What Qualifies for Accelerated Depreciation: Section 179 and MACRS

Most tangible business assets with a useful life longer than one year qualify for accelerated depreciation, but the specific method available, and how much you can write off in year one, depends on the asset class, the total dollars you place in service, and how heavily you use the property for business. For 2026, the two most powerful tools are Section 179 expensing up to $2,560,000 and 100% bonus depreciation, which the One, Big, Beautiful Bill restored permanently for property acquired after January 19, 2025. Passenger vehicles carry their own dollar caps, real estate improvements get favorable 15-year treatment when they fit the definition, and some assets lose accelerated treatment entirely if business use falls to 50% or below.

The Four Baseline Requirements

Before any accelerated method applies, an asset has to clear four tests. You must own the property, use it in a trade or business or to produce income, and it must have a useful life extending beyond one year. The asset also needs a determinable useful life, meaning it wears out, becomes obsolete, or loses value through use.¹

Land fails this test. It doesn’t wear out, so you can never depreciate it. Fine art and certain collectibles that hold or gain value indefinitely also fail. And property bought and disposed of in the same tax year gets no depreciation at all.

Three data points drive every calculation that follows: when the property was placed in service, what it cost, and what percentage of use is for business. Document all three from day one.

Section 179 Immediate Expensing

Section 179 lets you deduct the full purchase price of qualifying property in the year you place it in service rather than spreading the deduction over several years. For tax years beginning in 2026, the maximum Section 179 deduction is $2,560,000.²

That limit phases out dollar-for-dollar once total qualifying property placed in service during the year exceeds $4,090,000, and it disappears completely at $6,650,000.² If your equipment spending stays below $4,090,000, the phase-out doesn’t touch you.

Most tangible personal property used in business qualifies: machinery, office furniture, computers, manufacturing equipment, off-the-shelf software, and qualified improvement property. The deduction cannot exceed your taxable income from active business operations for the year, though excess amounts carry forward.

Bonus Depreciation Under the One, Big, Beautiful Bill

Bonus depreciation had been fading. Under the original Tax Cuts and Jobs Act schedule, the 100% first-year allowance dropped by 20 percentage points each year after 2022 and was heading for 20% in 2026 before expiring in 2027.³ The One, Big, Beautiful Bill changed that.

The OBBB restored a permanent 100% additional first-year depreciation deduction for qualified property acquired after January 19, 2025.⁴ There is no sunset date. For any qualifying asset placed in service in 2026 or later, the full cost is deductible in year one.

To qualify, the asset must be tangible property depreciated under MACRS with a recovery period of 20 years or less, qualified improvement property, certain computer software, water utility property, or qualified film, television, and live theatrical productions.¹ Unlike Section 179, bonus depreciation has no dollar cap and no phase-out based on total spending. A company placing $10 million of qualifying equipment into service can deduct the full amount.

Used Property Qualifies

Used property qualifies alongside new equipment. It just has to be new to you. Five requirements apply: you or a predecessor never used the property before the acquisition, you didn’t buy it from a related party, your basis isn’t determined by the seller’s basis, the property wasn’t inherited, and the cost doesn’t include the basis of other property you already held.⁵ Buying a used CNC machine from an unrelated seller at fair market value clears all five tests. Receiving the same machine from a related family business does not.

Using Section 179 and Bonus Depreciation Together

These provisions aren’t mutually exclusive. Many businesses apply Section 179 to their first $2,560,000 of qualifying assets and then claim bonus depreciation on everything above that. Section 179 is a targeted tool: you choose which specific assets to expense, controlling how much income you offset. Bonus depreciation applies automatically to all qualifying property unless you elect out.

MACRS Classes for Everything Else

When neither Section 179 nor bonus depreciation covers the full cost, the Modified Accelerated Cost Recovery System determines how quickly you recover the rest. MACRS assigns every depreciable asset to a property class that sets both the recovery period and the method. Most business personal property uses 200% declining balance, which front-loads deductions and switches to straight-line when that produces a larger deduction.

