Most car loan interest is not deductible on your personal tax return
If you borrowed money to buy a car for personal use, the interest you pay on that loan cannot be deducted from your taxable income. The IRS treats car loans the same way it treats most consumer debt — the interest is a personal expense, not a business one. This applies whether you financed through a bank, credit union, or the dealership.
The rule is straightforward: personal interest is never deductible. A car becomes deductible only when it is used for business purposes, and even then, only the business portion of the interest qualifies. A car you drive to work does not count as business use — commuting is considered personal.
Key Takeaways
- Car loan interest for personal vehicles cannot be deducted on your federal tax return, regardless of the interest rate or loan term.
- A vehicle used for business purposes — such as a delivery car or a vehicle used by a self-employed person for work — may allow you to deduct the business portion of the interest.
- Commuting to a job you work for someone else does not count as business use and does not make the interest deductible.
- If you use a vehicle partly for business and partly for personal reasons, you can only deduct the interest that corresponds to the business percentage.
When business use makes interest deductible
If you own a business or are self-employed and use a vehicle for business purposes, you may be able to deduct the interest. The vehicle must be used in your business — not just driven to a location where you work. A delivery driver, a contractor who travels between job sites, or a real estate agent who shows properties can all potentially deduct vehicle interest.
The deduction applies only to the percentage of the vehicle's use that is business-related. If you use a car 60 percent for business and 40 percent for personal errands, you can deduct 60 percent of the interest paid. You will need to track your mileage and be able to document how much of your driving is business versus personal.
The vehicle must be used in your trade or business. Commuting to a job where you are an employee — even if it is a long commute — does not may have access to. The IRS distinguishes between traveling to work (personal) and traveling for work (business).
How to report business vehicle interest on your tax return
If you have a business and use a vehicle for business purposes, you report the deduction on Schedule C (Profit or Loss from Business) if you are a sole proprietor, or on the appropriate business tax form for your entity type. The interest goes in the "Vehicle and Other Assets" or "Interest" section, depending on how your tax software or preparer organizes it.
You will need to calculate the business percentage of your vehicle use. The IRS does not require you to keep a mileage log, but you must be able to show your calculation if audited. Many people track business miles for the year and divide by total miles driven. Keep records of when you drove for business and the purpose of each trip.
If you use the standard mileage rate instead of deducting actual expenses, you do not separately deduct interest — the mileage rate is meant to cover all vehicle costs including interest. If you deduct actual expenses, you can include the interest as part of your vehicle costs.
The difference between interest and principal payments
Your monthly car payment includes both principal (the amount borrowed) and interest (the cost of borrowing). Only the interest portion is potentially deductible for business use. The principal is not deductible under any circumstance because it is straightforward repaying money you borrowed, not an expense of doing business.
Your loan statement or amortization schedule shows how much of each payment goes to interest and how much goes to principal. Early in the loan, most of your payment is interest. Later, most is principal. You can only deduct the interest portion, and only if the vehicle is used for business.
Vehicles used for rideshare or delivery
If you drive for a rideshare service like Uber or Lyft, or deliver for a service like DoorDash or Amazon Flex, your vehicle is used for business. You can deduct the business portion of the interest. However, most drivers in these situations use the standard mileage rate, which simplifies the calculation and does not require you to separately track interest.
If you choose to deduct actual expenses instead of using the mileage rate, you would include the interest as part of your vehicle costs. This approach requires more detailed record-keeping but may result in a larger deduction if your actual expenses are high.
Loans for vehicles you do not own yet
If you are financing a car purchase and have not yet taken ownership, the interest still accrues from the moment the loan is disbursed. You cannot deduct interest on a vehicle before you own it or before it is placed in service for business. Once the vehicle is in use for business, interest becomes deductible (for the business portion) from that point forward.
If you take out a loan in December but do not use the vehicle for business until January, you can only deduct the interest from January onward. The interest accrued in December, when the vehicle was not in business use, is not deductible.
Frequently Asked Questions
Can I deduct car loan interest if I drive for work but do not own a business?
No. If you are an employee driving to a job, that is commuting, which is personal. Interest on a personal car loan is never deductible. Only self-employed people or business owners can deduct vehicle interest, and only for the business portion of use.
What if I use my car partly for business and partly for personal use?
You can deduct the interest that corresponds to the business percentage. If you drive 40 percent for business and 60 percent for personal use, you deduct 40 percent of the interest. You need to track your mileage to support this calculation.
Does the interest rate matter for the deduction?
No. Whether your interest rate is 3 percent or 10 percent, the deductibility rule is the same: only business use qualifies. The amount of interest you pay does not change whether you can deduct it — only the use of the vehicle does.
If I pay off my car loan early, can I deduct the remaining interest?
You can only deduct interest you actually paid. If you pay off the loan early, you pay less interest overall. You deduct only the interest that was paid during the time the vehicle was used for business.
Do I need to keep receipts for the interest payments?
Your loan statements show the interest paid each year. The lender sends you a statement at year-end. You do not need separate receipts, but keep your loan documents and your mileage records to support the business use percentage if audited.