A properly-formatted standard/plain 2020 1099-R form does not normally use boxes 12 & 13, but now only 14, 15, and sometimes 16 for the state data entries.
A 2020 CSA- or CSF-1099-R form from OPM, still do use boxes 12 and 13 for state withholding and state identity entries.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
