1009B and supplemental document

Filing by mail. If I enter each stock type line by line, do I have mail the 1099B and the supplemental forms in?

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If you enter every transaction by hand, you do not need to mail the 1099B and supplemental forms in. If you choose instead to report a summary by type then you do need to mail in the supplement.

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I just found the E*trade supplemental info with the adjusted cost basis for my 2023 vested RSUs. Should I amend my 2023 return to fix the cost basis ($0) that I reported?

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