MACRS, the Modified Accelerated Cost Recovery System, is the tax depreciation system used to recover the basis of most business and investment property placed in service after 1986 (IRS, Publication 946, How To Depreciate Property). For every asset it reaches it fixes three things: the applicable depreciation method, the applicable recovery period and the applicable convention (26 U.S.C. 168(a)). It lives in the tax law rather than in the accounting standards, so the same asset can carry one depreciated amount in a client’s own records and a different one on the return.
The Three Things MACRS Fixes
Each of the three is assigned by the statute rather than estimated by the preparer.
The method arrives with the property class. A 200 percent declining balance method that switches to straight line runs the shorter classes, 150 percent is substituted for 15-year and 20-year property, and straight line is required outright for real property and for several named categories (26 U.S.C. 168(b)). The rate arithmetic and the year the switch lands are in accelerated depreciation, and the full list the statute keeps on straight line is in straight line depreciation.
The recovery period is read off a statutory table keyed to the property class, so 5-year property runs five years and 7-year property runs seven, whatever the asset’s real service life turns out to be (26 U.S.C. 168(c)).
The convention decides how much of the first year and the last year the asset gets. Half-year is the default, real property takes mid-month, and a year in which purchases bunch into the last 3 months can push the rest of that year’s property onto mid-quarter (26 U.S.C. 168(d)). How each convention divides those years, and the test that triggers the mid-quarter one, are in prorated.
Two estimates a book schedule cannot avoid disappear under this system. Salvage value is treated as zero (26 U.S.C. 168(b)(4)), which is the ground salvage value covers, and estimated useful life is displaced by the assigned recovery period.
GDS and ADS
MACRS is not one schedule but two systems. The term includes the General Depreciation System (GDS) and the Alternative Depreciation System (ADS) (IRS, Instructions for Form 4562, 2025). GDS is the default, and a taxpayer must generally use it unless the law specifically requires ADS or the taxpayer elects into ADS (IRS, Publication 946, How To Depreciate Property).
ADS is mandatory for tangible property used predominantly outside the United States during the taxable year, for tax-exempt use property, for tax-exempt bond financed property, for imported property covered by an Executive order, and for property with a recovery period of 10 years or more held by an electing farming business, among the categories the subsection lists (26 U.S.C. 168(g)(1)).
One more required case is easy to trip over: any listed property, meaning vehicles and similar assets that lend themselves to personal use, used 50 percent or less in a qualified business use during the year (IRS, Publication 946, How To Depreciate Property). The election that drags a client’s real estate onto the same system is worked through in commercial real estate accounting.
ADS itself is plainer than GDS. It runs the straight line method without regard to salvage value, on the convention determined under subsection (d), over a recovery period that is the class life for most property, 12 years for personal property with no class life, 30 years for residential rental property, 40 years for nonresidential real property and 50 years for any railroad grading or tunnel bore or water utility property (26 U.S.C. 168(g)(2)).
One consequence is easy to miss when a client asks about a write-off. If ADS is required for the property, no special depreciation allowance can be claimed on it (IRS, Publication 946, How To Depreciate Property), which is one of the qualification tests set out in bonus depreciation.
Property Classes and Where the Class Life Comes From
Classification usually runs off one number, the class life, except where the statute names the property directly. Property with a class life of 4 or less is 3-year property, more than 4 but less than 10 is 5-year property, 10 or more but less than 16 is 7-year property, 16 or more but less than 20 is 10-year property, 20 or more but less than 25 is 15-year property, and 25 or more is 20-year property (26 U.S.C. 168(e)(1)).
That table yields to the property the statute classifies by description, so any automobile or light general purpose truck is 5-year property whatever its class life (26 U.S.C. 168(e)(3)(B)(i)). Table B-1 shows the same thing on its automobiles row, a class life of 3 against a GDS recovery period of 5 (IRS, Publication 946, How To Depreciate Property).
The class life is inherited rather than computed. Class life means the class life, if any, that would be applicable to the property as of January 1, 1986 under subsection (m) of section 167, determined as if the taxpayer had made an election under that subsection (26 U.S.C. 168(i)(1)). So a class life is looked up, never derived.
The lookup is a published table. Nine property classifications sit under GDS (IRS, Publication 946, How To Depreciate Property), and the 2025 form prints them in column (a) of Section B alongside a 50-year row added for that tax year (IRS, Instructions for Form 4562, 2025). The detail sits in Appendix B, the Table of Class Lives and Recovery Periods, where Table B-1 describes assets used in all business activities and Table B-2 describes assets used only in certain activities (IRS, Publication 946, How To Depreciate Property).
When neither table describes the asset the answer is still fixed. Property that does not have a class life and is not otherwise classified is 7-year property (26 U.S.C. 168(e)(3)(C)(v)), and the publication reaches the same place, generally 7 years for GDS or 12 years for ADS (IRS, Publication 946, How To Depreciate Property).
