Q. Do I need to send my W2-c to Illinois also?
A. No. And you do not need to amend IL
Q. Do I need to file an amendment and send it to IRS for federal return?
A. No, and you do not need to amend the federal return.
Q. When sending the W2-c, do I send the complete page with one return, or do I tear one small section like the main W2?
A. Tear off the section indicated for the state return.
Your situation is straight forward since only the county income tax was affected. In Indiana, the county income filing tax is part of the state return.
