After you file

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@mesquitebean wrote:

You didn't go far enough.   In the left menu column click on Tax Tools, which then displays a submenu. 

Then in the submenu choose Tools.

In the Tools popup window, there should be a link to "Delete a form."

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Thank you, however there's no such link.

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@mesquitebean wrote:

Ideally, it should have been saved to your computer first as a backup prior to starting the amended return.  

I agree in hindsight, but nowhere did Intuit make it clear that the one and only tax file would be permanently modified by a tentative amendment (that we expect can be cancelled).

I can't imagine why they would not preserve the filed .tax file-- other than to save storage space at the cost of losing their customer's data...