How to Import W2 Data to File Form W2C & W3C Quickly
As an employer, you need to file W2 & W3 forms each year. If you discover an error, you may need to file Forms W-2c (Corrected Wage and Tax Statement) and W-3c (Transmittal of Corrected Wage and Tax Statement) as soon as possible.
ezW2 software speeds up W2C and W3C filing with data import options
If your data is saved in Excel file, you can convert it easily by clicking Excel top menu "File", then click "Save As" to save it as .csv (comma delimited) file.