Section 179 is a United States federal income-tax deduction for qualifying business property. This guide explains US rules for tax years beginning in 2026; translating it into Italian does not make it an Italian tax deduction. All dollar amounts are US dollars.
A qualifying business might deduct a $50,000 machine in the year it is ready and available for business use, subject to the limits below. That reduces taxable income by $50,000, not the tax bill by $50,000. Buying or paying for equipment alone does not establish the deduction.
IRS sources checked September 10, 2026: Revenue Procedure 2025-32, section 3.24 supplies the 2026 inflation-adjusted limits. Publication 946 and the Form 4562 instructions explain eligibility, elections, income limits, and recapture. Their currently available editions cover 2025, with Publication 946 also identifying the 2026 limits; use the return and instructions for the year you actually file.
What Section 179 Actually Does
Normally, when a business buys a long-lived asset like a forklift, office furniture, or a commercial oven, the IRS treats it as a capital expense. Rather than deducting the full cost right away, you spread that deduction across the asset's "useful life" through annual depreciation.
Section 179 is an exception to that rule. It allows eligible businesses to elect to deduct the full cost of qualifying property in the year it's placed in service, up to an annual dollar limit. The deduction is claimed on Form 4562, Part I, and flows through to your business tax return.
The core benefit is simple: faster deductions mean lower taxes this year, which means more cash on hand to reinvest, pay down debt, or smooth out uneven revenue.
2026 Limits: What You Can Deduct
For tax years beginning in 2026, Revenue Procedure 2025-32 sets these limits:
- Maximum deduction: $2,560,000
- Phase-out threshold: $4,090,000 (total qualifying property placed in service)
- Full phase-out point: $6,650,000
- SUV cap (over 6,000 through 14,000 lb GVWR, subject to vehicle exceptions): $32,000
Here's how the phase-out works. Once your total qualifying purchases exceed $4,090,000 in a year, your maximum deduction drops dollar for dollar. Spend $4,590,000 on qualifying property and your Section 179 cap drops by $500,000 to $2,060,000. Spend $6,650,000 or more, and the deduction zeroes out entirely. This is why Section 179 is built for small and mid-sized businesses, not enterprises making massive capital outlays.
One more ceiling: the deduction is limited by taxable income from the active conduct of trades or businesses, calculated under the Section 179 rules. For an individual, this can include wages from employment and income or losses from other actively conducted businesses; it is not simply the profit of the business buying the asset. The calculation excludes the Section 179 deduction itself and specified other deductions. Partnerships and S corporations also apply limits at the entity and owner levels.
For example, assume the applicable business-income limit is $200,000 after these adjustments, you elect to expense $300,000 of qualifying equipment, and all other limits are satisfied. The current deduction is $200,000 and the income-limited $100,000 carries forward, subject to future-year limits. This is different from costs excluded by the annual dollar ceiling or phase-out.
Who Qualifies
To claim Section 179, both your business and the asset must meet specific criteria. Property used predominantly outside the United States generally does not qualify, subject to the statutory exceptions identified in Publication 946.
Your Business
Almost any for-profit entity can use Section 179, including sole proprietors, partnerships, LLCs, S corporations, and C corporations. The deduction flows through pass-through entities to owners' personal returns. Estates and trusts cannot make the election. Tax-exempt use and property leased to others have additional restrictions; an LLC’s treatment follows its federal tax classification.
The Asset
Check these five requirements and the exceptions in Publication 946:
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Eligible property. Machinery, equipment, furniture, computers, and qualifying vehicles can qualify. Eligible off-the-shelf software is a separate qualifying category. Land, buildings, and intangibles like patents or copyrights generally do not—though certain improvements to nonresidential buildings (more on that below) are eligible.
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Purchased, not leased. If you finance the equipment through a loan, that still counts as purchased. A lessee cannot claim Section 179 merely by renting equipment. An owner leasing property to others must meet additional rules.
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Used more than 50% for business. If the asset is used 70% for business and 30% personally, you can only deduct 70% of the cost under Section 179—and you must maintain records proving that split.
