The Tax Commission does not mail forms for filing corporate taxes. Get forms at tax.utah.You may file your withholding returns online at tap.utah.gov. You must include your FEIN and withholding account ID number on each return. Want to incorporate in Utah? Learn how to structure your business, file the required documents, choose a name, and more. Corporations file Schedule M-3 (Form 1120) to answer questions about their financial statements and reconcile financial statement net income (loss) State and Federal Taxes. Utah state filing information for taxexempt organizations. This kit includes detailed steps to walk you through all three steps of forming an S corporation, and examples of what the completed forms should look like.