If you did a 2018 tax return and it has been processed by the IRS, you should be able to find a transcript of the return on this IRS web site: https://www.irs.gov/individuals/get-transcript
If you think you used the TurboTax online product to do it, you can look on your TurboTax accounts. You may have more than one. Here is a link to find accounts: https://ttlc.intuit.com/community/account-management/help/how-many-turbotax-accounts-do-i-have/00/26...
