Form RT-12 or the "Request For Determination Of Proper Tax Jurisdiction" is a form issued by the Illinois Department of Revenue.
The form was last revised in April 1, 2010 and is available for digital filing. Download an up-to-date Form RT-12 in PDF-format down below or look it up on the Illinois Department of Revenue Forms website.
Step-by-step Form 12 instructions can be downloaded by clicking this link.
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