Can a Sole Proprietor Use Section 179? Limits, Vehicles, Filing

Yes, a sole proprietor can claim the Section 179 deduction, and it’s one of the most valuable write-offs available to you. Section 179 lets you deduct the full cost of qualifying business equipment, software, and certain vehicles in the year you place them in service, instead of depreciating that cost over several years. For tax years beginning in 2026, you can expense up to $2,560,000 of qualifying purchases, with the deduction beginning to phase out once your total qualifying purchases exceed $4,090,000.¹

Do You Qualify as a Sole Proprietor

You qualify if you operate an active trade or business, meaning you’re regularly, continuously, and substantially involved in running it for profit. Passive investments and hobbies don’t count.²

Because a sole proprietorship isn’t a separate legal entity, your business income and expenses land directly on your personal return through Schedule C, and that’s where the Section 179 deduction ultimately shows up. The mechanics are simpler than for partners or S corporation shareholders, who receive their share of the deduction through a Schedule K-1. You calculate and claim the entire deduction yourself on one form.

What Property Qualifies

Section 179 property has to be tangible personal property used in the active conduct of your business. That covers machinery, manufacturing equipment, office furniture, tools, and computers. Off-the-shelf software available to the general public under a non-exclusive license also qualifies.²

Certain improvements to nonresidential real property count too, including roofs, HVAC systems, fire protection and alarm systems, and security systems. That’s a meaningful expansion, because those improvements would otherwise depreciate over 39 years.²

A few requirements catch people out. The property has to be purchased, not leased from someone else. Used equipment qualifies as long as it’s new to you and you don’t buy it from a related party, which the statute defines narrowly here: your spouse, ancestors, and lineal descendants. Purchases from a controlled business group you’re part of are excluded as well.² Property acquired through gift or inheritance doesn’t qualify. And the asset has to be placed in service during the tax year you’re claiming the deduction, meaning it’s actually set up and ready for use.

Dollar Limits and the Income Cap for 2026

For tax years beginning in 2026, the maximum Section 179 deduction is $2,560,000. That full amount stays available until your total qualifying purchases for the year exceed $4,090,000, at which point the deduction shrinks dollar-for-dollar. Spend $6,650,000 or more on qualifying property and the Section 179 deduction disappears entirely.¹

For most sole proprietors, the dollar cap isn’t the real ceiling. The income limit is. Your Section 179 deduction for the year cannot exceed the total taxable income from all your active business activities. Earn $80,000 in net business income and your deduction tops out at $80,000, no matter how much equipment you bought. Any excess carries forward indefinitely until you have enough business income to absorb it.³

Two things soften that income limit. Wages and other compensation you earn as an employee count toward taxable income for this test, and if you file jointly, your spouse’s active business income counts too.⁴

Vehicle Rules

Vehicles are where Section 179 gets complicated, and where the most money is at stake for a lot of sole proprietors. The rules split vehicles into categories based on gross vehicle weight rating (GVWR), and the limits vary dramatically. Any vehicle you expense has to be used more than 50% for business, and your deduction is proportional to that business-use percentage.

Passenger Cars at 6,000 lbs or Less

For standard passenger vehicles rated 6,000 pounds GVWR or less, the Section 179 deduction is capped by annual depreciation limits that apply regardless of what you paid. In 2026, the first-year limit is $20,300 if bonus depreciation applies, or $12,300 without it.⁵ Buy a $55,000 sedan and use it 100% for business, and your first-year write-off still stops at $20,300. The rest gets depreciated over the following years, subject to annual limits.

Heavy SUVs Over 6,000 lbs

SUVs and crossovers rated above 6,000 lbs GVWR but below 14,000 lbs sit in a special category. The Section 179 deduction for these is capped at $32,000 for 2026.¹ You can depreciate the rest of the cost through other means, including bonus depreciation, but the Section 179 portion itself cannot exceed $32,000.

Heavy Trucks, Vans, and Long-Bed Pickups

Work trucks, cargo vans, and other vehicles over 6,000 lbs GVWR that aren’t classified as SUVs can qualify for the full Section 179 deduction with no special vehicle cap. Pickup trucks with a bed length of at least six feet also escape the SUV limitation. For a sole proprietor buying a heavy work vehicle, this classification is the difference between a $32,000 write-off and a six-figure one.

