Millions of car buyers who finance their vehicles now have a new federal tax break, but the benefit is tightly income-capped and expires after just four tax years. Under rules signed into law as part of the One, Big, Beautiful Bill Act, taxpayers with modified adjusted gross income below $100,000 can deduct up to $10,000 in auto-loan interest annually for tax years 2025 through 2028. The deduction phases out dollar-for-dollar above that income line, and claiming it requires reporting the vehicle identification number on a brand-new IRS form.
How the $10,000 auto-loan interest deduction works and who qualifies
The statutory framework sits in Section 163 of the Internal Revenue Code, which created special rules for qualified passenger vehicle loan interest effective for tax years 2025 through 2028. The annual cap is $10,000 per return, regardless of how many vehicles a taxpayer finances. For single filers, the MAGI phaseout begins above $100,000. Joint filers hit the threshold at $200,000. Once income exceeds those lines, the allowable deduction shrinks by $200 for every $1,000, or fraction of $1,000, above the cutoff.
A single filer earning $105,000, for example, would be $5,000 over the threshold. Because each $1,000 (or part of $1,000) over the line reduces the deduction by $200, that filer would lose $1,000 of the maximum benefit and could deduct only $9,000 of interest if they paid at least that much. At $150,000 in MAGI, the benefit disappears entirely for a single filer, even if they paid more than $10,000 in interest during the year. The same math applies to joint filers using the $200,000 threshold.
The provision was enacted as part of Public Law 119-21, better known as the One, Big, Beautiful Bill Act. Lawmakers framed the deduction as temporary relief aimed at offsetting higher borrowing costs for middle-income households. Because it is scheduled to sunset after 2028, Congress would need to act again to extend or modify the benefit.
To claim the deduction, taxpayers must use a new Schedule 1-A, which attaches to Form 1040, 1040-SR, or 1040-NR. The IRS requires filers to list the vehicle identification number for every loan generating a claimed deduction, according to the agency’s Schedule 1-A explainer. That VIN requirement adds a verification layer that did not exist for prior consumer-loan interest deductions, and it effectively limits the break to loans used to buy or refinance specific passenger vehicles, rather than general-purpose personal debt.
Only interest on qualified loans is eligible. While the statute leaves technical definitions to Treasury regulations and IRS guidance, the structure of the rule points to standard consumer auto financing for passenger vehicles used primarily for personal transportation. Leases do not generate deductible “interest” for this purpose, and business-use vehicles are expected to remain subject to separate, existing rules under the business interest and depreciation provisions of the tax code.
Lender transition relief and the 2025 filing timeline
Because the law took effect mid-year, auto lenders and financial institutions face a compressed timeline to update their reporting systems. They will need to track interest payments in more detail, associate those amounts with specific VINs, and send borrowers statements that align with the new IRS form. Many lenders currently provide annual interest summaries as a courtesy, but the new deduction will push those statements closer to the kind of standardized reporting used for mortgage interest.
Treasury and the IRS responded to these operational challenges by issuing Notice 2025-57, published in Internal Revenue Bulletin 2025-45, granting transition relief for 2025 so businesses can build the infrastructure needed to send borrowers the required interest statements. The accompanying IRS release explains that lenders will have extra time and flexibility in how they report interest for the first year the deduction is in effect, as long as they make good-faith efforts to comply.
That transition period is intended to reduce the risk that borrowers miss out on the deduction simply because their lender could not retool its systems fast enough. For 2025 returns filed in early 2026, taxpayers may see varying formats for interest statements, and some may need to rely on year-end account histories or online statements rather than a standardized tax form. The IRS has signaled that it will accept reasonable documentation from borrowers while the new reporting regime is phased in.
Taxpayers, however, remain responsible for accurately tracking how much interest they pay and for matching each amount to a specific vehicle and VIN on Schedule 1-A. Filers who refinance during the year will need to ensure they capture interest from both the original and replacement loans. Those who sell a vehicle or pay off a loan early can still deduct interest paid before the payoff date, subject to the annual cap and income limits.
With only four tax years covered, the new deduction offers a narrow window for planning. Households considering a vehicle purchase or refinance may want to factor the potential tax savings into their cost calculations, while recognizing that the benefit shrinks quickly as income rises above the thresholds. Unless Congress acts to extend it, the deduction will vanish after 2028, returning auto-loan interest to its long-standing status as a nondeductible personal expense for most taxpayers.
Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
