Government Sites

IRS Withholding Calculator
The purpose of this application is to help employees to ensure that they do not have too much or too little income tax withheld from their pay. It is not a replacement for Form W-4, but most people will find it more accurate and easier to use than the worksheets that accompany Form W-4. You may use the results of this program to help you complete a new Form W-4, which you will submit to your employer.

Internal Revenue Service
United States Department of the Treasury, Internal Revenue Service.

Franchise Tax Board
State of California Franchise Tax Board

Online Tax Payment Sites

Federal Tax Payment Site

California State Tax Payment Site