A Class Life Lookup, Start to Finish
Say a client capitalizes a desk for its office. In Table B-1, asset class 00.11, Office Furniture, Fixtures, and Equipment, carries a class life of 10 years, a GDS recovery period of 7 years and an ADS recovery period of 10 years (IRS, Publication 946, How To Depreciate Property).
The desk is not one of the assets the statute classifies by description, so everything else follows from that one lookup. A class life of 10 or more but less than 16 makes the desk 7-year property, its applicable recovery period is 7 years, its applicable method is the 200 percent declining balance method switching to straight line, and its applicable convention is the half-year one unless the mid-quarter rule takes the year (26 U.S.C. 168(b), (c), (d) and (e)).
On the return that becomes a single row. The desk goes on line 19c, the 7-year property row of Section B, with the month and year placed in service in column (b), the basis in column (c), the recovery period in column (d), HY in column (e) for the half-year convention and 200 DB in column (f) (IRS, Instructions for Form 4562, 2025). Had ADS applied, the same desk would run straight line over its 10-year class life and report on line 20a, the class life row of Section C (IRS, Form 4562, 2025).
What Section 168 Does Not Reach
Some property is outside the system by statute. It does not apply to property the taxpayer elects out of because it is properly depreciated under the unit-of-production method or another method not expressed in a term of years, or to public utility property where the taxpayer does not use a normalization method of accounting. It also does not reach motion picture film and video tape, sound recordings, or property placed in service in the churning transactions the subsection describes (26 U.S.C. 168(f)).
The publication adds the cases a preparer actually meets: property placed in service before 1987, certain property owned or used in 1986, intangible property, and certain corporate or partnership property acquired in a nontaxable transfer (IRS, Publication 946, How To Depreciate Property).
Excluded property still gets a line, just not this one. Depreciation on property subject to a section 168(f)(1) election is reported on line 15, and other depreciation, including ACRS, on line 16, both of them in Part II rather than in Part III (IRS, Instructions for Form 4562, 2025).
Where MACRS Lands in a Firm’s Work
MACRS has a whole part of one form to itself. Part III of Form 4562, Depreciation and Amortization, is headed MACRS Depreciation, and it splits three ways: Section A for the general asset account election and for assets placed in service in earlier years, Section B for the year’s assets under GDS, and Section C for the year’s assets under ADS (IRS, Form 4562, 2025).
The grouping election has a condition worth reading before a client is offered it. Each general asset account may include only assets placed in service in the same tax year that share the same depreciation method, recovery period and convention (IRS, Instructions for Form 4562, 2025). Every asset placed in service in an earlier year collapses onto a single line, line 17, so Sections B and C carry only the year’s additions (IRS, Form 4562, 2025). That earlier-years ground is covered in depreciated.
The book side of the same asset stays separate work, because the method, the period and both estimates are set for the return and not for the books. The rollforward and the contra account carrying the book charge are in fixed assets, and what happens to the recovered cost when the asset leaves is in depreciation recapture and disposition.
What MACRS Is Confused With
Book depreciation is the first confusion, and it is a category error rather than a close call. A depreciation policy in a client’s records estimates how an asset’s cost is consumed. MACRS hands out a deduction on a schedule the law wrote, and it is indifferent to whether the asset is wearing out that way.
ACRS is the second, and the name is the reason. The Accelerated Cost Recovery System applies to most depreciable tangible property placed in service after 1980 and before 1987, and property placed in service after 1986 uses MACRS instead (IRS, Publication 534, Depreciating Property Placed in Service Before 1987, Rev. November 2016). The Code section that carries the current system is still headed Accelerated cost recovery system (26 U.S.C. 168). The fuller name is the IRS’s, and all the word modified marks is the version that took over for property placed in service after 1986.
Bonus depreciation and the section 179 expense election are the third, and they sit on top of MACRS rather than replacing it. The section 179 election is made in Part I of the form and the special depreciation allowance is claimed on line 14 in Part II, and whatever basis is left after both of them runs through Part III under this system (IRS, Form 4562, 2025). The qualification tests for the allowance are in bonus depreciation.
What Is the MACRS Method of Depreciation?
There is no MACRS method. MACRS is the system that assigns one, and which method an asset gets is a function of its property class rather than of anything the client elected (26 U.S.C. 168(b)).
What Is the MACRS Formula?
There is no single formula either, which is why the published percentage tables exist. The deduction for a year is the depreciable basis multiplied by a rate, and the rate is whatever the assigned method, recovery period and convention produce for that year of that class (IRS, Publication 946, How To Depreciate Property). That rate is derived in accelerated depreciation and in straight line depreciation.
If fixed-asset schedules and depreciation rollforwards are the client work that slides to the last week of every close, a trial task puts a block of it through Accountably’s review chain before your own reviewer depends on it.
