Article 61 Chicago Convention
Budget and apportionment of expenses
The Council shall submit to the Assembly an annual budget, annual statements of accounts and estimates of all receipts and expenditures. The Assembly shall vote the budget with whatever modification it sees fit to prescribe, and, with the exception of assessments under Chapter XV to States consenting thereto, shall apportion the expenses of the Organization among the contracting States on the basis which it shall from time to time determine.
See also: Article 60 Chicago Convention