Section 179 Deduction Guide 2026

What Is the Section 179 Deduction?

IRC §179 is the statutory authority that lets a business immediately expense (rather than capitalize and depreciate over years) the cost of qualifying tangible business property placed in service during the tax year. It was first enacted in 1958 as a small-business tax simplifier with an original dollar limit of $2,000. The limit has ratcheted up across multiple legislative cycles - PATH Act of 2015 (permanent inflation indexing of the prior $500,000 / $2,000,000 baseline), TCJA §13101 in 2017 ($1,000,000 / $2,500,000), and most recently OBBBA §70301 in 2025, which boosted the figures 2.5x to $2,500,000 / $4,000,000 effective for property placed in service in tax years beginning after December 31, 2024.

The deduction differs from regular MACRS depreciation in three structural ways: (1) the taxpayer elects §179 asset-by-asset on Form 4562, rather than automatically applying it to every depreciable asset, (2) the deduction is capped at a dollar limit per tax year, regardless of how much qualifying property is acquired, and (3) the deduction is limited to the active trade-or-business taxable income of the taxpayer for the year, with the unused amount carried forward to future years.

The 2026 deduction interacts heavily with 100% bonus depreciation under §168(k), which OBBBA §70401 restored permanently for property both acquired AND placed in service after January 19, 2025. The two regimes operate as a stack: §179 elected first, §168(k) bonus absorbs the residual. For many small and mid-sized businesses, electing §179 on selected assets while letting 100% bonus run automatically on the rest produces the optimal year-1 result.

2026 Limits and the Phase-Out Mechanic

Three dollar amounts govern the 2026 deduction (Rev. Proc. 2025-32 §4.24, verified for tax years beginning in 2026): the maximum dollar limit under §179(b)(1) of $2,560,000; the phase-out threshold under §179(b)(2) of $4,090,000; and the heavy-SUV sublimit under §179(b)(5)(A) of $32,000.

How the phase-out works under §179(b)(2)

The maximum dollar limit is reduced (but not below zero) by the amount by which the total cost of qualifying §179 property placed in service during the tax year exceeds the phase-out threshold. Mathematically: Reduced limit = max(0, $2,560,000 - max(0, Total PIS - $4,090,000)). The phase-out is dollar-for-dollar, not graduated, so each additional dollar of placed-in-service property above the threshold removes one dollar from the maximum.

Worked example: a business places $4.3 million of qualifying property in service in 2026. Excess over threshold = $4,300,000 - $4,090,000 = $210,000. Reduced limit = $2,560,000 - $210,000 = $2,350,000. The business can still elect up to $2,350,000 of §179 (subject to the income limit), with the remaining $1,950,000 of basis flowing to bonus depreciation under §168(k).

At $6,650,000 of placed-in-service property in 2026 ($6,500,000 for 2025), the phase-out reduction exactly equals the maximum and §179 is fully eliminated for the year. For acquisitions above the elimination point, 100% bonus depreciation under §168(k) is the only first-year expensing option available.

Qualifying Property Under §179(d)(1)

The deduction applies only to specifically defined "section 179 property" under IRC §179(d)(1) and Treas. Reg. §1.179-4. Three categories of property qualify:

Category 1: Tangible personal property

Machinery, equipment, computers, off-the-shelf software, furniture, fixtures, and most business vehicles used in the active conduct of a trade or business. The property must have a recovery period under MACRS (so non-depreciable assets like land and inventory do not qualify). Off-the-shelf software qualifies under the narrow exception in §179(d)(1)(A)(ii); custom-developed software does not.

Category 2: Qualified Improvement Property (QIP) under §168(e)(6)

Interior improvements to nonresidential real property placed in service after the building was first placed in service. QIP excludes enlargements, elevators or escalators, and internal structural framework. The 15-year MACRS recovery period for QIP was restored by the CARES Act technical correction in 2020 (retroactive to TCJA effective dates). QIP is §179-eligible under the general tangible-property rules and is also eligible for 100% bonus depreciation under §168(k).

Category 3: §179(f) qualified real property improvements

Section 179(f) explicitly extends §179 eligibility to specified improvements to nonresidential real property: roofs (whole-roof replacements, not patches), HVAC systems, fire protection and alarm systems, and security systems. The improvement must be placed in service after the building was first placed in service, must be made by the taxpayer to nonresidential real property, and must be of the specified types. This is a narrower carve-out than QIP but provides clear §179 eligibility for common building-improvement projects that are otherwise depreciable over 39 years.

Three additional eligibility requirements

• Acquired by purchase from an unrelated party. Property acquired from a related party under §267(b) (controlled corporation, sibling, parent, child, grandparent, grandchild, spouse) or §707(b) (50%+ partnership interest) is disqualified under §179(d)(2).
• Placed in service during the tax year. The property must be in a state of readiness and availability for its intended use, not merely ordered or delivered. The IRS scrutinizes year-end placements where the asset arrived December 31 but was not actually operational until January.
• Used more than 50% for business in the year of election. See the dedicated section below.

