A 401(k) plan is an employer-sponsored retirement plan that will allow you to invest for retirement with pre-tax income. What happens to your 401(k) if you decide to change employers or retire? Well, that decision is ultimately made by you. You could leave the money in the old 401(k) plan, roll it over into an IRA, take it with you to a new plan, or cash out the account. Let’s take a look at these options just in case you ever find yourself in this situation.