Well, you need to provide prospective customers of the new fee, so whatever "bundle" of disclosures you provide at account opening will have to have it.
You can notify your existing consumer customers by any written means you wish to employ, except that if you want to do it electronically, the consumer must have already signed up for electronic disclosures, in an e-Sign compliant mode.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8