Illinois Certification for Exemption is a document issued by the Illinois Department of Revenue that confirms an organization's exemption from state sales tax. It is typically used by businesses that qualify for a sales tax exemption under Illinois law. There are three types of Illinois Certifications for Exemption: General Exemption Certificate, Religious Exemption Certificate, and Government Exemption Certificate. The General Exemption Certificate is issued to organizations that are exempt from Illinois sales tax according to the Illinois Revenue Code. This includes organizations such as churches, non-profit organizations, educational institutions, and certain governmental entities. The Religious Exemption Certificate is issued to organizations that are exempt from Illinois sales tax because of their religious purpose and activities. The Government Exemption Certificate is issued to organizations that are exempt from Illinois sales tax because they are an agency, department, or instrumentality of the United States, the State of Illinois, or any of their political subdivisions.