The name must contain the word "corporation," "company," "incorporated," "limited" or an abbreviation of one of these terms. After you have formed your entity, usually an LLC or corporation, you'll need to file Form 2553 with the IRS to request S Corp status.The first step to starting an S corp in Texas is to check your business name availability. Your business entity's name must be unique. Where to file your taxes for Form 1120-S ; A foreign country or U.S. possession. Establishing an S Corp in Texas involves forming a formal business entity, meeting IRS requirements, and filing Form 2553 with the IRS.