Buying a vehicle for your business? The tax implications depend almost entirely on one number: gross vehicle weight rating (GVWR). The IRS draws a hard line at 6,000 pounds, and understanding which side your vehicle falls on can mean the difference between a $20,700 deduction and a $116,000+ write-off in year one.
Here's exactly how Section 179 vehicles rules work, which trucks and SUVs qualify for the heavy vehicle deduction, and how to maximize your write-off.
The 6,000-Pound Rule: Why Weight Matters
The IRS classifies vehicles into two categories for depreciation purposes. Vehicles with a GVWR of 6,000 pounds or less are considered "passenger automobiles" and subject to annual depreciation caps (the luxury auto limits). Vehicles over 6,000 pounds are exempt from these caps and eligible for much larger deductions.
GVWR is not the vehicle's curb weight — it's the manufacturer's maximum loaded weight, which includes passengers and cargo. You'll find it on the driver's side door sticker or in the owner's manual. This is the number the IRS uses, period.
Light Vehicles (Under 6,000 lbs): The Luxury Auto Caps
If your business vehicle weighs under 6,000 lbs GVWR, you're subject to the IRS "luxury automobile" depreciation limits. These caps restrict how much you can deduct each year, regardless of the vehicle's actual cost.
| Year | With Bonus Depreciation | Without Bonus Depreciation |
|---|---|---|
| Year 1 | $20,700 | $12,400 |
| Year 2 | $19,500 | $19,500 |
| Year 3 | $11,700 | $11,700 |
| Year 4+ | $6,960/yr | $6,960/yr |
So if you buy a $55,000 sedan or crossover that weighs under 6,000 lbs, your first-year deduction maxes out at $20,700 (with bonus depreciation). The remaining cost gets spread over subsequent years at the capped rates. This applies to most cars, small SUVs, and lighter crossovers.
Heavy Vehicles (Over 6,000 lbs): The Big Deduction
Vehicles over 6,000 lbs GVWR are not subject to the luxury auto caps. This opens the door to much larger deductions — but the rules differ based on vehicle type.
Heavy SUVs (6,001–14,000 lbs GVWR)
SUVs with a GVWR between 6,001 and 14,000 pounds qualify for Section 179, but with a special SUV cap of $30,500 (2026). However, the remaining cost is then eligible for 100% bonus depreciation.
Example: You buy a $78,000 Chevrolet Tahoe (GVWR: 7,100 lbs) and use it 100% for business. Your deductions: $30,500 under Section 179 + $47,500 under bonus depreciation = $78,000 total first-year write-off. The entire vehicle cost is deducted in year one.
Trucks and Vans Over 6,000 lbs (Non-SUV)
Pickup trucks, cargo vans, and other non-SUV vehicles over 6,000 lbs that have a bed length of 6 feet or more (or are designed to seat 9+ passengers behind the driver) are classified differently. These vehicles are not subject to the $30,500 SUV cap — they qualify for the full $1.25 million Section 179 limit.
This means a $95,000 Ford F-250 used 100% for business can be fully expensed under Section 179 alone — no need to layer in bonus depreciation.
Which Vehicles Qualify? Real Examples
| Vehicle | GVWR | Category | Max Year 1 Write-Off |
|---|---|---|---|
| Tesla Model 3 | 4,883 lbs | Light (capped) | $20,700 |
| BMW X5 | 6,063 lbs | Heavy SUV | Full cost (179 + bonus) |
| Chevrolet Tahoe | 7,100 lbs | Heavy SUV | Full cost (179 + bonus) |
| Ford F-150 | 6,010–7,050 lbs | Heavy truck | Full cost (Section 179) |
| Ford F-250 | 10,000 lbs | Heavy truck | Full cost (Section 179) |
| Toyota Land Cruiser | 6,800 lbs | Heavy SUV | Full cost (179 + bonus) |
| Mercedes GLS | 6,945 lbs | Heavy SUV | Full cost (179 + bonus) |
| Jeep Grand Cherokee | 6,500 lbs | Heavy SUV | Full cost (179 + bonus) |
Important: Always verify the specific GVWR for your vehicle's trim and configuration. Some models straddle the 6,000 lb line depending on options. The four-wheel-drive version of a vehicle might cross the threshold while the two-wheel-drive version doesn't.
The Business Use Requirement
Section 179 requires more than 50% business use. If you use a vehicle 70% for business and 30% personally, you can only deduct 70% of the cost. Drop below 50%, and you lose the Section 179 election entirely — and may have to recapture deductions from prior years.
You need to keep a contemporaneous mileage log documenting business vs. personal use. The IRS scrutinizes vehicle deductions more than almost any other category. Apps like MileIQ or a simple spreadsheet work, but you need dates, destinations, business purpose, and miles driven for each trip.
Pro tip: If you want to avoid the mileage log hassle entirely, consider making the vehicle a company-owned asset with no personal use allowed. Pair it with a personal vehicle for non-business driving. This makes the 100% business use claim defensible and simplifies documentation. Discuss this with your tax strategist before purchase.
Timing Your Vehicle Purchase
Unlike many deductions, you don't need to own the vehicle for the full year. A vehicle purchased and placed in service on December 31 qualifies for the same Section 179 deduction as one bought on January 1.
This makes Q4 vehicle purchases a powerful year-end tax planning move — especially if your income came in higher than expected. A business owner who discovers they'll owe an extra $30,000 in taxes can offset much of that by purchasing a qualifying heavy vehicle before year-end.
But don't buy a vehicle just for the tax deduction. The write-off reduces your tax bill — it doesn't eliminate the cost. A $80,000 vehicle with a $30,000 tax savings still costs you $50,000 out of pocket. Only buy what you actually need for the business.
Section 179 Vehicles vs. Actual Expense Method vs. Mileage Rate
When you use Section 179 on a vehicle, you're using the actual expense method. The alternative is the standard mileage rate ($0.70/mile for 2026), which is simpler but almost always results in a smaller deduction for heavy vehicles.
Once you claim Section 179 on a vehicle, you're locked into the actual expense method for that vehicle's lifetime. You can't switch to the mileage rate later. For expensive, heavy-use business vehicles, this is almost always the right call anyway.
Planning a vehicle purchase for your business? We'll help you structure it for the maximum write-off — and make sure your documentation holds up to IRS scrutiny.
Schedule a Free Strategy Call →The Bottom Line
The Section 179 vehicle deduction is one of the most tangible, immediate tax benefits available to business owners. But the rules are nuanced — GVWR thresholds, SUV caps, business use percentages, and the interaction with bonus depreciation all affect your final number.
Before you sign at the dealership, know exactly what you're buying and how it'll be treated on your return. A 15-minute conversation with a tax strategist before purchase can be worth tens of thousands in additional deductions.