(a) Supplemental income benefits are calculated quarterly and paid monthly.
(b) Subject to § 408.061, the amount of a supplemental income benefit for a week is equal to 80 percent of the amount computed by subtracting the weekly wage the employee earned during the reporting period provided by § 408.143(b) from 80 percent of the employee’s average weekly wage determined under § 408.041, 408.042, 408.043, 408.044, 408.0445, or 408.0446.

(c) For the purposes of this subchapter, if an employee is offered a bona fide position of employment that the employee is capable of performing, given the physical condition of the employee and the geographic accessibility of the position to the employee, the employee’s weekly wages are considered to be equal to the weekly wages for the position offered to the employee.