6,000 lb. Vehicle Tax Deduction: Section 179 and Bonus Rules

If your business purchases a vehicle with a gross vehicle weight rating (GVWR) above 6,000 pounds, you may qualify for a significantly larger first-year tax deduction than you would with a standard passenger car. This strategy, often called the "6,000 lb vehicle tax deduction," combines Section 179 expensing with bonus depreciation to help business owners write off most or all of a qualifying vehicle's cost in the year it is placed in service.

Below, we break down how the deduction works in 2025 and 2026, which vehicles qualify, the rules around Section 179 and bonus depreciation limits, and how small businesses in Arizona can take full advantage for tax planning purposes.

What Is the 6,000 lb. Vehicle Tax Deduction?

The IRS imposes annual depreciation caps on "passenger automobiles" under Section 280F of the Internal Revenue Code. These caps significantly limit how much you can deduct each year for lighter cars and crossovers. However, vehicles with a GVWR exceeding 6,000 pounds are generally exempt from the tightest 280F limits, making them eligible for much larger write-offs.

The deduction is not a single provision. It is the combined effect of two tax tools:

• Section 179 expensing: allows you to write off the purchase price of qualifying business equipment and vehicles immediately rather than depreciating them over multiple years.
• Bonus depreciation: under the One Big Beautiful Bill Act (OBBBA), 100% bonus depreciation is now permanent for qualified property acquired after January 19, 2025. This means you can deduct the full remaining cost of a vehicle after any Section 179 amount.

Section 179 and Bonus Depreciation Limits by Vehicle Category

The size of your deduction depends on the vehicle's GVWR and how it is classified. Here is how the IRS breaks it down for tax years 2025 and 2026:

Light Vehicles (Under 6,000 lbs. GVWR)

Most sedans, compact SUVs, and small crossovers fall into this category. These vehicles are subject to the strict Section 280F depreciation caps. For 2025, the first-year limit is $20,200 (with bonus depreciation) or $12,200 (without). The total deduction over the vehicle's recovery period is spread across multiple years.

Heavy SUVs (6,000 to 14,000 lbs. GVWR)

SUVs and crossovers with a GVWR above 6,000 pounds but no more than 14,000 pounds qualify for a higher Section 179 deduction, but they are subject to a special SUV cap. For tax year 2025, the Section 179 SUV cap is $31,300. For tax year 2026, it increases to $32,000. After the Section 179 amount, 100% bonus depreciation applies to the remaining depreciable basis, so the full cost of the vehicle can still be written off in year one.

Heavy Trucks, Vans, and Vehicles Over 14,000 lbs. GVWR

Pickup trucks with a cargo bed at least six feet long, cargo vans with a fully enclosed driver compartment, and any vehicle exceeding 14,000 lbs. GVWR are not subject to the SUV cap. These heavy truck and van categories can be fully deducted under Section 179 up to the total Section 179 limit ($2,500,000 for 2025, $2,560,000 for 2026), plus 100% bonus depreciation on any excess. Many businesses that need a Ford Super Duty, RAM 2500, or similar work truck fall into this category.

How GVWR Works (and Common Misconceptions)

The IRS determines vehicle classification based on the Gross Vehicle Weight Rating (GVWR), which is the maximum operating weight assigned by the manufacturer. You can find your vehicle's GVWR on the certification label inside the driver's side door jamb or in the owner's manual.

A common misconception is that you can modify a car or SUV (for example, by adding a tow package or aftermarket accessories) to push it past the 6,000-pound threshold. This does not work. GVWR is a manufacturer specification set at the factory, and the rules require using the manufacturer's rating, not the actual loaded weight or curb weight. Before purchasing, always verify the GVWR for the specific make, model, and trim level. Some trims of the same model may exceed 6,000 lbs. while others do not.

Examples of Vehicles That Qualify

Many popular SUVs, trucks, and vans meet the 6,000 lb. GVWR threshold. Examples include:

• Full-size SUVs: Chevrolet Tahoe, GMC Yukon, Ford Expedition, Toyota Sequoia, Cadillac Escalade
• Midsize and luxury SUVs: BMW X5, Mercedes-Benz GLE, Audi Q7, Jeep Grand Cherokee L, Land Rover Defender
• Pickup trucks: Ford F-150, Chevrolet Silverado 1500, RAM 1500, Toyota Tundra, GMC Sierra
• Cargo and passenger vans: Ford Transit, Mercedes-Benz Sprinter, Chevrolet Express

Always check the exact GVWR for the trim you are purchasing. A base model may fall under 6,000 lbs. while a higher trim with a towing package may exceed it.