What does NOT qualify

• Inventory held for sale or resale (this is recovered via cost of goods sold, not depreciation).
• Land (not depreciable).
• Residential rental property (specifically excluded by §179(d)(1)).
• Intangibles other than off-the-shelf software (goodwill, customer lists, patents, copyrights, trademarks - these are amortized under §197 rather than expensed under §179).
• Property used predominantly outside the United States (limited eligibility under §168(g)(4)).
• Property used by a tax-exempt entity (with narrow exceptions).
• Property used by a governmental unit or foreign person.

Heavy SUV Cap and Vehicle Limits

Vehicles are the most heavily regulated category under §179. The interaction of the heavy-SUV cap under §179(b)(5)(A), the §280F luxury-auto limits, and the various exemption categories for trucks and vans produces some of the most complex first-year deduction math in the Code.

The $32,000 heavy-SUV cap under §179(b)(5)(A)

For tax years beginning in 2026, the §179 deduction for any sport utility vehicle with a gross vehicle weight rating (GVWR) between 6,001 and 14,000 pounds is capped at $32,000 ($31,300 for 2025). The cap was enacted in 2004 as part of the American Jobs Creation Act to close the so-called "Hummer loophole" - the prior unlimited §179 expensing on heavy SUVs.

The cap applies to any vehicle that meets all three criteria: (a) "designed primarily to carry passengers over public streets, roads, or highways"; (b) GVWR more than 6,000 pounds and not more than 14,000 pounds; (c) does not fall within one of the four exemption categories below. Common SUVs subject to the cap include the Tahoe, Suburban, Yukon, Escalade, Expedition, Navigator, G-Wagen, Range Rover, GLS, X7, QX80, Wagoneer, and most other large SUVs.

Four exemption categories from the SUV cap

Under Treas. Reg. §1.280F-6 (cross-referenced for §179 purposes), the following vehicles are NOT subject to the $32,000 SUV cap and can use the full §179 dollar limit:

• Pickup trucks with a cargo bed of at least 6 feet (measured interior length). The Ford F-150, Chevy Silverado, RAM 1500, Toyota Tundra, and Nissan Titan all qualify when ordered with the standard or long-bed configuration. Short-bed configurations (under 6 ft) are SUV-capped. The Tesla Cybertruck bed length is approximately 6 ft 4 in - technically exempt but with some practitioner debate about whether the bed-length measurement includes the open tailgate.
• Vans designed to seat more than 9 passengers behind the driver's seat. Commercial passenger vans (15-passenger and larger).
• Vehicles with a fully enclosed driver's compartment and a cargo area no seating behind the driver. Cargo vans, panel vans (Sprinter cargo, Transit cargo).
• Qualified non-personal-use vehicles. Delivery vans, ambulances, hearses, taxi cabs, vehicles modified to be unsuitable for personal use (heavy advertising graphics permanently affixed, no rear seating).

Passenger vehicles under 6,000 lb GVWR - the §280F cap

For passenger automobiles below 6,000 lb GVWR, the §280F "luxury auto" annual depreciation limits apply IN ADDITION TO or in lieu of §179 or bonus depreciation. The 2026 §280F year-1 cap is approximately $20,400 with bonus depreciation election (or $12,400 without bonus) per Rev. Proc. 2025-32 final figures. For passenger vehicles, the §280F cap is usually the binding constraint - §179 and bonus depreciation are limited to amounts that, when added to MACRS, do not exceed the §280F annual cap. Calculator users should consult Form 4562 Part V for §280F-limited vehicles.

Coordination with 100% bonus depreciation

The heavy-SUV cap under §179(b)(5)(A) does NOT apply to bonus depreciation under §168(k). So a heavy SUV's basis above the $32,000 §179 cap can be fully absorbed by 100% bonus depreciation under OBBBA §70401 (for property acquired and placed in service after January 19, 2025). In practice, the SUV cap rarely produces a deferred deduction in 2026 - the residual after the $32,000 cap gets immediately expensed via §168(k). The SUV cap matters most for taxpayers who elect out of bonus depreciation by class of property, or who are placing the SUV in a year before bonus-eligibility (e.g., property acquired before January 19, 2025).

The 50% Business-Use Requirement

Under IRC §179(d)(1), property must be used more than 50% for business in the year of election. The threshold is a strict gate - business use of exactly 50% or less disqualifies the property entirely for §179 purposes in that year (regardless of the dollar amount or property type). The disqualified property must instead recover basis through ordinary straight-line MACRS over its applicable recovery period.

