The forms avaialbility chart (Which could change again) says
1) FOR PRINTING & MAIL-filing purposes ONLY
............10 Feb for the D400, but 17 Feb for a bunch of other NC forms that might be needed to feed into it.
2) For E-Filing Purposes
......24 Feb
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But dates could change again any day....they already changed from 2 or 3 days ago that suggested 17 Feb for everything.
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North Carolina Individual Forms Availability (intuit.com)