Where to file your taxes for Form 1120-S ; A foreign country or U.S. possession. (You must give last name, then first names).Also list the person's social security number. You can get in-person help at your local IRS Taxpayer Assistance Center. Call for an appointment after you find a Taxpayer Assistance Center near you. Corporate income tax filers use form TC-20. Want to incorporate in Utah? Learn how to structure your business, file the required documents, choose a name, and more. 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. Utah state filing information for taxexempt organizations.