Car loan interest is not deductible on your personal tax return in 2025

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 differently depending on how you use the vehicle. Personal vehicles—cars, trucks, and SUVs you drive for commuting, errands, or family trips—fall into a category where interest is straightforward not deductible, no matter how much you pay.

This rule has been in place for decades and has not changed for 2025. The only exception is if you use the vehicle for business purposes, and even then, the rules are specific and require careful documentation.

Key Takeaways

  • Interest on a car loan for personal use cannot be deducted on your federal tax return, and this applies whether you itemize deductions or take the standard deduction.
  • If you use a vehicle for business purposes, you may deduct either the actual expenses (including loan interest) or use the standard mileage rate, but you must track business miles separately from personal miles.
  • Self-employed people and business owners can deduct vehicle expenses, but the IRS requires detailed records showing the business purpose of each trip.
  • Commuting to and from a regular job is considered personal use, so loan interest related to commuting is never deductible.
  • State and local taxes do not allow deductions for personal car loan interest either, though rules vary by state for business vehicles.

When a car loan might be deductible: business use only

The one situation where car loan interest becomes relevant to your taxes is if you use the vehicle for business. This does not mean driving to your job at an office or factory—that is commuting, which is personal use. It means using the car as part of running a business you own or as a self-employed person.

If you are self-employed and use a vehicle to make deliveries, visit clients, or conduct business errands, you can deduct vehicle expenses. You have two choices: deduct the actual expenses (including loan interest, gas, insurance, and maintenance) or use the standard mileage rate, which is a flat amount per mile the IRS sets each year. For 2025, the standard mileage rate for business use is 67 cents per mile (this rate changes annually and varies by use category).

If you choose to deduct actual expenses, you can include the interest portion of your loan payments. However, you can only deduct the interest for the miles driven for business. If you drive the same car for both business and personal use, you must track business miles separately and calculate what percentage of your driving is business-related.

How to track business use and document it for the IRS

The IRS requires contemporaneous records of business vehicle use, which means you need to document it as you go, not reconstruct it months later. You do not need to file a special form, but you must be able to show the IRS that your records are accurate if you are audited.

Keep a log or use a mileage-tracking app that records the date, starting and ending odometer readings, business purpose, and destination for each trip. At minimum, note the total business miles driven during the year and the total miles driven for all purposes. The IRS is skeptical of round numbers and perfect percentages, so realistic, detailed records carry more weight.

If you use the standard mileage rate, multiply your business miles by the 2025 rate (67 cents per mile). If you deduct actual expenses, gather receipts for loan interest, gas, insurance, repairs, and depreciation, then calculate the business percentage and deduct only that portion. Many people find the standard mileage rate simpler because it requires less record-keeping, though actual expenses may yield a larger deduction if your vehicle is expensive to maintain.

Commuting does not count as business use

A common misunderstanding is that driving to work is deductible. It is not. The IRS classifies commuting—traveling from your home to your regular workplace and back—as personal use, even if you drive a long distance or use the car exclusively for that purpose.

The distinction matters because some people think that if they drive only to their job and nowhere else, the car is "for work." That is not how the IRS sees it. Commuting is the cost of getting to your job, similar to rent or groceries. Business use means using the vehicle as part of operating a business you own or as a self-employed person.

If you are an employee and your employer reimburses you for mileage, that reimbursement is not taxable income to you (up to the IRS standard mileage rate), but you cannot also deduct the mileage yourself. You get one or the other, not both.

Loan interest versus other car expenses

It is worth understanding why the IRS treats car loan interest differently from other vehicle expenses. For business vehicles, you can deduct gas, insurance, repairs, registration, and depreciation—but only the business-use portion. Loan interest follows the same rule: if the vehicle is used for business, the interest is deductible as part of actual expenses; if it is personal, it is not.

The standard mileage rate is designed to cover all these expenses in one number, so if you use that method, you do not itemize interest separately. You straightforward multiply business miles by the rate and claim that amount.

For personal vehicles, none of these expenses are deductible—not gas, not insurance, not repairs, and not interest. This is why many people ask about interest specifically: they are looking for any angle to reduce their tax burden, but the IRS does not allow it for personal use.

State taxes and car loan interest

State income tax rules generally follow federal rules: personal car loan interest is not deductible. However, some states have different rules for business vehicles or self-employed people, so it is worth checking your state's tax guidance if you use a vehicle for business.

A few states do not have income tax at all (Alaska, Florida, Nevada, South Dakota, Tennessee, Texas, Washington, and Wyoming), so the question does not explore there. If you live in a state with income tax and use a vehicle for business, your state may allow the same deductions as the IRS, or it may have stricter or more lenient rules. Your state tax department's website will have guidance specific to your situation.

What to do if you have a business vehicle

If you own a business or are self-employed and use a vehicle for business purposes, start by deciding whether to use the standard mileage rate or deduct actual expenses. The standard mileage rate is simpler and requires less documentation. Actual expenses may save you more money if your vehicle is expensive to operate, but they require detailed record-keeping and receipts.

Whichever method you choose, track your business miles from the start of the year. At tax time, calculate the business percentage of your total driving. If you deduct actual expenses, gather all receipts and calculate the interest portion of your loan payments. If you use the standard mileage rate, multiply business miles by 67 cents (the 2025 rate) and claim that amount on your tax return.

Keep your mileage log and receipts for at least three years in case the IRS audits your return. Many tax software programs and apps can help you organize this information, and a tax professional can review your records to make sure you are claiming the right amount.

Frequently Asked Questions

Can I deduct car loan interest if I use my car for rideshare or delivery?

Yes, if you drive for a rideshare or delivery service as a business, you can deduct vehicle expenses. You must track the miles driven for that business separately from personal miles. Many rideshare and delivery drivers use the standard mileage rate because it is simpler than tracking actual expenses, but you can choose either method.

What if I use the same car for both commuting and business?

You can deduct the business portion only. If you drive 20,000 miles total in a year and 5,000 of those are for business, you can deduct 25 percent of your vehicle expenses or use the standard mileage rate for the 5,000 business miles. Commuting miles are never deductible.

Does the type of car matter—can I deduct interest on a luxury car loan?

The type of car does not change the rule: personal car loan interest is not deductible, whether the car costs $15,000 or $150,000. For business vehicles, the car's cost does affect depreciation deductions, but interest is treated the same way regardless of the vehicle's price.

If I refinance my car loan, does that change whether interest is deductible?

No. Refinancing does not change the use of the vehicle. If the car is for personal use, the interest on a refinanced loan is still not deductible. If the car is for business use, the interest on a refinanced loan is still deductible (for the business portion).

Can I deduct interest on a car loan if I itemize deductions?

No. Personal car loan interest is not deductible whether you itemize deductions or take the standard deduction. It is not a deductible expense category at all for personal vehicles, so it does not matter which deduction method you use.