Section 179 vs Bonus Depreciation: How to Choose in 2026
By AE Tax Advisors ยท Published 2026-08-10
Updated November 8, 2026.
Section 179 and bonus depreciation can accelerate deductions, but they have different eligibility requirements and elections. The right comparison starts with the asset list, business income, service dates and state returns. Neither provision guarantees that a resulting loss can offset every other source of income.
Section 179 provides asset-level control with limits
For tax years beginning in 2026, the federal Section 179 deduction limit is $2,560,000 and begins to phase out when qualifying property placed in service exceeds $4,090,000. The business-income limit can further restrict the current deduction, with eligible disallowed amounts carried forward. Entity and owner-level limitations can both matter for pass-through businesses.
You can elect an amount for specific eligible assets rather than expensing every item in a recovery class. The business-income calculation is technical and is not always the same as one business's profit before depreciation. Review other qualifying income and the current Form 4562 instructions.
Bonus follows its own property and timing rules
Qualifying property acquired and placed in service after January 19, 2025 generally receives a 100% additional first-year allowance unless an applicable election changes the treatment. A short recovery period alone does not prove eligibility. Acquisition, prior-use, related-party and mandatory-ADS rules matter, and older acquisitions can have different rates.
Bonus generally does not have the Section 179 business-income ceiling and can contribute to a tax loss. Basis, at-risk, passive-activity, excess-business-loss and net-operating-loss rules can nevertheless limit the current tax benefit. A deduction and a currently usable refund are different results.
Compare what property each rule reaches
Section 179 can cover specified improvements to existing nonresidential real property, including qualifying roofs, HVAC, fire-protection, alarm and security systems. Eligibility, business use and the other limits still apply. Those improvements are not automatically bonus-eligible merely because Section 179 covers them.
Rental property requires a specific review. Section 179 active-conduct requirements and restrictions on certain property leased by noncorporate lessors differ from Section 469's passive-activity tests. Do not conclude that material participation automatically makes every rental component Section 179 eligible, or that the word rental automatically answers every eligibility question.
Election scope changes the flexibility
Section 179 generally lets the taxpayer choose specific eligible property and amounts. Electing out of bonus generally applies to the relevant class of property placed in service during the year. Model the whole class and applicable special elections rather than assuming a separate bonus choice for every asset.
The calculation generally applies Section 179 first, bonus to the remaining eligible basis next, and regular depreciation last. Proper order prevents deductions from exceeding basis. Keep schedules for federal and state differences.
Use a projection rather than a blanket winner
- List each asset, cost, business use and service date.
- Determine eligibility under each provision independently.
- Calculate Section 179 dollar, phaseout and income limits.
- Test bonus elections and the effect on every asset in the class.
- Review current state conformity by jurisdiction and entity type.
- Model usable current deductions, carryforwards and later sale consequences.
A state may require an addback and later adjustments even when federal law allows an immediate deduction. Rates and conformity change; a generic state label cannot replace a current return-specific calculation. Bring your asset ledger and projected income for review, and use the MACRS guide for the remaining basis.
Frequently Asked Questions
Is Section 179 always better when a state disallows bonus?
No. Check the state Section 179 limits, eligibility, entity rules and future adjustments alongside the federal result.
Can bonus depreciation create a loss?
It can contribute to a loss because it lacks the Section 179 business-income ceiling. Other limitations may defer use of that loss.
Can I choose bonus for only one asset in a class?
Bonus elections generally operate by property class. Section 179 generally offers asset-level choices, subject to its separate requirements.
Sources and update notes
Source references and the changes described in this guide were checked November 8, 2026. Published by AE Tax Advisors; see our editorial policy. Examples are illustrative and require review of your records before filing.