Section 179 Deduction 2026 Guide: Expensing Limits, Bonus Depreciation, and Qualified Property Under IRC 179

Section 179 of the Internal Revenue Code allows a business to elect to deduct the cost of qualifying property in the year the property is placed in service rather than recovering the cost through depreciation over multiple years. The provision is one of the most useful tools for small and mid-sized businesses because it can convert a multi-year depreciation schedule into a single-year deduction, reducing taxable income now rather than later. The mechanics are straightforward in outline but contain several limits, definitions, and interactions with bonus depreciation and the rest of the depreciation system.

The 2026 deduction limit and the threshold at which the deduction begins to phase out are indexed for inflation each year by the IRS in revenue procedures. For tax years beginning in 2026, the deduction limit is generally indexed above the long-running $1,160,000 baseline, and the phaseout threshold begins above the $2,890,000 baseline. Each year the IRS publishes the precise indexed numbers in a revenue procedure, and Form 4562 instructions and IRS Publication 946 explain how to apply them. Where this guide cites $1,160,000 and $2,890,000, the actual indexed figures for 2026 should be confirmed in the latest IRS revenue procedure before filing.

The most common Section 179 transactions are equipment purchases for trades or businesses, certain qualified improvements to nonresidential real property, computer software, and certain vehicles. The deduction interacts with bonus depreciation, the de minimis safe harbor, and the rules for listed property. Together these rules let many businesses fully expense most of their tangible property in the year of purchase, but they also include limits and traps for vehicles and personal-use property.

This page walks through the limits, qualified property rules, vehicle limits, election mechanics, recapture rules, and the relationship between Section 179 and Section 168(k) bonus depreciation. The structure follows IRS Publication 946 because that publication is the controlling reference for property classification, recovery periods, and depreciation method choices.

The Section 179 deduction is built around three numbers. The first is the maximum deduction for the year, which is set by IRC Section 179(b)(1) and is indexed for inflation. The second is the investment phaseout threshold, which is set by IRC Section 179(b)(2) and is also indexed for inflation. The third is the taxable income limit, which is set by IRC Section 179(b)(3) and limits the deduction to taxable income from the active conduct of any trade or business. Disallowed amounts under the income limit can generally be carried forward.

Limit	2026 figure	Source
Maximum Section 179 deduction	Approximately $1,160,000 indexed; verify latest IRS revenue procedure	IRC 179(b)(1) and IRS revenue procedures
Investment phaseout begins	Approximately $2,890,000 indexed; verify latest IRS revenue procedure	IRC 179(b)(2) and IRS revenue procedures
Bonus depreciation rate	60 percent for property placed in service in 2026 under the current phasedown	IRC 168(k) and IRS Publication 946
Taxable income limit	Limited to active trade or business taxable income with carryforward	IRC 179(b)(3)

The phaseout reduces the maximum deduction dollar for dollar by the amount that total Section 179 property placed in service during the year exceeds the phaseout threshold. A business with eligible purchases above the threshold may still take Section 179 for some property but will see the maximum reduced. Once total purchases exceed the maximum plus the threshold, the Section 179 deduction is fully phased out for the year.

Section 179(d) defines Section 179 property as tangible personal property used in the active conduct of a trade or business that is depreciable under MACRS, off-the-shelf computer software, and certain qualified real property. Qualified real property includes qualified improvement property and certain improvements to nonresidential real property such as roofs, heating, ventilation, and air conditioning property, fire protection and alarm systems, and security systems. The exact list and effective dates trace back to changes made by the Tax Cuts and Jobs Act of 2017 and later technical corrections.

Tangible personal property is the broadest category. It includes machinery, equipment, furniture, fixtures, computers, peripherals, signage, and many other items that are used in the trade or business. Land and buildings are not tangible personal property, although certain improvements to nonresidential real property may qualify as qualified real property. Inventory does not qualify because it is not depreciable. Property used in lodging, with limited exceptions, has historically been restricted; the rules now permit lodging property in many cases for Section 179.

Off-the-shelf computer software is included as Section 179 property if it is readily available to the general public, subject to a nonexclusive license, and not substantially modified. Customized software developed for a single customer may not qualify. Cloud subscriptions are generally treated as services rather than property and do not qualify for Section 179, although their tax treatment as ordinary deductions is usually favorable.

Section 280F places limits on depreciation deductions for passenger automobiles and certain other listed property, and Section 179 inherits a special limit for sport utility vehicles with a gross vehicle weight rating above 6,000 pounds and not more than 14,000 pounds. The SUV limit is indexed for inflation and is significantly lower than the general Section 179 maximum. Heavy SUVs, vans, and trucks above the weight thresholds may qualify for the SUV-specific Section 179 cap and for the general bonus depreciation rules, depending on the vehicle.

Passenger automobiles, lighter pickups, and smaller crossovers face the Section 280F luxury auto depreciation caps that limit the amount of first-year depreciation deduction. The IRS publishes annual depreciation caps for passenger automobiles and trucks and vans in a revenue procedure. Bonus depreciation can increase the first-year cap for property that qualifies, but the underlying caps still apply. As with Section 179, the actual figures should be confirmed in the most recent IRS revenue procedure for the year the vehicle is placed in service.

The vehicle area is also where personal use and listed property rules matter. A vehicle used less than 50 percent for business does not qualify for Section 179 and may be subject to alternative depreciation. Recordkeeping for business use is essential because the IRS expects contemporaneous logs or comparable evidence.

