Hi there, @mgbizservice.
Allow me to join the thread and help share additional information about the Form 1120 (U.S. Corporation Income Tax Return).
To check and verify if you can still fill out the 2012 Form 1120, I suggest getting in touch with our ProConnect Support to check this further for you.
You can also reach out to our QuickBooks Online Accountant Support. For the support's contact information, you can check it here: How to contact QuickBooks Online Accountant support.
Stay in touch if you have any other questions about the Form 1120. I'll be right here to help you!