Car Loan Interest Deduction Calculator — Free 2026

Understanding the Car Loan Interest Deduction (OBBB Act)

The One Big Beautiful Bill Act, signed into law on July 4, 2025, introduced several new tax deductions for American workers. One of the most impactful is the auto loan interest deduction, which allows taxpayers to deduct up to $10,000 per year in interest paid on a qualifying car loan. This deduction is available for tax years 2025 through 2028 and applies even if you take the standard deduction — making it accessible to the vast majority of filers.

Who Qualifies for the Deduction?

To claim the car loan interest deduction, you must meet several requirements. The vehicle must be new (not used), have final assembly in the United States, and be purchased for personal use after December 31, 2024. Qualifying vehicle types include cars, SUVs, pickup trucks, minivans, vans, and motorcycles with a gross vehicle weight under 14,000 pounds. The loan must be a standard auto loan secured by the vehicle as a first lien — lease payments do not qualify.

The deduction is also subject to income limits. For single filers, the deduction begins phasing out at $100,000 of modified adjusted gross income (MAGI) and is completely eliminated at $200,000. For married couples filing jointly, the phaseout range is $200,000 to $400,000. Head of household filers phase out between $150,000 and $300,000. This calculator automatically applies the phaseout so you can see your actual allowable deduction.

How the Phaseout Works

The income phaseout reduces your deduction proportionally. If your MAGI falls in the middle of the phaseout range, you receive a partial deduction. For example, a single filer earning $150,000 is halfway through the $100,000–$200,000 phaseout range, so their deduction would be reduced by 50%. On $4,000 of interest, that means a $2,000 allowable deduction instead of the full amount.

If you are also estimating your overall take-home pay, our salary calculator includes 2026 federal tax brackets and can help you understand your full tax picture.

How to Claim the Deduction

The car loan interest deduction is reported on Schedule 1-A of your federal tax return. You will need to provide the Vehicle Identification Number (VIN) of the qualifying vehicle and the total interest paid during the tax year. Your lender should provide this information on your annual loan statement. Starting with tax year 2026, employers are required to report overtime and tip information on W-2 forms, but car loan interest must be tracked by the taxpayer.

Marginal Tax Rate and Your Savings

Your actual tax savings depend on your marginal tax rate — the rate at which your last dollar of income is taxed. For 2026, federal tax brackets range from 10% to 37%. A taxpayer in the 22% bracket who deducts $4,000 in car loan interest saves approximately $880 in federal taxes. Someone in the 32% bracket with the maximum $10,000 deduction could save up to $3,200. This calculator estimates your bracket based on your filing status and income to give you an accurate savings estimate.

If you are considering purchasing a vehicle and want to understand the full cost including financing, our mortgage calculator uses a similar amortization approach that applies to auto loans as well.

Key Limitations to Know

The deduction is limited to $10,000 per year regardless of how much interest you actually paid. It only applies to new vehicles assembled in the United States — imported vehicles and used vehicles do not qualify. Business vehicles and vehicles used for commercial purposes are excluded (those may qualify for different deductions under Section 179). The deduction expires after the 2028 tax year unless Congress extends it. Lease payments, even for qualifying vehicles, are not deductible under this provision.

Example Calculation