Section 179 Qualifying Property: Rules, Limits, and Vehicles

Property that qualifies for the Section 179 deduction falls into four main groups: tangible personal property used in a trade or business, off-the-shelf computer software, qualifying business vehicles, and certain improvements to nonresidential buildings. For 2026, you can expense up to $2,560,000 of qualifying purchases in the year the property is placed in service, with the benefit phasing out dollar-for-dollar once total qualifying purchases exceed $4,090,000.¹ The property has to be used more than half the time for business, and several categories are excluded no matter how business-related they seem.

Tangible Personal Property

This is the core category and covers most of what a business buys to run its operations: manufacturing machinery, office furniture, tools, computers, printers, shop equipment, and specialized production gear. Both new and used items qualify, provided the asset is new to your business and acquired by purchase rather than through a gift, inheritance, or a transaction with a related party.²

The asset must be placed in service during the tax year you claim the deduction. “Placed in service” means installed and ready for its intended function, even if you haven’t yet used it. For calendar-year filers, that deadline is December 31. Delivery receipts, installation records, and dated vendor invoices are worth keeping, because timing is one of the first things the IRS looks at if a return gets questioned.

Business Vehicles

Vehicles qualify, but the treatment depends almost entirely on the manufacturer’s gross vehicle weight rating.

Heavy SUVs, Trucks, and Vans

Trucks, vans, and SUVs with a GVWR above 6,000 pounds but no more than 14,000 pounds are eligible, subject to a separate SUV cap. For 2026, the Section 179 deduction on these vehicles is limited to $32,000 regardless of the vehicle’s actual cost.¹ Vehicles with a GVWR above 14,000 pounds, such as full-size work trucks and heavy commercial vehicles, are not subject to the SUV-specific cap and can be expensed up to the full Section 179 limit.

Passenger Cars and Light Trucks

Passenger automobiles under 6,000 pounds fall under the much tighter Section 280F limits. For vehicles placed in service in 2026, the maximum first-year depreciation, including any Section 179 amount, is $12,300. If the vehicle also qualifies for additional first-year bonus depreciation, that cap rises to $20,300.³ Because these caps cover Section 179 and regular depreciation combined, electing Section 179 on a passenger car rarely changes the first-year result much.

Off-the-Shelf Computer Software

Software qualifies if it is readily available to the general public, sold under a nonexclusive license, and not substantially modified for the buyer.¹ Standard business applications, accounting packages, design tools, and operating systems generally fit. Custom-developed software and heavily customized enterprise platforms usually don’t, because those costs are typically amortized on a different schedule rather than expensed immediately.

Nonresidential Building Improvements

At the taxpayer’s election, certain improvements to nonresidential real property qualify. The category, often called qualified improvement property, covers interior improvements to an existing commercial building made after the building was originally placed in service.² The statute also specifically includes roofs, HVAC systems, fire protection and alarm systems, and security systems installed on nonresidential buildings, even though those improvements can be exterior or structural.⁴

Three types of building work are excluded, no matter how useful:

Enlargements that add square footage to the structure.
Elevators and escalators, including installations and replacements.
Modifications to the internal structural framework, meaning load-bearing walls, columns, floors, and ceilings.

The exclusions are strict in practice. A full gut renovation that reworks interior walls can cross into structural framework territory, and those costs would then fall outside Section 179 even though the finished space looks brand new.²

Property That Does Not Qualify

Some categories are ineligible outright, even when they clearly serve the business:

Land and land improvements, including parking lots, fences, swimming pools, docks, and bridges.
Property used predominantly outside the United States.
Property acquired from a related party, such as a spouse, a controlled corporation, or certain family members.
Property received by gift or inheritance. The asset has to be acquired by purchase.
Investment or rental property held to generate passive income rather than used in an active trade or business.
Property used by tax-exempt organizations or government entities, with narrow exceptions.

