1Annual contributions to the general account and to each separate account shall be levied only as required to make payments by the account in question.
2Annual contributions payable pursuant to articles 18, 19 and article 21, paragraph 5 shall be determined by the Assembly and shall be calculated in accordance with those articles on the basis of the units of contributing cargo received or, in respect of cargoes referred to in article 19, paragraph 1(b), discharged during the preceding calendar year or such other year as the Assembly may decide.
3The Assembly shall decide the total amount of annual contributions to be levied to the general account and to each separate account. Following that decision the Director shall, in respect of each State Party, calculate for each person liable to pay contributions in accordance with article 18, article 19, paragraph 1 and article 21, paragraph 5, the amount of that person’s annual contribution to each account, on the basis of a fixed sum for each unit of contributing cargo reported in respect of the person during the preceding calendar year or such other year as the Assembly may decide. For the general account, the above-mentioned fixed sum per unit of contributing cargo for each sector shall be calculated pursuant to the regulations contained in Annex II to this Convention. For each separate account, the fixed sum per unit of contributing cargo referred to above shall be calculated by dividing the total annual contribution to be levied to that account by the total quantity of cargo contributing to that account.
4The Assembly may also levy annual contributions for administrative costs and decide on the distribution of such costs between the sectors of the general account and the separate accounts.
5The Assembly shall also decide on the distribution between the relevant accounts and sectors of amounts paid in compensation for damage caused by two or more substances which fall within different accounts or sectors, on the basis of an estimate of the extent to which each of the substances involved contributed to the damage.