A Certificate of Documentation is valid for one year from the date of issue, providing there are NO CHANGES other than a change of owner’s address. The Certificate must be renewed on an annual basis. Even though it is up to the owner to assure the document does not expire, the Coast Guard will send a Notice of Renewal to the managing owner approximately 45 days prior to expiration. See the instruction letter Renewal of Certificate of Documentation elsewhere at this site regarding renewal procedures.