The common classes for business equipment:

3-year property: tractor units for over-the-road use and certain specialized tools.
5-year property: automobiles, trucks, computers, and office machinery like copiers.
7-year property: office furniture, fixtures, desks, and safes.
15-year property: land improvements such as fences, roads, sidewalks, and shrubbery, plus qualified improvement property.

The 15-year class uses 150% declining balance rather than 200%, still faster than straight-line but less aggressive than shorter-lived property.⁶ Nonresidential real property and residential rental property fall into 39-year and 27.5-year classes respectively, using straight-line depreciation. These long-lived categories don’t qualify for bonus depreciation on their own, which is why cost segregation studies that break building components into shorter-lived classes matter.

The Mid-Quarter Trap

Timing matters. If more than 40% of your total depreciable MACRS property for the year is placed in service during the last three months, the IRS forces you to use the mid-quarter convention instead of the standard half-year convention.¹ Under that convention, fourth-quarter assets are treated as placed in service at the midpoint of the quarter, reducing your first-year deduction. Businesses that load up on December equipment purchases get caught. One way out: claim bonus depreciation or Section 179 on those late-year purchases, since property fully expensed under those methods generally doesn’t count toward the 40% calculation.

Qualified Improvement Property and Land Improvements

Qualified improvement property is any improvement made to the interior of an existing nonresidential building after the building was first placed in service.⁷ Upgraded lighting, new flooring, reconfigured office layouts, modernized plumbing in commercial space. Because QIP carries a 15-year recovery period, it qualifies for 100% bonus depreciation instead of being depreciated over the building’s 39-year life.

Three types of work are explicitly excluded: expanding the building’s footprint, installing or replacing elevators and escalators, and changes to the building’s internal structural framework.⁷ Replacing load-bearing walls is structural. Putting up partition walls to create offices is an interior improvement. Getting the classification wrong means depreciating over 39 years when the cost could have been deducted immediately.

Land improvements like parking lots, fences, sidewalks, and landscaping also fall into the 15-year class and qualify for accelerated treatment, including bonus depreciation.¹ The land itself never depreciates; the paving on top of it does. Owners who lump everything under “building” routinely miss these shorter recovery periods.

Off-the-Shelf Software

Software purchased off the shelf qualifies for accelerated depreciation if it’s available to the general public under a non-exclusive license and hasn’t been substantially customized. Standard accounting programs, operating systems, and productivity suites all qualify. The baseline schedule is 36 months using the straight-line method.⁸ Most businesses skip the three-year schedule by claiming Section 179 or bonus depreciation instead. Custom-developed software follows different rules, so the off-the-shelf distinction matters.

Vehicles and the Luxury Auto Caps

Passenger automobiles qualify for accelerated depreciation, but Congress imposes annual dollar caps that override the normal rules. For vehicles placed in service in 2026, the limits are:

With bonus depreciation: $20,300 in year one, $19,800 in year two, $11,900 in year three, and $7,160 for each year after.
Without bonus depreciation: $12,300 in year one, $19,800 in year two, $11,900 in year three, and $7,160 for each year after.

⁹

You cannot simply expense a $55,000 sedan in year one, even though Section 179 and bonus depreciation would otherwise allow it. Recovery stretches across six or more years regardless of which method you choose.

The 6,000-Pound Exception

Trucks, vans, and SUVs with a gross vehicle weight rating above 6,000 pounds escape the passenger automobile caps. Heavy-duty pickups and work vans crossing that threshold can be fully expensed under Section 179 and bonus depreciation, subject to the overall Section 179 limits. SUVs in the 6,001 to 14,000-pound range face a separate Section 179 cap of $32,000 for 2026, but any remaining cost qualifies for bonus depreciation with no additional dollar limit.² A qualifying heavy SUV costing $75,000 can see the vast majority of its cost deducted in year one.

