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@sjrcpa wrote:

When there's a 1099-B you enter the payer's ID?

Why?

Or is it a ProSeries thing like requiring the EIN for a state tax refund 1099-G?

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No, none of that is needed in ProSeries.  It is there for those who want to do it (just like a 1099-MISC or 1099-NEC).  Or more to the point, it is for TurdoTaxer's to enter a form and ProSeries uses the same base programming.