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Not acquired from related parties. You can't buy equipment from your spouse, parent, child, sibling, or an affiliated business and claim Section 179 on it.
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New to your business. The asset can be new or used, but it must be new to you. Converting personal-use property (like a home office computer you've had for years) to business use doesn't qualify.
What Qualifies: Concrete Examples
The list of qualifying property is broader than many owners realize.
Equipment and Machinery
Manufacturing equipment, tools, tractors, excavators, commercial kitchen appliances, medical devices, printing presses, and practically any other machine used in your trade or business qualifies.
Office Furniture and Equipment
Desks, chairs, filing cabinets, conference tables, printers, copiers, and servers are all standard qualifying items.
Computers and Off-the-Shelf Software
Laptops, desktops, and monitors can qualify. Off-the-shelf software must be available to the general public, subject to a nonexclusive license, and not substantially modified. Worth noting: subscription software (SaaS) typically does not qualify because it's treated as a service expense, not a purchased asset—though it's usually fully deductible as a regular business expense anyway.
Certain Vehicles
Vehicle classification matters as much as weight:
- Passenger automobiles at or below 6,000 lb: Annual passenger-auto depreciation limits can cap the combined Section 179, bonus, and regular depreciation deduction. The weight test generally uses unloaded gross vehicle weight for cars and GVWR for trucks and vans; do not apply a single GVWR rule to every passenger car.
- Passenger-type SUVs over 6,000 through 14,000 lb GVWR: The 2026 Section 179 cap is $32,000 per vehicle. It is a cap on Section 179, not necessarily on combined depreciation.
- Vehicles over 14,000 lb GVWR: The SUV-specific cap does not apply, but ordinary eligibility, business-use, annual dollar, and business-income limits still do.
- Exceptions within the heavy-vehicle category: The SUV cap excludes vehicles seating more than nine passengers behind the driver; vehicles with a cargo area at least six feet long inside and not readily accessible from the passenger compartment; and certain fully enclosed cargo vehicles meeting the IRS design conditions. A cargo van is not automatically exempt just because it lacks rear seats. Check the full design test in Publication 946 before relying on an exception.
GVWR stands for Gross Vehicle Weight Rating, a manufacturer-assigned figure usually found on a sticker inside the driver's door frame. Don't guess—verify.
Nonresidential Building Improvements
The building purchase itself does not qualify under Section 179. An election can cover qualified improvement property (eligible interior improvements, excluding enlargement, elevators/escalators, and internal structural framework) and the following improvements placed in service after the nonresidential building was first placed in service:
- Roofs
- HVAC systems
- Fire protection and alarm systems
- Security systems
This is a significant planning opportunity. A $100,000 commercial HVAC replacement that would otherwise be depreciated over 39 years can often be expensed in a single year.
Section 179 vs. Bonus Depreciation: Which Comes First?
Section 179 isn't the only accelerated deduction available. Bonus depreciation is a separate mechanism that also allows immediate expensing—but the rules differ in important ways.
For qualified property acquired and placed in service after January 19, 2025, bonus depreciation is back to 100%. Unlike Section 179, bonus depreciation:
- Has no overall dollar cap
- Has no income limit (it can create or increase a net operating loss)
- Generally applies automatically to qualifying property unless you elect out for the relevant property class
- Generally requires the asset be new to the taxpayer (used property rules are specific)
IRS rules require most businesses to apply Section 179 first, then bonus depreciation on any remaining basis. In practice, combining both often allows businesses to fully expense 100% of qualifying purchases in year one.
Why use Section 179 at all if bonus depreciation is 100% with no cap? A few reasons:
- Asset-by-asset choice: Section 179 can be elected selectively per asset; bonus depreciation is all-or-nothing per asset class.
- State tax conformity: A US state return may treat Section 179 and bonus depreciation differently from the federal return. Check that state’s current rules separately.
- Control over taxable income: The Section 179 business-income ceiling and asset-by-asset election can affect the timing of deductions. Model owner-level limits and other deductions as well.
Working through which combination produces the best after-tax outcome often requires running the numbers under multiple scenarios.
