A driver who buys a Toyota Camry built in Georgetown, Kentucky can now count the loan interest toward a $10,000 federal tax deduction. A driver who buys the same Camry trim built in Aichi, Japan cannot — same price, same interest rate, same monthly payment. That is the line Treasury and the IRS drew on September 4, 2026, when they filed the final version of the car loan interest deduction rule: the factory that welded the car together decides who qualifies, not the badge on the hood.
A $10,000 Deduction Already Written Into Last Year’s Tax Law
The deduction did not start with this rule. It came from section 70203 of the tax law Congress passed in mid-2025, Public Law 119-21, which added a new exception letting individual taxpayers deduct up to $10,000 a year of interest paid on a qualifying passenger vehicle loan. Congress also wrote the deduction so it works even for people who take the standard deduction instead of itemizing, and it applies to loan interest on debt taken on after December 31, 2024, for tax years beginning after that date and before January 1, 2029 — in practice, tax years 2025 through 2028. For a household carrying a typical new-car loan, that four-year window is the entire practical life of the deduction; it is not a permanent fixture of the tax code the way the mortgage interest deduction is.
What Treasury and the IRS just finished is the rulebook that tells lenders, dealers, and the IRS how to actually apply that year-old-on-paper deduction: which vehicles count, how the income limit is calculated, and what paperwork a lender has to send. The final regulation, Treasury Decision 10054, was filed for public inspection September 4, 2026, is scheduled to publish in the Federal Register on September 8, and takes legal effect November 9, 2026. Until this rule existed, a lender processing a car loan and an accountant preparing a return were both working from the bare statutory language — a $10,000 cap, an income phaseout, an assembly requirement — with none of the mechanical detail that turns a tax provision into something a bank’s paperwork or a household’s return can actually run on.
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The Factory Location Decides, Not the Nameplate
To count as an “applicable passenger vehicle,” the rule requires final assembly to have occurred inside the United States, and it sets the vehicle’s gross weight rating below 14,000 pounds — a line that keeps commercial trucks out and keeps the deduction aimed at ordinary cars, SUVs, and light trucks bought for personal use. Assembly location is not the same thing as brand. Several vehicles sold under foreign nameplates are built in American plants, while some vehicles sold under American nameplates are built overseas or at a shared North American plant, so a buyer cannot assume from the logo, or even from a “Made in America” sticker on the window, that a specific trim and model year actually qualifies.
The final rule points taxpayers to the same tool the IRS itself will rely on: the National Highway Traffic Safety Administration’s VIN decoder, which reads the car’s 17-character vehicle identification number against the manufacturer disclosures required under 49 CFR Part 565. A buyer can run a car’s VIN through that decoder, or check the assembly-point line on the vehicle’s window sticker, before signing loan paperwork — not after. The rule also builds in a fallback for the rare case where the decoder is down or a VIN reads as ambiguous: a taxpayer may rely on the assembly point printed on the vehicle’s own required label rather than the online tool.
The Deduction Shrinks As Income Rises, And Disappears at $150,000
The $10,000 cap is not what most higher earners will actually get. The regulation phases the deduction out by $200 for every $1,000 — or part of $1,000 — that a taxpayer’s modified adjusted gross income exceeds $100,000 for a single filer or $200,000 on a joint return. The IRS’s own worked example in the rule: a single filer who paid $7,000 in qualifying interest but has $124,200 in modified adjusted gross income is $24,200 over the threshold, which rounds up to 25 full $1,000 increments and cuts $5,000 from the deduction — leaving just $2,000 deductible, not $7,000.
Run the math to its end and the deduction hits zero at $150,000 of modified adjusted gross income for a single filer, or $250,000 for a married couple filing jointly. Above those lines, the interest on even a fully qualifying, U.S.-assembled car loan buys nothing on a federal return.
Lenders Now Have to Report the Interest to the IRS
The same rule also finalizes a new information-reporting duty under a separate section of the tax code Congress created alongside the deduction. Any lender or dealer that receives $600 or more in qualifying interest from an individual in a calendar year has to file an information return with the IRS and send the borrower a matching statement by January 31 of the following year, similar to how a mortgage lender already reports mortgage interest on a Form 1098. That reporting requirement runs on the same calendar-year schedule as the deduction itself, 2025 through 2028, and carries the standard IRS penalties for lenders that skip it or file it wrong.
For a household, that statement is worth checking against a lender’s own math before filing. The reporting rule means a bank or credit union processing a qualifying loan is now required to track and disclose the same interest figure a borrower is trying to deduct — so a mismatch between the two numbers is one of the more likely places an eligible deduction gets missed or an ineligible one gets claimed by mistake.
What the November 9 Effective Date Actually Changes
Because the deduction is already statutory, a taxpayer who bought a qualifying, U.S.-assembled vehicle in 2025 does not have to wait until November to claim interest paid that year — the regulation’s own text states it applies to tax years beginning after December 31, 2024. What becomes legally binding on November 9, 2026, is the detailed mechanics this rule locks in: exactly how final assembly is verified, exactly how the income phaseout is calculated, and exactly what lenders must report, for every tax year through 2028. The rule is published under docket TD 10054 at 91 FR 57214, and that citation — not a dealership’s sales pitch about “the new car tax break” — is the version worth checking before assuming a specific vehicle qualifies.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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