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Tax deductions, credits, and amortization

Where should depreciation of insulation be reported on IRS Form 4562?

Last updated: 
Sep 2025
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Answer

Depreciation of insulation should be reported on IRS Form 4562 in the section that corresponds to the type of property and the method of depreciation being used.

1. Step-by-step guidance:

Determine the Property Classification:

  • Insulation installed as part of a building is considered a structural component and is generally classified as part of the building itself (i.e., real property).
  • If the insulation is part of a nonresidential building, it is included in the basis of nonresidential real property (39-year property under MACRS).
  • If the insulation is part of a residential rental building, it is included in the basis of residential rental property (27.5-year property under MACRS).
  • If the insulation is part of a qualified improvement property (QIP) in a nonresidential building, it may be eligible for a 15-year recovery period and bonus depreciation, subject to specific requirements.

Where to Report on Form 4562:

Part III, Section B (Lines 19h and 19i):

  • For insulation that is part of residential rental property, report the depreciation on line 19h.
  • For insulation that is part of nonresidential real property, report the depreciation on line 19i.
  • Enter the month and year placed in service, basis for depreciation, recovery period (27.5 or 39 years), convention (mid-month), and method (straight line).

If the insulation is part of qualified improvement property (QIP):

  • QIP is generally 15-year property (if placed in service after 2017) and is depreciated using the straight line method under the half-year convention. Report QIP on the appropriate line for 15-year property (line 19g).

If the insulation is part of a building improvement that does not qualify as QIP:

  • It is depreciated as part of the building (27.5 or 39 years) and reported on line 19h or 19i, as above.

If the Insulation Is Not Part of a Building (Rare):

  • If, in an unusual case, insulation is installed as a separate asset not considered a structural component (for example, removable insulation for equipment), it may be classified as personal property and reported on the appropriate line for 5-, 7-, or 15-year property, depending on its use and classification.

2. Summary Table for Reporting Depreciation of Insulation on Form 4562:

Type of PropertyWhere to Report on Form 4562Recovery PeriodMethodConvention
Residential rental propertyLine 19h (Part III, Section B)27.5 yearsStraight LineMid-month
Nonresidential real propertyLine 19i (Part III, Section B)39 yearsStraight LineMid-month
Qualified improvement property (QIP)Line 19g (Part III, Section B)15 yearsStraight LineHalf-year
Personal property (rare for insulation)Line 19a–19g, as appropriate5, 7, 15 years200%/150% DB or SLHalf-year

3. Conclusion:

Depreciation of insulation is generally reported on Form 4562, Part III, Section B, on the line corresponding to the type of real property (line 19h for residential rental property, line 19i for nonresidential real property), unless it qualifies as QIP or is personal property, in which case it is reported on the appropriate line for that property class.

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