If business use exceeds 50%, the §179 deduction is limited to the business-use percentage of the property cost. For example, a $50,000 qualifying machine used 70% for business has a maximum §179 election of $35,000 ($50,000 x 70%). The remaining 30% basis is personal-use property and is non-depreciable.

Recapture under §179(d)(10) if business use later drops

If business use drops to 50% or less in any year before the property's MACRS recovery period ends, the prior §179 deduction is recaptured under §179(d)(10) and Treas. Reg. §1.179-1(e). The recapture amount equals the excess of (the §179 amount actually taken) over (what straight-line MACRS would have allowed in the years from placed-in-service to the year of the use change). The recapture is included in ordinary income on the §179 owner's return in the year of the use change, reported on Form 4797 Part IV.

Worked recapture example: in 2024 a taxpayer placed a $30,000 qualifying machine in service (5-year MACRS, 80% business use) and elected $24,000 of §179. In 2026, business use drops to 30%. Recapture computation: straight-line MACRS would have allowed approximately $4,800 of depreciation through 2026 (3 years x $30,000 / 5 years x 80%); §179 taken was $24,000; recapture = $24,000 - $4,800 = $19,200, included in 2026 ordinary income. The remaining $4,800 of basis continues to be recovered via straight-line MACRS over the remaining recovery period.

How business use is measured

Business use is measured by reference to time, mileage (for vehicles), or other reasonable methods specified in Treas. Reg. §1.280F-6 for listed property. Vehicles are tracked through a contemporaneous mileage log under §274(d) substantiation rules. Computers and office equipment can be tracked through usage logs, project documentation, or other reasonable records. The IRS has substantial latitude to challenge inflated business-use percentages where the taxpayer's records are inadequate.

The Taxable Income Limit Under §179(b)(3)

IRC §179(b)(3) limits the §179 deduction in any tax year to the aggregate taxable income from active trades or businesses of the taxpayer for the year (computed without the §179 deduction itself). This is the second of two limits (after the §179(b)(2) dollar-amount phase-out) and operates as a hard backstop: the deduction cannot create or increase a net loss.

What counts as active trade-or-business income for individuals

For individuals, Treas. Reg. §1.179-2(c) aggregates the following income sources as the §179(b)(3) limit:

• Schedule C net income from any sole proprietorship business operated by the taxpayer.
• W-2 wages from any employer - critically, Reg. §1.179-2(c)(6) treats employee compensation as derived from the conduct of a trade or business for §179(b)(3) purposes. A taxpayer with $0 Schedule C income but $150,000 of W-2 wages has $150,000 of active trade-or-business income for §179 limit purposes.
• Schedule F net farm income from any farming activity operated by the taxpayer.
• Partnership ordinary income passed through on Schedule K-1 line 1 from partnerships in which the taxpayer materially participates.
• S-corporation ordinary income passed through on Schedule K-1 line 1 from S-corps in which the taxpayer materially participates.
• For spouses filing jointly, both spouses' active trade-or-business income aggregates under §179(b)(3) (Reg. §1.179-2(c)(6)(iv) treats a married couple as one taxpayer for the income limit).

What does NOT count as active trade-or-business income

Portfolio income (interest, dividends, capital gains, royalties from non-business sources) does NOT count. Passive rental income reported on Schedule E generally does NOT count unless the rental activity rises to the level of a trade or business under section 162. Annuity income, pension income, IRA distributions, Social Security benefits, gambling winnings, and other non-business income are excluded.

Carryforward of disallowed amount

Any §179 amount that is disallowed under the §179(b)(3) income limit is carried forward indefinitely under §179(b)(3)(B) and Treas. Reg. §1.179-3. The carryforward retains its character as a §179 deduction and may be claimed in any future year against that year's active trade-or-business income, subject to the same per-year limit. There is no expiration on the carryforward.

Order of limits

The two limits are applied in sequence: (1) §179(b)(2) dollar-amount phase-out is computed first, producing a "reduced dollar limit"; (2) §179(b)(3) income limit is applied to the lesser of (the reduced dollar limit) or (the total §179 amount elected by the taxpayer). Any amount disallowed at step 2 becomes a carryforward.

Section 179 vs 100% Bonus Depreciation

After OBBBA §70401 restored 100% bonus depreciation under §168(k) permanently for property acquired and placed in service after January 19, 2025, the practical choice between §179 and bonus depreciation depends on a handful of fact-specific factors. The two regimes are not mutually exclusive - they stack, with §179 elected first and bonus depreciation absorbing the remaining basis.

