Ind. Code § 8-1-2.8-13

Sec. 13. Unless the commission disapproves an application by the InTRAC for a surcharge adjustment within ninety (90) days of the application, the commission shall approve the adjustment, and the LEC may charge and collect an adjusted surcharge. However, the commission may not approve an adjustment that results in a monthly surcharge that exceeds forty cents ($0.40) per residential or business line (or line equivalent).