Generally, you cannot deduct the interest paid on a car loan for personal use. The Tax Cuts and Jobs Act of 2017 suspended the deduction for personal interest, which includes interest on car loans used for personal transportation. However, there is a significant exception: if you use the car for business purposes, you may be able to write off a portion of the loan interest.
The key factor is the percentage of business use. If you are self-employed or use your vehicle for work (and your employer doesn't reimburse you), you can deduct the interest as a business expense. This is typically done by tracking your business mileage versus total mileage. For example, if you use your car 60% for business, you can deduct 60% of the annual interest paid on the loan.
It's critical to maintain detailed records, including a mileage log and loan statements. The deduction is claimed on Schedule C (Form 1040) for self-employed individuals. For employees who use their car for work (and are not reimbursed), the ability to deduct unreimbursed employee expenses was largely eliminated from 2018 through 2025, making this option unavailable for most W-2 employees.
| Vehicle Use Scenario | Potential for Interest Deduction? | Key Considerations & Method |
|---|
| 100% Personal Use (Commuting, errands) | No | Interest is considered personal interest and is not deductible under current tax law. |
| Self-Employed / Business Owner | Yes (Proportionate) | Deductible as a business expense on Schedule C. Requires strict mileage logs. |
| W-2 Employee (Unreimbursed) | Highly Unlikely | Deduction for unreimbursed employee expenses is suspended for most taxpayers until 2026. |
| Rideshare Driver (e.g., Uber, Lyft) | Yes (Proportionate) | Interest is a deductible business expense for the portion of time spent driving for the platform. |
| Rental Property Business Use | Yes (Proportionate) | If the vehicle is used for managing rental properties, the interest may be deductible against rental income. |
Always consult with a qualified tax professional to understand your specific situation, as tax laws are complex and subject to change. They can help you determine if you qualify and ensure you are taking the deduction correctly.
