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MACRS Depreciation Calculator

Estimate your MACRS tax depreciation deduction for any recovery year and asset class.

How it is calculated

The tool looks up a fixed half-year-convention percentage for the chosen recovery class and year, then applies it to cost: deduction = cost × rate ÷ 100. The built-in tables cover only 3-, 5-, 7- and 10-year classes (the 5-year table is 20.00, 32.00, 19.20, 11.52, 11.52 and 5.76 percent, six years in all). accumulated adds the deductions from year 1 up to the chosen year, and book_value = cost − accumulated. Class and year must be whole numbers: 2.5 or a class of 5.5 shows no result, as does any other class, a year of 0, or a year beyond the table (year 7 for a 5-year asset). Cost must be above zero. No Section 179, bonus depreciation, mid-quarter convention or salvage value is applied, and the percentages follow U.S. rules, so other countries differ.

Worked example

A business buys equipment for $30,000 that falls in the 5-year class, and we look at year 2. The table gives 32.00% for year 2, so the deduction is 30,000 × 32% = $9,600.00. Year 1 was 20%, which is $6,000, so accumulated depreciation is 6,000 + 9,600 = $15,600.00. Book value: 30,000 − 15,600 = $14,400.00. By year 6 accumulated depreciation reaches the full $30,000 and book value is $0.00.

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Common mistakes

  • Entering the asset's useful life in years as the recovery class. The class is a fixed IRS-style category, and only 3, 5, 7 and 10 work here; other values show no result.
  • Expecting a full year of depreciation in year 1. With the half-year convention year 1 gets only 20 % for a 5-year asset, and the remainder spills into a sixth year.
  • Entering a year beyond the table. A 5-year asset has six table years, so year 7 returns nothing; a 3-year asset has four.
  • Subtracting salvage value first. MACRS ignores salvage, so enter the full cost; the book value ends at $0.00.
  • Treating the figure as final without checking other write-offs. Section 179 expensing or bonus depreciation may change the deduction, and neither is modelled here.

Sources

About this calculator

MACRS (Modified Accelerated Cost Recovery System) is the depreciation method the IRS requires for most business assets placed in service after 1986, detailed in IRS Publication 946. Instead of depreciating an asset evenly over its life, MACRS front-loads larger deductions in the earlier years using a declining-balance method, then switches to straight-line depreciation partway through the recovery period once that produces a larger deduction.

Assets are grouped into IRS recovery classes based on their expected useful life — 3-year property (some tools), 5-year property (vehicles, computers, office equipment), 7-year property (office furniture, most other business equipment), and 10-year property, among others — and most businesses apply the half-year convention, which treats an asset as if it were placed in service exactly halfway through its first year regardless of the actual purchase date, giving a half-deduction in year one and a half-deduction in the final year.

Business owners and accountants use MACRS depreciation calculations every tax year to determine the deductible depreciation expense for a given asset and recovery year, often comparing it against Section 179 expensing or bonus depreciation as alternative ways to write off the same purchase faster.

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