@handdrops
But...
1) did you actually submit that 2016 tax form? Either by mail, or by e-filing?
2) did you just fill out the data, but not actually send it in yet?
3) ....and when ? what calendar year did you fill in the data from 2016. in 2017? or 2018? or recently in 2019?
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