Business-Use Test and Recapture

Every asset you expense under Section 179 has to be used more than 50% for business in the year you place it in service. If business use is less than 100%, your deduction is proportional.⁶

The trap comes later. If business use drops to 50% or below in any year during the asset’s recovery period, you owe recapture. The IRS calculates the difference between the Section 179 deduction you originally took and the depreciation you would have been allowed under the slower Alternative Depreciation System from the year the property was placed in service through the recapture year. That difference becomes ordinary income you report on Form 4797.⁷

The math can produce a surprisingly large tax bill. Expense a $50,000 piece of equipment in year one, then in year three start using it primarily for personal purposes: ADS might have allowed roughly $15,000 in total depreciation over those three years, so you’d owe tax on $35,000 of recaptured income. Don’t expense an asset under Section 179 unless you’re confident it will stay in business service.

Vehicles and a few other items the IRS calls “listed property” carry heavier documentation obligations because they lend themselves to personal use. For vehicles, that means a contemporaneous mileage log capturing the date, business purpose, and mileage for each trip. Keep those records through the end of the asset’s recovery period, which for a five-year asset means at least six years.⁸

Section 179 or Bonus Depreciation

The One Big Beautiful Bill Act permanently restored 100% bonus depreciation for property acquired after January 19, 2025, so you now have two ways to write off the full cost of business assets immediately.⁹ They overlap heavily but differ in ways that matter for planning:

Section 179 cannot create a business loss on your return. Bonus depreciation can, which lets you generate a net operating loss to offset other income or carry forward.
Section 179 is an election you make. Bonus depreciation applies automatically to eligible property unless you elect out.
Bonus depreciation has no income cap. Section 179 is limited to your active business income.
Excess Section 179 amounts carry forward. Bonus depreciation follows net operating loss rules instead.

Many sole proprietors use Section 179 first up to their business income, then let bonus depreciation handle any remaining cost. That gives you the maximum current-year deduction while preserving the Section 179 carryforward for future years if you need it.

Self-Employment Tax Savings

A benefit sole proprietors sometimes overlook: Section 179 reduces not just income tax but also self-employment tax. The SE rate is 15.3% on net earnings (12.4% for Social Security up to the annual wage base, plus 2.9% for Medicare with no cap). Because the deduction lowers your net business income on Schedule C, every dollar you expense escapes that 15.3% too. On a $50,000 deduction, the SE tax savings alone can run around $7,000.

There’s a long-term trade-off. Lower reported self-employment earnings mean fewer Social Security credits and a smaller eventual benefit. If you’re in peak earning years and plan to rely heavily on Social Security, weigh that against the immediate savings. For most people buying significant equipment, the upfront savings win, but it isn’t free.

How to Claim It

You make the Section 179 election on Part I of IRS Form 4562 (Depreciation and Amortization). For each asset, enter a description and the cost attributable to business use. The form walks you through applying the dollar limit, the phase-out reduction, and the income limit to arrive at your allowable deduction on Line 12.⁴

Before filling it out, gather the exact date each asset was placed in service, its total cost including shipping and installation, and your calculated business-use percentage. The allowable deduction flows from Form 4562 to Schedule C, which attaches to your Form 1040.

State Tax Conformity

Your federal Section 179 deduction doesn’t automatically carry over to your state return. More than a dozen states set their own Section 179 limits substantially lower than the federal amount. Several cap the deduction at $25,000, and others allow figures ranging roughly $120,000 to $250,000. If you operate in one of those states, you may owe state tax on income you’ve already written off federally. Check your state’s conformity rules before you assume the full federal deduction flows through.

1
Internal Revenue Service. Rev. Proc. 2025-32
2
Office of the Law Revision Counsel. 26 USC 179 Election To Expense Certain Depreciable Business Assets
3
eCFR. 26 CFR 1.179-3 Carryover of Disallowed Deduction
4
Internal Revenue Service. 2025 Instructions for Form 4562
5
Internal Revenue Service. Rev. Proc. 2026-15
6
CCH AnswerConnect. Section 179 Deduction
7
Internal Revenue Service. 2025 Instructions for Form 4797
8
Internal Revenue Service. Publication 946 (2025) How To Depreciate Property
9
Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill