Thank you @DoninGA for the links.
My question was regarding Turbotax Free edition which claims $0 Federal $0 State for Simple returns and I was not sure if Simple returns also meant some income limits. I guess the answer is No.
I think the other information you provided that with 1099-INT > $1500 one would need Sch-B which is not supported in the free edition is also something crucial to remember.
