CSMS 66146676·Operational·September 5, 2025·View on csms.cbp.gov ↗

INTERIM GUIDANCE: Retroactive Implementation of the United States

Plain-English explanation

CSMS 66146676 is a U.S. Customs and Border Protection (CBP) Cargo Systems Messaging Service bulletin (operational), published on September 5, 2025. It carries the official CBP guidance brokers and importers must follow for the topic — "INTERIM GUIDANCE: Retroactive Implementation of the United States". CSMS messages are the operational layer between Commerce determinations and at-the-border collections: when Commerce publishes a new rate, scope ruling, or instruction, CBP turns it into a CSMS that ACE/ACS systems and brokers act on.

Message body

Full text as published by U.S. Customs and Border Protection

CSMS # 66146676 - INTERIM GUIDANCE: Retroactive Implementation of the United States-Japan Agreement U.S. Customs and Border Protection sent this bulletin at 09/05/2025 07:53 PM EDT Cargo Systems Messaging Service CSMS # 66146676 - INTERIM GUIDANCE: Retroactive Implementation of the United States-Japan Agreement The Executive Order (EO) “ Implementing The United States–Japan Agreement ” signed on September 4, 2025, was issued pursuant to the International Emergency Economic Powers Act. This EO sets a baseline 15 percent ad valorem duty on nearly all imported products of Japan, alongside separate sector-specific treatment for automobiles and automobile parts; aerospace products; generic pharmaceuticals; and natural resources that are not naturally available or produced in the United States. The purpose of this message is to provide guidance on the retroactive clause of the EO, as specified in subsection 2(d). Subsection 2(d) of the EO states, “The tariffs set forth in subsection (a) of this section shall apply retroactively to products of Japan entered for consumption or withdrawn from warehouse for consumption on or after 12:01 a.m. eastern daylight time on August 7, 2025. Any refunds shall be processed pursuant to applicable laws and [U.S. Customs and Border Protection’s (CBP’s)] standard procedures for such refunds.” Pursuant to this retroactive provision, the trade community is not to file a Post Summary Correction or protest until CBP issues instructions on how those requests for refunds should be submitted. CBP will provide additional guidance to the trade community through CSMS messages as appropriate. If you encounter any errors in filing an entry summary, contact your CBP client representative or the ACE Help Desk. Questions regarding this message should be directed to Trade Remedy at traderemedy@cbp.dhs.gov . Related Message: 65829726 Update your subscriptions, modify your password or e-mail address, or stop subscriptions at any time on your Subscriber Preferences Page . You will need to use your e-mail address to log in. If you have questions or problems with the subscription service, please contact subscriberhelp.govdelivery.com . This service is provided to you at no charge by U.S. Customs and Border Protection . Privacy Policy | GovDelivery is providing this information on behalf of U.S. Department of Homeland Security, and may not use the information for any other purposes. Powered by Privacy Policy | Cookie Statement | Help

Frequently asked questions

What is CSMS 66146676?

CSMS 66146676 is a U.S. Customs and Border Protection (CBP) Cargo Systems Messaging Service bulletin titled "INTERIM GUIDANCE: Retroactive Implementation of the United States". CSMS bulletins are the operational instructions CBP issues to brokers, importers, and ACE filers covering rate changes, system updates, scope guidance, and other day-to-day customs-operations changes.

When was CSMS 66146676 published?

CBP published CSMS 66146676 on September 5, 2025. The bulletin's instructions are typically operative as of the publication date unless the body specifies a different effective date.

Is the CBP CSMS the legally binding instruction?

Yes — for at-the-border filing and entry collection. CSMS messages translate Commerce's Federal Register determinations into operational CBP instructions that ACE/ACS systems and brokers execute. The Federal Register notice is the underlying legal authority; the CSMS is the operational implementation. Both should be read together when reconciling a rate or scope change.

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