Jurisdictional Tax Parameters
Register your Illinois LLC with the Department of Revenue for sales tax, withholding tax, and other state taxes.
Official State Document Mirror
Clicking download will instantly open the live application form hosted on the official government registry server.
Filing Authority Mapping
To register your Illinois LLC with the Department of Revenue:
- Download Form REG-1 Business Registration Application.
- Complete the form with entity and tax details.
- Submit online via MyTax Illinois or mail to the Department of Revenue.
- Registration is free.
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