In a number of cases, taxpayers fill incorrect information or amount in their tax forms. If you have also filed a tax form with incorrect information, then you will need to fill another form with the corrected information also known as an amended form. To correct the information entered in a W-2 form, taxpayers are required to file W-2 C form before the deadline. In this article, we will show you how to correct the incorrect info entered on a W-2 form and what else you are required to do in case of incorrect W-2 filed. Follow the IRS guidelines to see what info can be corrected on a W-2 C and W-3 C form.