Section 110(12) in The Central Goods and Services Tax Act, 2017
(12)The President, State President or any Member may, by notice in writing under his hand addressed to the Central Government or, as the case may be, the State Government resign from his office:Provided that the President, State President or Member shall continue to hold office until the expiry of three months from the date of receipt of such notice by the Central Government, or, as the case may be, the State Government or until a person duly appointed as his successor enters upon his office or until the expiry of his term of office, whichever is the earliest.