The Section 179 deduction went viral, and business owners everywhere started asking the same question: can you really write off a Mercedes G-Wagon on your taxes? The short version is that you can, if the vehicle is used more than half the time for business and is heavy enough to clear the IRS weight threshold—and thanks to a 2025 tax-law change, you may be able to deduct the full business-use cost in the first year.
What is a G-Wagon?
The Mercedes-Benz G-Wagon, officially the Mercedes-Benz G-Class, is a luxury SUV that has long been a symbol of status and success. Here are a few features that come with it:
Safety and security: The G-Class offers advanced features like collision-prevention systems, stability control, and multiple airbags.
Interior comfort: From heated and ventilated seats to a modern infotainment system, it's built for long drives.
Brand appeal: Mercedes-Benz has a long-standing reputation for premium vehicles that hold their value.
The G-Wagon's appeal comes at a cost: a starting price well north of $140,000. So before you factor in any tax benefit, it has to make sense for your business budget and needs.
Can I write off a G-Wagon as a business expense?
In many cases, yes. Under IRS Section 179, you can write off a G-Wagon as a business expense if it meets two main tests: it's used for business more than 50% of the time, and it has a gross vehicle weight rating (GVWR) above 6,000 pounds. The G-Class clears the weight bar comfortably, which is exactly why it became the poster child for this deduction.
Let's look at how the tax code actually works.
How does the IRS Section 179 tax code work?
The IRS Section 179 deduction lets businesses deduct the full purchase price of qualifying assets in the year they're bought and put into service, rather than depreciating them over several years.
This applies to both new and used assets acquired for business use—machinery, equipment, computers, software, and vehicles. It's meant to encourage businesses to invest in these assets by giving them an immediate tax benefit.
A few things to keep in mind if you're using Section 179 in your tax strategy:
Eligible property: Generally applies to property used for business more than half the time—equipment, machinery, vehicles, and computers.
Deduction limit: The maximum deduction changes yearly. For tax year 2025, the maximum Section 179 deduction is $2,500,000, with a phase-out threshold of $4,000,000; for 2026 those rise to $2,560,000 and $4,090,000 (IRS Rev. Proc. 2025-32). The 2025 One Big Beautiful Bill Act raised these caps well above prior-law levels. The deduction also can't exceed your taxable business income for the year.
Used and new property: Applies to both, as long as it meets the eligibility criteria.
Business income requirement: The deduction can't create or increase an overall tax loss, but any disallowed amount can be carried forward to future years.
IRS forms: To claim it, file IRS Form 4562, "Depreciation and Amortization."
Not all assets qualify, and the rules are specific. Consult a CPA or refer to IRS guidance to confirm eligibility. The bottom line: a G-Wagon can fall under "eligible property" as long as it's used as a business vehicle.
How much does a G-Wagon weigh, and why does it matter for taxes?
The weight is the whole reason a G-Wagon qualifies. Section 179's most generous vehicle rules apply to SUVs with a gross vehicle weight rating (GVWR) of more than 6,000 pounds and not more than 14,000 pounds—the "heavy SUV" category. Vehicles under 6,000 pounds are treated as passenger autos and hit much lower annual deduction caps.
The Mercedes-Benz G-Class has a GVWR of roughly 7,055 pounds (Kelley Blue Book), comfortably above the 6,000-pound line. You can find a vehicle's GVWR on the sticker inside the driver's-side door jamb or in the owner's manual—it's the loaded weight rating, not the curb weight, so it's higher than the number most people picture.
How much of a G-Wagon can you write off in the first year?
For a heavy SUV like the G-Wagon, Section 179 first-year expensing is capped—$31,300 for vehicles placed in service in 2025 and $32,000 in 2026 (IRS Rev. Proc. 2025-32). On its own, that cap would limit your first-year deduction well below the vehicle's price.
Bonus depreciation is what closes the gap. The 2025 One Big Beautiful Bill Act restored 100% bonus depreciation—and made it permanent—for qualifying property acquired and placed in service after January 19, 2025 (BDO). After applying the Section 179 cap, you can apply 100% bonus depreciation to the remaining business-use cost, which can bring the total first-year deduction up to the full business-use portion of the vehicle.
