Formation of Business Entities and Nonprofit Corporations Under the Texas Business Organizations Code: Online filing available through SOSDirect. To start an S corp in Texas, a small business must first form a business structure, such as a limited liability company (LLC) or a C corporation.By choosing to be taxed as an S-Corp, LLCs or Corporations need to fill out and file Form 2553 of the IRS. Expert Filing Service – Hire us to form your corporation for you, so you can focus on running your business. Form 966 Corporate Dissolution or Liquidation is the IRS form that must be filled out when closing down an S corporation. Use Swyft Filings to start an LLC, corporation, or other business entity in under 10 minutes. Answer a few simple questions and let us handle the paperwork. The standard forms included with S-Corp filing are 1120S and Schedule K-1. If an S-corp has employees, a Form 940, Form 941 or Form 1099 may also be required. Articles of Entity Conversion (Corporation to Nonprofit Corporation) (PDF, 1.5MB).