Forms Search name Document Name 2016 CD-401S S Corporation Tax Return Instructions 2016 NC K-1 CD-401S Shareholders Share of NC Income, Adjustments, and Credits 2019 CD-401S S-Corporation Tax Return Instructions 2019 CD-405 C-Corporation Tax Return 2019 CD-405 C-Corporation Tax Return Instructions 2019 CD-405 CW Instructions for Combined Corporate Income Tax Worksheet 2019 CD-418 Cooperative or Mutual Association 2019 CD-425 Corporate Tax Credit Summary 2019 CD-429 Corporate Estimated Income Tax 2019 NC-K1 CD-401S Shareholders Share of Income, Adjustments, and Credits 2019 S-Corporation Tax Return