There's nothing on your tax return that says it is a RMD. The 1099R isn't coded or says it's the RMD. When you enter the 1099R in Turbo Tax and you are over a certain age it will ask you if it was for the RMD. That's only to check if you took it and it's the right amount or you have to pay a penalty if you didn't take out the RMD or not enough. And it needs to know if it was the RMD so you can't roll it over to another account or convert it to a ROTH account.
