Section 179 and Bonus Depreciation for Trades Equipment: Trucks, Tools, and Heavy Equipment

A plumbing, electrical, or HVAC business can deduct the full cost of nearly every piece of equipment it buys, in the year it’s placed in service, using Section 179 expensing, 100% bonus depreciation, or the de minimis safe harbor for smaller purchases. These aren’t obscure elections; they’re the default way trades equipment gets deducted, and the One Big Beautiful Bill Act made 100% bonus depreciation a permanent feature of the tax code rather than the phasing-down benefit it had become. The practical question for most trades owners isn’t whether they can fully expense equipment; it’s whether doing so in a specific year actually helps, given where the business’s income and tax bracket land.

What equipment actually qualifies?

Both Section 179 and bonus depreciation cover tangible personal property with a MACRS recovery period of 20 years or less, which describes essentially everything a trades business buys: service trucks and vans, diagnostic and testing equipment, power tools and specialty equipment like pipe threaders and recovery units, shop and yard equipment, and purchased software and devices used for dispatch and invoicing.

• Service trucks and vans. Covered in full detail in the dedicated vehicle guide below; the short version is that vehicles over 6,000 lbs GVWR escape the passenger-auto depreciation caps entirely and can be fully expensed.
• Diagnostic and testing equipment. Combustion analyzers, refrigerant leak detectors, sewer inspection cameras, multimeters, insulation resistance testers, and similar equipment.
• Power tools and specialty equipment. Pipe threaders and benders, conduit benders, rebar cutters, portable generators, air compressors, and HVAC recovery and recharge units.
• Shop and yard equipment. Storage racking, workbenches, and (for a business with a fixed shop location) shop tools that don’t leave the premises.
• Software and technology. Field-service management software licenses (if purchased rather than subscribed to monthly), tablets and mobile devices used for dispatch and invoicing, and diagnostic software licenses tied to specific equipment.

How does the de minimis safe harbor work for everyday tools?

The de minimis safe harbor under Reg. 1.263(a)-1(f) lets a business immediately expense tangible property costing $2,500 or less per item or per invoice line (the threshold is $5,000 for businesses with an audited financial statement, which is rare for a small trades business), without capitalizing it as a fixed asset or filing a depreciation election at all.

• This is the right tool for hand tools, smaller power tools, and routine equipment replacement. A $180 impact driver, a $600 multimeter, a $1,200 wet/dry vacuum: all expensed immediately as a supply or small-tools expense, no depreciation schedule needed.
• The safe harbor requires a written accounting policy in place at the start of the tax year, stating the business’s election to apply the de minimis threshold. For a business without an audited financial statement, the policy simply needs to be in place and consistently applied; it doesn’t need to be filed with the IRS, but it should exist in writing and be followed consistently, since an inconsistent practice undermines the safe harbor if challenged.
• A single truckload of replacement tools that totals $18,000 but consists of individually priced items under $2,500 each still qualifies for the safe harbor treatment item by item; the safe harbor threshold applies per item or per invoice line, not to the total invoice.

How does Section 179 work, and where does it help most?

IRC 179 lets a business elect to expense qualifying property immediately rather than depreciate it over its MACRS life. For 2026, the maximum deduction is $2,560,000, phasing out dollar-for-dollar once total qualifying purchases for the year exceed $4,090,000 (a level almost no single-trade business will approach). The election is made asset by asset on Form 4562.

• The deduction cannot exceed the business’s taxable income from active trades or businesses for the year. A trades business that nets $90,000 before equipment purchases and buys $150,000 in qualifying equipment can only take a $90,000 Section 179 deduction; the remaining $60,000 either goes to bonus depreciation (no income limitation) or carries forward as unused Section 179.
• Section 179 matters most in states that don’t conform to federal bonus depreciation. Several states allow Section 179 (sometimes at a lower state-specific dollar limit) while disallowing bonus depreciation entirely, meaning the same $80,000 truck produces a state deduction if expensed under Section 179 but not if expensed entirely under bonus depreciation.
• Section 179 also matters for S-corp shareholders whose stock basis limits the deduction. The deduction passes through to the shareholder level and is subject to basis, at-risk, and passive-activity limitations there, which can matter for an owner with limited basis in the business.

How does bonus depreciation work, and why cover the rest?

