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- How the election differs from regular depreciation
- 2025 dollar and phaseout limits
- The business-income limit is separate
- What property can qualify
- Placed in service means ready and available
- Business use must generally exceed 50%
- Vehicle limits require multiple tests
- Related-party and leasing restrictions
- Section 179 and bonus depreciation are different
- Election, amendment, and revocation
- A simplified limit example
- Federal and state boundaries
- Sources
Key Facts
- Federal level: Section 179 permits an election to expense qualifying business property rather than recover all of its cost through regular depreciation.
- Federal level: For tax years beginning in 2025, the maximum deduction is $2,500,000 and begins phasing out when qualifying property placed in service exceeds $4,000,000.
- Federal level: The deduction cannot exceed taxable income from active trades or businesses, but a disallowed amount can generally carry forward.
- Federal level: Property generally must be acquired by purchase, placed in service, and used more than 50% in an active trade or business.
- Federal level: The 2025 section 179 limit for a heavy SUV and certain similar vehicles is $31,300, while passenger automobiles also face separate depreciation limits.
Section 179 is an elective federal cost-recovery rule for qualifying business property. It can move a deduction into the year property is placed in service, but it does not make every purchase immediately deductible. Eligibility, business use, annual investment, taxable income, vehicle rules, and other depreciation elections all affect the result.
How the election differs from regular depreciation
Regular depreciation spreads adjusted basis over a statutory recovery period. A section 179 election expenses selected cost in the placed-in-service year, subject to limits, and reduces the basis left for bonus depreciation or regular MACRS depreciation.
The election is made in Part I of Form 4562. A separate Form 4562 can be required for each business or activity, while the overall section 179 limitation is coordinated across the return.
2025 dollar and phaseout limits
For a tax year beginning in 2025, the maximum section 179 deduction is $2,500,000. The limit is reduced dollar for dollar by the cost of section 179 property placed in service above $4,000,000, reaching zero at $6,500,000.
The phaseout measures the cost of all qualifying section 179 property placed in service, not only the property selected for the election. Partnerships and S corporations apply limits at the entity level and again through owner-level rules.
The business-income limit is separate
The allowed deduction cannot exceed aggregate taxable income from active conduct of trades or businesses, computed under the section 179 rules. A passive investor is not treated as actively conducting a business merely by owning an interest.
An amount disallowed by the business-income limit generally carries forward. The investment phaseout, by contrast, reduces the maximum election for the current year and is not simply converted into the same kind of income-limit carryover.
What property can qualify
Qualifying property generally includes purchased tangible personal property used in an active trade or business, such as machinery, equipment, furniture, and qualifying computer equipment. Off-the-shelf computer software can qualify when the statutory requirements are met.
Certain qualified real property can be elected into section 179: qualified improvement property and specified improvements to nonresidential real property, including roofs, HVAC property, fire-protection and alarm systems, and security systems.
Land, most buildings and structural components, property held only for investment, and property acquired by gift or inheritance do not qualify under the ordinary purchase rule. Property used mainly outside the United States and property used by certain tax-exempt, governmental, or foreign persons is generally excluded, subject to statutory exceptions.
Placed in service means ready and available
Buying or paying for property is not enough. Property is placed in service when it is ready and available for its assigned business function.
The tax year of delivery, installation, testing, and actual readiness can therefore matter more than the invoice date. Property need not necessarily operate at full capacity, but it must be available for its intended use.
Business use must generally exceed 50%
Listed property and other mixed-use assets generally need predominant business use—more than 50%—for a section 179 election. The deductible cost is limited to the business-use portion.
If business use later falls to 50% or less during the recovery period, recapture can require part of the earlier benefit to be reported as ordinary income. Records of mileage, time, or other reasonable use measures support the business percentage.
Vehicle limits require multiple tests
The 2025 section 179 election for a heavy sport utility vehicle and certain similar vehicles is capped at $31,300. Statutory exceptions cover specified vehicles designed for seating, cargo, emergency services, or other nonpersonal functions.
Passenger automobiles are subject to separate annual depreciation limitations that include section 179 and bonus depreciation. A vehicle’s weight, configuration, acquisition date, business-use percentage, and eligibility for bonus depreciation can all change the maximum first-year deduction.
A vehicle does not qualify merely because a business owns it. Predominant qualified business use and substantiation rules still apply.
Related-party and leasing restrictions
Section 179 property must generally be acquired by purchase, and the Code excludes specified acquisitions from related persons or entities. A noncorporate lessor also generally cannot elect section 179 for property leased to others unless a statutory manufacturing or short-term-lease exception applies.
Section 179 and bonus depreciation are different
Section 179 is elective asset by asset and is constrained by the investment and business-income limits. Bonus depreciation applies to qualified property under section 168(k), uses separate acquisition and placed-in-service rules, and can create or increase a net loss.
For eligible property acquired after January 19, 2025, current 2025 instructions describe a 100% special depreciation allowance, with an election for specified alternative treatment in the first affected year. Ordering generally applies section 179 first, then bonus depreciation, then regular depreciation to the remaining basis.
Election, amendment, and revocation
The election identifies the property and cost selected on Form 4562 filed with an original return or a qualifying amended return. A timely revocation can be made without advance IRS consent, but once made under the current procedure it is irrevocable for that property and year.
Election choices affect later basis, depreciation, gain or loss, and possible recapture. The article on S corporation provides broader entity-classification context but does not change section 179’s property rules.
A simplified limit example
Assume a calendar-year active business places $4,400,000 of qualifying property in service during 2025. Before the taxable-income limit, the $2,500,000 maximum is reduced by the $400,000 excess over the $4,000,000 threshold, leaving a $2,100,000 maximum election.
The actual deduction can be lower because of elected cost, business-use percentages, taxable income, vehicle caps, entity-owner limits, or other property-specific rules.
Federal and state boundaries
Section 179 is a federal income-tax rule. States may conform, decouple, use different limits, or require additions and later subtractions; federal sources do not establish a particular state’s treatment.
