Modified Accelerated Cost Recovery System (MACRS): Explanation and Types
By Markets & Investing DeskUpdated Nov 10, 2026
Definition
MACRS is the U.S. federal tax method for depreciating most business property placed in service after 1986, spreading cost over IRS-set recovery periods with front-loaded deductions.
Key takeaways
- Computers, automobiles and light trucks are 5-year property, deducted over six tax years under the half-year convention.
- Residential rental property uses 27.5 years and nonresidential real property uses 39 years, both straight line.
- The mid-quarter convention applies when over 40% of personal property basis is placed in service in the last three months.
- ADS is required for listed property used 50% or less for business and for property used mainly outside the U.S.
The Modified Accelerated Cost Recovery System (MACRS) is the U.S. federal income tax method for depreciating most business and investment property placed in service after 1986. It assigns each asset to a recovery period set by the IRS and spreads the asset’s cost basis over that period through annual deductions. For most personal property, the deductions are front-loaded, so more of the cost is deducted in the early years and less in the later ones.
How MACRS works
The Internal Revenue Service treats depreciation as an annual allowance for wear and tear, deterioration or obsolescence of property used to produce income. Under MACRS, the deduction for any year follows from three settings.
Property class (recovery period). The IRS places assets into classes with fixed recovery periods.
Depreciation method. GDS uses one of three methods, depending on the class:
- 200% declining balance for 3-, 5-, 7- and 10-year property
- 150% declining balance for 15- and 20-year property (and optionally for shorter classes)
- Straight line for residential rental and nonresidential real property
Under a declining balance method, the business switches to straight line in the first year that straight line produces an equal or larger deduction. The published MACRS tables already build in that switch.
Convention. The convention sets how much of the first year counts:
- Half-year: property is treated as placed in service at the midpoint of the year. This is the default for personal property.
- Mid-quarter: required when more than 40% of the depreciable basis of personal property placed in service during the year falls in the last three months of the tax year.
- Mid-month: used for both classes of real property.
Because of the half-year convention, a “5-year” asset is deducted over six tax years: only half a year is taken at the start, and the remaining half year falls in year six.
MACRS recovery periods under GDS
The main GDS classes, with typical examples from Publication 946:
| Recovery period | Examples |
|---|---|
| 3-year | Tractor units for over-the-road use, certain racehorses, qualified rent-to-own property |
| 5-year | Automobiles, light trucks, buses, computers and peripheral equipment, office machinery, breeding cattle |
| 7-year | Office furniture and fixtures, agricultural machinery, railroad track, property with no assigned class life |
| 10-year | Vessels, barges and tugs, single-purpose agricultural structures, fruit- or nut-bearing trees and vines |
| 15-year | Land improvements such as fences, sidewalks and shrubbery, municipal wastewater treatment plants |
| 20-year | Farm buildings, certain municipal sewers |
| 25-year | Water utility property, certain municipal sewers |
| 27.5-year | Residential rental property (80% or more of gross rental income from dwelling units) |
| 39-year | Nonresidential real property such as office buildings, stores and warehouses |
Land itself is never depreciable. Only the building and qualifying land improvements are.
Calculating MACRS depreciation
The core formula is:
Annual deduction = Depreciable basis × MACRS table percentage for that year
where the depreciable basis is the cost basis multiplied by the business-use percentage, reduced by any Section 179 expensing or bonus depreciation claimed on the asset.
Hypothetical example. A business buys a computer system for $10,000. It uses the system 100% for business, claims no Section 179 or bonus depreciation, and the half-year convention applies. Computers are 5-year property under GDS (200% declining balance).
| Tax year | Table rate | Deduction |
|---|---|---|
| 1 | 20.00% | $2,000 |
| 2 | 32.00% | $3,200 |
| 3 | 19.20% | $1,920 |
| 4 | 11.52% | $1,152 |
| 5 | 11.52% | $1,152 |
| 6 | 5.76% | $576 |
| Total | 100% | $10,000 |
The rates come from the mechanics. The straight-line rate for five years is 20%, so double declining balance is 40% of the remaining basis. The half-year convention halves the first year to 20%. Year 2 is 40% of the remaining 80%, which gives 32%. By year 4, declining balance and straight line over the remaining 2.5 years both produce 11.52%, so straight line takes over. The half year left over lands in year 6.
