Also called a Bonus Interest, End of Term Payment, Back End Fee or Repayment Fee and not to be confused with a Prepayment fee. A Maturity Fee is payable in cash when a loan is repaid.
Some loans have no maturity fee. Some can have fees near double digits as a substitute for warrants.
This fee is due in the future and is therefore worth less to a lender who is IRR focused than a fee which is paid at closing.
The lender would always prefer taking, say, a 3% fee at closing and no maturity fee to a 1% fee at closing and 2% maturity fee. The maturity fee has a lower present value and return enhancement value to the lender than a closing fee.
Since it is paid in the future the Maturity Fee also carries credit risk which a closing fee does not.