When it comes to bank teller positions, there's no specific formal education requirement. Basically, the only educational requirement by most financial institutions is a high school diploma. Banks typically rely on their own on-the-job training for employees. Some larger banks may send their new employees to a company-based training school for a couple of weeks in lieu of training at a local branch office, but this isn't common. Bank tellers are generally expected to have cash-handling experience, customer service skills and mathematical abilities.