<prompt> Human: I have spent the last two years working for the government United States and contributing to my Thrift Savings Plan TSP each paycheck. I have recently switched to a private company and have setup one of their 401k plans with Principal. I have the option to leave my TSP money in the TSP, withdraw it, or transfer it to my new employers plan. I dont want to withdraw it but I am unsure of whether or not to leave it in the TSP. Does anyone have thoughts or experience with this?x200B;I can no longer make contributions to the TSP plan from my paycheck but apparently I may be able to make transfers from the 401k to the TSP. I am not sure how that would work but it is supposedly possible. I am in my mid 20s so retirement is pretty far off and I might be overthinking this but I would appreciate any advice. Thanks.  <response>: Not only do you keep the TSP, but whenever you change jobs going forward, you rollover the 401k into the TSP. 