Taiwan stocks ended 2.06 percent lower on Thursday, the biggest single-day percentage fall in over three months, tumbling after a government tax reform panel decided to discuss later this year the idea of a tax on profits from stock investment. The main TAIEX index fell 165.41 points to 7,872.66, after opening down 0.5 percent. It was the biggest single-day percentage loss since December 19. The Taiwan dollar was up by T$0.009 to trade at T$29.561. Foreign investors were net buyers on Wednesday, bringing their total buying to T$31.85 billion this month.