Reserve Bank of India Act, 1934
26. Legal tender character of notes
(1) Subject to the provisions of sub-section (2), every bank note shall be legal tender at any place in India in payment or on account for the amount expressed therein, and shall be guaranteed by the Central Government.
(2) On recommendation of the Central Board the Central Government may, by notification in the Gazette of India, declare that, with effect from such date as may be specified in the notification, any series of bank notes of any denomination shall cease to be legal tender save at such office or agency of the Bank and to such extent as may be specified in the notification.