No way anyone could tell you for sure..
IF you have children, and received advance child tax credits....could just be the letter specifying how many $$ they sent you during 2021, so that you can enter the proper amount in your tax return. (some folks are terrible at keeping track) . But other than that, could be most anything.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
