(1) Requirement. The rules of this section are applicable, except as otherwise expressly provided, to any alien who departs from the United States or any of its possessions after January 20, 1961. Except as provided in subparagraph (2) of this paragraph, no such alien, whether resident or nonresident, may depart from the United States unless he first procures a certificate that he has complied with all of the obligations imposed upon him by the income tax laws. In order to procure such a certificate, an alien who intends to depart from the United States (i) must file with the district director for the internal revenue district in which he is located the statements or returns required by paragraph (b) of this section to be filed before obtaining such certificate, (ii) must appear before such district director if the district director deems it necessary, and (iii) must pay any taxes required under paragraph (b) of this section to be paid before obtaining the certificate. Either such certificate of compliance, properly executed, or evidence that the alien is excepted under subparagraph (2) of this paragraph from obtaining the certificate must be presented at the point of departure. An alien who presents himself at the point of departure without a certificate of compliance, or evidence establishing that such a certificate is not required, will be subject at such departure point to examination by an internal revenue officer or employee and to the completion of returns and statements and payment of taxes as required by paragraph (b) of this section.