As of January 22, 2021, IBKR will withhold state taxes for the following states.
- Alabama
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Georgia
- Idaho
- Indiana
- Illinois
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- Utah
- Virginia
- Vermont
- Washington DC
- West Virginia
- Wisconsin