7 C.F.R. § 983.71

(a) Each handler who receives pistachios for processing in each production year, except as provided in § 983.58, shall pay the committee on demand, an assessment based on the pro rata share of the expenses authorized by the Secretary for that year attributable to the assessed weight of pistachios received by that handler in that year.

(b) The committee, prior to the beginning of each production year, shall recommend and the Secretary shall set the assessment for the following production year, which shall not exceed one-half of one percent of the average price received by producers in the preceding production year. The committee, with the approval of the Secretary, may revise the assessment if it determines, based on information including crop size and value, that the action is necessary, and if the revision does not exceed the assessment limitation specified in this section and is made prior to the final billing of the assessment.