Estates and trusts cannot make the Section 179 election at all.²

The More-Than-50% Business Use Rule

Every asset you expense under Section 179 has to be used for business more than 50% of the time. A laptop used 70% for business and 30% for personal tasks qualifies at 70% of its cost. Fall to 50% or below and the asset loses eligibility entirely.²

The 50% test doesn’t stop after the first year. If business use drops to 50% or below in any later year of the asset’s recovery period, the IRS requires recapture: you report the previously deducted amount as income, which can produce a tax bill well after the purchase. Recapture is reported on Form 4797.⁵

Vehicles and computers are treated as listed property, which brings stricter recordkeeping. You need contemporaneous records showing the date, business purpose, and amount of each use. For vehicles that means a mileage log; for computers, a time-based usage log. The IRS accepts a representative-sample approach where a detailed log for part of the year, shown to reflect full-year usage, can stand in for a full log.² A contemporaneous daily log is always safer than reconstruction after the fact.

Dollar Limits, Phase-Out, and the Income Cap

The statute sets a base deduction cap of $2,500,000 and a phase-out threshold of $4,000,000, both indexed for inflation starting with tax years beginning after 2025.¹ After the 2026 adjustment, the deduction cap is $2,560,000 and the phase-out begins at $4,090,000.

The phase-out is dollar-for-dollar. Every dollar of qualifying property placed in service above $4,090,000 reduces the available deduction by a dollar. A business placing $6,650,000 or more of qualifying property in service during 2026 loses the Section 179 deduction entirely, though bonus depreciation may still apply.

A second limit trips up many owners. The deduction cannot exceed your total taxable income from the active conduct of a trade or business for the year.⁶ Section 179 cannot create or increase a net operating loss. If the business earns $200,000 and you elect to expense $300,000 of qualifying property, the deduction is capped at $200,000 that year. The remaining $100,000 carries forward indefinitely and can be used in a future year when there is enough business income to absorb it.⁷

Section 179 Compared to Bonus Depreciation

Bonus depreciation and Section 179 both allow first-year expensing but work differently. Following passage of the One, Big, Beautiful Bill Act in 2025, 100% bonus depreciation has been restored and made permanent, so the choice between them matters again for many buyers.

The practical difference that matters most: Section 179 cannot push business income below zero, while bonus depreciation can create or increase a net operating loss. A business with $500,000 of income and $800,000 of equipment purchases could take only $500,000 under Section 179 but the full $800,000 under bonus depreciation, carrying the resulting loss forward. The IRS requires most businesses to apply Section 179 first, then bonus depreciation to any remaining basis. Bonus depreciation also has no investment ceiling, while Section 179 phases out completely once qualifying purchases reach $6,650,000.

How to Claim It

The Section 179 deduction goes on Part I of IRS Form 4562. Each asset is listed individually with a description, the date placed in service, and its cost. Keep invoices and purchase receipts that tie back to the figures on the form. Form 4562 is attached to the business return: sole proprietors file it with Form 1040, and corporations include it with Form 1120.⁵

One boundary worth flagging: some states do not conform to the federal Section 179 limits. California, for example, caps the state deduction at $25,000 with a much lower phase-out threshold. If your state has decoupled from the federal rules, you can owe state tax on income you’ve already written off federally. Check your state’s conformity rules before assuming the federal deduction carries through.

1
Office of the Law Revision Counsel. 26 USC 179 – Election to Expense Certain Depreciable Business Assets
2
Internal Revenue Service. Publication 946 – How To Depreciate Property
3
Internal Revenue Service. Rev. Proc. 2026-15
4
Internal Revenue Service. Depreciation Expense Helps Business Owners Keep More Money
5
Internal Revenue Service. Instructions for Form 4562 (2025)
6
eCFR. 26 CFR 1.179-2 – Limitations on Amount Subject to Section 179 Election
7
eCFR. 26 CFR 1.179-3 – Carryover of Disallowed Deduction