Gujarat Provincial Municipal Corporations Act, 1949
(1) In the event of non-acceptance of office by a person elected to be a councillor, or of the death, resignation, disqualification or removal of a councillor during his term of office, there shall be deemed to be a casual vacancy in the office, and such vacancy shall be filled as soon as conveniently may be, and, in any case, within [15 months] of the date on which it is known that such vacancy has occurred, by the election of a person thereto, who shall hold office so long only as the councillor in whose place he is elected would have been entitled to hold it if the vacancy had not occurred: Provided that no election shall be held for the filling of a casual vacancy if general elections are due to be held within six months of the occurrence of the vacancy: [Provided, however, that such vacancy of a councillor in any Corporation, if any, existing on the date of coming into force of the Gujarat Local Authorities Laws (Second Amendment) Act, 2015, if could not be filled within such period of six months, the same shall be filled in at the time of the general elections if the same are to be held on or before the 31st December, 2015, for constituting the other Corporations whose term are due to expire.] (2) The provisions of section 18 shall apply to an election hold for the filing of a casual vacancy.