On September 28, 2026, U.S. Customs and Border Protection (CBP) published a bulletin via its Cargo Systems Messaging Service (CSMS) providing implementation guidance for Presidential Proclamations 11061, 11062, and 11063, which identify certain Canadian-origin products as to be "excluded from importation" into the U.S.

According to the bulletin, as of 12:01 a.m. Eastern Time on September 29, 2026, any entry that contains products covered by the three proclamations "will be unconditionally rejected" by CBP.

Products entered into a Customs bonded warehouse or admitted prior to the exclusions taking effect "may be withdrawn for consumption and will be subject to the 50 percent ad valorem duty under Presidential Proclamations 11046, 11047, and 11048, as applicable."

The CSMS bulletin also provides guidance on the scope of alcoholic beverages subject to the exclusion and outlines new reject messaging added to the Automated Commercial Environment (ACE) to support the enforcement of the exclusion.

CSMS # 70050970, which includes annexes listing covered products, can be found here:
https://content.govdelivery.com/bulletins/gd/USDHSCBP-42ce49a?wgt_ref=USDHSCBP_WIDGET_2