typically stay. Many STRs are treated as residential rental property (27.5 years) when they meet the definition of a dwelling unit used for rental; however, if most stays are under 30 days, the property is treated as nonresidential (39 years) instead. The correct life requires reviewing your actual rental/booking history with your CPA.

Converting a rental or business property to personal use doesn't itself trigger bonus depreciation recapture. In the year you convert, you simply stop depreciating the property, and no gain, loss, or recapture is reported just for the conversion. Later, when you sell, the bonus (and other depreciation) you claimed earlier reduces your basis, so more of the sale price becomes taxable gain.

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For personal property components (like furniture and fixtures), that depreciation is generally recaptured as ordinary income under Section 1245. For the building and qualifying land improvements, bonus counts as accelerated depreciation, so the excess over straight line depreciation is recaptured as ordinary income under Section 1250, and any remaining gain is taxed as unrecaptured Section 1250 gain at up to 25%. The period the property was held for personal use in between doesn't prevent this recapture, it all happens at the time of sale if there's gain.

You take the federal position regardless of what the county has on file. Federal depreciation recapture follows the federal tax classification of the asset, not how the local assessor labels it for property tax purposes. If your cost segregation study identified components as 1245 property, those get recaptured as 1245 personal property on sale, and the building components stay 1250, no matter what the county's records say. The two systems serve different purposes and don't need to match.

Often, yes. If you own an interest in real property via a TIC structure, you generally still have a depreciable interest and may be able to benefit from cost segregation, subject to your share of basis, how the TIC is structured, and your tax situation. Details should be reviewed to confirm eligibility and allocations.

Our position is that the classification depends on actual rental day patterns, not on the type of property or platform used. The tax code only treats a unit as residential (27.5 year) if it qualifies as a dwelling unit, and a unit fails that test if it's used on a transient basis, meaning more than half the days it was rented out during the year went to stays under 30 days.

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Since a single Airbnb or VRBO unit is its own unit, that threshold is easy to cross: if your bookings are mostly short stays, the property lands on the 39 year nonresidential side regardless of how residential it looks. The inconsistent treatment you've seen out there usually comes from preparers defaulting to 27.5 because the property is a house, without actually checking the booking calendar. Our approach is to look at your actual rental days for the year and classify based on that, then confirm the final position with your CPA.

Sometimes. Many STRs are reported on Schedule E, but if substantial services are provided to guests (more hotel-like operations), reporting can shift (often discussed as Schedule C vs Schedule E). The correct treatment is facts-dependent and should be confirmed with the tax preparer.

Often, the preferred method to "catch up" missed depreciation (including from cost seg) is a look-back study with a Form 3115 accounting method change rather than amending prior returns. Whether an amendment is allowed/advisable depends on timing and facts, but many taxpayers use 3115 for missed depreciation.

Bonus depreciation under Qualified Production Property works a bit differently than what most people expect from cost segregation. QPP doesn't reclassify the building into a shorter recovery period the way QIP does, it stays 39 year nonresidential real property. Instead, Section 168(n) grants 100% bonus depreciation directly to that 39 year property itself, as long as it's used as an integral part of a qualifying production activity like manufacturing, production, or refining, placed in service after July 4, 2025 and before January 1, 2031.

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Cost segregation still matters here because most production facilities are mixed use, with office space, admin areas, and parking that don't qualify, so you need a reasonable allocation between eligible and ineligible square footage, and the IRS has specifically named cost seg data as acceptable support for that allocation. One thing to flag: there's a 10 year recapture window if the property changes use within that period, so this isn't a "take the deduction and forget it" provision the way some other bonus depreciation property is.

Truck repair facilities can be good candidates for cost segregation (often with meaningful 5-, 7-, and 15-year components). Placed-in-service timing matters for bonus depreciation, so confirming when the new building/assets were placed in service is key.

Yes, DST-sponsored real estate commonly uses cost segregation at the property level, with benefits allocated to investors based on offering structure and individual circumstances. The exact investor impact depends on allocations and the investor's tax profile.

In real estate, a cost segregation study is an engineering-based analysis that separates a building into its individual components — flooring, cabinetry, electrical, plumbing, parking, landscaping — and assigns each to the shortest IRS-allowed depreciation life (5, 7, or 15 years) instead of the default 27.5 or 39 years. Real estate investors use it to accelerate depreciation deductions and reduce taxable income in the early years of ownership.

Cost segregation studies are performed by specialized firms with engineering and tax expertise, not by typical CPAs. The IRS Audit Techniques Guide calls for engineering-based methodology, so a credible provider employs qualified engineers who inspect the property, classify assets, and produce audit-defensible documentation. Your CPA then uses the finished report to file the deductions. R.E. Cost Seg performs fully engineered studies for investors in all 50 states.

Tenant improvements are build-outs or upgrades made to a leased space (often to customize it for a specific tenant). Depending on what the improvements are, they may be treated differently for depreciation, some components may be eligible for shorter recovery periods and/or bonus depreciation. More detail: https://www.recostseg.com/post/retail-cost-seg-tenant-improvements

You'll speak with an R.E. Cost Seg specialist who works on cost segregation studies every day. We're not your tax preparer and we don't replace your CPA. We produce the engineering-based study your CPA uses to file. You're welcome to bring your CPA onto the call.

