CSMS #69289734 · Implementation of Entry Type 13 Test in ACE for U.S. Mail Processing (INT-057) and Mail Entry Type 13 Test (CBP-290) – Deploying to ACE CERT Environment on July 24, 2026 and to ACE PROD Environment on September 22, 2026

Brief takeaway: CBP is rolling out a new ACE entry type (Entry Type 13) for U.S. Postal Service international mail shipments, tied to changes in how mail imports and de minimis are handled.

What changed: According to the notice, CBP will deploy enhancements (INT-057 and CBP-290) to ACE that implement a test of Entry Type 13, a new entry type for submitting USPS international mail shipment data. The notice states these enhancements will be available in the ACE Certification (CERT) environment on July 24, 2026, and deployed to the Production (PROD) environment on September 22, 2026, and that they include impacts to electronic data interchange (EDI). The notice references CBP Federal Register Notices published June 24, 2026, including a test of a new electronic informal entry process for mail and an indefinite suspension of the de minimis exemption for merchandise arriving through all modes other than the international postal network.

Who's affected: The notice names U.S. Postal Service (USPS) international mail shipments. No specific product types, HTS chapters, or countries of origin are specified in the notice.

What to review:
- Review whether any of your inbound shipments arrive via the international postal network and may involve Entry Type 13.
- Confirm with your broker or software provider how the referenced EDI changes may affect your ACE filings.
- Check the CBP Trade Information Notice and the June 24, 2026 FRNs linked in the notice for further detail.
- Confirm the CERT and PROD deployment timing with your broker.

This is general information, not legal advice and not a compliance determination — confirm specifics with a licensed customs broker or trade counsel.