Requirements to Claim the Deduction

To qualify for the 6,000 lb. vehicle tax deduction, your vehicle must meet all of the following conditions:

• Business use exceeds 50%: the vehicle must be used more than half the time for qualified business purposes. If business use is 70%, you can deduct 70% of the allowable amount. Keep a written mileage log to substantiate the business-use percentage.
• Placed in service during the tax year: the vehicle must be purchased and placed in service by December 31 of the tax year you are claiming the deduction. For tax year 2026, the deadline is December 31, 2026.
• New or used: both new and pre-owned vehicles qualify, as long as the used vehicle is "new to you" (you have not previously used it).
• Not for personal transport hire: vehicles used primarily to transport passengers for compensation (such as taxis or rideshare) are classified differently and may not qualify for the same deduction limits.

The deduction is claimed on IRS Form 4562 (Depreciation and Amortization) filed with your business tax return.

How OBBBA Changed Vehicle Depreciation

Before the One Big Beautiful Bill Act was signed on July 4, 2025, bonus depreciation was scheduled to phase down from 100% (in 2022) to 80%, 60%, 40%, and eventually 20%. The OBBBA eliminated that phase-down entirely. For any qualifying vehicle acquired after January 19, 2025, 100% bonus depreciation is now permanent.

This means business owners purchasing heavy vehicles in 2025 or later can deduct the full cost in year one without worrying about reduced bonus percentages in future years. Vehicles acquired before January 20, 2025, still follow the old phase-down schedule (40% for 2025, 20% for 2026).

Tracking Vehicle Expenses Beyond the Deduction

If you use the actual expense method to deduct vehicle costs, make sure you are capturing all deductible expenses in addition to depreciation:

• Fuel and oil
• Insurance premiums
• Maintenance and repairs
• Registration fees and taxes
• Lease payments (if leasing rather than purchasing)
• Parking and tolls related to business use

Alternatively, you may use the IRS standard mileage rate (70 cents per mile for 2025). However, if you claim Section 179 or bonus depreciation in the first year, you must continue using the actual expense method for that vehicle in all subsequent years. You cannot switch to the mileage rate later.

Arizona Considerations for Business Vehicle Deductions

Arizona business owners benefit from the state's 2.5% flat income tax rate, which means the federal vehicle deduction flows through to reduce your Arizona adjusted gross income as well. A few Arizona-specific points to keep in mind:

• Vehicle registration: Arizona's Motor Vehicle Division (MVD) bases registration fees on the vehicle's value and weight class. A heavier vehicle may have slightly higher annual registration fees, but these are deductible as a business expense.
• Vehicle license tax (VLT): Arizona charges a VLT based on the assessed value of the vehicle, which declines each year. The VLT is deductible as a personal property tax on your federal return if you itemize, or as a business expense if the vehicle is used for business.
• Transaction Privilege Tax (TPT): when you purchase a vehicle in Arizona, you pay TPT (sales tax equivalent). The TPT paid on a business vehicle can be included in the vehicle's depreciable basis for Section 179 and bonus depreciation purposes.

Frequently Asked Questions

What is the difference between GVWR and curb weight?

Curb weight is the actual weight of the vehicle with standard equipment and fluids but without passengers or cargo. GVWR is the maximum allowable operating weight set by the manufacturer, including the vehicle, passengers, cargo, and accessories. The IRS uses GVWR, not curb weight, to determine whether a vehicle exceeds the 6,000-pound threshold.

Can I add accessories to push my vehicle over 6,000 lbs.?

No. The GVWR is a fixed manufacturer specification and cannot be changed by adding aftermarket parts. If your vehicle's GVWR is below 6,000 lbs., no modification will change that for IRS purposes.

What if I use the vehicle for both business and personal purposes?

You can still claim the deduction, but only the business-use percentage is deductible. For example, if your $60,000 SUV is used 75% for business, you can deduct 75% of the eligible amount. If business use drops to 50% or below in a subsequent year, you may have to recapture part of the deduction.

Is a leased vehicle eligible for Section 179?

No. Section 179 applies only to purchased vehicles. However, lease payments on a business vehicle are deductible as a business expense, subject to inclusion amount adjustments for luxury vehicles.

Do I need to buy the vehicle before year-end?

The vehicle must be both purchased and placed in service (meaning ready and available for use in your business) by December 31 of the tax year. Simply signing a purchase agreement is not enough if the vehicle is not delivered and in use by that date.

How K&R Taxes Can Help

Choosing the right vehicle and structuring the purchase correctly can save your business tens of thousands of dollars in tax savings. At K&R Taxes, our strategic tax advisory team helps small businesses and self-employed professionals evaluate whether a heavy vehicle purchase makes sense, calculate the optimal split between Section 179 and bonus depreciation, review financing options from a tax planning perspective, and ensure proper documentation to withstand an audit.

If you are considering a vehicle purchase for your business, or want to make sure you are maximizing your current deductions, contact us to schedule a consultation. We also assist with business accounting, Section 179 planning for all types of business equipment, and year-end tax planning strategies.