Taiwan stocks fell 1.8 percent on Tuesday, underperforming regional shares, with heavyweight HTC Corp shedding 6.8 percent, the maximum allowed in a day. The main TAIEX index closed down 131.7 points at 7,136.05, after opening flat. Electronics shares lost 1.6 percent, while banking shares were off 1.8 percent. The Taiwan dollar was up T$0.040 at T$29.050.