Filed form 1120...received a notice that we did not file form 4626...Turbo Tax Business did not calculate of produce this form...where is the update for this?

See https://care-cdn.prodsupportsite.a.intuit.com/forms-availability/turbotaxbusiness_fed_windows_corp.html

Not supported

"If you filed form 1120, there's a question on schedule K line 29c that triggers the filing requirement for 4626. I incorrectly checked no (meaning not exempt/safe harbor) & received the same request as you (my C corp is tiny)"....

The Fix??? (at least for me...)

"I'm planning on filing an amended return & responding with a cover letter saying I checked the wrong box."

Wish I could take credit for this, but it's seagull672 who gets the credit for helping me with this same issue.

Good luck,

Al

And if you do not have  K1?

Sounds like you are getting two different forms mixed up... Not a "K1", but rather your "Schedule K," it is part of your 1120 just after the "schedule J." I think it's on page 5 of your Form 1120. Double check, and you'll see "line 29c." Change it from "NO" to a "YES." Read it, you'll see that it triggers form 4626. 

Happy filing!!

Al