Don't know......IF TTX allows it to be e-filed....it will just sit on their Servers until NC DOR allows submissions to their servers....and once you e-file it, you cannot get it back for any corrections.....
Safer to just wait until after 3 Feb to e-file NC...you may get some more tax forms in the mail you "forgot" about.
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And even if NC takes your submission from TTX sooner as a test file, they claim they won't do anything with them until 3 Feb.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
