Line 10 of 1040-SR is Qualified business income deduction. My TT Premium form 1040-SR is placing $20.00 here. I am retired, I have no business. Is this correct?

There are other income items that may trigger this such as a K-1, Box 5 of Form 1099-DIV for a REIT.

You probably have a 1099-DIV with an amount in box 5 which makes you eligible for the QBI.