It depends on which version you used to file your most recent return in:
Don't have access right now? You can get access to your last seven years of returns by paying for PLUS or a 2018 TurboTax Online product*. This gives you access to all your TurboTax Online returns through October 31, 2020.
*TurboTax Live Basic, TurboTax Deluxe, TurboTax Deluxe Live, TurboTax Premier, TurboTax Live Premier, TurboTax Self-Employed, or TurboTax Live Self-Employed
You can get a return transcript from the IRS for free : http://www.irs.gov/Individuals/Get-Transcript
For a $50 fee you can get a copy of the return from the IRS: https://ttlc.intuit.com/questions/1901218-can-i-get-a-copy-of-my-tax-return-from-the-irs