If you used TurboTax, you can access your return by logging in using the same TurboTax account that you used to file your previous return. Please see How do I access a prior-year return? for instructions.
You may need to enter “0” for the AGI on your tax return. Please see this Help Article for more information and to see if any of these situations apply to you.
If you find that you need to file for an extension, please see this Help Article for instructions.
If you need additional assistance, please feel free to contact Customer Support.
@midhenry
