Here is what I am planning on doing if form 8915F  is not ready on March 17th. On the 1099r enter the total amount receive     and the taxable amount as the one third amount. Fore a code mark it code 2 so no penalty is computed and that will give you the answer you are looking for on the federal 1040. Now what efffect this will have on your state return will be another matter depending on what state you are filing. I would feel more comfortable if form 8915F was available by 3/17/21 so we will not have to do this.