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IRS.gov Website
Publication 919
How Do I Adjust My Tax Withholding?
Introduction, Useful Items and Important Changes
For use in 2011

Checking Your Withholding

Why Should I Check My Withholding?
When Should I Check My Withholding?
How Do I Check My Withholding?
What If Not Enough Tax Is Being Withheld?
What If Too Much Tax Is Being Withheld?

Adjusting Your Withholding

How Do I Increase My Withholding?
How Do I Decrease My Withholding?
When Will My New Form W-4 Go Into Effect?
IRS Review of Your Withholding
Retirees Returning to the Workforce

How To Get Tax Help