itonewbie
Level 15

@treasur2 That is public information and should be no secret.

See Q5: https://support.taxslayerpro.com/hc/en-us/articles/360053794133-FAQ-for-E-Filing-Form-1040X-Amended-...

See "Amending a federal return that you did NOT originally prepare": https://kb.drakesoftware.com/Site/Browse/16841/1040-Generating-an-Amended-Return-Drake19

Not 100% certain about CCH but it seems like they don't have any restriction either: https://support.cch.com/kb/solution/000093877

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