Photographs of missing children. The Internal Revenue Service is a proud partner with the National Center for Missing and Exploited Children. Photographs of
                        missing children
                        selected by the Center may appear in this publication on pages that would otherwise be blank. You can help bring these children
                        home by looking at the
                        photographs and calling 1-800-THE-LOST (1-800-843-5678) if you recognize a child.
                        
                     
                   
                     
                     The federal income tax is a pay-as-you-go tax. This means you must pay the tax as you earn or receive income during the year.
                        
                     
                     As a wage earner, you pay federal income tax by having it withheld from your pay during the year. This is your “withholding.” Your withholding
                        is based on the number of allowances you claim when you file Form W-4, Employee's Withholding Allowance Certificate, with
                        your employer.
                        
                     
                     The purpose of this publication is to help you check your withholding and, if necessary, prepare Form W-4 to adjust your withholding.
                        When you
                        first begin a job, you must complete a Form W-4 and give it to your employer to establish your initial withholding. You can
                        adjust your withholding by
                        filing a new Form W-4 with your employer at any time.
                        
                     
                     Note.
                                If you have not changed jobs, you do not have to file Form W-4 each year unless you need to adjust your withholding.
                        
                        
                                For more detailed information about Form W-4, see Publication 505, Tax Withholding and Estimated Tax.
                        
                        
                      
                     Comments and suggestions.
                                We welcome your comments about this publication and your suggestions for future editions.
                        
                        
                                You can write to us at the following address:
                        
                        
                           
                              
Internal Revenue Service
                              
Individual Forms and Publications Branch
                              
SE:W:CAR:MP:T:I
                              
1111 Constitution Ave. NW, IR-6406
                              
Washington, DC 20224
                           
                         
                        
                        
                                We respond to many letters by telephone. Therefore, it would be helpful if you would include your daytime phone number,
                        including the area code, in
                        your correspondence.
                        
                        
                                You can email us at
                        
*taxforms@irs.gov. (The asterisk must be included in the
                        address.) Please put “
Publications Comment” on the subject line. Although we cannot respond individually to each email, we do appreciate your
                        feedback and will consider your comments as we revise our tax products.
                        
                        
                      
                     Ordering forms and publications.
                                Visit
                        
www.irs.gov/formspubs to download forms and publications, call 1-800-829-3676, or write to the address below and receive a response
                        within 10 business days after your request is received.
                        
                        
                           
                              
National Distribution Center
                              
P.O. Box 8903
                              
Bloomington, IL 61702-8903
                           
                         
                        
                        
                      
                     Tax questions.
                                If you have a tax question, visit
                        
www.irs.gov or call 1-800-829-1040. We cannot answer tax questions sent to
                        either of the above addresses.
                        
                        
                      
                     Nonresident Aliens. 
                                Nonresident alien employees, before completing Form W-4, should see the instructions for Form 8233, Exemption from
                        Withholding on Compensation for
                        Independent (and Certain Dependent) Personal Services of a Nonresident Alien Individual.