It's an operational decision what accounts you choose to offer to which types of customers. If you believe a customer is operating a business (regardless of how the business is organized) you have every right to require that person open a business account and pay the applicable fees associated with that account. For example, many institutions charge fees on business accounts based on the volume of cash being deposited and you could be missing out on that fee income because the customer opened a personal account. A customer does not need a trade name to run a business if they are operating as an independent contractor using their own name.
The SAR discussion is not relevent to whether the account is a business account or a personal account. Either the volume of cash being deposited is suspicious based on the anticipated and expected activity for the customer or it is not suspicious. I don't see how the type of account has any relevace to that discussion.
Sola Gratia, Sola Fides, Sola Scriptura, Solus Christus, Soli Deo Gloria!www.tcaregs.com