商业房产折旧计算器 — 公式

Commercial Property Depreciation

Commercial real estate (office, retail, industrial) uses a 39-year straight-line depreciation schedule for the building structure.

Building Depreciation

Annual Depreciation = (Purchase Price - Land Value) / 39

Tenant Improvements

Qualified leasehold improvements may be depreciated over 15 years using straight-line, which is faster than the 39-year building schedule.

Important Distinctions

  • 39-year: Non-residential buildings placed in service after 1993
  • 27.5-year: Residential rental property (80%+ of rental income from dwelling units)
  • 15-year: Land improvements, qualified leasehold improvements
  • Land is never depreciable

    • Mid-Month Convention

    The first and last years of depreciation use a mid-month convention, meaning you get a partial deduction based on the month placed in service.

    计算示例

    A $1,200,000 commercial building with $300,000 land value and $50,000 in tenant improvements. 35% tax rate.

    1. Depreciable basis: $1,200,000 - $300,000 = $900,000
    2. Annual building depreciation: $900,000 / 39 = $23,077
    3. Annual TI depreciation: $50,000 / 15 = $3,333
    4. Total annual depreciation: $23,077 + $3,333 = $26,410
    5. Annual tax savings: $26,410 x 35% = $9,244
    6. Monthly depreciation: $26,410 / 12 = $2,200.83