IRC 168(k) allows a 100% first-year depreciation deduction, made permanent for property acquired and placed in service after January 19, 2025 by the One Big Beautiful Bill Act (signed July 4, 2025), reversing the phase-down (80% for 2023, 60% for 2024, 40% scheduled for 2025 under the prior law) that had been chipping away at the benefit.

• No dollar cap, unlike Section 179. A trades business that buys $600,000 in trucks and equipment in one year can deduct the full amount under bonus depreciation with no ceiling tied to the total.
• No taxable income limitation. Bonus depreciation can push the business into a net operating loss, which Section 179 cannot do.
• Applies automatically unless the business elects out, by property class (all 5-year property, for instance), not asset by asset, which means a business generally doesn’t need to do anything special to get the benefit.
• Used equipment qualifies, not just new. A used excavator, service truck, or piece of shop equipment bought at auction or from another contractor qualifies for bonus depreciation as long as the buyer hasn’t previously used that specific piece of property and it isn’t acquired from a related party.

Section 179 vs. bonus depreciation at a glance

Factor	Section 179	Bonus depreciation
2026 dollar cap	$2,560,000, phasing out above $4,090,000	No dollar cap
Taxable income limitation	Yes, capped at business taxable income	No, can create a net operating loss
Election method	Asset by asset on Form 4562	Automatic unless elected out by property class
Best fit	States that don’t conform to bonus depreciation; S-corp basis planning	Large purchases, loss years, used equipment
Used property	Qualifies	Qualifies

When should I actually time a big equipment purchase?

Full expensing being available doesn’t mean it’s always the right year to use it. The timing decision usually comes down to four questions: whether this is a high-income or a low-income year, whether the business genuinely needs the equipment now or is buying purely for the deduction, whether next year’s income will be higher or lower, and how the purchase is being financed.

• Is this a high-income year or a low one? A trades business having its best year ever gets the most tax value from a full deduction, since it offsets income taxed at the business’s highest marginal rate for the year. Buying the same truck in a slow year produces a smaller tax benefit per dollar deducted, and may push the business toward a loss that can’t be used as efficiently.
• Does the business actually need the equipment now, or is the purchase being driven by the tax deduction alone? Buying equipment purely to generate a deduction, without a genuine operational need, is a common and expensive mistake; the deduction saves maybe 30 to 35 cents on the dollar, meaning the business still spends the other 65 to 70 cents in real cash for equipment it may not need yet.
• Will next year’s income be higher or lower? A business expecting a much bigger year next year might hold off on Section 179-eligible purchases (where the taxable-income limitation could otherwise waste part of the deduction this year) in favor of waiting, or lean on bonus depreciation this year since it has no such limitation.
• What does financing look like? Buying equipment on credit doesn’t change the depreciation deduction, which is based on the full purchase price regardless of how much cash changed hands versus how much is financed. A business can fully expense a $70,000 truck the same year it’s purchased even if only $10,000 was paid in cash and the rest is financed over five years, which is exactly why equipment financing paired with full expensing is a common cash-flow strategy in the trades.

What about listed property rules for vehicles?

Vehicles fall under the listed property rules in IRC 280F, which is why business-use percentage and contemporaneous mileage logs matter even when a vehicle otherwise qualifies for full first-year expensing. A truck expensed in full under bonus depreciation but used only 60% for business only supports a deduction on that 60%, and a later drop below 50% business use can trigger recapture of the excess depreciation as ordinary income.

What should I do next?

Before the next equipment purchase, confirm the vehicle or equipment’s classification (GVWR for vehicles, MACRS class for other property) and run the numbers on whether this year or next makes better use of the deduction given where taxable income is landing. Keep a simple fixed-asset log even for fully expensed equipment (description, cost, date placed in service, business-use percentage) so a future sale or trade-in doesn’t require reconstructing basis from scratch.

• Work vehicle tax deductions for tradespeople, the full vehicle-specific depreciation mechanics including the GVWR exception
• Tax deductions for plumbers, electricians, and HVAC technicians, how equipment deductions fit into the broader deduction picture
• Estimated taxes for self-employed tradespeople, how a large equipment deduction affects quarterly estimate calculations
• Construction equipment Section 179 and bonus depreciation, the same framework applied to heavier construction equipment and MACRS recovery periods

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