Quick overview

MACRS (Modified Accelerated Cost Recovery System) is the U.S. tax system for depreciating most tangible business and income-producing property placed in service after 1986. MACRS groups assets into class lives (3, 5, 7, 10, 15, 20 years, etc.) and uses an accelerated depreciation method for many personal property classes and straight‑line for most real property. See IRS Publication 946 for full rules (IRS Pub. 946).

How MACRS works — recovery periods and methods

  • Asset classes: MACRS assigns assets to recovery classes. Common examples: 3‑, 5‑, and 7‑year property (equipment, computers, vehicles); 15‑year (land improvements); 27.5‑year residential rental property; 39‑year nonresidential real property.
  • Methods: General Depreciation System (GDS) uses accelerated declining‑balance (200% or 150% DB) and then switches to straight‑line. ADS (Alternative Depreciation System) uses straight‑line over a longer recovery period and is required in certain cases (e.g., tax-exempt use property). Residential and nonresidential real property use straight‑line under GDS.
  • Conventions: MACRS applies conventions that determine the portion of the year allowed in the first and last year: half‑year (most personal property), mid‑quarter (if >40% of personal property placed in service in last quarter), and mid‑month (real property). These rules affect the first‑year deduction.

Reporting MACRS and required forms

  • Use IRS Form 4562 to report depreciation, elect Section 179, or claim special depreciation (Form 4562 instructions, IRS). Keep a depreciation schedule showing purchase date, cost basis, class life, and method.

Bonus depreciation and Section 179 (how they interact)

  • Section 179 lets taxpayers elect to expense qualifying property up to limits in the year placed in service, subject to business income limitations. Bonus depreciation allows an additional first‑year deduction for qualified property that meets the acquisition and placed‑in‑service rules.
  • Recent phase‑down of bonus depreciation: the percentage available phased down after its 100% period. Verify current year limits and percentages before applying bonus; check IRS guidance and Pub. 946 for that tax year.
  • For practical comparisons and examples, see our guide on Business Depreciation Basics: Section 179 and Bonus Depreciation.

Example (simple): 5‑year property

A $100,000 piece of qualifying 5‑year equipment under GDS generally uses the 200% declining‑balance switching to straight‑line with the half‑year convention. That produces a larger deduction in year 1 than straight‑line would, improving early cash flow. Exact percentages come from MACRS tables in Pub. 946.

Important tax considerations

  • Depreciation recapture: When you sell depreciated property, some or all of the gain may be treated as ordinary income under depreciation recapture rules (see our Depreciation Recapture guide). Section 1245 recapture typically applies to personal property; Section 1250 rules apply to real property.
  • ADS election: Required in some situations (e.g., foreign use property, tax‑exempt bond financed property) and available as an election for others. ADS generally increases tax now by reducing the annual deduction.
  • Life and classification mistakes: Misclassifying property or using the wrong convention triggers adjustments and can prompt amended returns.

Common mistakes to avoid

  • Failing to apply the mid‑quarter convention when required (overstates year‑one depreciation).
  • Mixing Section 179, bonus depreciation, and MACRS tables without checking taxable income limits and asset eligibility.
  • Neglecting to keep acquisition and placed‑in‑service documentation; these records are critical for audits.

Professional tips

  • Run a before‑and‑after cash flow model: compare using Section 179, bonus depreciation, and MACRS alone to decide which maximizes tax and business objectives.
  • Use reliable MACRS tables (IRS Pub. 946) or accounting software that applies the correct convention and switching rules automatically.
  • For rental property, maintain a separate depreciation schedule and remember to allocate basis between land and building (land is not depreciable).

Authoritative sources and next steps

Interlinked FinHelp resources

Professional disclaimer

This article is educational and does not replace personalized tax advice. For decisions about depreciation elections, bonus depreciation eligibility, or filing Form 4562 for your tax return, consult a qualified tax professional or the IRS guidance listed above.