Thank you for your post. I just spent more than two days trying to figure-out the problem. No help from Intuit at all. Support line is overloaded and online support just spinning. TurboTax does not indicate why the return can not be e-filed - just "Federal return must be linked or attached as a PDF", but there is no way to attach a PDF.
By the end of today, I was suspecting that the problem is the Federal E-File requirement. However, I can not E-File the F1120 because it needs an unsupported form 5472 that TurboTax does not support. So I am screwed. I can't believe that they gave you the advise to "just deal with it and pay the penalty". This is absolutely ridiculous and completely unacceptable!
