How do I save the 1040 as a PDF?

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https://ttlc.intuit.com/turbotax-support/en-us/help-article/print-file/print-copy-tax-return-turbota...

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https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/save-2021-turbo...

If you have filed your federal tax return and it has been accepted by the IRS -

To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/

When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state. 

This will take you back to the 2022 online tax return.

Click on Tax Tools on the left side of the online program screen.  Then click on Print Center.  Then click on Print, save or preview this year's return.  

Choose the option Include government and TurboTax worksheets