Everything I've been able to find indicates that Business Accounts do NOT enjoy the same expanded FDIC coverage that personal or trust accounts can enjoy by adding joint owners, beneficiaries, etc. It appears that business accounts, regardless of the number of accounts and the number of owners on the accounts are only insured up to $100,000.
However, I haven't found anything that states it clearly and wanted to make sure before I advise the branch on how to handle the question from our customer. Thanks in advance.