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2025 Tax Alert: The New Auto Loan Interest Deduction Explained

With interest rates remaining a significant factor in household budgets, the IRS has released proposed regulations that offer welcome relief for car buyers. Under the One Big Beautiful Bill Act, taxpayers may soon be eligible to deduct interest paid on loans for qualified passenger vehicles. This temporary provision is effective for loans originated after December 31, 2024, and covers tax years 2025 through 2028.

For many of our clients, this is a unique opportunity to lower taxable income, but the eligibility rules are specific. Here is what you need to know before you sign paperwork at the dealership.

Couple looking at new car options

Who Qualifies for the Write-Off?

The most distinct feature of this new rule is that it is a "below-the-line" deduction. This means you do not need to itemize to benefit; you can claim this reduction to your taxable income even if you take the standard deduction. This opens the door for significantly more taxpayers to participate.

However, there are caps and phaseouts to consider:

  • Deduction Limit: You can claim up to $10,000 annually per return (married couples filing separately are also capped at $10,000 each).

  • Income Thresholds: The benefit begins to phase out for single filers with a modified Adjusted Gross Income (AGI) over $150,000, and for married couples filing jointly with an AGI over $250,000.

  • Eligible Entities: While primarily for individuals, certain trusts and estates may also qualify.

Vehicle Requirements: Buy American, Buy New

This legislation is designed to support domestic manufacturing. To qualify, the vehicle must be new—used cars are ineligible—and it must be assembled in the United States. Qualifying vehicles include cars, SUVs, minivans, and trucks with a gross vehicle weight rating under 14,000 pounds.

Before purchasing, you should verify the final assembly point using the vehicle’s VIN. You can check that status here: Welcome to VIN Decoding : provided by vPIC.

Accountant reviewing tax documents

Navigating Personal vs. Business Use

To claim this specific deduction, you must anticipate using the vehicle for personal purposes more than 50% of the time when you buy it. The good news is that you are not required to adjust this estimate in future years, even if your personal use percentage drops.

If you use the vehicle for both business and personal driving, the math gets slightly more complex. You can still claim a business expense deduction for the interest related to business use, but you cannot double-dip. Your claim on the new Schedule 1-A will be reduced proportionally by the amount claimed as a business expense.

Loan Rules and Documentation

Not all financing qualifies. The loan must be secured by the vehicle and originate from an independent lender, such as a bank or credit union. Personal loans from family members do not qualify, and interest paid on leased vehicles is fully excluded.

Deductible expenses include interest on the vehicle price, as well as interest directly linked to sales tax, vehicle fees, and service plans. If you refinance later, only the interest on the outstanding balance at the time of refinancing is eligible.

Paperwork and financial planning

What to Watch For

Lenders will eventually be required to file Form 1098-VLI if you pay more than $600 in interest. However, for 2025, the IRS is allowing lenders to provide a simple statement instead. You will need to include the vehicle's VIN on your new tax schedule to finalize the claim.

These rules are brand new and contain several nuance traps regarding mixed-use vehicles and income phaseouts. If you are planning a vehicle purchase this year, please reach out to our office so we can ensure you structure the purchase to maximize your tax position.

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