A new U.S. Postal Service rule places the responsibility for certain foreign customs charges on American merchants selling across borders.

Effective October 19, the rule establishes procedures for collecting or reimbursing foreign duties, taxes, and import fees.

Essentially, the USPS, directly or through a third-party representative, will send a bill to merchants when (i) certain foreign customs fees remain unpaid, or (ii) a foreign party seeks payment.

Responsibility

The rule covers duties, taxes, and potentially broader fees imposed by customs agencies, postal operators, brokers, and other service providers.

If one of those parties reports an unpaid charge, the USPS will now invoice the shipper — called “mailer” in postal parlance.

This does not mean every U.S. merchant sending an international package will receive a bill. Responsibility for customs charges depends on the destination country’s requirements and the shipping method.…