To accurately determine the correct amount of Massachusetts withholding, employers will rely on Massachusetts Form M4. II. General Description of Services and Definitions.Refer to Appendix G "Glossary" and Appendix B, Section 2 for definitions of terms used. This manual will contain Best Practice recommendations based on industry standards. Parent Information: Please fill out completely and sign where indicated. Illinois Secure Choice will provide a simple form for employees to use to change their contribution elections or opt out of the program.