Cost Segregation Reclassification Percentages: 2026 Benchmarks

Key Findings

• The share of depreciable basis reclassified to shorter MACRS recovery periods (5, 7, or 15 years) depends on property type: typically 9–32% for a single-family rental, 19–39% for a furnished short-term rental, and 18–34% for commercial property
• As a share of the total purchase price the figure is lower, because land is not depreciable
• STRs and high-amenity properties consistently produce the highest reclassification rates
• Based on engineering-based studies using industry-standard construction cost data and IRS-recognized classification methods under Rev. Proc. 87-56

Cost segregation marketing is full of vague promises. “Save tens of thousands.” “Accelerate 40%+ of your depreciation.” These numbers are rarely sourced, rarely contextualized, and almost never broken out by property type.

This page is different. Below are the reclassification bands we publish for each property type: the range most of our delivered studies fall inside, and for property types with few delivered studies, a modeled range. They are not cherry-picked outliers. They reflect what a typical property in each category produces when analyzed at the component level using industry-standard construction cost data and classified per the IRS Cost Segregation Audit Techniques Guide.

Two metrics matter here. % of depreciable basis reclassified tells you what portion of the building (after subtracting land) gets moved from the default 27.5-year or 39-year schedule into 5, 7, or 15-year recovery periods. % of purchase price tells you the effective acceleration as a share of what you actually paid—a more intuitive number for calculating real tax savings. The gap between them is land allocation.

Residential Benchmarks

Residential properties default to a 27.5-year recovery period under MACRS. Cost segregation reclassifies qualifying components into 5-year personal property (cabinetry, appliances, carpet, fixtures), 7-year property (certain equipment), and 15-year land improvements (driveways, landscaping, fencing, pools). With 100% bonus depreciation restored permanently under the One Big Beautiful Bill Act, all reclassified components can be deducted in full in Year 1.

Property Type	% of Basis Reclassified	% of Purchase Price	Key Drivers
Single Family Rental	9–32%	7–26%	Interior finishes, landscaping, property age
STR / Airbnb	19–39%	15–31%	FF&E, furnishings, outdoor amenities
Duplex / Triplex / Fourplex	8–21% / 8–26% / 14–29%	6–17% / 6–21% / 11–23%	Per-unit finishes, shared building systems
Condo	10–17%	9–15%	Limited scope (no roof, foundation, exterior)
Townhome	13–19%	10–15%	Owns its building and lot, so it reclassifies more like a single-family home
Multifamily (5+ units)	14–26%	11–21%	Scale effects, shared systems, site work

The SFR and small multifamily bands overlap heavily, and their typical values sit close together, around 16% to 18% of basis. This isn’t a coincidence. These properties share a similar building envelope—wood-frame construction, standard MEP systems, typical landscaping—and the components that qualify for acceleration are largely the same: flooring, cabinetry, appliances, light fixtures, and site improvements.

STRs stand out because they contain a category of property that unfurnished rentals don’t: furniture, fixtures, and equipment. A fully furnished Airbnb has beds, dressers, sofas, dining tables, TVs, linens, kitchenware, and often outdoor amenities like hot tubs, fire pits, and game room equipment. All of this is 5-year or 7-year property under IRC §168. That’s why a typical furnished STR reclassifies about 10 percentage points more of its basis than a typical unfurnished SFR.

Condos are at the bottom because of scope, not study quality. A condo owner doesn’t own the roof, foundation, exterior walls, parking structure, or common-area landscaping. The depreciable scope is essentially the interior: finishes, fixtures, appliances, and the unit’s share of building systems. Less building to segregate means a lower percentage. For more on what percentages to expect and why, see our detailed breakdown.

Commercial Benchmarks

Commercial properties default to a 39-year recovery period—nearly 12 years longer than residential. That longer default timeline means cost segregation has proportionally more impact: each reclassified dollar is moving a greater distance on the depreciation schedule.

Commercial benchmarks vary more widely than residential because the building systems themselves vary more. An office building and a restaurant are fundamentally different structures with different cost profiles. Office 16–29% of basis

Tenant improvements, specialty electrical and data/telecom infrastructure, raised flooring, and MEP systems serving individual tenant spaces. Higher-end Class A offices with significant buildout skew toward the top of the range. Medical Office 16–29% of basis

Specialty plumbing (medical gas lines, vacuum systems), clean room finishes, lead-lined walls for imaging suites, exam room cabinetry, and dedicated HVAC zoning. Medical offices can reclassify more than a general office when the specialized fit-out is owned and documented, because it creates more short-life personal property. Retail 20–37% of basis

