When workers switch jobs, what happens to their 401ks and the funds that are in it? What should workers do with their old 401k? What are some common misconceptions about how 401ks are transferred over? What are the biggest mistakes workers make with the 401k when switching jobs? What should they do to make sure their funds are transferred in a way to avoid penalties or fees? Requirements: Financial planners, retirement experts, human resource specialists. Please include your name, job title, and company.