If it's a charge that's disclosed under Reg DD and not Reg E, there's a 30-day notice. If it's under Reg E and not Reg DD, it's a 21 day notice. If both, Reg DD allows you to use the Reg E notice period.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8