N.Y.C. Admin. Code § 15-107: § 15-107 Grades of members of the uniformed force.

Members of the uniformed force, upon appointment, shall be assigned to the fourth grade; after one year of service in the fourth grade they shall be advanced to the third grade; after one year of service in the third grade, they shall be advanced to the second grade; after one year of service in the second grade, they shall be advanced to the first grade; and they shall in each instance receive the annual pay or compensation of the grade to which they belong.