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Tax deductions, credits, and amortization

Where can taxpayers find IRS guidance on properly implementing the Alternative Depreciation System in their tax filings?

Last updated: 
Sep 2025
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Taxpayers can find IRS guidance on properly implementing the Alternative Depreciation System (ADS) in several authoritative sources, which provide both the legal requirements and practical instructions for applying ADS in tax filings:

1. Internal Revenue Code (IRC) § 168(g)


This section of the Code establishes the Alternative Depreciation System, specifying when ADS must be used (such as for property used predominantly outside the United States, tax-exempt use property, tax-exempt bond-financed property, imported property, and certain other categories), and that ADS uses the straight-line method over longer recovery periods than the General Depreciation System (GDS).

2. IRS Publication 946, "How to Depreciate Property"


Publication 946 provides comprehensive guidance on depreciation, including a dedicated discussion of ADS. It explains:

  • When ADS is required or may be elected,
  • The applicable recovery periods for different types of property under ADS,
  • The straight-line method requirement,
  • How to make the election to use ADS (generally by completing the appropriate section of Form 4562),
  • How to report ADS depreciation on tax returns,
  • The differences between GDS and ADS, and
  • How to use the tables for ADS recovery periods.

3. Instructions for Form 4562, "Depreciation and Amortization"


The instructions for Form 4562 provide step-by-step directions for reporting ADS depreciation. They specify:

  • Which lines and sections to use for ADS property (notably, Part III, Section C for property placed in service during the current year),
  • How to determine the correct recovery period and convention,
  • How to elect ADS for eligible property,
  • How to report depreciation for property required to use ADS,
  • The requirement to use the straight-line method over the ADS recovery period, and
  • How to handle property conversions and elections.

4. Revenue Procedure 87-56 and IRS Tables


Rev. Proc. 87-56 (as updated) provides the class lives and recovery periods for property under both GDS and ADS. Appendix B of Publication 946 and the tables in the Form 4562 instructions summarize these periods and help taxpayers determine the correct ADS recovery period for each asset class.

Summary of Steps for Implementing ADS:

-Determine if ADS is required or if you wish to elect it.- Identify the correct ADS recovery period for each asset using IRS tables (Publication 946, Form 4562 instructions, or Rev. Proc. 87-56).

- Use the straight-line method over the ADS recovery period.- Apply the appropriate convention (half-year, mid-month, or mid-quarter) as specified.

- Report ADS depreciation on Form 4562, Part III, Section C for current-year property, or on the appropriate line for prior-year property.

- Maintain documentation supporting the classification, recovery period, and method used.

By consulting these sources, taxpayers can ensure they are properly implementing ADS in their tax filings in accordance with IRS requirements.

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