Two caveats matter. Every figure is prorated by business-use percentage—80% business use means 80% of the cost is deductible, not 100%. And the vehicle must be used more than 50% for business to use these accelerated methods at all.
So what counts as a business vehicle?
The IRS uses a few guidelines to decide which vehicles qualify for deductions:
More than 50% business use: A vehicle generally counts as a business vehicle if it's used more than 50% of the time for business. Commuting from home to a regular workplace is personal use; travel between business locations or to meet clients is business use.
Transporting goods or people: A vehicle used to move goods, equipment, or passengers for business typically qualifies.
Weight requirements: For the heavy-SUV rules, the vehicle must have a GVWR above 6,000 pounds (and no more than 14,000 pounds). This is the threshold the G-Wagon clears—and the reason it comes up so often in Section 179 conversations.
Specialized vehicles: Vehicles designed and used for specific business purposes—construction trucks, ambulances, food trucks—can also qualify, sometimes with additional deductions.
If a vehicle is used for both personal and business purposes, the deductible expenses are allocated proportionally to the business-use percentage.
How do you write off a G-Wagon or Mercedes Benz?
Writing off a G-Wagon means deducting the expenses of using the vehicle for business, in line with current tax law. General steps to consider:
Confirm it qualifies for Section 179. In the U.S., Section 179 allows immediate expensing of qualifying vehicles. The G-Class must be used for business more than 50% of the time.
Use it for business. Keep accurate records of the business-use percentage—it determines the deductible portion of every expense.
Keep detailed records. Track all vehicle expenses (fuel, maintenance, insurance) and keep a mileage log with the purpose, start/end mileage, and date of each trip. Don't forget to keep your receipts, too.
Know the recapture rule. If your business use later drops to 50% or below during the recovery period, the IRS recaptures the excess accelerated deductions as ordinary income (IRS Pub 946). In plain terms: if you claim the big first-year write-off and then stop using the vehicle mostly for business, you can owe some of it back.
Consult a tax professional. Vehicle rules are complex and change yearly. A CPA can apply the latest rules to your situation and help you claim the deduction correctly.
The bottom line
A G-Wagon can be a legitimate Section 179 write-off when it's genuinely a business vehicle used more than half the time for business. The weight qualifies it, the 2025 rules make the first-year deduction unusually large, and accurate records are what make the whole thing hold up. As always, a little effort at tracking goes a long way at tax time.
Stay on the money with Relay
Claiming a vehicle deduction lives or dies on your records—the business-use percentage, the mileage log, and every fuel and maintenance receipt. Relay is an online banking and money management platform built for small businesses, with up to 20 checking accounts and no monthly maintenance fees, so you can run vehicle and equipment spending through a dedicated account and keep it cleanly separated from everything else. Open a Relay account to keep your business expenses organized before tax time.
Frequently asked questions
Is a G-Wagon a tax write-off?
It can be. If a G-Wagon is used more than 50% of the time for business, it qualifies for the Section 179 deduction because its gross vehicle weight rating exceeds 6,000 pounds. It has to be a genuine business vehicle, not a personal car you occasionally use for work.
Why is a G-Wagon considered a tax loophole?
It isn't a loophole so much as a heavy-vehicle rule working as intended. Section 179's most generous vehicle deductions apply to SUVs over 6,000 pounds GVWR, a category meant for work trucks and vans. The G-Wagon happens to be heavy enough to qualify while also being a luxury vehicle, which is why it draws attention.
How much does a vehicle have to weigh to be a Section 179 write-off?
For the heavy-SUV rules, the vehicle needs a gross vehicle weight rating (GVWR) above 6,000 pounds and no more than 14,000 pounds. GVWR is the loaded weight rating on the driver's-side door jamb sticker, not the curb weight.
How much of a G-Wagon can you deduct in 2026?
For 2026, the Section 179 first-year cap on a heavy SUV is $32,000, and 100% bonus depreciation can be applied to the remaining business-use cost—potentially bringing the first-year deduction up to the full business-use portion of the vehicle. Everything is prorated by business-use percentage, so confirm the numbers with a CPA.
