Personal Property vs. Real Property in a Cost Seg Study: What Gets Reclassified and Why

Every cost segregation study is built on a single fundamental question: is this component personal property (5-year or 7-year MACRS) or real property (27.5-year or 39-year MACRS)? Get the classification right, and you can legitimately accelerate tens of thousands of dollars in depreciation into year one. Get it wrong — or fail to make the argument at all — and you're leaving money on the table.

The distinction between personal and real property isn't arbitrary. It's based on IRS case law, Revenue Rulings, and engineering principles that have been refined over decades. Understanding the framework helps you understand what a cost segregation study is actually doing — and why it holds up to IRS scrutiny.

The Core Distinction: Section 1245 vs. Section 1250 Property

The IRS tax code uses two primary categories for depreciable property. Section 1245 property (personal property) includes tangible personal property, most machinery and equipment, and certain structural components that serve a non-structural function. Section 1250 property (real property) includes buildings and structural components — the parts that define the building's physical structure and envelope.

The distinction matters for two reasons: depreciation speed (5-year vs. 27.5-year) and bonus depreciation eligibility. Section 1245 personal property is eligible for 100% bonus depreciation under the OBBBA (signed July 4, 2025). Section 1250 real property is generally not eligible for bonus depreciation under standard rules (though QIP has its own rules).

The Functional Test: How Engineers Classify Components

Cost segregation engineers apply several tests — informed by court cases and IRS guidance — to determine whether a component is personal or real property. The primary analysis looks at: (1) Does the component serve the building's structural function, or does it serve the specific business use of the property? (2) Can the component be removed without destroying the building? (3) Is the component specifically designed for the use of the property?

What Typically Gets Reclassified as Personal Property (5-Year)

• Furniture and fixtures: Beds, sofas, chairs, dining tables, nightstands, desks, lamps — clearly personal property
• Appliances: Refrigerators, dishwashers, washing machines, dryers, microwaves (free-standing or easily removable)
• Floor coverings: Carpet, area rugs, removable flooring (note: hardwood or tile installed as permanent floor covering may be real property)
• Decorative elements: Art, mirrors, decorative lighting fixtures serving aesthetic rather than structural functions
• Electronics and technology: Televisions, smart home devices, security systems, streaming equipment
• Window treatments: Curtains, blinds, shades that serve the rental use rather than structural weather protection

What Gets Reclassified as Land Improvements (15-Year)

• Driveways and parking areas: Asphalt, concrete pads, gravel driveways
• Landscaping and outdoor improvements: Grading, plantings, retaining walls, exterior fences
• Outdoor recreation amenities: Pools, hot tubs, decks, patios, fire pits, outdoor kitchens
• Exterior lighting: Landscape lighting, pathway lights, security lighting not attached to the building structure
• Sidewalks and curbing: Walkways, curbs, decorative stonework not part of the building foundation

What Stays as Real Property (27.5-Year)

Not everything can be reclassified. The structural shell of the building — and the components that define and maintain that shell — remains real property regardless of how detailed the cost segregation study is. These include:

• Foundation, framing, and structural walls: The physical structure of the building
• Roof structure and permanent roofing materials: The building envelope
• Permanently installed HVAC systems: Central systems built into the structure (vs. portable units)
• Plumbing rough-in and permanent fixtures: Pipes, drain lines, permanently installed toilets and showers
• Electrical rough-in: Wiring, panels, permanently installed outlets and switches
• Permanently installed flooring: Tile, hardwood, and flooring materials that are bonded or otherwise permanently attached

The Gray Areas: Where Engineers Earn Their Fee

Some of the most valuable reclassifications aren't obvious — they require engineering judgment and knowledge of applicable Revenue Rulings and court cases. Examples include: special electrical wiring installed to serve specific equipment (may be personal property), HVAC systems installed specifically for data or equipment cooling (may be personal property), decorative millwork and finish carpentry installed for aesthetic purposes beyond structural needs.

This is why cost segregation studies from qualified engineers — not software-generated reports — command higher fees and produce more defensible results. An experienced engineer knows which gray-area arguments hold up to IRS scrutiny and which are overreaches.