Michigan Form U-4 Instructions are used by employers to register their employees for state income tax withholding. The instructions provide guidance on completing the form, including information on how to calculate the state income tax withholding amount. There are two types of Michigan Form U-4 Instructions: the Michigan New Hire Form U-4 Instructions and the Michigan Amended Form U-4 Instructions. The Michigan New Hire Form U-4 Instructions provide guidance on completing the form for new hires, including information on how to fill out the form, how to calculate the state income tax withholding amount, and how to submit the form to the state. The Michigan Amended Form U-4 Instructions provide guidance on completing the form for employees who have changes to the information previously submitted, including information on how to fill out the form, how to calculate the state income tax withholding amount, and how to submit the form to the state.