Dawn55
Level 2
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Actually for filing a superseding return it does.  The extension was filed in March, the return in May; therefore a superseding return would be filed up to the due date of the extension.

Per the IRS link I previously referenced: 

superseding return is a return filed subsequent to the originally-filed return and filed within the filing period (including extensions).

An amended return is a return filed subsequent to the originally-filed or superseding return and filed after the expiration of the filing period (including extensions).

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