215 ILCS 5/24
When the Director has been notified that the capital required by the articles of incorporation has been fully subscribed, and that such capital and the required surplus has been fully collected, he shall conduct an examination of the company. If he finds that the organization of the company is complete, that the required capital provided in the articles of incorporation and required surplus has been fully collected and deposited with the designated bank or trust company, that the deposit provided for by section 26 has been made and that all of the requirements imposed by this Code, have been met, he shall issue to the company a certificate of authority to transact the kind or kinds of business specified therein. No company shall transact any business of insurance until it has received a certificate of authority as herein prescribed nor any business of insurance not specified in such certificate of authority.
215 ILCS 5/24