How to Claim Section 179: Step by Step
Step 1: Confirm the Asset Qualifies
Run through the eligibility checklist above before you file—ideally before you buy. Weight ratings, "new to you" status, and business-use percentage are all common disqualifiers.
Step 2: Place the Asset in Service During the Tax Year
"Placed in service" doesn't mean paid for—it means ready and available for its intended business use. If you paid for a machine in December 2026 but it didn't arrive and get set up until January 2027, the deduction belongs on your 2027 return.
Step 3: Calculate Your Deduction
Multiply the cost by the business-use percentage (if less than 100%). Confirm it's within the annual cap and the phase-out threshold. Calculate the business-income limitation using the IRS adjustments, including any applicable entity- and owner-level limits.
Step 4: File Form 4562
Use the tax-year version of Form 4562, Depreciation and Amortization. In the currently available 2025 form, Part I includes:
- Line 1–5: Dollar limits and phase-out calculations
- Line 6: Description, cost, and elected Section 179 amount for each property
- Lines 10–13: Prior-year carryover, business-income limit, allowed deduction, and carryover to the next year
Listed property, including many vehicles, also requires Part V; its elected cost feeds into Part I. Follow the applicable form instructions rather than reporting every vehicle only on line 6.
Attach Form 4562 to your main business return (Schedule C, Form 1065, Form 1120-S, or Form 1120 depending on entity type).
Common Mistakes to Avoid
1. Assuming Every SUV Qualifies for the Full Deduction
Vehicle trims can have different weight ratings. Verify the manufacturer’s rating and the IRS vehicle category; neither a model name nor a dealer’s “write-off” claim proves eligibility. Even a vehicle outside the SUV cap remains subject to the other deduction limits.
2. Overstating Business-Use Percentage
Claiming a vehicle is used 95% for business when realistic usage is closer to 60% is a red flag in an audit. If the IRS disagrees with your claimed percentage and the actual business use is at or below 50%, you lose Section 179 entirely—and may have to recapture prior deductions as income.
3. Recreating Mileage Logs After the Fact
Retroactively reconstructed mileage logs have little credibility with the IRS. Maintain contemporaneous records—ideally a mileage tracking app that time-stamps trips—throughout the year.
4. Forgetting the Placed-in-Service Rule
Buying an asset in December doesn't lock in a current-year deduction if you can't put it to work until the following year. For example, a new CNC machine that still needs installation and is not ready for its intended use on December 31 has not yet been placed in service.
5. Miscalculating the Business-Income Limit or Losing the Carryforward
Track the amount disallowed specifically by the business-income limit separately from other undeducted basis. That income-limited amount can carry forward, but future dollar and business-income limits still apply. Keep the carryforward schedule with Form 4562.
6. Missing the Recapture Trap
If business use drops to 50% or less during the asset’s recovery period, you may have to recapture part of the earlier Section 179 benefit as ordinary income. This catches owners who deduct a vehicle heavily, then drift toward more personal use.
Keeping Good Records Throughout the Year
The single biggest factor in successfully claiming Section 179 isn't your CPA's skill—it's your own recordkeeping. Before tax season arrives, you should have:
- Invoices and proof of payment for every qualifying purchase
- Vendor relationship documentation (confirming the seller isn't a related party)
- The date the asset was placed in service
- Business-use percentage, with a contemporaneous usage log
- Manufacturer documentation showing GVWR for any vehicle
- Fixed-asset register showing prior-year depreciation elections
The businesses that capture the maximum Section 179 benefit year after year share one habit: they treat fixed-asset tracking as a year-round discipline, not a scramble in March and April. Clean books make deductions defensible—and they reveal opportunities you'd otherwise miss.
Keep Your Books Section 179-Ready
Section 179 only pays off if you can prove every claim you make on it—invoices, in-service dates, business-use percentages, and clean depreciation schedules. Beancount.io offers plain-text accounting that's transparent, version-controlled, and AI-ready, so you can retain and review your fixed-asset records without getting locked inside a proprietary platform. Get started for free and see why developers, finance professionals, and growing businesses are switching to plain-text accounting.
