Employers are required to file W-2 Forms (Wage and Tax Statements) for each of their employees. Employees whom have had income, Social Security and Medicare taxes withheld from their pay. A W-3 form is required to be filed with the W-2 Forms. A W-3 Form is a transmittal summary. This form gives a total amount and number of the W-2 forms being filed. W-2/W-3 forms are filed with the Social Security Administration not the Internal Revenue Service. At this time the SSA requires any employer filing more than 250 W-2 Forms to file those forms electronically versus mailing paper forms. When generating W-2 forms it is your responsibility to make sure the name and number of each employee matches. SSA does have a social security number verification system.