N.Y.C. Charter § 225: Section 225. Budgetary responsibilities of the mayor, the director of management and budget and the comptroller.

a. The mayor shall each year, in accordance with the provisions of this chapter, prepare and submit to the council a preliminary budget and an executive budget each of which shall present a complete financial plan for the city and its agencies for the ensuing fiscal year, setting forth proposed operating and capital expenditures, proposed interfund transfers, anticipated revenues and any other anticipated sources and uses of funds. Each such budget shall consist of three parts: the expense budget, which shall set forth proposed appropriations for the operating expenses of the city including debt service; the capital budget and program, which shall set forth proposed appropriations for capital projects for the ensuing fiscal year and the three succeeding fiscal years; and the revenue budget, which shall set forth the estimated revenues and receipts of the city.

b. There shall be an office of management and budget in the executive office of the mayor, the head of which shall be director of management and budget who shall be appointed by the mayor. It shall be the duty of the director to perform all such duties in regard to the budget and related matters as the mayor may direct. The director of management and budget shall have the power, personally or through representatives, to survey each agency for the purpose of ascertaining its budgetary requirements. The director may require any agency, or any officer or employee, to furnish data and information and to answer inquiries pertinent to the exercise of any of the director's duties in regard to the budget and related matters.

c. The comptroller shall produce timely analyses of the preliminary and executive budgets including evaluations of the recommendations of the borough presidents, as well as those of the mayor, and of the assumptions and methodologies used by the mayor in making the revenue estimates contained in such budgets.