Understanding the New Tax Deduction for Car Loan Interest

The One Big Beautiful Bill Act, signed into law on July 4, 2025, created a brand new deduction that lets taxpayers write off interest paid on car loans. For anyone who financed a new vehicle purchase this year or plans to buy one before 2029, this provision deserves careful attention.

What the Deduction Actually Does

Taxpayers can now deduct up to $10,000 annually in interest paid on qualifying auto loans. That cap sits high enough that most borrowers won’t reach it unless they took on a pricier vehicle at today’s rates. A buyer who financed $47,000 at 6.5% ends up paying somewhere around $3,100 in interest that first year. Still real money, but well under the maximum.

The deduction runs from tax year 2025 through 2028. Congress built in a sunset date, so unless lawmakers extend the provision, it disappears after four years. Returns filed in early 2026 for tax year 2025 mark the first opportunity to claim this benefit.

Here’s the part that makes this deduction unusual: it works even for people who take the standard deduction. Most interest deductions require itemizing, which fewer and fewer Americans bother with since the standard deduction jumped so high back in 2017. This one sits “above the line,” reducing taxable income regardless of whether someone itemizes. A CPA can help clients understand exactly how this affects their individual tax situation.

Who Qualifies

The rules narrow eligibility more than the headlines suggest. Not every car buyer gets to participate.

• Income limits apply. Single filers see the deduction begin shrinking once modified adjusted gross income passes $100,000, with married couples filing jointly hitting that phaseout at $200,000. The benefit goes away completely at $150,000 for singles and $250,000 for joint filers. For every $1,000 earned above the starting threshold, the maximum deduction drops by $200. A single taxpayer bringing in $110,000 would qualify for $8,000 rather than the full $10,000.

• The vehicle must be new. Used cars don’t count, no matter how recently manufactured. The taxpayer claiming the deduction has to be the first owner putting that vehicle into service. That brand-new sedan sitting on the dealer lot qualifies; the three-year-old certified pre-owned version does not.

• Final assembly must happen in the United States. This requirement catches people off guard. Plenty of foreign-brand vehicles roll off American assembly lines, while some domestic brands manufacture certain models in Mexico or Canada. Checking the VIN reveals where assembly occurred—numbers beginning with 1, 4, or 5 mean the vehicle was assembled domestically. The window sticker at the dealership lists the final assembly point, and buyers should verify before signing anything.

• Personal use only. Business vehicles, fleet cars, and anything used for commercial purposes fall outside the deduction. Someone who drives their car exclusively for work cannot claim this benefit on that vehicle. A CPA should review situations where a vehicle serves both personal and business purposes.

What Counts as a Qualifying Loan

The financing arrangement matters as much as the vehicle itself.

Loans must be secured by the vehicle. That means the lender holds a first lien on the car and can take it back if the borrower stops making payments. Personal loans without that security interest don’t qualify for this deduction, even when the borrowed money went straight toward buying the vehicle.

Leases are out. Monthly lease payments look like loan payments and feel like loan payments, but they represent a fundamentally different transaction. The deduction covers interest on money borrowed to purchase a vehicle. Lessees don’t actually buy anything—they pay for depreciation and the use of someone else’s property.

The loan must have originated after December 31, 2024. Vehicles purchased and financed before 2025 don’t qualify, even though the deduction period started January 1, 2025. That timing catches some buyers who pulled the trigger in late 2024.

Cash purchases generate no deduction because there’s no loan and therefore no interest to deduct. Someone who paid $50,000 out of pocket for a new truck gets nothing from this provision.

Refinancing Gets Complicated

What happens when someone refinances their qualifying auto loan? The IRS says interest on the refinanced amount generally remains eligible. However, the details matter enormously here. Taxpayers who refinanced and pulled cash out, or rolled negative equity from a previous vehicle into the new loan, face more complex calculations. Working with a CPA makes sense whenever refinancing muddies the waters.

Documentation Requirements

Taxpayers must include the vehicle identification number on their return for any year they claim this deduction. That seventeen-character VIN proves the vehicle meets assembly requirements.

Lenders are required to report interest received on qualifying loans. For 2025, the IRS granted transition relief since reporting forms weren’t finalized when the law passed mid-year. Lenders can satisfy obligations by making interest totals available through online portals or written statements. Starting in 2026, borrowers should expect something resembling a 1098 form showing interest paid during the year.

Keeping loan documents organized saves headaches later.

Vehicles That Typically Qualify

Many popular models meet the requirements. Honda builds the Accord, CR-V, Civic, Pilot, and Ridgeline at Ohio, Indiana, and Alabama plants. Toyota assembles the Camry and Tundra domestically. American manufacturers produce plenty of qualifying vehicles, though not every model—some get assembled across the border.

The vehicle must weigh under 14,000 pounds gross vehicle weight rating, which covers essentially every passenger car, SUV, minivan, and pickup that ordinary consumers purchase.

What to Know

This deduction puts real money back in taxpayers’ pockets. Someone in the 22% bracket who deducts $3,000 in auto loan interest saves $660 on their federal tax bill. Higher brackets see proportionally larger savings.

The rules contain enough complexity that assumptions prove dangerous. Income phaseouts, assembly requirements, loan structure specifications, and documentation needs all create opportunities to either miss legitimate benefits or claim deductions incorrectly. Anyone planning a vehicle purchase should consult with a CPA before finalizing the deal. For those who already bought qualifying vehicles in 2025, organizing documentation now prevents scrambling at tax time.

by Kate Supino