@ The IRS must keep copies of some returns going back years. Turbotax, according to some threads, made an error more than 6 years ago in commuting the AMT carryover, when taxpayers tried to claim the faulty carryover in later yers it was rejected by the IRS. Thus somehow it had to know that the CF was wrong from more than 6 years ago. How can it do that unless it had records.
