What is the Section 179 deduction and how much can I claim?

Section 179 lets a business elect to expense the cost of qualifying property in the year placed in service, instead of depreciating it. The annual dollar cap is indexed for inflation and changes each year — confirm the current ceiling on IRS Pub. 946 before claiming.

What property qualifies for Section 179 expensing?

Tangible personal property (machinery, equipment, vehicles over 50% business-use, office furniture, computers), qualified real property (improvements to nonresidential real property like roofs, HVAC, security systems), and off-the-shelf software. The asset must be acquired and placed in service within the tax year.

What happens if I claim Section 179 in a loss year?

§179(b)(3)(A) caps the deduction at the aggregate taxable income from the active trade. Any disallowed amount carries forward to future tax years — confirming the carryforward on the asset ledger prevents a re-disallowance on exam.

How does Section 179 differ from bonus depreciation?

Section 179 lets you pick which assets to expense (subject to the cap) and apply it selectively. Bonus depreciation is automatic on the entire class of eligible property with a longer phase-out timeline. Stacking both is common — applied correctly, §179 first up to the cap, then bonus on the remainder.

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Section 179 equipment expensing

Section 179 deduction: how to expense equipment

Section 179 lets small businesses expense qualifying equipment immediately. Limits, eligible property, the §179(b) business-use %, the taxable-income cap, and how to elect on Form 4562.

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Citation backbone

This article rests on the IRC section below — every recommendation Taxerity.AI surfaces cites this same scaffolding.

IRC § 179 IRS Pub. 546

Who can claim this

Who qualifies for the section 179 equipment expensing

Placed-in-service asset over $2,500 categorized on a 1099-K vendor line, eligible for immediate expensing.

Vendor invoice ledger redacted — single line item ≥ $2,500, placed in service within the tax year.
Business-use percentage on the asset record ≥ 50% (qualifies under §179(b) without bonus limit interaction).
Total §179 elections on prior-year returns stay under the taxable-income cap — no carryforward risk.

How to claim — step-by-step

How to claim the section 179 equipment expensingon this year's return

Vendor invoice ledger redacted — single line item ≥ $2,500, placed in service within the tax year.
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Business-use percentage on the asset record ≥ 50% (qualifies under §179(b) without bonus limit interaction).
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Total §179 elections on prior-year returns stay under the taxable-income cap — no carryforward risk.
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What catches practitioners off guard

The risk to review

Why AI + human review matters here

§179 is capped at taxable income from the active trade — owners in a loss year carry the deduction forward, and the new §179 limit changes each year.

Taxerity.AI surfaces this and similar items for your firm's reviewer. The AI does the research; you keep the final judgment on whether the workload and evidence pattern warrant the deduction on a specific client's return.

FAQ

Common questions about the section 179 equipment expensing

Quick answers to the questions solo CPAs and enrolled agents ask us most often about this deduction.

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