What Is ACRS Depreciation and How Does It Work?

The Accelerated Cost Recovery System, known as ACRS, is the federal tax depreciation method that applies to tangible business property placed in service between January 1, 1981, and December 31, 1986. ACRS depreciation works by assigning each eligible asset to a fixed recovery class, then multiplying the asset’s unadjusted basis by a statutory percentage for each year of that class. Congress created the system through the Economic Recovery Tax Act of 1981 to replace useful-life estimates with a simpler, front-loaded schedule that encouraged capital investment.¹

No new property can enter ACRS, but the system still governs assets placed in service during that window and any later sale of those assets. If you are looking at an old fixed-asset schedule, or preparing to dispose of a building or piece of equipment first placed in service in the early 1980s, the ACRS rules are the ones that apply.

Property That Qualifies

ACRS covers tangible property placed in service after December 31, 1980, and before January 1, 1987. That includes personal property used in a trade or business, such as vehicles, machinery, and equipment, and real property such as commercial buildings and rental housing. For recapture purposes, the IRS sorts these assets into section 1245 property (generally personal property) and section 1250 property (real property that is or has been depreciated).¹

Some assets are excluded. Intangibles like patents, copyrights, and goodwill do not qualify. Assets depreciated on a non-time-based method, such as unit-of-production or income-forecast, sit outside the standard ACRS tables. Public utility property required a normalization method of accounting, tracking the gap between accelerated tax depreciation and the slower depreciation used in regulated rate calculations, or ACRS treatment was lost entirely.¹

Recovery Classes and Statutory Percentages

Instead of asking how long a particular piece of equipment might last, ACRS assigned every eligible asset to one of a few recovery classes with percentages set by statute. Taxpayers looked up the right table and multiplied.

Three-Year Property

This class covered automobiles, light-duty trucks with an unloaded weight under 13,000 pounds, over-the-road tractor units, racehorses over two years old, and any other horse over twelve years old when placed in service. The percentages were 25 percent in year one, 38 percent in year two, and 37 percent in year three.¹

Five-Year Property

Five-year property was the default class for most tangible personal property not assigned elsewhere: computers, copiers, office furniture, industrial machinery, single-purpose agricultural structures, and petroleum storage facilities other than buildings. Deductions ran 15 percent in year one, 22 percent in year two, and 21 percent in each of years three through five.¹

Ten-Year Property

A narrower category that included theme-park structures, manufactured homes (including mobile homes), railroad tank cars, and certain public utility property. The percentages started at 8 percent in year one, rose to 14 percent in year two, then stepped down: 12 percent in year three, 10 percent in each of years four through six, and 9 percent in each of years seven through ten.¹

Real Property

Real property under ACRS changed several times. Buildings placed in service before March 16, 1984, used a 15-year class. The Deficit Reduction Act of 1984 stretched that to 18 years for property placed in service from March 16, 1984, through May 8, 1985, and a later change pushed it to 19 years for property placed in service from May 9, 1985, through the end of 1986.¹

Unlike personal property, real property percentages vary by the month the building was placed in service. A 15-year building placed in service in January of a given year got a 12 percent deduction that first year, while one placed in service in December got only 1 percent. Low-income housing had its own tables with slightly more generous percentages. Publication 534 contains fourteen separate real property tables covering every combination of recovery period, placement date, and elected method.

How the Calculation Works

The math is straightforward. Multiply the asset’s unadjusted basis, typically the purchase price plus sales tax and delivery, by the statutory percentage for the corresponding recovery year. You do not subtract salvage value first, which was a real simplification compared with the pre-1981 rules.¹

For personal property in the three-, five-, and ten-year classes, the half-year convention is already built into the statutory percentages. The tables treat every asset as if placed in service at the midpoint of the tax year, regardless of the actual purchase date. That is why the first-year percentage for five-year property is 15 percent rather than a full 30 percent, and no separate half-year adjustment is needed.

Real property is different. For 15-year real property and 18-year property placed in service before June 23, 1984, a full-month convention applies, and you get no deduction for the month of disposition. For 18-year property placed in service after June 22, 1984, and for all 19-year property, a mid-month convention applies instead, treating dispositions as occurring at the midpoint of the month.¹

Passenger automobiles are a common trap. Section 280F imposed separate annual dollar caps that override the ACRS percentages. If the tabular ACRS deduction on a car exceeded the Section 280F ceiling, the ceiling controlled, and any unrecovered basis carried forward into later years within the same annual limits.

