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Level 2

Question

1040X attachment

Forum|Forum|1 month ago
May 6, 2026
1 reply
12 views

I received a corrected 1099B that caused me to amend my e-filed return. I am finished with the amended return and ready to re efile but i see no way to attached the corrected 1099B. How do i attached the revised 1099B to the 1040X efile?

Alumni - Expert

Alumni - Expert

You do not need to attach your corrected Form 1099-B when e-filing your Form 1040-X. TurboTax automatically includes the updated 1099-B information when you transmit your amended return. You should indicate in the Tell us why you're amending your return section of TurboTax that you received a corrected Form 1099-B and indicate what has changed.

Please see this TurboTax help article for more information: How do I amend my federal tax return for this year?

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Level 15

Include new or corrected 1099-B only if it show federal withholding and only if you are filing 1040-X by mail.