Yes. There's no cost and no obligation. If a study doesn't make financial sense for you, we'll say so.

The property address, purchase price, closing date, and any major improvements since purchase. That's enough for a solid estimate.

Cost segregation sits at the intersection of engineering and tax, so many generalist accountants don't raise it proactively. That's not a knock on your CPA, most are glad to have a specialist handle the study while they handle the return.

Often, yes. A look-back study can capture missed depreciation in the current tax year without amending prior returns.

R.E. Cost Seg supports our conclusions and is experienced in assisting clients in the event of an audit by the revenue service. R.E. Cost Seg will provide audit support which includes a written response to questions related to the engineering methodology, asset classifications, and conclusions of our study.

Audit support does not include representation before the IRS or any taxing authority, testimony as a fact or expert witness in any administrative or court hearing or proceeding, preparation or amendment of tax returns, or defense of tax positions not contained in our study, including positions independently adopted by Client or Client's tax advisor in connection with filing.

Our track record speaks to the quality of our work, with over 20,000 studies completed and less than 0.1% ever being audited. We maintain a 100% success rate in defending the audits that have occurred. Both Rapid and Engineered reports are equally defensible, and recordings of virtual inspections are available as evidence if ever needed.

R.E. Cost Seg options begin at $500 for the software tier and $950 for a Rapid Report. Fully engineered studies begin at $2,320 for residential property and $2,730 for commercial property. Across the wider industry, $3,000–$15,000+ is the broad benchmark for engineering-based studies. Residential and smaller commercial studies generally cost about $2,500–$7,500, while larger or more complex properties may cost $10,000–$25,000 or more.

Potentially. Bonus depreciation generally applies to eligible shorter-life property (often 5-, 7-, or 15-year components) that may be identified through cost segregation. The main building structure is typically not bonus-eligible. Availability and percentages depend on the tax year and eligibility rules.

Yes, for most building purchases. Bonus depreciation under IRC Section 168(k) applies to qualifying property with a recovery period of 20 years or less. Items already identified separately, such as furniture or equipment bought on their own, can qualify without a study, but most of a building's short-life value is built into its components. A cost seg study identifies and reclassifies those components into shorter recovery periods and gives your CPA the engineering-based documentation to support the accelerated deductions.

The One Big Beautiful Bill Act, signed into law on July 4, 2025, permanently reinstated 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025, fundamentally changing the landscape for real estate investors. Property acquired on or before January 19, 2025 remains under the prior phase-down schedule: 60% bonus depreciation if placed in service in 2024, or 40% if placed in service in 2025.

The new 100% rate cannot be applied retroactively to that property due to the effective date provisions in the legislation. However, for qualifying property acquired and placed in service after January 19, 2025, the reinstated permanent 100% bonus depreciation applies to all qualified property identified in your cost segregation study, including 5-, 7-, and 15-year property classifications. This permanence eliminates concerns about future phase-downs and makes long-term tax planning more predictable.

R.E. Cost Seg is committed to ensuring all our clients receive maximum value from this law change. All new studies for qualifying properties automatically apply the 100% rate. For studies we completed earlier in 2025 before the law was signed, we provide complimentary updates to the depreciation schedules if your property qualifies for the higher rate. Simply contact our team to request your free updated schedules.

This permanent reinstatement makes cost segregation studies even more valuable, as you can now accelerate the full cost of short-life property into the year placed in service without worrying about diminishing benefits in future years.

The virtual inspection is an essential part of the Fully Engineered Study, designed to be both thorough and convenient. It is conducted over a video call (via platforms such as Google Meet or Zoom) and typically lasts 30–60 minutes, depending on the property’s size.

During the session, a person with property access — such as a property manager, tenant, or contractor — uses a smartphone to guide our Site Visit Specialist through the property. The specialist provides step-by-step instructions to ensure all necessary areas and components are properly documented.

For those who prefer an in-person visit, we also offer an on-site inspection for an additional fee depending on location.

The timeline depends on the type of study you choose:

Rapid Report: Once you’ve made the payment and completed the online questionnaire, the process usually takes about 5 business days.

Fully Engineered Study: For a fully engineered analysis, the clock starts after you’ve submitted all the required documents and completed the virtual inspection. From there, the study typically takes about 15–20 business days (roughly 3–4 weeks) — including 10–15 days for the engineering work and 2–3 days to finalize and deliver your report.

If you need results sooner, we also offer a rush option with a 5-business-day turnaround, depending on availability during busier times of the year.

It depends on the study type.

Rapid Reports don't include an inspection. They're prepared from the property questionnaire and documents you submit.

Fully Engineered Studies include a 30–60 minute virtual inspection, scheduled based on your property's needs. It's conducted over a video call, with someone who has access to the property using a smartphone to guide our team through it. In-person site visits are available for an additional fee depending on location.