Storefront systems, display lighting, specialty flooring, tenant partition walls, and signage infrastructure. Retail spaces with extensive tenant buildout (restaurants in retail shells, high-end showrooms) push toward the upper boundary. Restaurant 16–29% of basis

Commercial kitchen equipment, walk-in coolers and freezers, grease traps, exhaust hood systems, bar buildout, specialty plumbing, and dedicated electrical circuits. How far up the band a restaurant lands depends on how much of that equipment and specialized finish the owner holds and documents, rather than the structural shell. Industrial / Warehouse 15–28% of basis

Dock equipment and levelers, heavy electrical distribution, crane systems, specialized flooring (sealed concrete, epoxy), and significant site work (truck courts, loading areas, perimeter fencing). Industrial properties derive a larger share of their reclassification from 15-year site improvements than other commercial types.

What Drives Variation Within These Ranges

The ranges above are wide for a reason. A 17% SFR and an 18% SFR are both normal outcomes, and the difference comes down to specific property characteristics, not study quality. Understanding what drives variation helps set realistic expectations before ordering a study.

Age and condition matter more than most investors realize. Older properties tend to produce higher reclassification rates because they have more component differentiation. A 1985 home has had carpeting replaced, fixtures updated, landscaping mature, and systems upgraded over four decades. Each of those interventions creates identifiable short-life property. A 2023 new-build has original everything—less differentiation, fewer separately identifiable components, and typically a lower reclassification rate. This isn’t a flaw in the methodology. The IRS classification rules are based on component useful life, and newer components simply have longer remaining useful lives.

how we classify building components →

Furnishing level is the single biggest variable for residential properties. The gap between a typical unfurnished SFR (around 16%) and a typical furnished STR (around 26%) is mostly explained by FF&E. Furniture, appliances, linens, entertainment systems, outdoor furniture, and hot tubs are all 5-year or 7-year property. A mountain cabin with four furnished bedrooms, a game room, and an outdoor entertainment area can have $50,000–$100,000 in personal property that an unfurnished rental simply doesn’t have. Material participation rules under IRS Publication 925 may allow STR owners to use these accelerated deductions to offset W-2 income—a significant advantage discussed in detail on our STR cost segregation page.

Site improvements are often the forgotten category. Landscaping, fencing, driveways, patios, retaining walls, swimming pools, and exterior lighting all qualify as 15-year land improvements under IRC §168(e). For properties with extensive outdoor features—a Smoky Mountain cabin with a wraparound deck and fire pit, a Florida rental with a pool and paver patio—15-year property can account for 8–12% of the depreciable basis on its own. Some properties have more value in their 15-year bucket than their 5-year bucket, though this rarely makes the marketing brochure.

Construction quality affects 5-year and 7-year allocation directly. Custom cabinetry, specialty tile, built-in shelving, designer light fixtures, and high-end appliances all cost more per unit than builder-grade equivalents, and they’re all short-life property. A $1.2M custom home with a chef’s kitchen and imported tile has more accelerated depreciation in absolute dollars than a $500K tract home—not just because the basis is larger, but because a higher proportion of the construction cost is in short-life components. For more context, see when cost segregation does and doesn’t make sense.

Geography doesn’t change the percentage but changes the dollar amounts. Construction cost indices (based on BLS Producer Price Index data) adjust component costs by metro area. Building in San Francisco costs more per square foot than building in Memphis. The same 18% reclassification rate produces a larger absolute deduction on a higher-cost-basis property.

What These Numbers Mean for Tax Savings

Benchmarks are useful, but investors care about dollars. Here’s a worked example using a $750,000 short-term rental—a common property profile in markets like the Smoky Mountains, Gulf Coast, or Arizona.

cost segregation for short-term rentals → $750K Furnished Airbnb — 34% Reclassification Rate (illustrative, upper part of the STR band) Purchase price $750,000 Land allocation (20%) $150,000 Depreciable basis $600,000 Reclassified to 5/7/15-year (34%) $204,000 Year 1 bonus depreciation (100%) $204,000 Est. federal tax savings (37% bracket) $75,480 Study cost $995 Net benefit $74,485

That’s a 94:1 return on the study cost. At the typical 26% of basis, the Year 1 deduction would be about $156,000, producing roughly $57,720 in federal tax savings. The economics of cost segregation don’t depend on hitting the top of the benchmark range. They work across the entire band.

For a detailed component-level walkthrough of a similar property, see our $750K Airbnb example report or the $500K STR example.

To see your own property’s estimated breakdown, run it through the calculator. It takes 60 seconds, requires no signup, and produces a property-specific estimate based on the same Industry-standard construction cost data used in our full studies.

