 Employers must mail this form to us annually. Form W4MN, Minnesota Withholding Allowance Exemption Certificate. Employees must elect exempt status annually. If the employee makes more than $200 per week and claims exemption, employers must mail this form to the state. Form W4MN. Instructions are also available in Spanish. For more information, you can check out the story on our website. Go to krxam.com. Click under News.