A G-Wagon qualifies for a full first-year business write-off because its gross vehicle weight rating tops 6,000 pounds, which pulls it out of the strict annual depreciation caps that apply to lighter luxury cars. With 100% bonus depreciation restored for property placed in service after January 19, 2025, a business owner who uses a G-Wagon more than half the time for work can deduct the entire business-use portion of the purchase price in year one. On a $180,000 G-Wagon used 80% for business, that is a $144,000 first-year deduction. The same money spent on a 5,500-pound luxury sedan would produce a first-year deduction of just $20,300.1Internal Revenue Service. Revenue Procedure 2026-15 The G-Wagon tax write-off is real, but it depends on three things: the vehicle’s weight rating, how you use it, and how you own it.
Why the G-Wagon Qualifies
The IRS defines a “passenger automobile” as a four-wheeled vehicle rated at 6,000 pounds unloaded gross vehicle weight or less. Vehicles above that threshold escape the annual dollar caps on depreciation that Section 280F imposes on lighter cars.1Internal Revenue Service. Revenue Procedure 2026-15
The Mercedes-Benz G 550 and AMG G 63 both carry a GVWR of roughly 7,000 pounds. That rating classifies the G-Wagon as a heavy, non-passenger vehicle for depreciation purposes and removes the annual caps entirely.
The line is all-or-nothing. A vehicle rated at 5,999 pounds is locked into a first-year depreciation cap of $20,300 with bonus depreciation, or $12,300 without it. A vehicle rated at 6,001 pounds has no cap at all. The rating has to come from the manufacturer’s documentation, not from aftermarket modifications or actual weight on a scale. Verify the GVWR on the door jamb sticker or the manufacturer’s spec sheet before assuming any specific vehicle qualifies.
How Much You Can Deduct in Year One
The engine behind the write-off is bonus depreciation. Under the Tax Cuts and Jobs Act of 2017, bonus depreciation was phasing down 20 percentage points a year and headed to zero in 2027. The One Big Beautiful Bill, signed in 2025, reversed the phase-down and made 100% bonus depreciation permanent for qualified property acquired after January 19, 2025.2Internal Revenue Service. Treasury, IRS Issue Guidance on the Additional First Year Depreciation Deduction Amended as Part of the One Big Beautiful Bill
For a G-Wagon placed in service in 2026, that means 100% of the vehicle’s business-use cost basis is deductible in the first year. Bonus depreciation applies to new and used vehicles alike, as long as the vehicle is new to the taxpayer. It has no taxable income limitation, so it can create or increase a net operating loss.
The math for a $180,000 G-Wagon used 80% for business:
- Business-use cost basis: $180,000 × 80% = $144,000
- 100% bonus depreciation: $144,000
- Remaining depreciable basis: $0
The full $144,000 is deductible in year one. Nothing is left to depreciate in later years. The remaining $36,000 tied to personal use is never deductible.
Where Section 179 Fits
Section 179 is a separate deduction that lets a business elect to expense qualifying property in the year it is placed in service. With 100% bonus depreciation back, Section 179 is largely redundant for heavy vehicles, but it has a narrow role.
For SUVs with a GVWR above 6,000 pounds and not more than 14,000 pounds, Section 179 is capped at $32,000 per vehicle for 2026.3Internal Revenue Service. 2025 Instructions for Form 4562 – Depreciation and Amortization The overall Section 179 limit for 2026 is $2,560,000, with a dollar-for-dollar phase-out starting at $4,090,000 of total qualifying property placed in service.
The key difference from bonus depreciation is the taxable income limitation. Section 179 cannot push business income below zero. If your business earns $20,000, you can only deduct $20,000 under Section 179 that year; the rest carries forward indefinitely.4eCFR. 26 CFR 1.179-3 – Carryover of Disallowed Deduction Bonus depreciation, by contrast, can generate a net operating loss.
When both are used, Section 179 reduces the vehicle’s cost basis first, and bonus depreciation applies to the remaining basis.5Internal Revenue Service. Instructions for Form 4562 (2025) With bonus at 100%, the total first-year deduction comes out the same either way. For most G-Wagon buyers, bonus depreciation alone is simpler. Section 179 matters mainly when you want carryforward treatment rather than a net operating loss, or when you need precise control over how much to expense.
The 50% Business-Use Rule
The vehicle must be used more than 50% for qualified business purposes in the year it is placed in service to claim either Section 179 or bonus depreciation.6Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses Drop below that and the vehicle reverts to straight-line depreciation.
