Best practice? File your state with your federal return. See below to find your state’s Department of Revenue due-date.

Alabama

4/15/2010

 

Arizona

4/15/2010

 

Arkansas

4/15/2010

 

California

4/15/2010

 

Colorado

4/15/2010

 

Connecticut

4/15/2010

 

Deleware

4/30/2010

 

DC

4/15/2010

 

Georgia

4/15/2010

 

Hawaii

4/20/2010

 

Idaho

4/15/2010

 

Illinois

4/15/2010

 

Indiana

4/15/2010

 

Iowa

4/30/2010

 

Kansas

4/15/2010

 

Kentucky

4/15/2010

 

Louisiana

5/15/2010

 

Maine

4/15/2010

 

Maryland

4/15/2010

 

Massachusetts

4/15/2010

 

Michigan

4/15/2010

 

Minnesota

4/15/2010

 

Mississippi

4/15/2010

 

Missouri

4/15/2010

 

Montana

4/15/2010

 

Nebraska

4/15/2010

 

New Hampshire

4/15/2010

 

New Jersey

4/15/2010

 

New Mexico

4/15/2010

 

New York

4/15/2010

 

North Carolina

4/15/2010

 

North Dakota

4/15/2010

 

Ohio

4/15/2010

 

Oklahoma

4/15/2010

 

Oregon

4/15/2010

 

Pennsylvania

4/15/2010

 

Rhode Island

4/15/2010

 

South Carolina

4/15/2010

 

Tennessee

4/15/2010

 

Utah

4/15/2010

 

Vermont

4/15/2010

 

Virginia

5/1/2010

 

West Virginia

4/15/2010

 

Wisconsin

4/15/2010