Complete a certificate of insurance. Fill out the insurance form that matches the type of service you provide.These sample letters can be used in various circumstances you may encounter that require you to communicate with insurance companies. Insurance Filing and Forms. Insurance can be confusing. Get a fast, free quote for your small business now. Listing of all TDI forms. Please complete both pages of this form. Certificates are used to show proof that an organization or person has insurance coverage. View and search certificates.