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Cost Segregation

Cost Segregation Categories: What Qualifies and What Stays With the Building

A study sorts a building into 5, 7 and 15-year property, the building itself, and land.

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Here is where each common component usually lands, with both sides of every boundary.

Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated November 4, 2026. Taxstra is a CPA firm serving 1,000+ clients in all 50 states.

Quick answer

A cost segregation study sorts a building's cost into 5-year property (such as appliances and removable carpeting in a rental), 7-year property (such as office furniture), 15-year land improvements (such as parking areas and fences), the 27.5 or 39-year building, and land. The 5, 7 and 15-year parts can take bonus depreciation; the building and land cannot.

Every cost segregation study answers the same question for each part of a building: does it depreciate with the structure, or is it a separate, shorter-life asset? The answer sets how fast you deduct it and whether bonus depreciation can apply.

This guide is educational, not individualized tax advice. The examples are screening aids, not classifications for a specific property; the engineering allocation and your records control.

The Five Categories

Where a building's cost can land.

Recovery periodTypical examplesBonus depreciation
5-yearAppliances, removable carpeting and furniture in a rental; certain equipment-dedicated electrical and plumbingYes, if otherwise qualified
7-yearOffice furniture and fixtures; certain activity-specific equipmentYes, if otherwise qualified
15-yearLand improvements: sidewalks, parking areas, fences, landscaping, site lighting; qualified improvement propertyYes, if otherwise qualified
27.5-yearResidential rental building and its structural componentsNo
39-yearNonresidential building and its structural componentsNo
Not depreciableLandNo

For property acquired after January 19, 2025, qualified property with a recovery period of 20 years or less can take 100% bonus depreciation, so the 5, 7 and 15-year categories can be deducted in the first year. The building and land cannot. Acquisition date, placed-in-service date and elections still need review; see the bonus depreciation guide.

Removable is not the test
Function, attachment, the business activity and what a system serves decide the category. Central HVAC that heats the whole building stays with the building; a dedicated circuit that serves a piece of equipment may not.

Visual Component Atlas

26 common components, shown on both sides of the classification boundary.

See the classification boundary, component by component

Search 28 common building and site components. Each diagram shows the shorter-life fact pattern beside the condition that can keep the same-looking item with the building or land.

Screening guide only. Function, attachment, business activity, and engineering records control. The IRS audit guide supplies practical examination examples but says it is not legal authority.
Find a component
Recovery-period screen

Showing 28 of 28 components

Exploded floor-covering sectionA removable finish layer lifts away from an adhesive layer and structural floor slab.removable finishstrippable adhesivestructural floor
Interior finishes5-year

Readily removable floor coverings

Attachment and intended permanence separate the shorter-life candidate from the structural floor.

Shorter-life candidate
5-year

Section 1245

The covering can be readily removed without material damage or can be moved and reused, stored, or sold. The residential matrix treats VCT, sheet vinyl, and carpeting as nonpermanent.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 307IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

Tile, marble, wood, epoxy, or another finish is cemented, grouted, nailed, screwed, or otherwise intended to remain as a permanent floor covering.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 30626 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Do not classify every product sold as “vinyl plank” the same way. Installation method and removal damage still belong in the study file.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Removable blind in front of a permanent windowThe blind is shown as a removable layer while the glazed window remains in the wall opening.removable treatmentwindow + wall
Interior finishes5-year

Window treatments

A removable treatment can be personal property even though the window itself is structural.

Shorter-life candidate
5-year

Section 1245

Drapes, curtains, louvers, blinds, post-construction tinting, or decorative theme treatments are readily removable.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 321 to 322IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The cost is for the exterior window, glazing, frame, moisture barrier, or another permanent part of the wall opening.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 321 to 32226 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Separate the invoice for applied tint or shades from replacement glazing and window-frame work.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Freestanding furniture inside a roomA chair, table, and lamp sit independently from the surrounding walls and floor.freestandingbuilding shell
Equipment and furnishings5-year

Residential furniture and furnishings

Freestanding furnishings are normally tracked separately from the acquired or constructed building basis.

