N.Y.C. Admin. Code § 5-505: § 5-505 When the director of management and budget is to prepare departmental estimate.

If a departmental estimate is not submitted on such date as the mayor may direct, the director of management and budget shall cause to be prepared such estimate and data necessary to include departmental estimate in the budget for such agency for the following fiscal year. In no event later than the fifteenth day of January, or such earlier date as the mayor may direct, the director of management and budget will forward copies of such estimate to the secretary of the board of estimate, the council and each community board and borough boards.