Effective September 1, 2025, the Postal Service™ will revise Mailing Standards of the United States Postal Service, International Mail Manual (IMM®), to reflect revisions to the Regulations of the Universal Postal Convention that concern requiring the sender of an item containing goods of a commercial nature to provide, at minimum, the 6–digit WCO Harmonized System tariff codes on the customs declaration for each article contained in the mailpiece.
Mailing Standards of the United States Postal Service, International Mail Manual (IMM)
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1 International Mail Services
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120 Preparation for Mailing
123 Customs Forms and Online Shipping Labels
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123.7 Completing Customs Forms
123.71 Preparation and Acceptance of Electronically Generated Customs Forms
123.711 Sender’s Preparation of Electronically Generated Customs Forms
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[In 123.771(a), add a new item 5 and renumber current item 5 as item 6, to read as follows:]
a. Mandatory Data Elements: The following data elements are mandatory for all customs forms regardless of mail class: ***
5. Harmonized System (HS) code, Harmonized Tariff Schedule (HTS) code, or Schedule B number. At minimum, the sender must provide the 6-digit WCO HS code for each item in the package unless otherwise specified in the individual country listing.
6. Sender’s signature and date.
[In 123.771(b), delete item 7 and renumber current item 8 as item 7, to read as follows:]
b. Conditional Data Elements: The following data elements may be required based on the contents of the package and other nonpostal rules and regulations: ***
7. Country of origin of goods.
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Although effective September 1, 2025, the Postal Service will incorporate these revisions into the September 8, 2025, edition of the online IMM, which is available via Postal Explorer® at pe.usps.com.
— Product Classification,
Product Solutions, 8-7-25