Shorter-life candidate
5-year

Section 1245

Beds, chairs, sofas, tables, and similar furnishings are acquired as movable personal property for the rental activity.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 308IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The item is built into the structure or is cabinetry, finish carpentry, or another component the applicable matrix treats as part of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 29826 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Furniture invoices generally do not need a cost-segregation allocation. Keep them out of building basis so the study does not double count them.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Freestanding desk and filing cabinetA desk and file cabinet are outlined separately from the wall behind them.office furniturewall
Equipment and furnishings7-year

Office furniture and fixtures

Asset Class 00.11 gives common office furniture a distinct 7-year recovery period under GDS.

Shorter-life candidate
7-year

Section 1245, Asset Class 00.11

The asset is a desk, chair, credenza, file cabinet, workstation, or reusable office system furniture rather than a structural component.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 307IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The cost is for fixed walls, permanent counters, doors, trim, or other construction integrated into the office or clubhouse.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 29826 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Activity-specific assets can have a different class life. Asset Class 00.11 is the clean office-furniture category, not a catch-all for every fixture.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Data cable linking communications equipmentA low-voltage cable path links a network panel to device endpoints independently from building power.network paneldata runsdevices
Building systems5-year

Data and communications cabling

Purpose and endpoint matter: equipment communications are analyzed separately from general building electrical service.

Shorter-life candidate
5-year

Section 1245, activity class dependent

Telephone, internet, cable, satellite, or Wi-Fi components serve communications equipment and are not structural components of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 300IRS Publication 5653 (2-2025), Cost Segregation Audit Techniques Guide

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The wiring is part of a building alarm, life-safety, energy-management, or other system serving the operation or maintenance of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 30426 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

“Low voltage” is not itself a recovery period. Trace what the cable serves and apply the activity class for that use.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Dedicated electrical branch serving one applianceOne highlighted circuit travels from a panel and breaker directly to a range while general outlets remain separate.paneldedicated circuitappliance
Building systems5-year

Appliance-dedicated branch circuits

The IRS residential matrix distinguishes a circuit dedicated to an appliance from outlets of general applicability.

Shorter-life candidate
5-year

Section 1245, Asset Class 57.0

The outlet, wire, conduit, and breaker are necessary to and used directly with a specific appliance, such as a dryer, range, washer, dishwasher, refrigerator, or built-in microwave.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 300IRS Pub. 5653, residential rental matrix, PDF p. 301

Compare the boundary and sources
Usually stays with the building
27.5-year

Section 1250 residential rental property

The branch circuit provides general lighting, HVAC, convenience outlets, GFI outlets, or other general building service.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 30126 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

This matrix entry is specific to residential rental property. Commercial equipment circuits require the applicable industry and functional analysis.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Electrical distribution split by end useA main panel branches toward equipment loads and toward general building loads, showing a functional allocation.distributionequipment loadbuilding load
Building systems5-year

Equipment-serving share of electrical distribution

Shared electrical cost is not classified by a blanket percentage; the IRS guide describes allocation by end-use design load.

Allocated shorter-life candidate
5-year or applicable equipment life

Section 1245 share

Engineering support allocates the primary and secondary distribution cost to qualifying equipment loads using design-load or another reasonable functional method.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 302IRS Pub. 5653, residential rental matrix, PDF pp. 302 to 304IRS Publication 5653 (2-2025), Cost Segregation Audit Techniques Guide

Compare the boundary and sources
Building-service share
27.5- or 39-year

Section 1250

The system capacity serves lighting, comfort HVAC, general outlets, and other operation or maintenance of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 302 to 30426 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

This is an engineering allocation, not a visual guess. Unsupported percentages are a specific review risk.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Accent light beside general room lightingA narrow accent beam highlights a display while separate ceiling fixtures provide general illumination.general illuminationaccent beam
Building systems5-year

Interior decorative or special lighting

The practical boundary is whether the room can still operate safely with the decorative fixture switched off.

