E-Filing 2024 business returns is not supported by TurboTax Business. You'll need to print and mail the necessary pages. Basically, this includes the main return form (1065, 1120S, etc.) plus any other forms that are new to the return or that have changed since the original filing. Be sure to write "Amended return" at the top of all pages.
See also: https://www.irs.gov/instructions/i1065x
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