Tax Information Sites
Catalyst Business Service
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The IRS website has many great tax resources for you

IRS W4 Form 
This form is used to determine federal income tax withholding

INS I-9 Form 
This form is required to be filled out by new employees on their date of hire for the Immigration and Naturalization Service
This site offers downloadable Federal and State tax forms. You may also link to all 50 states to learn more about their taxes and download forms from them
A site geared for the tax professional, but also useful for laypersons looking for late-breaking tax news, tax calculators, and articles about tax law

American Institute of Certified Public Accountants 
Committed to member service and the public interest, the American Institute of Certified Public Accountants and its predecessors have been serving the accounting profession since 1887

California City and County Sales and use Tax Rates
This page at the California State Board of Equalization maintains a listing of tax rates for cities and counties in California

California Franchise Tax Board - Forms and Publications 
From this site you can download California State tax forms from the Franchise Tax Board

Internal Revenue Service - Forms and Publications
From this site you can download virtually any IRS form and/or instructions or publication  

Tax Sites Directory...A Guide To Tax Resources on the Internet 
This well-designed and maintained site offers the Tax Help, Tips & Updates section includes links to many online tax guides