One more follow up -
I already had net losses for the tax years 2014 and 2015. Do I still need to create the 1040X for those years? So, my net loss carryback from 2019 would show $0 used in 2014 (no net changes on the 1040X), $0 used in 2015, and then some used for 2016 to 2018 until it is used up? Also, to confirm the timeline, I would have the 3 years from the due date of the 2019 tax return to file these 1040X documents, right?
If I'm manually completing the form 1040X's, I enter the appropriate tax year at the top and check the box on line 1 (which, presumably, allows me to modify a tax year after the 3 year window has expired), correct? Is there anything to say the changes are due to a 2019 loss carryback (as opposed to 2018 or 2020)?
