TurboTax retains the current and the prior 7 years of tax returns completed using the online editions, the same retention timeframe as the IRS.

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

Scroll down to the section Your tax returns & documents.  Click on the Year and Click on Download/print return (PDF)

If you used the desktop CD/Download editions installed on your computer, the only copy of your tax data file and any PDF's will be on the computer where the return was created.  TurboTax does not store online any returns completed using the desktop editions.

Or go to this IRS website for free federal tax return transcripts - https://www.irs.gov/individuals/get-transcript

For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506 - http://www.irs.gov/pub/irs-pdf/f4506.pdf

You can sign up for an account on the IRS website and that will gain you access to all previously filed tax returns

@Creepyconsequence Actually, you can get free transcripts of your past tax returns, up to about ten years.   If you want an actual copy of the tax return, there is a fee of $43 per return.   So---save copies yourself for your own records to avoid having to pay for them.

A transcript is not a "copy" of the return, but it shows the information that was on the return.

https://www.irs.gov/individuals/get-transcript

Or you can pay the IRS $43 for an actual copy of your tax return which will include copies of your W-2’s     

https://www.irs.gov/pub/irs-pdf/f4506.pdf