If the same computer were used 60% for business, the depreciable basis would be $6,000 and each year’s deduction would be 60% of the amounts above.
Seven-year property follows the same logic with different half-year rates: 14.29%, 24.49%, 17.49%, 12.49%, 8.93%, 8.92%, 8.93% and 4.46% across eight tax years.
Real property works differently. A building placed in service in its first month as 39-year nonresidential property is depreciated straight line, with the mid-month convention trimming the first and last years.
GDS vs. ADS: the two types of MACRS
General Depreciation System (GDS) is used for most property. It offers the shorter recovery periods and accelerated methods shown above.
Alternative Depreciation System (ADS) applies straight-line depreciation over generally longer periods. Under ADS, residential rental property placed in service after 2017 uses 30 years and nonresidential real property uses 40 years, and many personal property classes are lengthened as well.
ADS is required for, among other cases:
- Listed property, such as certain vehicles, used 50% or less for qualified business use during the year
- Tangible property used predominantly outside the United States
- Tax-exempt use property and tax-exempt bond-financed property
- Property in a farming business that elects out of the uniform capitalization rules
- Certain property of real property or farming businesses that elect out of the business interest limitation
A business may also elect ADS voluntarily. The election applies to all property in the same class placed in service during that tax year, and it cannot be revoked once made. Real property is the exception: ADS can be elected building by building. Moving existing assets from one method to another outside that election generally requires an accounting method change rather than a simple switch on the next return.
What MACRS excludes
MACRS does not apply to:
- Intangible property, which is generally amortized under separate rules (for example, Section 197 intangibles over 15 years)
- Films, videotapes and sound recordings
- Property the taxpayer elects to depreciate under a method not based on years, such as units of production
- Certain property acquired from related parties or in nontaxable transfers, where anti-churning rules preserve the prior owner’s method
Why MACRS matters for taxes
A depreciation deduction reduces taxable income without a cash outlay in that year, since the cash was spent when the asset was bought. Accelerating the deductions moves tax savings closer to the purchase date. At the 21% federal corporate rate, the $2,000 first-year deduction in the example above lowers federal tax by $420. Under straight line with the same half-year convention, the first-year deduction would be $1,000.
Total deductions over the asset’s life are the same either way: $10,000 of basis is recovered. MACRS changes the timing, and earlier deductions are worth more because of the time value of money. Depreciation is reported on Form 4562 with the tax return.
Limitations and common confusions
Tax books vs. financial books. MACRS is not accepted under GAAP. A company may deduct MACRS depreciation for tax purposes while reporting straight-line depreciation over an estimated useful life in its financial statements. The difference between the two creates deferred tax items.
Recovery period vs. useful life. In accounting, useful life is an estimate of how long an asset will produce income. A MACRS recovery period is a fixed statutory figure. A computer kept for eight years is still 5-year property.
Depreciation recapture. Faster deductions lower the asset’s adjusted basis. When the asset is sold for more than that adjusted basis, gain on personal property is generally taxed as ordinary income up to the depreciation taken (Section 1245) rather than at capital gains tax rates. Gain on real property has its own recapture treatment.
MACRS vs. ACRS. The Accelerated Cost Recovery System, introduced in 1981, applied to property placed in service from 1981 through 1986. The Tax Reform Act of 1986 replaced it with MACRS, which lengthened several recovery periods. Assets still on the books from the ACRS era keep their original method.
Interaction with expensing. Section 179 expensing and bonus depreciation can deduct some or all of an asset’s cost in the first year, leaving MACRS to apply only to any remaining basis. Limits and bonus percentages have changed repeatedly under tax legislation, so check them for the year the asset is placed in service.
Complexity. Choosing the wrong class or convention, or missing a mandatory ADS case, misstates deductions for every year of the recovery period. Publication 946 runs to more than 100 pages for this reason.
The Bottom Line
MACRS matters to any business or investor depreciating property for U.S. federal taxes. It recovers the same total basis as straight line but moves deductions earlier, which increases their value. Getting the class, convention and GDS or ADS choice right matters because errors carry through every year, and faster deductions can mean ordinary income recapture when the asset is sold.
