How the Auto Loan Interest Deduction Works
Overview
The One Big Beautiful Bill Act (Public Law 119-21), signed into law on July 4, 2025, created a new above-the-line tax deduction for interest paid on auto loans for qualifying new vehicles. This guide explains everything you need to know about this deduction.
Using the Calculator: Step by Step
Enter Your Annual Interest
Input the total interest you'll pay on your auto loan this year. You can find this on your loan statement or amortization schedule.
Select Your Filing Status
Choose Single, Married Filing Jointly, Married Filing Separately, or Head of Household.
Enter Your Income (MAGI)
Your Modified Adjusted Gross Income determines if you qualify for the full deduction or a reduced amount.
See Your Results
The calculator instantly shows your allowed deduction and estimated tax savings.
What is an "Above-the-Line" Deduction?
The auto loan interest deduction is an "above-the-line" deduction, which means you can claim it even if you take the standard deduction instead of itemizing.
Why This Matters:
- You don't need mortgage interest or other itemizable expenses to benefit
- It reduces your Adjusted Gross Income (AGI) directly
- A lower AGI may qualify you for other tax benefits and credits
- Nearly all taxpayers who qualify can take advantage of this deduction
Eligibility Requirements
Not all auto loans qualify for this deduction. Your vehicle and loan must meet these requirements:
✓ New Vehicle Only
The vehicle must be brand new—used cars, certified pre-owned, and leased vehicles do not qualify.
✓ U.S. Final Assembly
The vehicle must have its final assembly in the United States. Check the VIN or window sticker to confirm.
✓ Personal Use
The vehicle must be for personal use. Business vehicles are excluded from this specific deduction.
✓ Weight Limit
The vehicle's Gross Vehicle Weight Rating (GVWR) must be under 14,000 pounds.
✓ Loan Timing
The loan must be originated after December 31, 2024, for vehicles purchased between January 1, 2025, and December 31, 2028.
Income Phase-Out Thresholds
The deduction phases out for higher-income taxpayers. If your Modified Adjusted Gross Income (MAGI) exceeds certain thresholds, your deduction will be reduced or eliminated.
| Filing Status | Phase-Out Begins | Fully Eliminated |
|---|---|---|
| Single | $100,000 | $150,000 |
| Married Filing Jointly | $200,000 | $250,000 |
| Married Filing Separately | $100,000 | $125,000 |
| Head of Household | $100,000 | $150,000 |
How Tax Savings Are Calculated
Your actual tax savings depend on your marginal tax rate. Here's the formula:
Tax Savings = Allowed Deduction × Marginal Tax Rate
Example Calculation:
- • Annual interest paid: $3,000
- • Filing status: Single with $80,000 income (no phase-out)
- • Allowed deduction: $3,000 (full amount, under $10,000 cap)
- • Marginal tax rate: 22%
- • Tax savings: $3,000 × 22% = $660
Important Dates
Deduction begins
Applies to loans originated after December 31, 2024
Last year for new qualifying vehicles
Vehicles must be purchased by December 31, 2028
Continue claiming on existing loans
You can continue to deduct interest on qualifying loans until they're paid off