Yes...you can.
The calc and withdraw of the RMD for any TSP must be done completely separate, from the calculation/withdraw for IRAs .
One thing I was not aware of , until I did it, is that in the year you turn 70.5, the divisor used for the RMD depends on your age at the end of the same year you turn 70.5. Example: IF you turn 70.5 in 2020, and also turn 71 by the end of 2020, then the RMD divisor is different than if you didn't turn 71 until 2021. But I talked about it with the phone-Rep for my 401k, and when my calc didn't match theirs, I found out why then , and they did the proper calculation for me
Certainly, for that first year you can delay the first one until the first few months of 2021...but then you end up taking two RMDs in 2021 and that ends up with a pretty large tax bump for 2021 taxes
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