The Straight-Line Alternative

A taxpayer could elect the alternate ACRS method, which used straight-line depreciation over a longer recovery period. The election was irrevocable and applied to all property in the same class placed in service in the same year. The available alternate periods were:

Three-year property: 3, 5, or 12 years.
Five-year property: 5, 12, or 25 years.
Ten-year property: 10, 25, or 35 years.
15-year real property: 15, 35, or 45 years.
18-year real property: 18, 35, or 45 years.
19-year real property: 19, 35, or 45 years.

The choice mattered beyond cash-flow smoothing. Electing straight-line for real property changed the recapture rules on a later sale, potentially converting what would have been ordinary income into lower-taxed capital gain. That trade-off between larger deductions now and better treatment on sale later was one of the more consequential decisions a property owner made under ACRS.¹

ACRS Versus MACRS

The Tax Reform Act of 1986 replaced ACRS with the Modified Accelerated Cost Recovery System, or MACRS, for property placed in service after 1986. If your asset went into service on or after January 1, 1987, MACRS applies, not ACRS.

MACRS generally assigns longer recovery periods. Automobiles moved from three-year to five-year property. Most equipment that was five-year ACRS property became either five-year or seven-year MACRS property. Nonresidential real property went from 19 years under late-era ACRS to 31.5 years under the original MACRS rules, and eventually to 39 years.²

The method changed too. Where ACRS uses congressionally prescribed percentage tables, MACRS generally applies 200 percent declining balance for personal property, switching to straight-line when that produces a larger deduction. MACRS requires more math but aligns deductions more closely with the actual decline in economic value.

Depreciation Recapture When You Sell

Selling or otherwise disposing of ACRS property triggers depreciation recapture, which converts some or all of the gain from ordinary treatment into capital, or the reverse. How much gets recharacterized depends on whether the asset is section 1245 or section 1250 property.

Section 1245 Property

For personal property like equipment and vehicles, recapture is total. The gain treated as ordinary income equals the lesser of the total depreciation previously claimed or the gain on the sale. If you sell a piece of five-year ACRS equipment for more than its depreciated value, every dollar of prior depreciation returns as ordinary income up to the amount of your gain.³

Here is where ACRS real property surprises people. Most ACRS real property depreciated under the accelerated tables is treated as section 1245 property for recapture, meaning full recapture of all prior depreciation. That is harsher than the treatment of MACRS real property, which is generally section 1250 property subject only to partial recapture.⁴

Section 1250 Property

The narrower group of ACRS real property that qualifies for section 1250 treatment includes residential rental property, property used predominantly outside the United States, and property for which the taxpayer elected straight-line depreciation. For these assets, only the “additional depreciation” is recaptured as ordinary income, meaning the amount by which total claimed depreciation exceeds what straight-line would have produced. If you elected straight-line from the start, there is no excess and no ordinary-income recapture, though any remaining gain is still taxed as capital gain.⁵

All ACRS recapture is reported on Part III of IRS Form 4797, Sales of Business Property. The form walks through the calculation, starting with total depreciation allowed or allowable and applying the correct recapture rule for the property type.⁴

When ACRS Still Matters Today

Two situations keep ACRS on current tax returns. The first is real property on a long alternate recovery period. A building placed in service in 1986 under a 45-year straight-line election will not be fully depreciated until 2031, and you continue to claim ACRS deductions each year using the original tables and conventions.¹

The second is dispositions. Whenever someone sells, exchanges, or otherwise disposes of property originally depreciated under ACRS, the recapture calculation uses the original ACRS rules regardless of when the sale occurs. A commercial building placed in service in 1983 and sold in 2026 still requires a section 1245 or 1250 analysis based on the ACRS depreciation claimed over the years, and getting it wrong can mean a substantial underpayment of tax.

For both situations, IRS Publication 534 remains the primary reference. It contains the statutory percentage tables, the rules for each convention, and the alternate recovery period schedules. The publication was last revised in November 2016 and is still available on the IRS website.¹

1
Internal Revenue Service. Publication 534 (11/2016), Depreciating Property Placed in Service Before 1987
2
Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System
3
Office of the Law Revision Counsel. 26 US Code 1245 – Gain From Dispositions of Certain Depreciable Property
4
Internal Revenue Service. 2025 Instructions for Form 4797 – Sales of Business Property
5
Office of the Law Revision Counsel. 26 US Code 1250 – Gain From Dispositions of Certain Depreciable Realty