Missouri Revised Statutes Title XVIII. Labor and Industrial Relations § 285.304. Content of withholding forms

The content of the withholding form shall be determined by the director of the department of revenue, in consultation with the department of social services, but, at a minimum, the form shall include the name, address and Social Security number of the employee, the date services for remuneration were first performed by the employee, and the name and address of, and identifying number assigned to the employer under Section 6109 of the Internal Revenue Code of 1986, as amended. If the employer chooses to submit a form other than the federal W-4 withholding form, the form shall also include the date the employee signed the W-4 form or the date the employer hired the employee as defined in section 285.300.