If you filed with TurboTax, you will need to log into the same account that was used last year. If you do not see previous years in your Tax Timeline, you may have multiple accounts under the same email address (see link below). If you used our Federal Free product you will need to purchase PLUS benefits to retrieve that information (PLUS benefits must be purchased yearly in order to receive benefits) or you may request your tax transcript directly from the IRS: https://www.irs.gov/individuals/get-transcript.
If you believe there are more than one account, you may want to try the account recovery process: https://myturbotax.intuit.com/account-recovery/
https://ttlc.intuit.com/replies/5574744
