State income tax on November ballot Posted in: News In 1993, Texas voters approved the Texas Income Tax Proposition 4, also known as the Texas Income Tax Amendment. Proposition 4 was on the Nov. 2, 1993, ballot in Texas as a legislatively referred constitutional amendment, where it was approved. The measure prohibited a personal income tax without voter approval.PLEASE LOG IN FOR PREMIUM CONTENT. Our website requires visitors to log in to view the best local news. Not yet a subscriber? Subscribe today!