States and cities where the IRS is holding problem-solving days this Saturday. The IRS urges taxpayers to call ahead for appointments _ at 800-829-1040 _ so staff can research and expedite cases, but appointments aren't required.

Arizona: Phoenix

California: Laguna Nigel, Los Angeles, Oakland, San Jose

Colorado: Denver

Connecticut: Hartford

Florida: Jacksonville, Fort Lauderdale

Georgia: Atlanta

Illinois: Chicago

Indiana: Indianapolis

Louisiana: New Orleans

Maryland: Baltimore

Massachusetts: Boston

Michigan: Detroit

Minnesota: St. Paul

Missouri: St. Louis

New Jersey: Newark

New York: Brooklyn, Manhattan in New York City; Buffalo

North Carolina: Greensboro

Ohio: Cincinnati

Oklahoma: Oklahoma City

Pennsylvania: Philadelphia

Tennessee: Nashville

Texas: Austin, Dallas, Houston

Virginia: Richmond

Washington: Seattle

Wisconsin: Milwaukee