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IDOI encourages the companies to use the NAIC OPTins system to help facilitate the processing of quarterly estimated tax, annual premium tax and annual renewal fee filings. IDOI does request once a company starts using OPTins to make such filings, the company continues to do so for ease of record keeping and auditing purposes.  Utilizing  OPTins allows a company to schedule submission of filings prior to or on the due date.  A company will need to allow at least 3 weeks for setting up an account in the OPTins system.  To obtain detailed information and setting up an account visit http://www.optins.org/