I just accidentally efiled a return instead of the extension. Can I undo it if it's just received by Intuit ?

[itonewbie]

No, you can't.  Your only hope is that the return gets rejected.  Otherwise, you'll need to file an amended return.

[IRonMaN]

DeLorean time 

[Quinn-you-boys]

How to amend without knowing original information?

[IRonMaN]

You can’t.  But if you don’t know the original numbers how would you know you need to amend?

[Quinn-you-boys]

Because, 6 months later when I went to efile the actual return, the status reported the return had been accepted back on the day I MEANT to extend.

[IRonMaN]

Get an IRS transcript to see what is in their system.