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I have changed organization entity types. How do I change this with IDOR?
- registering electronically using MyTax Illinois;
- completing and mailing Form REG-1, Illinois Business Registration Application; or
- visiting a regional office.
When your business changes organization entity types (e.g., from a sole proprietorship to a corporation) and is required to get a Federal Employer Identification Number( FEIN) or a new FEIN, you must re-register with IDOR by:
If you are able to keep your FEIN, you will need to fill out the paper version of the Form REG-1, Illinois Business Registration Application and attach proof of organization type and FEIN (IRS letter LTR-147C or CP 575), because the owner/officer information we require is different for different entity types.