AccuWage

AccuWage is free software from Social Security Administration and is used with Electronic Filing W-2 - EFW2 (BusinessPlus does not support EFW2C - Electronic Filing of Corrected Wage and Tax Statement.)

The AccuWage software allows you to check W-2 (Wage and Tax Statement) reports for correctness before you send them to Social Security. The software identifies most of the common format errors in wage submissions. Using this software greatly reduces submission rejections. It is strongly recommended that clients take advantage of this software. 

Download information from SSA: http://www.socialsecurity.gov/employer/accuwage/

Install AccuWage for the reporting Tax Year software on your PC.  Then, specify the directory where your electronic file is located.  AccuWage reads the file and informs you of any errors it detects.