Each handler shall pay to the Committee, upon demand, his pro rata share of the expenses which the Secretary finds will be incurred, as aforesaid, by the Committee during each crop year less any amounts credited pursuant to § 989.53. Such handler's pro rata share of such expenses shall be equal to the ratio between the total raisin tonnage acquired by such handler during the applicable crop year and the total raisin tonnage acquired by all handlers during the same crop year.

Each handler who reconditions off-grade raisins but does not acquire the standard raisins recovered therefrom shall, with respect to his assessable portion of all such standard raisins, pay to the Committee, upon demand, his pro rata share of the expenses which the Secretary finds will be incurred by the Committee each crop year. Such handler's pro rata share of such expenses shall be equal to the ratio between the handler's assessable portion (which shall be a quantity equal to such handler's standard raisins which are acquired by some other handler or handlers) during the applicable crop year and the total raisin tonnage acquired by all handlers.

The Secretary shall fix the rate of assessment to be paid by all handlers on the basis of a specified rate per ton. At any time during or after a crop year, the Secretary may increase the rate of assessment to obtain sufficient funds to cover any later finding by the Secretary relative to the expenses of the Committee. Each handler shall pay such additional assessment to the Committee upon demand. In order to provide funds to carry out the functions of the Committee, the Committee may accept advance payments from any handler to be credited toward such assessments as may be levied pursuant to this section against such handler during the crop year. The payment of assessments for the maintenance and functioning of the Committee, and for such purposes as the Secretary may pursuant to this subpart determine to be appropriate, may be required under this part throughout the period it is in effect, irrespective of whether particular provisions thereof are suspended or become inoperative.

Each handler shall, with respect to administrative assessments not paid within 30 calendar days of the date of the Committee's invoice, pay to the Committee interest on the unpaid assessment at the rate of the prime rate established by the bank in which the Committee has its administrative assessment funds deposited, on the day that the administrative assessment becomes delinquent plus 2 percent; and further, that such rate of interest be added to the bill monthly until the delinquent handler's assessment plus applicable interest has been paid: Provided, That the Committee may, with the approval of the Secretary, modify the interest rate applicable to delinquent handler's assessment through the establishment of applicable rules and regulations.