The current date for amended forms in TurboTax is March 26. You can check IRS forms availability table for TurboTax individual (personal) tax products.
The IRS has not said yet how they will handle catch up payments for the third stimulus. Filing an amended will show you are eligible. The IRS may send corrected payments or it may be part of the 2021 return, much as the first and second stimulus catch-ups were paid out as an additional refund. At this point the Service is focused on sending out initial payments while also handling tax returns.
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