Prove Your Mexican Car's American Soul or Pay Tariff Penalty
Published Date: 8/19/2026
Notice
Summary
In Proclamation 10908 of March 26, 2025, "Adjusting Imports of Automobiles and Automobile Parts Into the United States," the President imposed additional tariffs on imports of specified automobiles and automobile parts to eliminate the threat to national security posed by such imports. That Proclamation also provided that for automobiles that qualify for preferential tariff treatment under the United States-Mexico-Canada Agreement (USMCA), importers of such automobiles may submit documentation to the Secretary of Commerce (Secretary) identifying the amount of U.S. content in each model imported into the United States. In a Federal Register Notice published on May 20, 2025, "Procedures for Submission by Importers of Automobiles Qualifying for Preferential Tariff Treatment Under the USMCA to Determine U.S. Content," the Department of Commerce (Department) established procedures for submission and review of such documentation. This Notice amends those procedures to conform those procedures with the submission timelines for medium- and heavy-duty vehicles, consistent with Proclamation 10984 of October 17, 2025, "Adjusting Imports of Medium- and Heavy-Duty Vehicles, Medium- and Heavy-Duty Vehicle Parts, and Buses Into the United States."
Analyzed Economic Effects
6 provisions identified: 2 benefits, 4 costs, 0 mixed.
Retroactive tariff for misreporting
If CBP finds that an importer overstated U.S. content, the 25 percent tariff will be applied retroactively from April 3, 2025 to the date of the inaccurate overstatement and prospectively until corrected. That 25 percent tariff will apply to the full value of all automobiles of the same model line imported by the same importer.
One-year U.S.-content approvals
If your automobile model is approved, the Department’s U.S. content eligibility determinations will be valid for one year: for the 2026–2027 cycle they apply to automobiles imported from December 1, 2026 through November 30, 2027. All determinations previously issued remain valid for automobiles imported before December 1, 2026, regardless of any earlier expiration date.
New filing deadlines for submissions
To be considered for vehicles imported on or after December 1, 2026, importers must submit new U.S. content documentation by September 30, 2026. For vehicles imported on or after December 1, 2027, documentation must be submitted no later than September 1, 2027, and importers of a new model may apply at any time (valid until the next December 1).
Tariff applies only to non-U.S. content
For automobiles that qualify under USMCA and receive an eligibility determination, the additional tariff (25 percent as provided in Proclamation 10908) will be applied exclusively to the value of the non-U.S. content for each authorized model line. The Department will inform CBP of the non-U.S. content value for each approved model line so CBP can apply the tariff accordingly.
Paperwork burden per submission
The information collection for these submissions has OMB Control Number 0625-0143 and the Department estimates public reporting to be approximately 20 hours per response. Responses are voluntary, but the estimated 20 hours is the expected time to prepare each submission.
Obligation to report sourcing changes
Importers must promptly inform the Department and request a new eligibility determination if changes in sourcing or production decrease the U.S. content that was the basis for an eligibility determination. If sourcing changes increase U.S. content, the importer may submit a new request to seek updated treatment.
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Key Dates
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