If you're buying a truck for business, the truck tax write-off rules are some of the most favorable in the entire tax code. Trucks over 6,000 lbs GVWR bypass the luxury vehicle caps that limit deductions on cars and light SUVs — meaning you can potentially deduct the entire purchase price in year one. Here's exactly how it works, with real numbers on specific trucks.
Section 179 for Trucks Over 6,000 lbs
The Section 179 deduction allows businesses to deduct the full purchase price of qualifying equipment — including vehicles — in the year it's placed in service. For 2026, the deduction limit is $1.25 million.
The critical detail: vehicles under 6,000 lbs GVWR face a luxury vehicle cap that limits the first-year deduction (around $20,400 for cars in 2026). But vehicles over 6,000 lbs GVWR are classified as "heavy" and have no such cap. A $90,000 truck can be fully deducted; a $45,000 sedan cannot.
To qualify, the truck must be used more than 50% for business. If business use is 100%, you deduct 100% of the cost. If business use is 75%, you deduct 75%. Keep a mileage log to document the split.
The 6,000 lb GVWR threshold is based on the manufacturer's Gross Vehicle Weight Rating — not the truck's actual curb weight. Check the sticker inside the driver's door jamb or the manufacturer specs. Most full-size pickups (F-250+, Ram 2500+, Silverado 2500+) and all semi trucks easily exceed this threshold.
Bonus Depreciation on Trucks
Bonus depreciation is the second mechanism for first-year truck write-offs. In 2026, bonus depreciation is 100% for qualifying assets (after the 2025 extension). Unlike Section 179, bonus depreciation has no dollar cap and can create a net operating loss (Section 179 cannot reduce income below zero).
Key difference: Section 179 requires the business to have enough taxable income to absorb the deduction. Bonus depreciation doesn't — which matters for fleet operators making large purchases that exceed their current-year income.
Both new and used trucks qualify for bonus depreciation, as long as the truck is "new to you" (you haven't used it before). A used Peterbilt from a dealer qualifies. A truck you already own does not.
Real Examples: Truck Tax Write-Off by Vehicle
Example 1: $85,000 Peterbilt 579
An owner-operator purchases a used 2023 Peterbilt 579 for $85,000 in March 2026. The truck is used 100% for business. Under Section 179, the full $85,000 is deductible in 2026. At a 32% combined federal/state tax rate, that's $27,200 in tax savings from a single purchase.
If the operator financed the truck with a $15,000 down payment and 60-month loan, they still deduct the full $85,000 in year one — not just the down payment. The tax savings often exceed the down payment itself.
Example 2: $60,000 Ford F-350
A construction contractor buys a new 2026 Ford F-350 for $60,000. GVWR is 11,500 lbs — well above the 6,000 lb threshold. Used 90% for business (10% personal trips). The deduction is $54,000 ($60,000 x 90%). At a 35% tax rate, the savings are $18,900.
Example 3: $45,000 Ram 2500
A landscaping business owner buys a used Ram 2500 for $45,000. GVWR is 10,000 lbs. 100% business use. Full $45,000 deduction in year one under Section 179. At a 24% tax bracket, that's $10,800 saved.
Buying vs. Leasing: Tax Impact
| Factor | Buying (Loan) | Leasing |
|---|---|---|
| Year-one deduction | Full price via Section 179 / bonus depreciation | Only lease payments made that year |
| Total deduction over life | Full purchase price (front-loaded) | Total lease payments (spread out) |
| Ownership at end | You own the truck | Return or buy out |
| Best for | High-income years, need big deduction now | Steady income, prefer predictable payments |
| Cash flow impact | Larger upfront cost | Lower monthly outlay |
For most truck buyers, purchasing beats leasing from a tax perspective because Section 179 and bonus depreciation let you front-load the entire deduction. A $85,000 truck purchased in December still qualifies for the full write-off that tax year. Leasing spreads the deduction over the lease term, which means smaller annual deductions.
The exception: if you don't have enough income to absorb a large Section 179 deduction this year, leasing lets you match the deduction to your actual cash flow and income pattern.
Timing Your Purchase
Section 179 and bonus depreciation only require the truck to be "placed in service" during the tax year — meaning it's ready and available for use. You don't need to have driven it for months. A truck purchased and placed in service on December 30 qualifies for the full year's deduction.
This makes Q4 the most strategic time to buy a truck if you're looking to reduce your current-year tax bill. Know your projected income by October, consult with your tax strategist, and time the purchase to maximize the deduction impact.
Fleet Owners: Multiple Vehicle Purchases
Fleet operators buying multiple trucks in a single year can stack Section 179 deductions — up to the $1.25 million annual limit. Beyond that, bonus depreciation picks up the rest with no cap. A fleet owner purchasing five trucks at $80,000 each ($400,000 total) deducts the full $400,000 in year one.
The phase-out threshold for Section 179 in 2026 is $3.13 million in total equipment purchases. If your fleet investments exceed that amount, the Section 179 deduction starts to phase out dollar-for-dollar — but bonus depreciation still applies to everything above it.
Planning a truck purchase? The timing, financing structure, and entity setup all affect how much you save. We'll model the exact tax impact before you sign the paperwork.
Get a Purchase Tax Analysis →Don't Forget the Ongoing Deductions
The write-off on the truck itself is just the beginning. Once you're operating, every associated cost is also deductible: fuel, maintenance, insurance, tires, per diem meals, parking, and tolls. For owner-operators, the total annual deduction from truck ownership and operation often exceeds $100,000 — making trucking one of the most tax-efficient industries for business owners who track everything.