Publication 919, How Do I Adjust My Tax Withholding?
The purpose of this publication is to help you check your withholding and, if necessary, prepare a new Form W-4 to adjust your withholding. When you first start a new job, you must fill out a Form W-4 and give it to your employer to establish your initial withholding. You can adjust your withholding by giving a new Form W-4 to your employer at any time.
Other Items You May Find Useful:
Form W-4, Employee's Withholding Allowance Certificate
Comment on Publication 919
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