SavnanahOne is correct in that you need to look at state law. You could not do what corkygirl's bank is doing in IN either.
What, when and how you charge the "prepayment penalty", and that's what it is regardless what you call it, will be governed by state law.
As long as the prepayment penalty can only be charged if the borrower closed the account then it does not have to be disclosed in the plan disclosure. BUT if you can charge the fee if you close the account for any reason then it does.
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The opinions expressed are mine and they are not to be taken as legal advice.