Section 245BB of the Income Tax Act
Section 245BB of the Income Tax Act: Vice-Chairman to act as Chairman or to discharge his functions in certain circumstances
(1) In the event of the occurrence of any vacancy in the office of the Chairman by reason of his death, resignation or otherwise, the Vice-Chairman or, as the case may be, such one of the Vice-Chairmen as the Central Government may, by notification in the Official Gazette, authorise in this behalf, shall act as the Chairman until the date on which a new Chairman, appointed in accordance with the provisions of this Chapter to fill such vacancy, enters upon his office.
(2) When the Chairman is unable to discharge his functions owing to absence, illness or any other cause, the Vice-Chairman or, as the case may be, such one of the Vice-Chairmen as the Central Government may, by notification in the Official Gazette, authorise in this behalf, shall discharge the functions of the Chairman until the date on which the Chairman resumes his duties.