Question 1 - You can prepare and file Form 1045, Application for Tentative Refund, on or about the time you submit your 2021 amended tax return. Please note that TurboTax does not support Form 1045. TurboTax instructions provide that taxpayers should go the the IRS website, download Form 1045, fill it out, and then mail it to the appropriate IRS office. The IRS instructions for Form 1045 provide that you should mail Form 1045 in a separate envelope and not include it with your return.
Question 2 - No, when you are ready to amend, you can access your previously filed return, in TurboTax online, from the TurboTax home page. Scroll down the screen to the section Your tax return & documents. If you have used TurboTax CD/download, then you can amend your previously filed return by selecting Other Tax Situations, and then scroll down to Other Tax Forms.
Here is a link to a TurboTax article that explains in greater detail the process to amend a previously filed return. How to Amend my Federal Tax Return for a Prior Year
After you begin to amend your 2021 return, TurboTax will ask you to respond to questions relating to what you are changing. Because you are amending your 2021 return to add the carryback loss, you are changing the adjusted gross income you reported for 2021. Continue through the application.
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