Methodology

These benchmarks are derived from engineering-based cost segregation studies using industry-standard construction cost data, county assessor records, and satellite imagery. Each study follows the methodology outlined in the IRS Cost Segregation Audit Techniques Guide and classifies components according to Rev. Proc. 87-56 asset class guidelines. Construction costs are adjusted for geography using BLS Producer Price Index data, and land allocation uses a multi-source pipeline (county assessor data, statistical metro-level models, and property-specific adjustments).

Reclassification percentages reflect the portion of depreciable basis (purchase price minus land) moved from the default recovery period (27.5 years for residential, 39 years for commercial) into 5-year, 7-year, or 15-year MACRS classes. For a deeper explanation of how our cost segregation studies work, including what you receive and how the analysis is structured, see our overview page.

Few cost segregation firms publish their reclassification benchmarks in this kind of detail. For a look at how 27 firms publish reclassification benchmarks (and how many don’t), see the cross-provider methodology comparison at costsegregationreviews.com.

Frequently Asked Questions What percentage of a building can be reclassified in a cost seg study?

It depends on the property type. Single-family rentals typically reclassify 9–32% of depreciable basis (most often around 16%), furnished short-term rentals 19–39% (around 26%), and commercial properties 18–34% (around 22%), moving it from the default 27.5-year (residential) or 39-year (commercial) schedule into shorter recovery periods. Where a property lands depends on its age, furnishing level, site improvements, and what is documented. Why do STRs have higher cost seg percentages?

Short-term rentals contain significantly more personal property than unfurnished rentals. Furniture, appliances, linens, kitchenware, entertainment equipment, hot tubs, and outdoor amenities all classify as 5-year or 7-year property under MACRS. A fully furnished STR most often has around 26% of its depreciable basis in accelerated categories (typically 19–39%), compared to around 16% for an unfurnished single family rental. The building shell is the same; the difference is the contents. Are these percentages guaranteed?

No. These are benchmark ranges based on typical properties, not guarantees for any specific property. Every property is different. A 1960s SFR with a large lot, mature landscaping, and renovated finishes will produce a different result than a 2024 new-build condo with a small patio. A cost segregation study analyzes each property individually at the component level. The benchmarks tell you what’s typical for your property type; the study tells you what’s specific to your property. How do I know if my property will be at the high or low end?

Properties skew toward the high end when they are older (pre-2000), fully furnished, have significant site improvements (pools, extensive landscaping, long driveways, fencing), or feature custom finishes rather than builder-grade materials. Properties skew toward the low end when they are newer construction, unfurnished, have minimal outdoor improvements, or are condos with limited depreciable scope. The calculator can give you a property-specific estimate in 60 seconds — or order your study → directly if you’ve already mapped the math.

Related Reading

• What Makes a Cost Segregation Study Audit-Defensible?
• Cost Segregation vs. Standard Depreciation: The $50,000 Difference
• The STR Tax Loophole Explained: How Short-Term Rental Owners Offset W-2 Income
• Every Component in a Cost Segregation Study: The Complete MACRS Reference

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Frequently asked

What percentage of a building can be reclassified in a cost seg study?

It depends on the property type. Single-family rentals typically reclassify 9–32% of depreciable basis (most often around 16%), furnished short-term rentals 19–39% (around 26%), and commercial properties 18–34% (around 22%), moving it from the default 27.5-year (residential) or 39-year (commercial) schedule into shorter recovery periods. Where a property lands depends on its age, furnishing level, site improvements, and what is documented.

Why do STRs have higher cost seg percentages?

Short-term rentals contain significantly more personal property than unfurnished rentals. Furniture, appliances, linens, kitchenware, entertainment equipment, hot tubs, and outdoor amenities all classify as 5-year or 7-year property under MACRS. A fully furnished STR most often has around 26% of its depreciable basis in accelerated categories (typically 19–39%), compared to around 16% for an unfurnished single family rental. The building shell is the same; the difference is the contents.

Are these percentages guaranteed?

No. These are benchmark ranges based on typical properties, not guarantees for any specific property. Every property is different. A 1960s SFR with a large lot, mature landscaping, and renovated finishes will produce a different result than a 2024 new-build condo with a small patio. A cost segregation study analyzes each property individually at the component level. The benchmarks tell you what's typical for your property type; the study tells you what's specific to your property.

How do I know if my property will be at the high or low end?

Properties skew toward the high end when they are older (pre-2000), fully furnished, have significant site improvements (pools, extensive landscaping, long driveways, fencing), or feature custom finishes rather than builder-grade materials. Properties skew toward the low end when they are newer construction, unfurnished, have minimal outdoor improvements, or are condos with limited depreciable scope.