Withholding Tax Forms and Instructions To ensure you are able to view and fill out forms, please save forms to your computer and use the latest. Information about Form W4, Employee's Withholding Certificate, including recent updates, related forms and instructions on how to file.New employees must complete Form W4, Employee's Withholding Certificate. Employers and employees can learn how to fill out Form W-4 here. Complete Form W-4 so that your employer can withhold the correct federal income tax from your pay. Give Form W-4 to your employer. Click Bookmarks in the top left corner, then hover over. CMS Employee Self-Service. Starting a new job or need to change the amount of withholding from your paycheck? The employer agrees not to withhold payment, or require officers to sign any contracts or forms that were not submitted at the time of application.