The Coding Accuracy Support System (CASS) measures the accuracy of address matching software based on rules defined by the Postal Service.  USPS is actively working with the mailing industry to perform a new testing cycle referred to as CASS Cycle O.

The Postal Service has determined that the CASS Cycle O implementation schedule will be rescheduled to a new implementation date of August 1, 2023.  The current CASS Cycle N will be extended until July 31, 2023.

The Postal Service will continue to work with the mailing industry to ensure all requirements are met related to Address Quality / CASS Cycle O and the new timeline to support an August 2023 implementation date.

CASS Cycle O has experienced multiple delays. If the August 2023 date changes we will let you know.