Manufacturing Equipment Depreciation: Section 179, Bonus Depreciation, and MACRS Classes for Heavy Machinery

A manufacturer that buys a $1.2 million CNC machining center, a $400,000 conveyor system, and $200,000 in tooling during the same tax year faces a real question: how much of that $1.8 million hits the income statement in year one, and how much gets spread across future periods? The answer depends on how three overlapping depreciation provisions interact. Section 179 lets you expense up to $2,560,000 of qualifying equipment purchases in the year placed in service. Bonus depreciation under the One Big Beautiful Bill Act (OBBBA) now provides a permanent 100% first-year deduction on eligible property, reversing the TCJA phasedown that had been reducing the rate each year. And MACRS class lives determine the recovery period for any remaining basis. Getting the ordering right between these three provisions is the difference between a massive first-year deduction and leaving money on a slower depreciation schedule.

Which MACRS class applies to your manufacturing equipment?

The Modified Accelerated Cost Recovery System (IRC 168) assigns every depreciable asset to a recovery class based on its asset class life. For manufacturers, the four classes that come up most often are the 5-year, 7-year, 10-year, and 15-year property categories.

5-year property covers certain specialized manufacturing and research assets. Semiconductor manufacturing equipment falls here, along with certain computer-based and research-related machinery. If your production process relies on equipment with an ADR midpoint life of less than 10 years, it likely qualifies for the 5-year class, which uses a 200% declining balance method over a 5-year recovery period (with a half-year or mid-quarter convention applied in the first and last years).

7-year property is where the bulk of manufacturing equipment lands. Lathes, milling machines, injection molding presses, welding stations, CNC equipment, packaging machinery, and most general-purpose production equipment all fall into the 7-year class. If you’re buying equipment that sits on a factory floor and makes things, this is your default starting point. The IRS assigns these assets to Asset Class 20.1 through 20.5 (manufacture of various product types), and the 7-year recovery period applies unless the specific asset falls into a shorter or longer class.

10-year property captures specific assets with longer useful lives. Certain food manufacturing equipment and some petroleum refining assets fall here. It’s less common for general manufacturers, but worth confirming when you purchase specialized processing equipment that doesn’t fit neatly into the 7-year category.

15-year property applies to qualified improvement property (QIP), which covers improvements to the interior of nonresidential real property already placed in service. For a manufacturer, this means that if you renovate the interior of your production facility (new flooring, internal walls, electrical and plumbing upgrades inside the building), those improvements recover over 15 years. QIP is also eligible for bonus depreciation, which effectively compresses that 15-year schedule into a single year.

The classification matters even when you plan to expense everything under Section 179 or bonus depreciation, because the MACRS class determines the depreciation rate for any basis that doesn’t get first-year treatment, and it affects the recapture rules if you dispose of the asset before the recovery period ends.

How does Section 179 expensing work for manufacturers?

Section 179 allows a business to deduct the full purchase price of qualifying equipment and software in the year it is placed in service, rather than depreciating it over multiple years. For 2026, the maximum Section 179 deduction is $2,560,000, and this limit begins phasing out dollar-for-dollar when total qualifying property placed in service during the year exceeds $6,400,000. Both figures are inflation-adjusted annually.

Qualifying property includes tangible personal property (machinery, equipment, furniture, most manufacturing assets), off-the-shelf computer software, and qualified improvement property. The property must be purchased for use in the active conduct of a trade or business, and the deduction cannot exceed the business’s taxable income from active operations (though unused Section 179 deductions carry forward indefinitely).

The taxable income limitation is the constraint most manufacturers need to watch. If your business earns $800,000 of taxable income before depreciation and you place $2 million of equipment in service, Section 179 caps at $800,000 for that year. The remaining basis would then be eligible for bonus depreciation (which has no taxable income limitation), and any leftover after that follows the standard MACRS schedule.

Used equipment qualifies for Section 179 on the same terms as new equipment. This has always been the case. If you buy a used stamping press from another manufacturer, the full purchase price is Section 179 eligible, subject to the dollar and income limitations.

What changed with bonus depreciation under OBBBA?

Before OBBBA, bonus depreciation was on a legislated decline. The Tax Cuts and Jobs Act (TCJA) had set 100% bonus depreciation for assets placed in service from September 27, 2017 through December 31, 2022, after which the rate was scheduled to drop each year until reaching zero by 2027.

OBBBA eliminated that phase-down entirely. The law makes 100% bonus depreciation permanent, applying to eligible property placed in service with no scheduled sunset. For manufacturers who had been timing equipment purchases around the declining schedule, this eliminates the urgency to buy before a deadline. It also simplifies planning: any eligible asset placed in service in 2025, 2026, or any future year gets 100% first-year bonus depreciation.

Bonus depreciation under IRC 168(k) applies to new and used property with a MACRS recovery period of 20 years or less, as well as qualified improvement property, certain computer software, water utility property, and qualified film, television, and live theatrical productions. The used-property eligibility was introduced by TCJA and continues under OBBBA. The only requirement for used property is that the taxpayer hasn’t previously used the asset and the asset wasn’t acquired from a related party.

Unlike Section 179, bonus depreciation has no dollar cap and no taxable income limitation. It can create or increase a net operating loss, which itself carries forward indefinitely under current law (limited to 80% of taxable income in the carryforward year). This makes bonus depreciation the more powerful provision in most cases, though Section 179’s controlled deduction amount and its interaction with state conformity rules give it a distinct planning role.

Section 179 vs bonus depreciation: which goes first?

The ordering rules matter because Section 179 and bonus depreciation serve different strategic purposes. The general sequence works like this:

1. Identify all qualifying property placed in service during the tax year.
2. Elect Section 179 on specific assets where you want to control the deduction amount. Section 179 is elective, meaning you choose which assets to apply it to and how much to deduct (up to each asset’s cost and the overall annual limit).
3. Bonus depreciation applies automatically to the remaining depreciable basis of any eligible asset, unless you elect out of bonus depreciation for one or more classes of property.
4. Regular MACRS depreciation applies to any basis not covered by Section 179 or bonus depreciation.

The reason you might claim Section 179 on certain assets rather than relying entirely on bonus depreciation comes down to state conformity. Many states conform to federal MACRS but either decouple from Section 179 (applying their own, lower limits) or decouple from bonus depreciation entirely. By choosing which provision applies to which asset, you can optimize the federal-versus-state outcome. If your state doesn’t allow bonus depreciation but does follow Section 179, you’d want to push as much as possible through the Section 179 election. Conversely, if your state follows neither, the ordering is primarily a federal concern.

The taxable income limitation on Section 179 also influences the decision. Because bonus depreciation can generate losses and Section 179 cannot (for the current year), you may want to apply Section 179 up to taxable income and let bonus depreciation handle the rest, particularly if the combined deduction exceeds current-year earnings.

Can a manufacturing line be split into components?

Yes. Component depreciation is a legitimate strategy for accelerating deductions on complex manufacturing systems. A production line is rarely a single asset. It typically consists of multiple components with genuinely different useful lives: the structural frame, the conveyor system, the control electronics, the tooling and dies, the safety enclosures, and the software that runs the whole thing.

Each component can be classified and depreciated separately. The tooling might qualify as 3-year or 5-year property. The control electronics and software components may fall into a 5-year class. The conveyor and structural elements land at 7 years. By disaggregating the purchase price across these components (supported by a cost segregation study or the manufacturer’s invoice breakdown), you shift a meaningful percentage of the total cost into shorter recovery periods.

Even with 100% bonus depreciation available, component depreciation still matters in three scenarios. First, if a manufacturer elects out of bonus depreciation for a particular MACRS class (sometimes done for state tax or AMT reasons), the shorter class life accelerates the regular MACRS deduction. Second, for assets placed in service in a short tax year, the convention rules can reduce the first-year deduction, and shorter-lived components recover their basis faster under those rules. Third, if the equipment is later sold or disposed of, the recapture and gain calculations differ by MACRS class, and proper componentization ensures each piece is tracked correctly.