Shorter-life candidate
5-year in the cited residential and distributive-trades contexts

Section 1245

The fixture is decorative or task-specific and other lighting supplies sufficient general illumination when it is off.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 302IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 314IRS Pub. 5653, retail matrix, PDF p. 177

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The fixture provides general, night, exit, or other lighting needed for the operation or maintenance of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 302IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 31426 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Decorative appearance alone is not enough. Document the illumination function and the business-activity asset class.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Facade accent light separated from safety lightingAn uplight highlights a wall while a building-mounted fixture illuminates the entrance path.accent onlyentrance safetysite light
Building systems5-year15-year

Exterior accent or special lighting

Accent-only, building-mounted, and freestanding site lights can land in three different treatments.

Accent-light candidate
5-year in the cited residential context

Section 1245

The light highlights only landscaping or the building exterior and does not illuminate parking, walkways, or entrances or otherwise serve building operation.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 301IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 314

Compare the boundary and sources
Freestanding site-light candidate
15-year

Asset Class 00.3 land improvement

The pole-mounted or freestanding system illuminates parking, sidewalks, or recreation areas.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 302IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 314

Usually stays with the building
27.5- or 39-year

Section 1250

The fixture is mounted on the building and provides safety, convenience, entrance, walkway, or parking illumination tied to building operation.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 301IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 31426 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Record where the fixture is mounted, what it illuminates, and whether another fixture supplies the required operational light.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Dedicated water and gas branches serving appliancesShort branch lines connect directly from building piping to a dishwasher, refrigerator, and range.building mainsdedicated branchesappliances
Building systems5-year

Appliance-dedicated plumbing or gas hookups

A short branch used directly with an appliance is analyzed differently from the building plumbing network.

Shorter-life candidate
5-year

Section 1245, Asset Class 57.0

A water or gas branch hooks directly to a dishwasher, refrigerator or icemaker, or stove or oven.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 311

Compare the boundary and sources
Usually stays with the building
27.5-year

Section 1250 residential rental property

The line, drain, fixture, disposal, sink, or other plumbing serves the kitchen, bathroom, occupants, or building generally.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 31126 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

This residential matrix distinction does not turn an entire kitchen plumbing system into personal property.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Suppression nozzles dedicated to cooking equipmentA compact suppression line and nozzles sit directly above a piece of cooking equipment, apart from building sprinklers.equipment suppressionbuilding sprinklercooking equipment
Building systems5-year

Equipment-specific fire suppression

The protected target, not the word “fire,” drives the first classification screen.

Shorter-life candidate
5-year in the cited context

Section 1245

The special detection or suppression system is directly associated with a specific piece of equipment, such as kitchen equipment.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 306IRS Pub. 5653, restaurant matrix, PDF p. 190

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

Sprinklers, alarms, exit lighting, fire doors, piping, pumps, and controls protect the building and occupants generally.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 305IRS Pub. 5653, residential rental matrix, PDF p. 30626 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

A code-required system can still require a functional analysis. Identify whether it protects the equipment, the building, or both.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Amplifier and speakers connected by signal wiringAn amplifier sends a signal to two speakers while a separate alarm circuit remains outside the system.amplifieraudio wiringalarm excluded
Equipment and furnishings5-year

Sound and audiovisual systems

A music or presentation system is a candidate only to the extent it is separate from building life-safety systems.

Shorter-life candidate
5-year in the cited context

Section 1245

Equipment, apparatus, and wiring provide amplified music or sound, such as in a pool or clubhouse area.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The speakers, wiring, or controls are part of a fire-protection, evacuation, alarm, or other building-operation system.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 32026 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Mixed paging, alarm, and entertainment systems should be traced and allocated rather than assigned one life as a bundle.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Demountable partition sliding away from fixed wallsA reusable panel is shown moving on a track while permanent framed walls remain fixed.movable panelfixed wall
Interior finishes5-year

Movable or reusable partitions

Removability must be real: the panel should remain usable after removal, not merely be non-load-bearing.

