The regulation is split between the usage of the of the official sign (740.4) and the advertising statement (740.5) which we use in online banking. Use of the sign is required at a locations and internet sites when deposits are taken or accounts can be opened. The advertising statement does change from time to time as the rules relative to insured amounts are amended.  This statement must be used when placing an add in a publication or statement and even that requirement has specific requirements. Refer to the websites below for more information from the NCUA.