Elections for up to 11 new city mayors to run councils including Sheffield will be held in November if voters approve the plans.
Communities minister Greg Clark has unveiled the new timetable.
A referendum on the plans is being held in affected cities, including Sheffield, on May 3.
Mr Clark plans for resulting mayoral elections to be held on a ‘Super Thursday’ of November 15 - the same date as polls for around 40 police commissioners.
He said: “Elected mayors provide cities with the strong, visible leadership that can help them prosper nationally and internationally.”
Mr Clark added: “The world’s great cities have mayors who lead their city on the national and international stage, attracting investment and jobs. We believe mayors can help English cities achieve their full potential too.”