2017 CD-401S S-Corporation Tax Return 2017 CD-401S S-Corporation Tax Return Documents 2017 CD-401S S-Corporation Tax Return Related Content 2017 CD-401S S-Corporation Tax Return Instructions 2017 NC-NA Nonresident Shareholder Agreement 2017 NC-K1 CD-401S Shareholder's Share of Income, Adjustments, and Credits 2017 CD-425 Corporate Tax Credit Summary