Depreciable Life of a Trailer: MACRS, Section 179, and Recapture

The depreciable life of a trailer used in a business is generally five years under the Modified Accelerated Cost Recovery System (MACRS). The IRS assigns trailers and trailer-mounted containers to Asset Class 00.27 in Revenue Procedure 87-56, giving them a five-year recovery period under the General Depreciation System and a six-year period under the Alternative Depreciation System.¹ In practice, most buyers never spread the deduction over five years at all, because Section 179 and 100% bonus depreciation usually let you write off the full cost in the year the trailer is placed in service.

The Five-Year MACRS Class

Asset Class 00.27 covers dry vans, flatbeds, reefers, and most other over-the-road hauling equipment. What matters for classification is how you use the trailer in your business, not how it is built. A box trailer hauling freight and the same box trailer parked as a job-site office can land in different property classes.

Under the General Depreciation System (GDS), which is the default, five-year property uses the 200% declining balance method and switches to straight-line partway through whenever that produces a larger deduction.² The half-year convention treats the trailer as placed in service at the midpoint of year one, so you get half a year of depreciation in the first year and a final sliver in a sixth calendar year. The recovery period is five years, but the deductions touch six tax returns.

One trap: if more than 40% of your total depreciable property for the year goes into service in the last quarter, the mid-quarter convention replaces the half-year convention and shrinks that first-year deduction further. MACRS also assumes a salvage value of zero, so you depreciate the entire cost basis without subtracting an estimated resale value.

When the Recovery Period Is Different

The five-year figure is the common case, not a universal rule. A few situations pull a trailer into a different class.

New vs. Used Farm Trailers

Agricultural equipment splits on age. New farm machinery and equipment placed in service after 2017 gets a five-year GDS recovery period, while used farm equipment stays at seven years.³ A brand-new grain trailer depreciates over five years; a secondhand one from an auction depreciates over seven.

Trailers Used as Buildings or Homes

When a trailer stops moving, classification gets complicated. A construction trailer parked on a job site, hooked to utilities, and used as a stationary office or storage unit can be treated as something other than transportation equipment and reclassified into a longer recovery period. The primary function during the tax year is what governs.

The larger jump involves rental housing. If 80% or more of a structure’s gross rental income comes from dwelling units, the IRS classifies it as residential rental property with a 27.5-year recovery period.² A mobile home rented to a tenant as their residence meets this definition whether or not it still has wheels. Five years to 27.5 years is a big enough swing to settle before filing.

Industry-Specific Classes

Revenue Procedure 87-56 contains dozens of industry-specific asset classes. A logging trailer used by a sawmill operator, for example, would generally follow the classification for logging equipment rather than the general transportation class. Checking the tables against how the trailer actually functions in your business is worth the time.

When ADS Is Required

The Alternative Depreciation System stretches the recovery period to six years and requires straight-line depreciation. It is mandatory in several situations:⁴

The trailer is used predominantly outside the United States.
The trailer is leased to a tax-exempt organization.
You financed the purchase with tax-exempt bond proceeds.
The trailer is listed property used 50% or less for business.
You elected out of the uniform capitalization rules for farm property.

You can also elect ADS voluntarily, which some businesses do when they expect higher brackets later or want steadier deductions. The election is irrevocable and applies to all property in that class placed in service that year.

Writing Off the Full Cost in Year One

Two provisions usually make the five-year schedule academic.

Section 179

Section 179 lets you deduct the full purchase price of qualifying business property in the year it goes into service, up to an annual cap. The base limit is $2,500,000 and adjusts for inflation.⁵ For 2026, the inflation-adjusted limit is approximately $2,560,000. The deduction phases out dollar-for-dollar once total equipment purchases for the year exceed $4,000,000 (also inflation-adjusted).

The trailer must be used for business more than 50% of the time. The Section 179 deduction cannot create or increase a net operating loss; it is capped at your taxable income from active trades or businesses, and any unused amount carries forward.

Bonus Depreciation

The One, Big, Beautiful Bill Act, signed in 2025, restored permanent 100% bonus depreciation for qualified property acquired after January 19, 2025.⁶ For a trailer placed in service in 2026, that means writing off 100% in year one. Bonus depreciation has no dollar cap and can create or increase a net operating loss.

Both new and used trailers qualify, but used property has to meet specific requirements: the trailer cannot be one you previously used, it cannot come from a related party, and your cost basis cannot be determined by the seller’s basis.⁷ An arm’s-length purchase from an unrelated seller is the typical qualifying case.

Using Them Together

You can apply Section 179 first and then claim bonus depreciation on any remaining basis. With bonus back at 100%, most businesses simply take bonus on the full cost. Section 179 stays useful when you want to shape the size of a net operating loss or preserve deductions to carry forward. Either way, you report both on Form 4562, which must be filed any time you claim depreciation on newly placed-in-service property or take a Section 179 deduction.⁴

Business Use and Listed Property Rules

Transportation property counts as listed property unless it qualifies as a nonpersonal use vehicle, meaning it has been modified so personal use is inherently unlikely.² A heavy commercial flatbed usually clears that bar. A small enclosed trailer you also use to haul personal items on weekends probably does not.

If the trailer is listed property, you have to track usage and document the business purpose of each trip, including date and mileage. Without adequate records, you lose the right to claim depreciation or Section 179 at all.²

The 50% business-use threshold matters beyond Section 179 eligibility. If business use drops to 50% or below in any year, you lose accelerated depreciation entirely. The IRS forces a switch to straight-line over the longer ADS period, and you may have to recapture excess depreciation from earlier high-use years, adding it back to income in the year use drops.⁴ A simple mileage log from day one prevents the problem.

Depreciation Recapture When You Sell

Depreciation gives you deductions during ownership, and the IRS takes some of it back at sale. Under Section 1245, gain on the sale of depreciable personal property is taxed as ordinary income to the extent of the depreciation previously claimed.⁸ This applies whether the trailer was depreciated under regular MACRS or fully expensed through Section 179 or bonus depreciation.

Here is where accelerated depreciation has a cost. If you bought a trailer for $50,000, expensed the entire amount in year one, and sold it three years later for $20,000, the full $20,000 is ordinary income, because it falls entirely within the depreciation already deducted. Recapture cannot exceed total depreciation taken. Gain above your original purchase price would be capital gain. Recaptured depreciation is taxed at ordinary rates but is not subject to self-employment tax.

Selling a fully depreciated trailer for any amount above zero triggers recapture. That surprises owners who deducted the full cost early and sold years later without setting aside money for the tax. Factoring recapture into the decision at the time you take the deduction avoids it.

State Conformity

Federal depreciation rules and state rules do not always match. Many states conform to the federal system, but a significant number decouple from provisions like bonus depreciation. In a decoupled state, you may end up deducting 100% federally in year one while spreading the trailer over the full recovery period on the state return. That creates temporary differences between federal and state taxable income that have to be tracked. Check your state’s current conformity rules before assuming the federal write-off carries over, especially since those decisions can shift from year to year.

1
Internal Revenue Service. Rev. Proc. 87-56 – ACRS Depreciation
2
Internal Revenue Service. Publication 946 (2025), How To Depreciate Property
3
Internal Revenue Service. Publication 225 (2025), Farmer’s Tax Guide
4
Internal Revenue Service. Instructions for Form 4562
5
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
6
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
7
Internal Revenue Service. Additional First Year Depreciation Deduction (Bonus) – FAQ
8
Office of the Law Revision Counsel. 26 US Code 1245 – Gain From Dispositions of Certain Depreciable Property