I need to find out if I filed taxes last year

If you are unsure, we offer a number of ways to assist you in recovering access to your account if one exists.

Go to our account recovery page. https://myturbotax.intuit.com/account-recovery/
Enter either your:
Phone number (recommended)
Email Address
UserID
Follow the on-screen instructions.

You will either be sent a code to help you recover your account or be given a list (through email or on screen) of possible accounts associated to your information. We will list the recommended account for you at the top of that list.

If you are still unable to recover your account after trying these steps, please select the link that says Try Something Else. You will be guided to enter additional information to help identify the right account and several questions to verify your identity.

Once you are signed into your account, we recommend you add or update your phone number. This will increase your account security and make future account recovery attempts easier.

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You can order a transcript of a previous year's return from the IRS here: https://www.irs.gov/individuals/get-transcript