Apportionment: While there is no formal definition of the term "apportionment" as the term most often used is "assessment", it should be noted that Article 17(2) of the Charter states that "The expenses of the Organization shall be borne by the Members as apportioned by the General Assembly."
Appropriation: The amount voted by the General Assembly for a financial period against which expenditures may be incurred. For the regular budget, the appropriations are voted by the Assembly broken down by each section of the budget. Unspent appropriations are surrendered back to Member States
Assessment: The amount of money which the General Assembly determines should be assessed to finance the approved appropriation, shared among Member States in accordance with the scale of assessment. Letters of assessment for the regular budget are sent to Member States by 1 January of each year.
Commitment authority: Authority given by the General Assembly to the Secretary-General to incur expenditures without an appropriation. The authority is usually given for emergency situations, pending detailed review of budgetary proposals.
Financial Period: The financial period is as follows:
(i) Regular budget and tribunals - Two consecutive calendar years, the first of which is an even year;
(ii) Peacekeeping operations – 1 July current year to 30 June next year.
Contingency Fund: Level of resources, set at 0.75 per cent of the overall level of the outline which can be added to the budget to accommodate additional expenditures arising from programme budget implications of mandates or revised estimates of activities not foreseen in the proposed programme budget.
Peacekeeping Reserve Fund: The Peace-keeping Reserve Fund was established in 1992, at a level of $150 million, as a cash flow mechanism to ensure the rapid response of the Organization to the needs of peace-keeping operations.
Working Capital Fund: The Working Capital Fund was established in 1946 to provide advances necessary to finance budgetary appropriations, pending the receipt of contributions, and to finance unforeseen and extraordinary expenses pending appropriation action by the General Assembly. In 1982 the level of the Fund was set at $100 million, and in July 2006 the General Assembly decided that the level should be increased to $150 million effective 1 January 2007.