Franchise tax reports are due on May 15 each year. If May 15 falls on a Saturday, Sunday or legal holiday, the next business day becomes the due date.Avoiding common negotiating mistakes when buying or selling a business in Texas is essential for a smooth transaction. What businesses need to know about completing a sales tax return in Texas: how to prepare a return and when to file to stay compliant. Before you buy an existing business, find out if the business owes any Texas taxes. Business taxes are extremely low in Texas, and there is no personal income tax. This gives Texas two distinct competitive advantages over many other states. This comprehensive "checklist for buying a business in Texas," which spans from meticulous due diligence to the conclusive agreements. When buying an existing business in Texas, there are several important factors that every investor should consider. You are engaged in business if you or your independent salespersons make sales, leases or rentals, or take orders for tangible personal.