The Secretary of Agriculture may collect commodity assessments from the proceeds of a marketing assistance loan for a producer if the assessment is required to be paid by the producer or the first purchaser of a commodity pursuant to a State law or pursuant to an authority administered by the Secretary. This collection authority does not extend to a State tax or other revenue collection activity by a State.

The collection of an assessment under subsection (a) of this section shall be made as specified in an agreement between the Secretary of Agriculture and the State requesting the collection.