I double check the information. And, I may do 10k of side jobs during the year, I don't change anything. They are going after 2016 returns and now more years following. I'm thinking there is a Turbotax bug that leaves a box unchecked or something else small.
I sent them in the 568 doc and canceled check showing payment for amount on 568, didn't work. They kept sending me threating letters saying I owed $0.00 and penalties. Doesn't make sense.
I already sent them the 568 and copy of cancelled check. Crickets. They keep claiming I owe them $0.00 and are demanding payment and penalties. I included a check for the requested amount and penalties based on their formula.