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@IRonMaN wrote:

You can't create a correct amended return if your starting point isn't the same as what the latest filed return shows. 

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That is not true. For example, you need to amend a return where the taxpayer filed form 1040 but should have filed 1040-nr or vice versa. There is no starting point and we do not need the starting point, just follow the process I described in the previous post in this thread.