The Karnataka Assembly polls will be held on May 12 and the votes will be counted on May 15, Chief Election Commissioner O P Rawat announced today. There will be a single phase election for the 224-member assembly, like the last time. The notification for the polls will be issued on April 17 and the last date for filing of nomination will be April 24, Rawat said at a press conference. April 27 will be the last date of withdrawal of candidates, he added.