Shorter-life candidate
5-year in the cited residential context

Section 1245, Asset Class 57.0

The partition can be readily removed in substantially the same condition and is intended to be moved, reused, stored, or sold in its entirety.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 321 to 322

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

A framed or otherwise permanent partition divides rooms, provides traffic control, or would be damaged or discarded on removal.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 321 to 32226 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Non-load-bearing does not automatically mean personal property. Document the demountable system and reuse intent.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Decorative display casework beside structural trimA merchandise display and cashwrap are highlighted separately from doors, baseboard, and permanent room millwork.display caseworkstructural trimretail counter
Interior finishes5-year7-year

Decorative millwork and display casework

This is highly context-specific: a retail display can be shorter-life while residential kitchen cabinetry is not.

Retail or restaurant candidate
5-year

Section 1245, Asset Class 57.0

Decorative finish carpentry, cabinets, cashwraps, counters, or toppers enhance the selling or dining theme and do not operate or maintain the building.

Source: IRS Pub. 5653, retail matrix, PDF p. 177IRS Pub. 5653, restaurant matrix, PDF p. 190

Compare the boundary and sources
Certain recreation-area candidate
7-year

Section 1245, activity class dependent

Decorative millwork is used in an activity such as a theater, showroom, or casino for which the applicable activity class carries a 7-year GDS life.

Source: IRS Publication 5653 (2-2025), Cost Segregation Audit Techniques Guide

Usually stays with the building
27.5- or 39-year

Section 1250

The work is kitchen or restroom cabinetry, finish carpentry, doors, frames, trim, stairs, panel work, or other general building millwork. The residential matrix places kitchen and restroom cabinetry at 27.5 years.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 29826 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

A generic “cabinetry is five-year property” rule conflicts with the IRS residential rental matrix. Apply the actual industry and function.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Conveyor crossing a loading-dock openingA conveyor and compactor are highlighted while the dock wall, canopy, and overhead door form the building opening.conveyor + compactordock structure
Equipment and furnishings5-year

Loading-dock equipment

Material-handling equipment can be separated from the dock opening and structural receiving area.

Shorter-life candidate
5-year in the cited distributive-trades context

Section 1245

The item is a compactor, conveyor, hoist, baler, or similar material-handling asset.

Source: IRS Pub. 5653, retail matrix, PDF p. 177IRS Pub. 5653, residential rental matrix, PDF pp. 314 to 315

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The cost is for the dock, canopy, overhead door, permanently installed leveler, plate, seal, light, or another part of the receiving structure.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 314 to 31526 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Separate vendor equipment schedules from the general-contractor dock package before allocating indirect costs.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Surface parking plan with curbs and stripingA plan view marks paved stalls, striping, bumper blocks, a curb, and a landscape island.paving + stripingcurbisland
Site improvements15-year

Parking lots, curbs, and striping

Grade-level parking and its ordinary site appurtenances are common Asset Class 00.3 candidates.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

The cost is grade-level surface parking, paving, bumper blocks, curb cuts, curb work, striping, islands, perimeter fences, sidewalks, or parking-control equipment.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 314 to 315IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Not the same asset
27.5- or 39-year

Section 1250

An attached garage or parking structure is part of residential rental property, or a stand-alone parking structure is nonresidential real property.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 314 to 31526 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Exclude land and general site-preparation cost. Allocate only depreciable construction tied to the parking improvement.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Roadway and sidewalk sectionA roadway, curb, and raised pedestrian walk are shown as constructed site layers over grade.sidewalkcurbroadwayfinished grade
Site improvements15-year

Roadways, driveways, sidewalks, and curbs

Constructed circulation surfaces are distinct from the underlying land and general grading.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

Grade-level roads, driveways, base areas, guardrails, curb cuts, curbs, and sidewalks are constructed of asphalt, concrete, brick, stone, or similar materials.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 317 to 318IRS Pub. 5653, residential rental matrix, PDF pp. 318 to 319IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually not depreciable separately
Land

Nondepreciable land

The cost is initial clearing, stripping, mucking, or general grading that prepares the site rather than finish grading tied to the constructed improvement.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 309 to 310

What to document

Off-site work transferred to a municipality and public-access improvements can require separate ownership and basis analysis.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Fence, retaining wall, and fountain on a siteThree distinct constructed improvements sit on the land outside the building.fenceretaining wallfountain
Site improvements15-year

Fences, gates, retaining walls, and fountains

These constructed site features commonly sit in Asset Class 00.3 when they are depreciable and not part of a building.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

The improvement is directly to or added to land, such as a fence, gate, retaining wall, fountain, drainage facility, detention pond, or irrigation system.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 305IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The guardrail, wall, gate, or water feature is integrated into the building or primarily serves its operation or maintenance.

