A penalty shall not be assessed on an additional tax assessment made by the Administrator when a return has been filed in good faith and the tax paid thereon within the time prescribed by the Administrator. In the absence of fraud, neither penalty nor interest shall be assessed on any additional tax assessment resulting from a Federal audit, provided an amended return is filed and the additional tax is paid within three months after a final determination of the Federal tax liability. (Ord. 1971-19. Passed 11-22-71.)