(a) The officer of the Legislature and the officer of the judiciary having administrative control of appropriations to his respective branch shall have exclusive authority for apportionment of appropriations to his respective branch. An apportionment or reapportionment must be in writing. Each such appropriation shall be apportioned not later than 30 days before the beginning of the fiscal year for which the appropriation is available, or not more than 30 days after the approval of the Act by which the appropriation is made available, whichever is later.
(b) Any appropriation available to an agency, which is required to be apportioned under section 3103 of this title, shall be apportioned or reapportioned in writing by the Director of the Office of Management and Budget. The head of each agency to which any such appropriation is available shall submit to the Director of the Budget information in such form and manner and at such time or times as the Director may prescribe as may be required for the apportionment of such appropriation. Such information shall be submitted not later than 40 days before the beginning of any fiscal year for which the appropriation is available, or not more than 15 days after the approval of the Act by which such appropriation is made available, whichever is later. The Director of the Budget shall apportion each such appropriation and shall notify the agency concerned of his action not later than 20 days before the beginning of the fiscal year for which the appropriation is available, or not more than 30 days after the approval of the Act by which such appropriation is made available, whichever is later. When used in sections 3103–3109 of this title, the term “agency” means any executive department, agency, commission, authority, administration, board, or other independent establishment in the executive branch of the government including any corporation wholly or partly owned by the Virgin Islands which is an instrumentality of the Virgin Islands.