Maker shall maintain a system of accounting and reserves in accordance with GAAP, has filed and shall file each tax return required of it, and has paid and shall pay when due, unless disputed in good faith by Maker, each tax, assessment, fee, charge, fine and penalty imposed by any taxing authority upon it or any of its assets, income or franchises, as well as all amounts owed to mechanics, materialmen, landlords, suppliers and the like in the normal course of business.