How Much Can Your Corporation Write Off in Year One?
Section 179 lets corporations immediately expense qualifying business property instead of depreciating it over several years, but vehicles come with special limits. For 2025, the overall Section 179 cap is $1,250,000, reduced dollar-for-dollar once total qualifying purchases for the year exceed $3,130,000. On top of that, heavy SUVs and trucks over 6,000 lbs GVWR are capped around $31,300, while passenger cars face a much lower luxury-auto limit near $20,400. This calculator applies your business-use percentage, checks your vehicle type's specific cap, and factors in any other Section 179 property you've already placed in service this year to estimate your actual deduction — then compares the resulting tax savings to what you'd get from simply leasing the same vehicle and expensing the payments.
How It's Calculated
| Step | Item | Formula |
|---|---|---|
| 1 | Business-use cost | Price × business-use % |
| 2 | Vehicle Section 179 cap | SUV ~$31,300 / Car ~$20,400 |
| 3 | Overall limit after phase-out | $1,250,000 − other property − phase-out |
| 4 | Section 179 deduction | min(business-use cost, vehicle cap, overall limit) |
| 5 | First-year tax savings | Deduction × 21% corporate rate |
Vehicle caps and the overall Section 179 limit are updated annually by the IRS, and qualifying for the SUV vs. luxury-auto category depends on exact vehicle specs, so confirm current figures with a tax professional before filing.
Frequently Asked Questions
For 2025, corporations can expense up to $1,250,000 in qualifying property under Section 179, phased out dollar-for-dollar once total qualifying purchases exceed $3,130,000. Vehicles also have their own caps: heavy SUVs and trucks over 6,000 lbs GVWR are limited to about $31,300, while passenger cars are subject to a lower luxury-auto limit, roughly $20,400 for 2025.
The IRS caps Section 179 expensing for SUVs to prevent businesses from writing off luxury vehicles as full business expenses. Trucks and vans with no rear seating and a dedicated cargo area can sometimes bypass the SUV cap entirely — check with a tax professional for your specific vehicle.
It can be, especially for passenger cars where the Section 179 and luxury-auto caps limit your first-year deduction well below the lease payment's full expense treatment. Compare the numbers here, but also weigh cash flow, mileage limits, and long-term ownership value.
※ Actual figures may vary by individual circumstances. This is a reference estimate only.