To access your 2015 tax return follow the instructions below. If you paid for TurboTax this year, you can download every return until October 2018. If you didn't pay to file this year, you need to upgrade and pay for TurboTax before you can download old tax returns.
I have used Turbo tax since 2014 and have always paid for the extra services
If you filed your 2015 tax return with TurboTax, you can access your return from Documents section, on the left menu of your TurboTax home screen. If you still can't access it that way, you can use the link provided below to get a transcript from the IRS:
i am trying to view my 2015 tax return. what is the problem
For assistance with accessing your 2015 return, please see the TurboTax Help Article How do I access a prior-year return?
If you are still not able to access your return, please comment with specific details regarding the issue you're experiencing so we can further assist you.