Texas has no personal income tax. Sales taxes are 6.25% and can go up to 8.25% in various municipalities. There also is no estate tax.
Corporations don't have a tax, per se. However, there is a franchise tax that applies to all business entities- including partnerships, joint ventures and single member LLCs. For more information on who is taxed please see: http://www.window.state.tx.us/taxinfo/franchise/faq_tax_ent.html