The servicer must not charge the borrower administrative fees.
The servicer is authorized to assess late charges during the Trial Period Plan. The servicer must waive all late charges, penalties, stop payment fees, or similar charges upon the borrower's conversion to a permanent mortgage loan modification.
The servicer must follow the procedures in Reimbursement for Expenses Associated with Workout Options in F-1-05, Expense Reimbursement for advancing funds and requesting reimbursement.
For more information please see: D2-3.2-07: Fannie Mae Flex Modification.