Fees are calculated for invoices - for certain payment. You need a tables, e.g.
tblInvoices:InvoiceID, CustomerID, InvoiceDate, ...;
tblInvoiceRows: InvoiceRowID, InvoiceID, RowType, RowQty, OneAmount;
, where RowType differs between service price, discount, Government Fee, etc. RowQty is for case, when you deliver multiple of same service to customer. OneAmount is amount for single quantity, and is entered manually (e.g. for discount when this is irregular), or is calculated in subform of invoices form according RowType. And you need a table/tables, where are stored all parameters needed to calculate amounts for every RowType