<prompt> Human: Sorry if this seems like a dumb question but I have no one in my family to teach me about things like this. I have money in my 401k from my previous job and I can view it on a website called fidelity. Since I quit my job do I just leave it there? Do I withdraw it? The company is sprint, will the merger with T-mobile affect it?  <response>: You have three options, one is to leave it where it is, one is to roll it into an IRA, one is to see if you can roll it into your current jobs 401k. Which one to pick depends on how good your previous 401K is, how good your new one is, and if neither of them are that great, going into an IRA.This mostly involves management fees, expense fees, and available fund selections.If all you do is put your money into a 2050 plan, its not going to make much difference which one you pick. If you are just going to put it into a SP 500 fund, probably just go with Vanguard IRA to get free ETF transactions and low expenses.There really is no way to tell based on the description youve given, what your best choice is.The only way a merger will affect your 401k is if the other companys 401K is chosen as the one that all employees use. 