After you file

In order to access your prior years' returns, you would need to upgrade your account to Plus. Once your account has been upgraded, you will see all of your previous returns filed with TurboTax. The following TurboTax FAQ explains how to do so.

https://ttlc.intuit.com/replies/5574744

You can also get a copy of your return by doing the following;

• Order a free tax return transcript online or by mail from the IRS that has a lot (but not all) of the information from the return. Some people may not be able to do this.
• Pay the IRS $50 for an exact copy of your return.