Solved
Turbo Tax says it comes from "Interest Income Smart Worksheet (Schedule B)", but I cannot find that form in my TurboTax list of forms.
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IT is the sum of any box 8 $$ on any 1099-INT forms you entered....(sometimes lowered a bit by any box 13 $$ on the same 1099-INT form)
PLUS
any box 12 $$ on any 1099-DIV forms you entered.
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Occasionally there can be some added amounts from a Schedule K-1 form you might have entered...but having a K-1 is much rarer situation
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