Source: 26 C.F.R. Section 1.48-1(e), buildings and structural componentsIRS Publication 5653 (2-2025), Cost Segregation Audit Techniques Guide

What to document

Confirm the feature is owned, depreciable, and not explicitly assigned to another activity class.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Plantings tied to a building and general landOne planting bed sits in a building work zone while a mature tree remains independent on the broader site.replacement-linkedgeneral land
Site improvements15-year

Landscaping and shrubbery

The key IRS matrix question is whether replacing the depreciable improvement would destroy the landscaping.

Land-improvement candidate
15-year

Asset Class 00.3

The landscaping would be destroyed when the related depreciable asset, such as the building or a paved improvement, is replaced.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 312 to 313IRS Publication 946 (2025), property classes and recovery periods

Compare the boundary and sources
Usually part of land
Land

Nondepreciable land

The general site landscaping would remain if the building or other depreciable improvement were replaced and is inextricably associated with the land.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 312 to 313

What to document

A photograph is not enough. Site plans and replacement logic should support the allocation between depreciable landscaping and land.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Freestanding light pole illuminating a parking areaA pole and concrete footing stand apart from a building-mounted entrance fixture.site light + footingbuilding light
Site improvements15-year

Pole-mounted or freestanding site lighting

Mounting and served area separate a site-light system from lighting attached to and operating the building.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

A pole-mounted or freestanding system illuminates sidewalks, parking, or recreation areas and includes its site foundation and associated site components.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 302IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 314IRS Pub. 5653, residential rental matrix, PDF p. 315

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The fixture is mounted on the building and illuminates entrances, walkways, or parking as part of building operation and safety.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 301IRS Pub. 5653, residential rental matrix, PDF pp. 313 to 31426 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Exterior location alone does not make a fixture a land improvement.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Underground electrical run serving site improvementsA buried conduit leaves a site panel and branches to a light pole and outdoor pump instead of entering the building.site panelburied site runpump
Site improvements15-year

Site electrical serving outdoor improvements

Follow the run: power to a site improvement can follow that improvement, while utility service to the building generally does not.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

Electrical service runs to outdoor lighting, sump pumps, exterior receptacles not attached to the building, or other land-improvement equipment.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 304

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

Water, sanitary sewer, gas, or electrical utility service runs from the property line to and serves the building.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 32026 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Site utility classifications can differ by activity class. Trace endpoints and consult the applicable industry matrix.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Freestanding gazebo separated from an attached deckA detached gazebo and ground patio sit on the site while a deck is visibly connected to the building.freestanding amenityattached deck
Site improvements15-year

Freestanding decks, gazebos, and patios

Physical separation from the building is a central boundary for these outdoor amenities.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

An inherently permanent deck or gazebo is not attached to a building, or a ground-level paved patio adjoins the property as a constructed land improvement.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 300IRS Pub. 5653, residential rental matrix, PDF pp. 314 to 315

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

A deck, porch, portico, or porte-cochere is attached to, supported by, or integrated with the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 300IRS Pub. 5653, residential rental matrix, PDF p. 31526 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

“Outdoor” does not equal 15-year. Show the structural relationship and how removal affects the building.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Outdoor pool and court beside a buildingA pool, deck, and marked court are drawn on the land outside the building footprint.pool + deckoutdoor court
Site improvements15-year

Outdoor pools, courts, and playground improvements

Exterior location and site construction distinguish these amenities from recreation spaces integrated with a building.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

An outdoor pool or spa and associated equipment, athletic court, or playground equipment is built on land outside the residential building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 298IRS Pub. 5653, residential rental matrix, PDF p. 299

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The pool, spa, or athletic court is within, on, or attached to the building and forms part of the building facility.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 29926 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Equipment may need its own activity-class analysis. Do not assume every pump or filtration component follows the same life as the pool shell.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Monument sign split into structure and message faceA freestanding sign shows a permanent base and pylon supporting a separable message panel.message facestructure + footing
Site improvements15-year5-year

Monument or pylon sign structure

The support structure and the changeable message face are separate assets in the IRS residential matrix.

