Company-Car Tax Deductions Depend on Business Use

For a passenger car placed in service in 2026, the first-year depreciation cap is $20,300 when bonus depreciation applies.

By Career Ahead AI · United States — AI-assisted, fact-verified against cited sources. Readers should verify key facts.

Business use determines the deductible share

In the example of a $50,000 passenger car used 60% for business, the business basis is $30,000. Applying that business-use share to the first-year cap produces a maximum deduction of $12,180. The figures show how the cap and the business-use calculation work together: the deductible amount is limited by both, rather than being the full purchase price simply because the business owns the vehicle.^¹

The deduction amount follows how much the vehicle was used for business, not who owns it. A trip from home to a regular workplace or business location counts as personal use, even when the vehicle belongs to the business. No deduction method, business entity or vehicle category turns the personal-use share into a deductible expense. The ownership label does not change the distinction between business driving and personal driving.^¹

The IRS standard mileage rate was 72.5 cents per mile for the first half of the year. It increased to 76 cents for miles driven from July 1 through December 31. Those rates apply to miles driven in their respective periods; they do not change the rule that the deduction depends on business use. Commuting to a regular workplace remains personal under that rule, regardless of the vehicle’s owner.^¹

A trip from home to a regular workplace or business location counts as personal use, even when the vehicle belongs to the business.

The depreciation choice affects the mileage method

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Claiming accelerated depreciation, bonus depreciation or Section 179 means the standard mileage method cannot be used for that vehicle afterward. There is also a use threshold for those depreciation options: qualified business use must be more than 50%. A buyer deciding between methods therefore has to consider both the vehicle’s business-use share and whether a depreciation claim forecloses mileage-based deductions for the vehicle.^¹

Section 280F of the Internal Revenue Code caps annual depreciation for passenger cars. The passenger-car caps apply to vehicles up to 6,000 pounds. Passenger-car weight is measured by unloaded weight; for trucks, vans and most SUVs, the measure is gross vehicle weight rating. The category and weight measurement matter because they determine whether the passenger-car cap applies, rather than the vehicle’s business-use share alone.^¹

Bonus depreciation at 100% applies again to property acquired after January 19, 2025. That rule affects which first-year cap applies, but it does not erase the business-use calculation or the passenger-car depreciation limit. In the example above, the maximum deduction reflects the business share of the applicable cap; it is not an automatic deduction of the car’s entire cost.^¹

The applicable cap and records still matter

When bonus depreciation does not apply, the passenger-car cap is reduced to $12,300. After the business-use percentage is applied, the maximum in the example becomes $7,380. This lower cap changes the amount available for the first year, while the business-use share remains part of the calculation. A buyer cannot treat the cap as the final deduction without accounting for how the vehicle was used.^¹

For tax years beginning in the same year, the Section 179 deduction for a heavy sport utility vehicle is limited to $32,000. That limit applies to this vehicle category and deduction; it does not make personal driving deductible. The general requirement that qualified business use exceed 50% also applies to using Section 179. The vehicle’s category, business use and selected deduction method all affect the available claim.^¹

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A mileage log created only after an audit notice arrives is one of the easiest ways to lose a legitimate deduction. That makes the record of business driving part of the claim itself, not merely a document to assemble later. For someone buying through a business, the practical test is whether the business-use share can be supported by a contemporaneous log and whether the chosen deduction method matches the vehicle’s use.^¹

That rule affects which first-year cap applies, but it does not erase the business-use calculation or the passenger-car depreciation limit.

Track Business Miles Before You Buy

If you are buying a car through a business, the deduction you can claim depends on how much you actually drive it for work, not on who owns it. Commuting from home to a regular workplace always counts as personal use, so a vehicle used mostly for that trip yields a much smaller write-off. Before choosing a car, estimate your business-use share and keep a contemporaneous log, because a log created only after an audit notice arrives can cost you the entire deduction.^¹

Your choice of depreciation method changes what you can claim. If you use bonus depreciation or Section 179, you cannot switch to the standard mileage method later, and you need qualified business use above 50%. For a $50,000 car used 60% for business, the first-year deduction caps at $12,180 with bonus depreciation, but falls to $7,380 without it. Ask your accountant to model both scenarios before you commit to a vehicle.^¹