OCI Headquarters (for criminal matters only): 609-322-6914 Representatives are available Monday through Friday, 8:30 am until 4:30 pm (excluding State holidays).
24-Hour Recorded Tip Line: 609-322-6057 (For citizens who wish to report suspected tax violations or allegations of poor conduct or behavior by New Jersey Taxation personnel or other Department of Treasury employees)
By Mail:
N.J. Department of the Treasury
Office of Criminal Investigation
P.O. Box 284
Trenton, N.J. 08695
Division of Taxation