IRS.gov - Federal income tax forms and resources.
California Tax Service Center - California State income tax forms and resources.
The Volunteer Income Tax Assistance/Tax Counseling for the Elderly (VITA/TCE) programs provide free assistance to individuals with limited income and/or over the age of 60 who need help in completing simple federal and state income tax returns. Find a site.
Tax Help – A comprehensive resource for all your tax needs.