The order of operations

1. Section 179 first. The taxpayer chooses how much of the qualifying basis to expense under §179, up to the per-year dollar limit ($2,560,000 for 2026, after §179(b)(2) phase-out) and subject to the §179(b)(3) income limit.
2. Bonus depreciation second. Under §168(k), 100% of the basis remaining after the §179 election is automatically deducted in year-1 - assuming the property is bonus-eligible (qualified property under §168(k)(2), acquired and placed in service after January 19, 2025) and the taxpayer has not opted out of bonus depreciation for the class of property.
3. MACRS regular depreciation third. Any basis remaining after §179 and bonus depreciation recovers through ordinary MACRS over the property's class life (usually 5-year for vehicles and computers, 7-year for office furniture and machinery, 15-year for QIP). For property fully covered by §179 plus 100% bonus, there is no residual MACRS in year 1.

Strategic differences

Hybrid approach example

A profitable single-shareholder S-corp purchases $400,000 of equipment in 2026: $300,000 of new CNC machinery (7-year MACRS, bonus eligible) and $100,000 of new office furniture (7-year, bonus eligible). S-corp ordinary income before depreciation is $250,000. Three strategies:

• Full §179: Elect $400,000 of §179. Entity-level §179(b)(3) limit caps at $250,000. Excess $150,000 carries forward at entity level. Shareholder K-1 shows $250,000 of §179, applied at personal level against shareholder's aggregate active income.
• Full bonus: Skip §179, elect 100% bonus on all $400,000. No income limit. S-corp shows ($150,000) ordinary loss flowing to shareholder K-1, offsetting shareholder's W-2 wages and other ordinary income at the personal level. Generally produces better cash-tax savings if shareholder has W-2 wages or other ordinary income.
• Hybrid: Elect $250,000 of §179 (to entity income limit) and let 100% bonus absorb the remaining $150,000. Same year-1 deduction as full bonus, but the §179 portion preserves slightly different state-tax treatment (e.g., in CA, the $25,000 §179 cap delivers state benefit while bonus gets no state benefit). Optimal for multi-state S-corps with conformity decoupling.

The Form 4562 Election

The §179 election is made on Part I of IRS Form 4562, Depreciation and Amortization. The form must be attached to the original timely filed return (including extensions) for the tax year the property is placed in service. A late election generally requires IRS consent under §179(c)(2) and Rev. Proc. 2008-54, although §179(c)(2) permits amended-return elections within the period of limitations without consent.

Form 4562 Part I line-by-line

• Line 1. Maximum dollar limit: $2,560,000 for 2026.
• Line 2. Total cost of section 179 property placed in service during the tax year.
• Line 3. Phase-out threshold: $4,090,000 for 2026.
• Line 4. Phase-out reduction: cost over the threshold (line 2 - line 3, but not less than zero).
• Line 5. Reduced dollar limit: line 1 - line 4, but not less than zero.
• Line 6. List each property elected: description, cost, elected amount. Use additional sheets if more than one property.
• Line 7. Listed property (vehicles, computers used outside the office) carries over from Part V of Form 4562 if any.
• Line 8. Total elected amounts (line 6 + line 7 amounts).
• Line 9. Tentative deduction (smaller of line 5 or line 8).
• Line 10. Carryover of disallowed deduction from prior year.
• Line 11. Business-income limit (active trade-or-business taxable income from Schedule C / W-2 / K-1 / Schedule F). See line 11 instructions for the aggregation rules.
• Line 12. Section 179 expense deduction: smaller of (line 9 + line 10) or line 11.
• Line 13. Carryover to next year: (line 9 + line 10) - line 12.

Line 12 is the final allowable §179 deduction for the year. It is allocated among the elected properties on lines 6/7 in any reasonable manner the taxpayer chooses (typically pro-rata by elected amount, but the allocation can be optimized for basis-tracking purposes - e.g., taking the full §179 on assets the taxpayer plans to dispose of soonest to minimize future ordinary-income recapture).

Pass-through entity election timing

Partnerships file Form 4562 with Form 1065, electing §179 at the entity level on Form 1065 line 12. The entity-level income limit is applied; the entity-level §179 amount allowed (after the entity income limit) is allocated to partners on Schedule K-1 line 12 in the same ratio as ordinary income. S-corps file Form 4562 with Form 1120-S, electing §179 at the entity level on Form 1120-S line 11, with entity-level income limit and allocation to shareholders on K-1 line 11. Each partner or shareholder then applies the §179(b)(3) income limit AGAIN at the personal level to their K-1 amount on their personal Form 4562 Part I.

Revocation under §179(c)(2)

An election (or revocation of an election) may be made or changed on an amended return without IRS consent for any tax year beginning after 2002, as long as the amended return is filed within the period of limitations under §6511 (generally three years from the original return's due date or two years from the date the tax was paid). Once an election is revoked, it cannot be re-made for the same property in a later year. Common revocation scenarios: discovering that 100% bonus depreciation would have produced a passthrough loss that offsets W-2 income at a higher marginal rate; switching between §179 and bonus for state-tax-optimization purposes; correcting a math error in the original return.

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