If you choose an in-person visit, a trained inspector captures detailed visual documentation, primarily through photographs, of the property’s condition, components, and improvements for our engineering team. The inspector will need full access to all readily accessible interior and exterior areas, excluding the roof and any areas that are not easily accessible. We recommend having someone from your team present to help facilitate access if needed. The length of the visit will vary depending on the size and complexity of the property.

While our studies are based on engineering analysis and IRS guidelines, we understand you may have questions about specific classifications. If you disagree with certain component classifications, we can review the engineering rationale and supporting documentation. Minor adjustments might be possible if you provide additional information about specific assets or their use. However, significant departures from engineering standards could compromise the study's defensibility.

You can choose to be more conservative than the study recommends by treating some personal property as structural components, though this reduces your tax benefits. We provide detailed documentation explaining each classification decision, which your CPA can review. Remember that our studies include audit support, so we stand behind our engineering conclusions. If you have specific concerns, it's best to address them before finalizing the study.

Yes, you can absolutely perform a cost segregation study in 2026 for a property placed in service in 2025. The cost segregation study is a valuable tool that provides your CPA with the necessary documentation to optimize property depreciation, and it's a one-time analysis that remains valid indefinitely. There's no requirement that the study be completed in the same calendar year as the property acquisition or placement in service. As long as the study is completed before you file your tax return for the year you want to claim the benefits, you can apply the accelerated depreciation.

The report will analyze the property as of its placed-in-service date in 2025 and provide depreciation schedules starting from that date. Your CPA will use this information when preparing your 2025 return, regardless of when in 2026 the study is actually completed, provided all deadlines are met.

Often, yes. A look-back cost segregation study can identify depreciation that should have been claimed in earlier years. The adjustment is generally reported through Form 3115 as a change in accounting method, allowing the cumulative catch-up adjustment under §481(a) without amending each prior return. R.E. Cost Seg offers a Form 3115 CPA Support Package to support this process; your tax professional should review, finalize and file the completed tax treatment with your return.

We pride ourselves on offering affordable cost segregation studies tailored to every budget and property type. Our self-directed Rapid Report, designed for smaller residential properties up to 4 units with a depreciable basis under $1,200,000 and capital improvements under $80,000, is available starting at $950.

For properties that don't meet these criteria and/or require more detailed analysis, our Fully Engineered Study starts at $2,320 for residential properties and $2,730+ for commercial properties. The final fee varies based on square footage, property type, and complexity of the analysis required. Rush service pricing for pending tax deadlines may apply and are subject to capacity availability.

Both services include audit support and are performed by qualified engineers following IRS guidelines. To understand exactly what a cost segregation study on your investment property would cost, we provide free proposals that include fee quotes along with estimated depreciation benefits, allowing you to evaluate the return on investment before committing to the study.

Compare our cost segregation study services.

There are two study options based on property characteristics. The Rapid Report (starting at $950) suits properties with depreciable basis under $1.2M, capital improvements under $80K, and residential properties under 3,500 sq ft—ideal for single-family homes, condos, and small multifamily. It uses a detailed questionnaire instead of inspection, with about a 5 business day turnaround.

The Fully Engineered Study (from $2,320) is required for properties exceeding these limits, all commercial properties regardless of size, and renovations over $80K. It includes virtual or on-site inspection with detailed component analysis and takes 15-20 business days. The key difference is methodology: Rapid Report uses software-based questionnaire analysis while Fully Engineered includes comprehensive site inspection, document review, and detailed engineering analysis. Both are IRS-compliant and include audit support.

The optimal time to perform a cost segregation study is within the tax year that the building is purchased, constructed, or substantially renovated. This timing allows you to maximize first-year depreciation benefits without needing to file additional forms with the IRS. When you conduct the study in the same year as acquisition or placement in service, you simply use the accelerated depreciation schedule from the start, avoiding the need for Form 3115 to change accounting methods.

However, this doesn't mean you've missed the opportunity if you've owned the property for several years. Look-back studies can capture missed depreciation from prior years through a Section 481(a) adjustment, bringing all that accumulated benefit into the current tax year. The key is completing the study before filing your tax return for the year you want to claim the benefits. For specific tax deadlines, we maintain strict cut-off dates to ensure quality delivery.

Failing to file Form 3115 when required can have several negative consequences for your tax situation and long-term financial strategy. If you implement a cost segregation study without properly notifying the IRS through Form 3115, you risk having the accelerated depreciation deductions disallowed during an audit, potentially resulting in back taxes, interest, and penalties. The IRS views unauthorized accounting method changes as non-compliance, which can trigger increased scrutiny of your returns.

Without filing Form 3115, you also miss the opportunity to claim the Section 481(a) adjustment that captures all prior years' missed depreciation in one year, essentially leaving significant tax benefits on the table. Additionally, if the IRS discovers the inconsistency between your depreciation methods across years, they may require you to file the form anyway, but under examination procedures rather than automatic consent, which is more complex and potentially costly.

You might also face accuracy-related penalties if the IRS determines you should have known about the filing requirement. Perhaps most importantly, without proper documentation through Form 3115, you lack the clear paper trail demonstrating IRS compliance, which could complicate future property sales, refinancing, or additional tax planning strategies.