Structure candidate
15-year

Asset Class 00.3, Sections 1245/1250

The pylon, pole, or monument is set in the ground or on a concrete foundation and supports signage.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

Compare the boundary and sources
Message-face candidate
5-year in the cited context

Section 1245, Asset Class 57.0

The cost is only the sign face, message screen, brand panel, images, and related components rather than the supporting monument.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

Usually stays with the building
27.5- or 39-year

Section 1250

A room number, exit sign, restroom identifier, or similar sign relates to operation, maintenance, or life safety of the building.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 318 to 319IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

What to document

Split the sign vendor invoice between foundation, structure, electrical/site work, and replaceable display components.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Replaceable electronic message screen on a pylonThe illuminated screen is lifted away from the permanent supporting pylon and footing.replaceable screenpermanent support
Equipment and furnishings5-year15-year

Sign face or electronic message screen

Treat the display as its own asset only when cost records and construction support separating it from the site structure.

Shorter-life candidate
5-year in the cited context

Section 1245, Asset Class 57.0

The asset is the sign face, replaceable message screen, brand image, or related display component.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

Compare the boundary and sources
Land-improvement support
15-year

Asset Class 00.3, Sections 1245/1250

The cost is the pylon, monument, pole, concrete foundation, or other permanent site support.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 299IRS Pub. 5653, residential rental matrix, PDF pp. 319 to 320

What to document

Electrical service to the sign may follow the site improvement rather than the screen; trace and allocate it.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Site access gate with reader and cameraA freestanding gate, keypad, camera, and buried conduit control entry to the property.gate + site conduitreader
Site improvements15-year

Site security gate and access system

The residential matrix treats site access protection differently from a security system installed in the building.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

The gate, card or keyless access, cameras, monitors, wiring, and conduit limit access to and protect the site and residents.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 318 to 319

Compare the boundary and sources
Usually stays with the building
27.5-year in the cited residential context

Section 1250

Locks, cameras, motion detection, lighting, alarms, wiring, and conduit protect the building, its contents, and occupants as a building security system.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 318 to 31926 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

Commercial security treatment can differ by industry and function. The 15-year result here is tied to the cited residential site-gate fact pattern.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Three-way split between site footing, building footing, and general gradingA sign footing and paved-area base are separated from a building foundation and broad undisturbed site grade.site footingbuilding foundationgeneral grade
Site improvements15-year

Grading and footings for specific site improvements

Below-grade cost follows what it directly supports; general site preparation remains a land cost.

Land-improvement candidate
15-year

Asset Class 00.3, Sections 1245/1250

Excavation, backfill, reinforcement, concrete, base course, or fine grading directly constructs a sign, light pole, parking lot, road, sidewalk, or another depreciable site improvement.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 299IRS Pub. 5653, residential rental matrix, PDF pp. 309 to 310

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The excavation, backfill, footing, foundation, and grading are necessary to set and support the building.

Source: IRS Pub. 5653, residential rental matrix, PDF p. 299IRS Pub. 5653, residential rental matrix, PDF pp. 309 to 31026 C.F.R. Section 1.48-1(e), buildings and structural components

Usually part of land
Land

Nondepreciable land

Initial clearing, stripping, mucking, or general site grading prepares the land and would not need to be repeated when a particular depreciable improvement is replaced.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 309 to 310

What to document

Civil and structural drawings are the evidence. A percentage allocation with no quantity takeoff is weak support.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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Detached dumpster enclosure beside an attached service bayA freestanding enclosure sits on a concrete pad away from the building while another enclosure forms part of the wall.freestandingattached
Site improvements15-year

Freestanding trash enclosure

Attachment and integration with the shell control the boundary between site improvement and building component.

