Authorization Letter Format It is very important that your authority letter has all the information related to the responsibilities very clearly. LETTER OF AUTHORIZATION . Fillable and printable Authorization Letter Templates 2020. I, Joe Michelson, hereby authorize my son, James Michelson, to conduct all activities regarding my properties and fill the forms and sign all the documents on my behalf. Dear Dr. Moore. DOD Letter of Authorization Form Letter of Authorization Instructions To start the process of getting a LOA on file: Fill out the form completely, including digital signatures. This image may not be used by other entities without the express written consent of wikiHow, Inc.