On December 14, 2020, in Cargo Systems Messaging Service (CSMS) #45160124, U.S. Customs and Border Protection (CBP) announced the 2021 payment dates for Periodic Monthly Statements (PMS). Filers who are signed up for PMS may pay duties on shipments entered or released during the previous calendar month.
The list of PMS dates for 2021 can be found here:
https://www.cbp.gov/document/guidance/periodic-monthly-statement
CSMS #45160124 can be found here: