Commitment Fee
A fee lenders charge their borrowers for unused credit or credit that has been promised at a specified future date.
Investopedia Commentary
A commitment fee is different from interest although, the two are often confused. A lender charges a borrower a commitment fee to keep a line of credit open, or to guarantee a loan at a certain future date even though the credit is not being used at that particular time.
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See also: Bank, Credit, Interest, Investment Bank, Line of Credit, Loan, Merchant Bank, Open End Credit, Retail Banking