Assessments will be imposed on sector participants in the receiving sector or the importing sector or both as specified in an approved Council charter. Assessment rates will be based on value that may be expressed in monetary units or units of weight or volume.

(a) An assessment on sector participants in the receiving sector will be in the form of a percentage of the value or a fixed amount per unit of weight or volume of the fish described in the charter when purchased by such receivers from fish harvesters.

(b) An assessment on sector participants who own fish processing vessels and harvest the fish described in the charter will be in the form of a percentage of the value or on a fixed amount per unit of weight or volume of the fish described in the charter that is no less than the value if such fish had been purchased by a receiver other than the owner of the harvesting vessel.

(c) An assessment on sector participants in the importing sector will be in the form of a percentage of the value that an importer pays to a foreign supplier, as determined for the purposes of the customs laws, or a fixed amount per unit of weight or volume, of the fish or fish products described in the charter when entered or withdrawn from warehouse for consumption, in the customs territory of the United States by such sector participants.

(d) A Council may not impose an assessment on any person that was not eligible to vote in the referendum establishing the Council by reason of failure to meet the requirements specified under unless that person, after the date on which the referendum is held, meets the requirements of section.

(e) Any person may make voluntary payments or in-kind contributions to a Council for purposes of assisting the Council in carrying out its functions.