How can I get a submission confirmation number for a past return?

[rjs]

Do you mean the Submission ID? You have to call TurboTax support to get it.

[VolvoGirl]

Do you need proof you filed?  If you efiled, In the PDF of your TurboTax return, the last page of the federal return should be an "electronic postmark" that shows your name, Social Security number, the date and time that you e-filed the return, and the date that the IRS accepted it.

Check the efile status.  When you efile you get back 2 emails.  The first email only confirms the transmission.  The second email says if the IRS (or state) Accepted or Rejected your efile.  And check your spam folder for them.

When you log into your account you should also see the status and if it was Accepted or Rejected, Started, Printed, Ready to Mail, etc.  What does it say?