The 5 digit self-selected efile Pin will be included in the Federal Information worksheet, shown on Page 4 of the worksheet. The worksheet is included in the PDF of the tax return that you can download if you used the online editions.
To access your current or prior year online tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com
Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show. Click on the Year and Click on Download/print return (PDF)