Land-improvement candidate
15-year

Asset Class 00.3, Section 1250 in the cited matrix

A permanent waste-receptacle enclosure is detached from the building and constructed on a concrete pad with posts set in the site.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 320 to 321

Compare the boundary and sources
Usually stays with the building
27.5- or 39-year

Section 1250

The enclosure attaches to and forms an integral part of the building shell and cannot be moved without damage to the building.

Source: IRS Pub. 5653, residential rental matrix, PDF pp. 320 to 32126 C.F.R. Section 1.48-1(e), buildings and structural components

What to document

The receptacle or compactor itself can be separate equipment; this entry addresses the constructed enclosure.

Sources used for this entry

IRS Publication 5653 is examination guidance, not an official IRS pronouncement or a substitute for the Code, regulations, and applicable revenue procedures.

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A component list is not a cost segregation study

The atlas helps you ask better questions. An engineer still has to measure the component, trace the systems, allocate indirect costs, and tie the result to your basis. Your CPA then determines whether the deduction is usable and implements it on the return.

Book your free 30-minute cost segregation tax fit callEstimate the deduction first

Why the Category Matters

Same dollars, very different timing.

Take a $100,000 component in a commercial building. Left in the 39-year building, it deducts about $2,564 a year. If it is supported as 5-year property acquired after January 19, 2025 and qualifies for 100% bonus depreciation, the full $100,000 can be deducted in the year it is placed in service. Total depreciation over the life of the property is the same; the study moves it forward, and a later sale can recapture it.

Certain interior improvements to a nonresidential building may qualify as 15-year qualified improvement property when the statutory conditions are met. Enlargements, elevators and escalators, and internal structural framework are excluded.

Whether the deduction helps this year depends on whether you can use the loss, which is where the real estate professional status and short-term rental rules come in. Start with the full guide to what a cost segregation study is and how it works.

Frequently Asked Questions

What are the cost segregation categories?

A cost segregation study sorts a building's cost into 5-year, 7-year and 15-year property, the building itself (27.5 years for residential rental property, 39 years for nonresidential), and land, which is not depreciable. The shorter-life categories are where the accelerated deductions come from.

What qualifies for cost segregation?

Components that are not structural parts of the building: personal property such as appliances, removable carpeting and furniture in a rental, office furniture and fixtures, and land improvements such as sidewalks, parking areas, fences and landscaping. Function, attachment and what a system serves decide each item, not whether it can be removed.

Does HVAC or a roof qualify for cost segregation?

Usually not as shorter-life property. A roof and central HVAC that serve the building are structural components that stay with the 27.5-year or 39-year building. On nonresidential property placed in service after the building, roofs, HVAC, fire protection and security systems can be Section 179 qualified real property, which is a separate election.

Are land improvements 15-year property?

Generally yes. Improvements made directly to land, such as sidewalks, roads, fences and shrubbery, are 15-year property. Land itself is not depreciable, and a building is not a land improvement.

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Know the categories. Then run the math.

Book a free 30-minute consultation with our team. Tell us what you need, learn how Taxstra can help, and explore whether our services are a good fit. Studies are performed by Engineered Tax Services, our cost segregation partner.

Tax planning slots are limited before year-end.

Next Steps

Filing it yourself is fine. Optimizing it is where the money is.

Getting the form right keeps you out of trouble. The strategies below are what actually lower the bill.

What is a cost segregation study?

How the study works, what it costs and when it pays off.

Cost segregation calculator

Compare year one with and without a study.

Guides by property type

What to review in 24 building types.

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Book your free 30-minute tax fit call with our team. Tell us what you need, learn how Taxstra can help, and explore whether our services are a good fit. Tax advice, document reviews, and analysis require a paid engagement.

Tax planning slots are limited before year-end.

Authoritative Sources

Citations reflect U.S. federal tax law as of the article's last reviewed date.

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