- OCI Headquarters: (609) 588-5017 Representatives are available Monday through Friday, 8:30 am until 4:30 pm (excluding State holidays).
- 24-Hour Recorded Tip Line: (609) 588-5001 (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)
N.J. Department of the Treasury
Office of Criminal Investigation
P.O. Box 284
Trenton, N.J. 08695