New Auto Loan Tax Deduction: A Rare Break for Personal Car Buyers

It is not often that we get to tell clients they can deduct interest on a personal expense. Usually, unless it is a mortgage or a business asset, interest payments are just money out the door. However, under the proposed regulations of the One Big Beautiful Bill Act, that is changing for car buyers between 2025 and 2028.

If you financed a new vehicle after December 31, 2024, you might be eligible for a temporary tax deduction designed to support American manufacturing. Here is how to determine if you—and your new car—qualify.

Calculator and tax forms on a desk

The Financials: Who Qualifies and How Much?

The most distinct feature of this new rule is that it is a "below-the-line" deduction. In plain English, this means you do not need to itemize to claim it. Whether you take the standard deduction or itemize, this reduces your taxable income directly.

However, there are caps to keep in mind:

  • The Dollar Limit: You can deduct up to $10,000 in interest per annual tax return. If you are married filing separately, that limit is $10,000 each.
  • Income Phaseouts: High earners may see this benefit reduced or eliminated. The deduction begins to phase out if your modified Adjusted Gross Income (AGI) exceeds $150,000 (or $250,000 for married couples filing jointly).

Does Your Vehicle Make the Cut?

Not every car on the lot will unlock these savings. The legislation is specifically targeted at new, domestic passenger vehicles. To qualify, the vehicle must be:

  • New: Used cars do not qualify.
  • American-Made: Final assembly must occur in the United States.
  • Passenger Ready: It must be a car, SUV, minivan, pickup, or motorcycle with a gross weight rating under 14,000 pounds.

If you are unsure where your vehicle was assembled, the Department of Transportation provides a decoder tool. You will need your VIN to verify eligibility, which you will also need when filing your Form 1040.

Welcome to VIN Decoding : provided by vPIC

Car gears and mechanics

Personal Use and Loan Rules

To claim this, you must anticipate using the vehicle for personal purposes more than 50% of the time at the time of purchase. Interestingly, you do not need to adjust this in future years if your personal use percentage drops.

If you use the car for both business and personal trips, you will have to do a little math. You can claim the business portion as a business expense and the personal portion under this new Schedule 1-A, proportionally. Just ensure you don't double-dip.

What About Leases and Family Loans?

The IRS is strict about where the money comes from and how the deal is structured:

  • No Leases: Interest paid on leased vehicles is not deductible.
  • No Family Loans: The loan must come from an independent lender, like a bank or credit union. Borrowing from a relative disqualifies the interest.
  • Refinancing: If you refinance, only the interest on the outstanding balance at the time of the refi is eligible.

Paperwork to Watch For

Lenders are required to file a new form, Form 1098-VLI, if you paid at least $600 in interest. For the 2025 tax year, you might just receive a standard statement from your lender instead of the official form, which is acceptable for filing purposes.

While this is a great opportunity to save, the rules regarding mixed-use vehicles and income phaseouts can get tricky. If you bought a new car this year or plan to, let’s discuss it during your next appointment to ensure we capture the full deduction.

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