Bonus depreciation under IRC Section 168(k) was 100 percent for property placed in service from late 2017 through 2022, then began phasing down. Under current law, the bonus rate is 80 percent for 2023, 60 percent for 2024 and historically through phasedown sequencing, and continues to step down by 20 percentage points per year until it reaches zero. For property placed in service in 2026, the bonus rate under the current phasedown is 60 percent in many planning summaries; taxpayers should verify the rate applicable to their placed-in-service date because Congress has periodically considered legislation that changes the schedule.

Bonus depreciation differs from Section 179 in several ways. There is no overall dollar cap. There is no taxable income limit, so bonus depreciation can create a net operating loss. It applies to qualified property by class life rather than the Section 179 list, and the order of application generally has Section 179 taken first, then bonus depreciation, then regular MACRS depreciation. Some states do not conform to bonus depreciation, so a federal benefit may not flow through to state taxable income without modifications.

For 2026 planning, the most useful step is to model a purchase under both Section 179 and bonus depreciation, including the state conformity status, before deciding which property to expense. A business with low taxable income may prefer bonus depreciation to preserve a Section 179 carryforward.

The Section 179 election is made on Form 4562, Depreciation and Amortization. Part I of Form 4562 reports the Section 179 deduction with line-by-line entries for the cost of property, the elected cost, the maximum dollar limitation, the investment phaseout reduction, and the taxable income limit. The form is attached to the return for the year the property is placed in service. Once made, the election is generally irrevocable for the property listed on the form, although the IRS allows revocation under specified circumstances by filing an amended return within the period of limitations.

The election can be made for a portion of the cost of an item rather than the full cost. A business that wants to elect Section 179 for $50,000 of a $100,000 piece of equipment and depreciate the rest under MACRS may do so. The election must be applied at the asset level, not the dollar level, in the sense that each item placed in service has a Section 179 cost on the form, but the elected amount per item can vary.

Pass-through entities apply Section 179 at the entity level by allocating Section 179 deductions to partners or shareholders, who then apply their own taxable income limit and dollar cap at the individual level. The combined effect is that an individual partner cannot exceed the personal Section 179 cap across all activities even if multiple entities allocate amounts.

Section 179 recapture under IRC Section 1245 applies when property on which Section 179 was deducted is later disposed of in a way that triggers recapture, or when business use of listed property drops to 50 percent or less. The recapture amount is generally the excess of the Section 179 deduction taken over the depreciation that would otherwise have been allowed. Recapture for listed property is reported on Form 4797 in many cases. Vehicles with falling business use are the most common recapture trigger for small businesses.

Recordkeeping for recapture is the same recordkeeping that supports the original deduction. Mileage logs, contemporaneous notes, repair history, and business-use percentages should all be retained for the entire holding period of the asset and for the period required by the statute of limitations after disposition. A clean recapture is far less painful than a contested recapture with weak records.

The de minimis safe harbor under Reg. 1.263(a)-1(f) allows businesses with an applicable financial statement to expense items costing $5,000 or less per item or invoice, and businesses without an applicable financial statement to expense items costing $2,500 or less per item or invoice, when an annual election is made. The safe harbor is not the same as Section 179. It allows expensing without putting the property on the depreciation schedule at all. Many small businesses combine the safe harbor for small items with Section 179 for larger purchases, leaving only a thin set of items to depreciate under MACRS.

Routine maintenance safe harbors and the related capitalization regulations also affect what gets expensed and what gets capitalized. The capitalization regulations are technical and have meaningful effect for businesses with mixed repair, improvement, and replacement spending. They do not change Section 179 directly, but they change which costs are even available for Section 179 because only items that are properly capitalized are eligible.

Scenario 1: Small contractor buys a heavy truck

A contractor buys a heavy work pickup with a gross vehicle weight rating of 8,500 pounds for $75,000 and uses it 100 percent for business. The vehicle is over the 6,000 pound threshold and not subject to the passenger automobile cap. Section 179 may be elected up to the indexed SUV-specific cap for the year, with the remainder eligible for bonus depreciation and MACRS. Records of business use and a clean title and finance package are essential.

Scenario 2: Medical office buys equipment and improvements

A medical office spends $300,000 on diagnostic equipment and $150,000 on qualified improvement property. Section 179 may apply to both. Bonus depreciation may also apply if the property qualifies. The business should compare a Section 179 election against bonus depreciation taking into account the taxable income limit, the state conformity rules, and any plans to sell the practice in the next several years. The order of application can change the carryforward result.

Scenario 3: Software-heavy services firm

A services firm spends $40,000 on off-the-shelf software and $20,000 on workstations. Off-the-shelf software is qualifying Section 179 property. The firm can elect Section 179 for the workstations and the software, subject to the dollar cap and taxable income limit. Cloud subscriptions are not Section 179 property, but they are generally deductible as ordinary expenses.

Scenario 4: Small ecommerce business with high purchases

An ecommerce business spends $3,200,000 on warehouse equipment and racking. The investment exceeds the phaseout threshold. The maximum Section 179 deduction is reduced by the excess. The business may pair a partial Section 179 election with bonus depreciation and MACRS to manage the remaining basis.

Primary references for this page are IRC Section 179, IRC Section 168(k) for bonus depreciation, IRC Section 280F for vehicle limits, and IRS Publication 946 at irs.gov/forms-pubs/about-publication-946. The Form 4562 page is at irs.gov/forms-pubs/about-form-4562. The annual indexed limits and luxury auto depreciation caps are released each year in IRS revenue procedures, which should be consulted directly before filing.