Formation of Business Entities and Nonprofit Corporations Under the Texas Business Organizations Code: Online filing available through SOSDirect. "Facilitate business acquisitions with our Letter of Intent template.This article covers how Texas business purchase legal services can help you navigate these challenges. Before you buy an existing business, find out if the business owes any Texas taxes. Before an offering or sale of a business opportunity in. Texas, the principal seller must register the business opportunity with the secretary of state. Tex. Drafting a purchase agreement for buying or selling a business in Texas is a critical step to ensure a smooth transaction. These instructions are provided to assist in properly completing the. Texas Sales and Use Tax Return and supplements. Drafting a purchase agreement for buying or selling a business in Texas is a critical step to ensure a smooth transaction.