It depends on the industry. In most of the service industry, companies would grow, advertise more, and hire new employees. However, in manufacturing it would likely result in a lots of lost jobs. The main reason that automation hasn't taken all manufacturing jobs is that investing in robots requires a expensive upfront investment. Smaller manufacturers cannot afford the upfront cost of automation, even though robots become profitable after a short amount of time. Cutting the corporate tax rates would make automation far more affordable for smaller manufacturers and lead to a loss of jobs.