The 50% Business-Use Threshold

The most aggressive methods require that you use the asset more than 50% for business. If business use is 50% or less, you lose Section 179, bonus depreciation, and the 200% declining balance method. You’re limited to straight-line depreciation under the Alternative Depreciation System.¹⁰

This rule applies to “listed property”: passenger automobiles, other vehicles used for transportation, and property typically used for entertainment or recreation.¹¹ Computers and cell phones used to be on this list but were removed. Vehicles remain the listed property most businesses need to track.

Falling below 50% has consequences beyond future deductions. If you claimed accelerated depreciation in earlier years and business use later drops to 50% or below, you owe recapture. The recapture amount is the difference between the accelerated depreciation actually claimed and what you would have claimed under straight-line from the start. That difference gets added to your income as ordinary taxable income in the year business use dropped.¹⁰ Mileage logs and usage records aren’t optional. Without contemporaneous documentation, the IRS will disallow the business use percentage entirely.

Recapture When You Sell

Accelerated depreciation creates larger deductions up front, but those deductions reduce your basis. When you sell, the lower basis means more taxable gain, and the IRS doesn’t tax it all at capital gains rates. For most business equipment, all depreciation claimed gets recaptured as ordinary income up to the amount of your gain.¹²

Under Section 1245, a truck bought for $50,000 with $35,000 in depreciation claimed has an adjusted basis of $15,000. Sell it for $30,000 and the entire $15,000 gain is ordinary income because it falls within the $35,000 of depreciation taken.¹³ You keep the time value from the earlier deductions, but you don’t escape the tax permanently.

Real property improvements follow a different path. Depreciation on buildings and qualified improvement property is recaptured under Section 1250 at a maximum rate of 25% on the unrecaptured gain rather than at full ordinary income rates.¹⁴ The 25% rate is still higher than the long-term capital gains rate most taxpayers pay.

How to Elect: Form 4562 and Deadlines

All depreciation and expensing elections flow through IRS Form 4562, filed with your income tax return. The Section 179 election is made on this form and must be filed with either the original return for the year the property was placed in service or an amended return filed within the time allowed by law.¹⁵ Miss the window, lose the deduction for that year.

Bonus depreciation applies automatically unless you affirmatively elect out. To opt out for a class of property, attach the election to a timely filed return, including extensions. If you filed on time without the election, you have six months from the original due date, not counting extensions, to file an amended return with it.¹⁵ Electing out can make sense in low-income years when preserving the deduction for later has more value than the immediate write-off.

State returns add complexity. Many states decouple from federal bonus depreciation or impose their own Section 179 limits. An asset fully expensed on your federal return may need to be depreciated over its normal recovery period on your state return. Check your state’s conformity rules before assuming the federal deduction carries through everywhere.

1
Internal Revenue Service. Publication 946, How To Depreciate Property
2
Internal Revenue Service. Revenue Procedure 2025-32 – Inflation Adjusted Items for 2026
3
Internal Revenue Service. Tax Cuts and Jobs Act – A Comparison for Businesses
4
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One, Big, Beautiful Bill
5
Internal Revenue Service. Additional First Year Depreciation Deduction (Bonus) – FAQ
6
Internal Revenue Service. Publication 527 (2025), Residential Rental Property
7
Legal Information Institute. Definition – Qualified Improvement Property From 26 USC 168(e)(6)
8
Legal Information Institute. Definition – Computer Software From 26 USC 167(f)(1)
9
Internal Revenue Service. Revenue Procedure 2026-15 – Automobile Depreciation Limits
10
Internal Revenue Service. Publication 587 (2025), Business Use of Your Home – Section: Listed Property
11
Office of the Law Revision Counsel. 26 USC 280F – Limitation on Depreciation for Luxury Automobiles
12
Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets
13
Office of the Law Revision Counsel. 26 USC 1245 – Gain From Dispositions of Certain Depreciable Property
14
Internal Revenue Service. Topic No. 409, Capital Gains and Losses
15
Internal Revenue Service. 2025 Instructions for Form 4562 – Depreciation and Amortization