2006 New York Code - Additional Fees Or Compensation Not To Be Paid.

 
    § 17. Additional  fees  or  compensation not to be paid. No officer of
  the city, except corporation counsel, a justice of a city court,  acting
  as  clerk  of  said  court, city marshal, marshal of a city or municipal
  court, commissioners of deeds and city officers acting as  commissioners
  of deeds, shall have or receive to his use any perquisites, compensation
  or  fees  for  services  pertaining directly or indirectly, or which may
  hereafter be added to the duties of  his  office,  in  addition  to  his
  salary;  and all perquisites, compensation and fees paid to and received
  by any such officer for services pertaining directly or  indirectly,  or
  which may hereafter be added to the duties of his office, other than his
  salary  received  from  the city, shall be the property of the city, and
  shall be paid by the officer receiving the same into the city  treasury.
  The  compensation  of  all  the officers, clerks and subordinates in the
  several departments shall not exceed in the aggregate the  appropriation
  made by the board of estimate and apportionment for that purpose.