Whether you can impose a fee is a matter of state law. You would have to disclose it, even if that means you would have to add this fee to those already being disclosed for your other savings accounts. That could be done with an addendum to the disclosures, as long as it's delivered with the rest of the account disclosures for the account.
I can't find a way to exclude these accounts from the coverage of Regulation DD.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8