I got the same thing. Telling me that I made a mistake on my 2018 taxes and that I owed $900 plus interest! How can they charge me interest if they’re just telling me now that there was a problem? And why would they wait this long to tell me there was a problem. Oh yeah, probably because I won’t be able to go back and try to amend it since it’s now over three years ago. Had they told me before April 15 then I could have. Very low down and dirty