Qualified business use covers driving to client meetings, traveling between job sites, and picking up supplies. Commuting between home and your regular office does not count, no matter how far the drive is or whether you take calls on the way. Logos or advertising wraps on the vehicle do not convert personal trips into business trips.
Recordkeeping
The IRS requires contemporaneous records, meaning documentation created at or near the time of each trip, not reconstructed at year-end. A mileage log should record the date, destination, business purpose, and miles driven for every business trip. GPS-enabled tracking apps have become the standard because they capture this automatically and resist after-the-fact editing.
This is where most large vehicle deductions fall apart on audit. The dollar amounts attract attention, and the most common reason they get disallowed is not a legal dispute over vehicle weight or depreciation math. It is a missing or incomplete mileage log.
What Happens if Business Use Drops Later
The 50% rule does not end after year one. If business use falls to 50% or below in any year during the vehicle’s five-year recovery period, you must report the excess depreciation as ordinary income on that year’s return.5Internal Revenue Service. Instructions for Form 4562 (2025) The recapture amount is the difference between what you deducted and what straight-line depreciation would have allowed. On a $144,000 first-year write-off, the recapture can be substantial.
Buying vs. Leasing
Section 179 and bonus depreciation are only available when you own the vehicle. If you lease a G-Wagon, you deduct the business-use portion of your lease payments as an operating expense, but you cannot claim any accelerated depreciation on property you do not own.6Internal Revenue Service. Publication 463 (2025), Travel, Gift, and Car Expenses
Vehicles over 6,000 pounds GVWR are excluded from the passenger automobile definition, so a leased G-Wagon avoids the lease inclusion amount that applies to lighter luxury cars. Even so, the absence of accelerated depreciation makes leasing far less tax-efficient than buying for a vehicle in this price range.
Skip the Standard Mileage Rate
The IRS offers two methods for deducting vehicle expenses: the standard mileage rate (72.5 cents per mile for 2026) and the actual expense method. You cannot combine them, and the choice you make in the first year has lasting consequences.
If you claim actual expenses in the first year (which includes Section 179 or bonus depreciation), you cannot switch to the standard mileage rate for that vehicle in any future year. If you take the standard rate the first year and switch to actual expenses later, you are locked into straight-line depreciation for the rest of the vehicle’s life.7Internal Revenue Service. Topic No. 510, Business Use of Car
For a G-Wagon, taking the standard mileage rate forfeits the entire accelerated depreciation benefit, which is the whole point of buying one through a business.
What You Owe Back When You Sell
Every dollar you deducted through Section 179 or bonus depreciation reduces the vehicle’s adjusted basis. If you sell or trade in the G-Wagon for more than that adjusted basis, the gain is taxed as ordinary income under Section 1245 depreciation recapture, not at capital gains rates.8Internal Revenue Service. Publication 544 (2025), Sales and Other Dispositions of Assets
Suppose you deducted $144,000 on a $180,000 G-Wagon, leaving an adjusted basis of $36,000. Sell it three years later for $100,000 and your gain is $64,000, all of it ordinary income up to the total depreciation previously claimed. You still come out ahead because you took the deduction years earlier and used that cash in the meantime, but the recapture is a real cost. A like-kind exchange under Section 1031 does not apply to vehicles, so trading in for a new G-Wagon does not defer the gain.
How Your Business Structure Changes Things
The mechanics of the deduction vary by entity type.
Sole proprietors claim vehicle depreciation on Schedule C. The Section 179 taxable income limitation is based on total taxable income from all active trades or businesses, including W-2 wages. Bonus depreciation has no income limitation and can create a loss that offsets other income.9eCFR. 26 CFR 1.179-2 – Limitations on Amount Subject to Section 179 Election
S corporations and partnerships face Section 179 limits at both the entity and owner level. The entity cannot allocate more Section 179 than its own taxable income allows, and each owner is further limited by their personal active-business income. When the entity owns the vehicle, depreciation flows through on Schedule K-1.
C corporations claim the deduction directly on the corporate return. The Section 179 taxable income limitation is based on corporate taxable income before the net operating loss deduction and special deductions.
If you personally own a G-Wagon but use it for an S corporation’s business, be careful. Misaligning vehicle ownership and business use is a common setup that creates audit risk if the documentation does not clearly tie the vehicle to the entity’s operations.