What Does 401K Rollover Mean? 
That is a great question ! Simply put , a 401k rollover is what you call the action of taking the funds from one 401k and moving them -LRB- or `` rolling them over '' -RRB- into another 401k fund , or similar retirement vehicle . This has to be done in a very timely fashion , or there are tax consequences , and is most commonly done when you switch employers , and want to keep funding the 401k . Thanks for asking ! 