Section 179 deduction and the special depreciation allowance are two distinct tax benefits available for qualifying business property under IRS Form 4562. The Section 179 deduction allows taxpayers to expense the cost of qualifying property in the year it is placed in service, up to a specified annual limit. The special depreciation allowance, also known as the "bonus depreciation," provides an additional deduction for qualified property, typically calculated as a percentage of the depreciable basis.
Section 179 Expense Deduction
The Section 179 deduction is claimed on Part I of Form 4562. Taxpayers must reduce the depreciable basis of the property by the amount of the Section 179 deduction when calculating any subsequent depreciation or amortization, including special depreciation allowances. This reduction is required to avoid double-counting deductions. The deduction is subject to annual limits and phase-out thresholds based on total asset purchases.
Special Depreciation Allowance
The special depreciation allowance is reported on Part II of Form 4562 and applies only to qualified property placed in service during the tax year. It is an additional deduction taken after any Section 179 deduction and before regular MACRS depreciation. The allowance is calculated by multiplying the depreciable basis (cost minus any applicable credits or deductions) by the applicable percentage.
Key Rules and Interactions
- Order of Deductions: Section 179 deduction must be computed before applying the special depreciation allowance or regular depreciation (as per instructions for line 26, column (i) in Part V).
- Basis Reduction: The depreciable basis is reduced by Section 179 deductions, special depreciation allowances, and other credits (e.g., disabled access credit, energy efficiency credits). This affects both the special allowance and regular depreciation.
- Listed Property Restrictions: Listed property (e.g., vehicles, computers) used 50% or less in qualified business use does not qualify for Section 179 or special depreciation allowance.
- Carryover: Any disallowed Section 179 deduction can be carried forward to future years (e.g., from line 13 to line 10 of Form 4562).
Reporting Requirements
Taxpayers must report the Section 179 deduction on line 12 of Part I and the special depreciation allowance on line 14 of Part II. For listed property, special depreciation allowance is reported on line 25 of Part V. If using non-MACRS methods (e.g., unit-of-production), additional details must be attached to line 15.
Source:
Form 4562 Instructions (PDF)
Disclaimer: Always verify details with current IRS forms, instructions, and publications. For complex situations, consult a CPA or tax attorney.