Borrower and each of its Subsidiaries has to the best knowledge of Borrower after due investigation filed all tax returns and reports required by law to have been filed by it and has paid all taxes and governmental charges thereby shown to be owing, except any such taxes or charges which are being contested in good faith by appropriate proceedings and for which adequate reserves in accordance with GAAP shall have been set aside on its books or which the failure to file or pay could not reasonably be expected to have a Material Adverse Effect.