For manufacturers spending significant amounts on integrated production systems, a cost segregation approach applied to the equipment itself (not just the building) can produce meaningful tax benefits, particularly when combined with the Section 179 and bonus depreciation ordering strategy described above.

Does Section 179D help with facility upgrades?

Section 179D is a separate provision from Section 179 (despite the similar numbering). It provides a deduction for energy-efficient improvements to commercial buildings, and it applies to manufacturers who own or lease their production facilities.

The deduction covers three categories of building improvements: interior lighting systems, heating/ventilation/air conditioning (HVAC) and hot water systems, and the building envelope (insulation, windows, doors, roofing). To qualify, the improvement must reduce the building’s total annual energy and power costs by at least 25% compared to a reference standard (ASHRAE 90.1-2007 for most buildings). The deduction amount scales with the energy savings achieved, starting at $2.50 per square foot at the 25% threshold and increasing up to $5.00 per square foot for larger savings, provided prevailing wage and apprenticeship requirements are met.

For a manufacturer operating in a 50,000-square-foot facility, a qualifying HVAC and lighting upgrade could generate a Section 179D deduction of $125,000 to $250,000, on top of whatever depreciation deductions apply to the equipment itself. The 179D deduction is claimed in the year the improvement is placed in service, and it reduces the depreciable basis of the building by the amount of the deduction.

This is particularly relevant for manufacturers undergoing facility modernization. If you’re already investing in new production equipment and the facility needs updated lighting, HVAC, or insulation, the 179D deduction stacks on top of the equipment depreciation benefits. The R&D tax credit may also apply if the facility improvements involve qualifying research activities related to energy efficiency in your manufacturing process.

How does used equipment eligibility work?

Before TCJA, bonus depreciation was limited to new (original-use) property. TCJA expanded eligibility to include used property for the first time, and OBBBA continues that treatment. A manufacturer purchasing a used CNC machine, a secondhand packaging line, or refurbished testing equipment can claim both Section 179 and 100% bonus depreciation on the acquisition cost, subject to three conditions:

The taxpayer must not have previously used the property. If you sell a machine to another company and then buy it back, the repurchased asset does not qualify. The acquisition cannot be from a related party (as defined under IRC 179(d)(2) and IRC 168(k)). And the property must not have been acquired in a transaction where the basis is determined by reference to the transferor’s basis (such as a gift or certain corporate reorganizations).

For growing manufacturers, this is a significant planning opportunity. Used equipment often costs 40% to 60% less than new, and the full acquisition price now gets the same first-year tax treatment as a brand-new machine. Combined with the entity structure considerations that affect how depreciation deductions flow to owners, the decision between new and used equipment is now driven almost entirely by operational factors rather than tax treatment.

What records should manufacturers maintain for depreciation?

Proper documentation protects the deductions on audit. For each asset, maintain the purchase invoice or settlement statement showing the date acquired and total cost, evidence of when the asset was placed in service (not just purchased, but actually ready and available for use), the MACRS class assignment and the basis for that classification, any cost segregation study supporting component depreciation, and the Section 179 election statement filed with the return.

For used equipment, keep records establishing that the property meets the “first use by the taxpayer” requirement and that the seller is not a related party. For Section 179D claims, retain the energy modeling study and certification from a qualified professional.

The UNICAP rules under Section 263A may also interact with your depreciation deductions. If equipment is used to produce inventory, a portion of the depreciation may need to be capitalized into inventory costs rather than deducted directly. This is a common audit issue for manufacturers and worth addressing in the depreciation strategy from the outset.

Related guides

• Manufacturing Tax Deductions and Expenses
• Manufacturing Inventory Accounting and UNICAP (Section 263A)
• Manufacturing R&D Tax Credit (IRC 41)
• Manufacturing Entity Structure: LLC, S Corp, C Corp

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.