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The Trust is a "Grantor Trust" "Irrevocable Trust Agreement". The Grantor is *living*. The Asset Holder, a Bank, issued the 1099-INTs to the Trust EIN.  So, I need to additionally buy TT Business and file a 1041 U.S. Income Tax Return for Estates and Trusts, correct?  I am assuming the 1041 includes reporting the 1099-INT Interest and determining the Federal taxes owed.  Is that correct?  If so, why is a 'Grantor Trust Letter' or Schedule K-1 needed in addition to the 1041?

Also, for PA, do I file the PA-41 and is that also only accessed through TT Business?

Thank you.