Section 179 and your Rivian.

Under the One Big Beautiful Bill Act, the Section 30D new clean vehicle credit, the Section 25E used credit, and the Section 45W commercial credit — the "lease loophole" — all terminated for vehicles acquired after September 30, 2025. There is no federal purchase credit on a Rivian in 2026.

That changes the calculus for business buyers in a way most incentive coverage has not caught up to. The credit was worth up to $7,500 and was a dollar-for-dollar offset. Section 179 plus bonus depreciation is a deduction, not a credit — but on a $92,000 vehicle at a 32% effective tax rate, a full first-year write-off is worth roughly $29,440 in reduced tax.

For a business buyer, the federal picture in 2026 is better than it was in 2025, not worse. That is the opposite of the story everyone else is telling.

For tax years beginning in 2026, the overall Section 179 deduction limit is $2,560,000, phasing out once total qualifying purchases exceed $4,090,000. Those ceilings are far above any single vehicle, so they are not the binding constraint.

The binding constraint is the heavy SUV cap. Vehicles with a GVWR between 6,001 and 14,000 lbs that are primarily designed to carry passengers are capped at $32,000 of Section 179 expensing for 2026. Congress added this cap in 2004 to close what was then called the Hummer loophole.

If Section 179 were the only tool available, a $92,000 R1S would expense $32,000 and depreciate the rest over six years. That is where most write-off advice stops.

The $32,000 ceiling exists inside Section 179 and nowhere else. Bonus depreciation under Section 168(k) is a separate provision with no SUV limit and no luxury-auto cap once the vehicle is rated above 6,000 lbs GVWR.

Bonus depreciation had been phasing down — 80% in 2023, 60% in 2024, and scheduled to drop to 40% in 2025. The One Big Beautiful Bill Act restored it to 100% for qualifying property acquired and placed in service after January 19, 2025, and made it permanent.

The IRS ordering rule: Section 179 first, then bonus depreciation on the remaining basis, then regular MACRS on anything left. That means the SUV cap limits the Section 179 piece — it does not limit your total first-year deduction.

This deserves its own section because the common assumption is wrong, and getting it wrong is expensive.

The instinct is that a pickup escapes the SUV cap. Sometimes it does. The $32,000 cap generally does not apply to vehicles that:

• Seat more than nine passengers behind the driver's seat, or
• Have a cargo area of at least six feet in interior length that is not readily accessible from the passenger compartment, or
• Have a fully enclosed driver compartment with no seating behind the driver and a separate cargo area

The R1T's bed measures 54.2 inches — 4.5 feet — with the tailgate up. It comes in a single cargo bed size, and that is well short of the six-foot threshold.

On a plain reading, that means the R1T does not qualify for the cargo-bed exemption and is subject to the same $32,000 Section 179 cap as the R1S.

Why this matters less than it sounds: because bonus depreciation is at 100% and has no SUV cap, the practical first-year outcome is largely the same either way. The exemption question changes which layer does the work, not the total.

Why you should still ask your CPA: the classification affects how the deduction is reported, and it can matter if bonus depreciation is unavailable to you for other reasons. Do not let a forum post decide this. Bring the door jamb sticker and the bed measurement to your accountant.

If your business use drops to 50% or below in a later year, the IRS can claw back a portion of what you deducted. You recapture the excess of what you deducted over what straight-line depreciation would have produced, and it comes back as ordinary income.

This is the reason to be conservative rather than aggressive. A deduction taken at 80% business use in year one, followed by a job change or a lifestyle shift that drops you to 40% in year three, produces a tax bill you did not plan for.

Ask yourself honestly: will this vehicle still be a majority-business vehicle in five years? If the answer is "probably not," size the deduction accordingly.

The vehicle must be placed in service by the end of your tax year — not ordered, not paid for, not built. In service.

For a calendar-year business, that means the vehicle needs to be delivered and in business use by December 31. Rivian delivery windows can run several weeks to several months depending on configuration and location. If you are planning around a specific tax year, order with meaningful margin.

One important note on leasing: if you lease rather than buy, you do not own the vehicle and cannot take Section 179 or bonus depreciation on it. You deduct the business-use portion of the lease payments instead, subject to a lease inclusion amount. That is a genuinely different calculation, and for a high-basis vehicle with strong business use, buying usually produces the larger first-year deduction. Full comparison on the lease vs. buy guide.

Note on price reductions: the Costco discount lowers your purchase price, which lowers your depreciable basis. That is not a downside — you saved real money — but it means the deduction is calculated on the lower number.