If your clients have any question about whether their banks charge for receiving ACH direct deposits of this type, they should contact the banks in question. Although it's rare that a fee would be imposed for an ACH credit, it's not prohibited. It would be a mistake to make a sweeping statement that banks don't charge.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8