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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Section 179 and bonus depreciation can both accelerate a federal tax deduction for eligible business equipment, but they work differently. Section 179 is an election limited by an annual dollar cap, an investment phaseout, and the taxpayer’s active-business income. Bonus depreciation is a special first-year allowance that generally applies to eligible property unless the taxpayer elects out. Which rule applies—and how much can be deducted—depends on the property, its acquisition and placed-in-service dates, business use, and the taxpayer’s circumstances.
Section 179 vs. bonus depreciation at a glance
| Question | Section 179 | Bonus depreciation |
|---|---|---|
| What is it? | An election to expense some or all of the cost of eligible property in the year it is placed in service. | A special first-year depreciation allowance for certain qualified property under Internal Revenue Code section 168(k). |
| How does it apply? | The taxpayer chooses whether to claim it, and may elect to expense less than the available maximum. | Generally applies to eligible property unless the taxpayer elects out under the applicable rules. |
| Main limitations | Annual dollar limit and investment phaseout, followed by an active-business-income limit. | Eligibility, acquisition and placed-in-service dates, and election rules. It does not use Section 179’s dollar cap or business-income limit. |
| Can it apply after the other rule? | May be applied to selected property; other depreciation rules may apply to eligible remaining basis. | May apply to eligible remaining basis after a Section 179 deduction, subject to the rules for the property and tax year. |
| Federal figures for 2025 | $2,500,000 general limit, phased down when eligible property placed in service exceeds $4,000,000; qualifying SUV limit is $31,300. | Generally 100% for certain qualified property acquired and placed in service after January 19, 2025. Certain property acquired before January 20 and placed in service in 2025 generally has a 40% allowance, or 60% for specified categories. |
| Federal figures for 2026 | $2,560,000 general limit, phased down by eligible property cost over $4,090,000; qualifying SUV limit is $32,000. | The cited IRS guidance describes 100% for certain qualified property acquired and placed in service after January 19, 2025, subject to eligibility and election rules. |
The Section 179 amounts above are federal limits for the stated tax years, as reported by the IRS. The bonus-depreciation percentages depend on the property category and the dates that property was acquired and placed in service; they are not a blanket rate for every equipment purchase.
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How Section 179 works
Section 179 lets a taxpayer elect to deduct all or part of the cost of eligible property in the tax year the property is placed in service. The election is not an unlimited write-off: the available amount is constrained first by the annual dollar limit and investment phaseout, then by the active-business-income limit.
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Annual limit and investment phaseout
For tax years beginning in 2025, the IRS states a general Section 179 maximum of $2,500,000. That limit is reduced by the amount eligible property placed in service exceeds $4,000,000. For tax years beginning in 2026, IRS Publication 946 states a $2,560,000 general maximum, reduced by eligible property cost over $4,090,000. A separate limit applies to qualifying sport utility vehicles: $31,300 for the stated 2025 tax year and $32,000 for 2026.
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These are federal amounts for those tax years. They should not be carried over to other years or treated as a statement of state tax treatment. The applicable tax year is the year the taxpayer’s tax year begins, and the investment phaseout depends on the cost of eligible property placed in service during that year.
Business-income limit and carryforward
The Section 179 deduction is also limited by the taxpayer’s active-business income. A taxpayer can therefore have eligible property and room under the dollar cap but still be unable to deduct the full elected amount in the current year. Amounts disallowed by the business-income limit may generally carry forward to a later year, subject to the applicable rules.
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Business use and recapture
Property used partly for personal purposes may have a restricted deduction, and listed property has additional requirements. If business use falls to 50% or less during the recovery period, Section 179 recapture may apply. The business-use share and how it changes after the deduction are therefore relevant—not just the original purchase price.
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How bonus depreciation works
Bonus depreciation is the common name for the special depreciation allowance under Internal Revenue Code section 168(k). Under current IRS guidance, certain qualified property acquired and placed in service after January 19, 2025, receives a 100% special depreciation allowance unless the taxpayer elects out. Eligibility is specific: it includes certain tangible MACRS property with a recovery period of 20 years or less, certain software, and other categories. Certain used property may qualify, but not every used asset or business purchase does.
Why 2025 purchases can have different rates
For the transition around January 20, 2025, the acquisition date matters as well as the placed-in-service date. Certain qualifying property acquired before January 20 and placed in service during 2025 generally receives a 40% allowance. Certain long-production-period property and aircraft can receive 60%. By contrast, the IRS describes a 100% allowance for certain qualified property acquired and placed in service after January 19, 2025. Eligibility and election rules still apply in each case.
As a result, saying “2025 equipment gets 100% bonus depreciation” is too broad. A purchase’s category, acquisition date, placed-in-service date, and any applicable election must be checked before determining the rate.
Electing out
Bonus depreciation generally applies to qualifying property unless the taxpayer elects out under the applicable rules. That makes it different from Section 179, which the taxpayer elects to claim. An election out can be relevant when the taxpayer does not want the full first-year allowance, but the choice has tax-year and property-class rules; it is not an informal adjustment to a deduction already claimed.
Can you use both deductions on the same equipment?
Potentially, yes. For eligible property, a taxpayer may claim Section 179 for an elected portion of cost and then apply other depreciation rules, including bonus depreciation where available, to eligible remaining basis. Regular depreciation may apply to basis left after those allowances. The IRS’s computer example describes Section 179, bonus depreciation on remaining qualifying cost, and regular depreciation as possible routes.
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The deductions cannot cumulatively exceed the taxpayer’s cost basis: the IRS states that a taxpayer can never deduct more than the cost. Nor does the possibility of combining rules mean that every asset qualifies for every method. Each step depends on that property’s eligibility, business-use percentage, dates, and the taxpayer’s elections and limitations.
Example: a business computer
The IRS uses a business computer to illustrate the alternatives. A taxpayer may elect Section 179 for qualifying cost up to the applicable limit, recover remaining eligible cost with additional first-year depreciation if the rules allow it, or use regular depreciation. In the IRS example, regular depreciation uses a five-year recovery period. This illustration shows that the methods can be alternatives or can apply to different portions of basis; it does not establish that a particular computer qualifies or recommend one treatment for a particular business.
Which rule should a business consider?
There is no universally better choice. The result depends on what property qualifies, when it was acquired and placed in service, the available Section 179 limits, active-business income, business use, and the taxpayer’s broader tax situation. An immediate deduction is a deduction from taxable income, not a tax credit and not a dollar-for-dollar reduction in tax equal to the equipment’s purchase price.
- Review Section 179 when the taxpayer wants to elect an expense amount for selected eligible property and has considered the dollar cap, investment phaseout, business-income limit, and possible carryforward.
- Review bonus depreciation when the property may meet section 168(k) requirements and its acquisition and placed-in-service dates determine an allowance; also consider whether an election out applies or is appropriate.
- Compare the remaining basis after any Section 179 election and determine which depreciation rules may apply to that basis. Do not assume that stacking deductions eliminates the cost-basis ceiling.
- Check business use and any listed-property requirements, including the possibility of recapture if business use later falls to 50% or less.
- Confirm the tax year and jurisdiction before relying on a limit or percentage. State conformity and individual tax consequences may differ from the federal rules described here.
How to claim and verify the treatment
The IRS uses Form 4562 to claim depreciation and amortization and to make a Section 179 election. Use the instructions for the applicable tax year together with the corresponding IRS Publication 946 to check reporting and election details. Because the federal rules and figures are year-specific, a business deciding how to treat an asset should verify its dates, eligibility, business-use share, and taxpayer-specific limits with a tax professional familiar with business depreciation.
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