Section 179 vs Bonus Depreciation for Your Next Service Truck

You just spent $72,000 on a new 2026 Ford F-250 with a custom utility body and heavy-duty shelving. It’s sitting in your lot, ready to start running calls, and your first thought isn't about the fuel economy—it’s about how much of that check you can claw back from the IRS. For the last few years, the answer was easy: you just took 100% bonus depreciation and wiped the whole cost off your taxable income in year one.

Everything is changing in 2026. Under the current schedule established by the Tax Cuts and Jobs Act, bonus depreciation is sunsetting. It dropped to 40% on January 1, 2026. If you’re used to that 'set it and forget it' instant write-off, you’re about to get a rude awakening when you see your tax bill next April.

For a plumbing, HVAC, or electrical shop with a fleet of five or twenty trucks, navigating the gap between Section 179 and the shrinking bonus depreciation isn't just an accounting exercise. It’s a cash flow strategy. If you choose wrong, you end up overpaying the IRS today while losing the ability to offset income tomorrow.

The Survival of Section 179

While bonus depreciation is slowly dying, Section 179 remains the workhorse for trade businesses. Unlike bonus depreciation, which is a percentage of the purchase price, Section 179 allows you to deduct a specific dollar amount of equipment and vehicle purchases—up to a limit.

For 2026, those limits are inflation-adjusted. You can generally find the current thresholds on the IRS Electing to Expense Certain Depreciable Assets page. The beauty of Section 179 is its flexibility. You don't have to take it all at once. If your 12-person plumbing shop had a mediocre Q3 but expects a massive Q4, you can cherry-pick how much of that $72,000 truck cost you want to expense now versus what you want to depreciate over the next five years.

There is a catch that catches many solo plumbers: the business income limit. You cannot use Section 179 to create a loss. If your business only cleared $50,000 in profit and you bought a $70,000 truck, you can only write off $50,000 under Section 179. The rest has to be carried over. Bonus depreciation, however, doesn't have that same 'profit only' shackle, which is why the two are often used in tandem.

Bonus Depreciation’s Slow Fade

In 2023, you got 80%. In 2024, it was 60%. Now, in 2026, we are down to 40%. This is the 'phase-out' period. If you buy a service van for $50,000 today, bonus depreciation only lets you take $20,000 off the top.

So why use it at all? Because it applies after you’ve hit your Section 179 plateaus or if you are trying to create a Net Operating Loss (NOL) to carry back or forward. In a year where you’ve invested heavily in a new warehouse or a massive inventory of water heaters and copper pipe, bonus depreciation can still provide a bit of extra cushioning when Section 179 hits its ceiling.

Heavy Metal: The GVWR Rule

The IRS doesn’t care about the brand of your truck; it cares about the Gross Vehicle Weight Rating (GVWR). For plumbers and HVAC techs, this is where the money is made.

Vehicles with a GVWR over 6,000 pounds—think a Chevy Silverado 2500 or a Ford Transit with a heavy payload package—are treated differently than a Ford Maverick or a small sedan. If the truck is over 6,000 pounds and has a 'non-personal use' modification, like a permanent wrap, ladder racks, and no rear seats, it typically qualifies for the full Section 179 deduction.

If you’re running a light-duty SUV for sales calls that happens to weigh less than 6,000 pounds, you’re stuck with 'luxury auto' limits. These are significantly lower and can take years to fully depreciate. When you’re at the dealership, look at the sticker inside the driver’s side door. If it says 5,900 lbs, you’re in for a tax headache. If it says 6,001 lbs, you’ve just opened the door to much faster tax recovery.

Planning for the 2026 Trough

If you have a $2 million HVAC shop, your biggest fear isn't just the price of the truck—it's the timing of the tax hit. If you take the full deduction in 2026, you lower your taxes now, but you have zero depreciation left for 2027, 2028, or 2029.

If we see tax rates rise in the coming years, that 'instant' 2026 deduction might actually cost you money in the long run. Every dollar you deduct now at a 21% or 24% tax rate is a dollar you can’t deduct later if rates climb to 28% or 30%.

This is why I often suggest look-back or forward-looking planning with a CPA who understands the MEP (Mechanical, Electrical, Plumbing) space. You might decide to take 40% bonus depreciation and spread the rest over the standard five-year MACRS schedule to ensure you have 'tax shields' in future years when you expect higher profits. You can review the standard recovery periods in IRS Publication 946.

The Used Truck Trap

Beware the 'new-to-you' truck. While Section 179 and bonus depreciation currently apply to used equipment, the rules for used property can be more restrictive. The equipment must be 'new' to your business, but it cannot be acquired from a related party (like buying your brother’s old truck) or through certain types of tax-deferred exchanges.

For a 4-person shop in Ohio buying a refurbished box truck from a dedicated fleet dealer, this usually isn't an issue. But if you’re doing 'handshake' deals for 10-year-old high-mileage vans, the depreciation benefits might be 101-level simple, and Section 179 might not even be worth the paperwork for a $5,000 asset. Save Section 179 for the big-ticket items—the $60,000+ rigs that actually move the needle on your Schedule C or Form 1120-S. Any shop owner should verify their specific eligibility for these deductions on the Small Business Administration's tax page.

Making the Choice

Don't let the tax tail wag the business dog. If you need a truck to keep your technicians on the road and stop paying $400/week in repairs on a dying van, buy the truck. But once you have the VIN, sit down with your books.

If you are in a high-growth phase and need every cent of cash to hire another apprentice, push for the maximum year-one deduction using Section 179. If you are steady, profitable, and worried about future tax hikes, consider a more conservative MACRS approach.

Either way, keep your receipts for the vehicle wraps and the shelving installs. Those are part of the 'basis' of the vehicle and are just as deductible as the engine and the tires. Just make sure the truck is 'placed in service'—meaning it's actually ready for work and on the road—before midnight on December 31, 2026. If it's sitting at the upfitter's shop waiting for a bed, it doesn't count for this tax year.

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📋 Disclaimer

This article is for informational purposes only and does not constitute legal, tax, financial, or professional advice. Laws and regulations change frequently, and the information presented may not reflect the most current legal developments. Always consult with a qualified professional (CPA, attorney, financial advisor) before making business decisions based on this content. MyBizNerd may receive compensation through affiliate links, but this never influences our recommendations.

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