@AkinaLO, You're an export? Then you should know better and know that a 4464c letter is not an audit but an automated algorithm by the IRS system that randomly pulls peoples returns to broad check tax filers to see how people are filling and if people are filing correctly (not an audit). But let's talk about how in 2020 a large % of turbotax users are getting flagged by this algorithm system and having to wait 60days. Seems to me like turbotax is sending in the filing system in a way that is triggering the coding in the IRS algorithm type to pull these accounts.
