A TSP Is the same as a 401k, so the distribution adds into lines 5a,5b.
Yes, if over age 72, you do have to make sure you get the RMD from it every year, but that must be calculated separately. Usually the Administrator of the account can tell you each year what that RMD amount will be....but I don't know what help the TSP program provides for determining that amount each year.
_____________________________________
...or...did you roll or transfer your TSP account into an IRA account? that's a different situation, and then it's no longer a TSP.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
