Internal Revenue Service Contact IRS  |  About IRS  |  Site Map  |  Español  |  Help    Advanced Search   Search Tips Most Requested Forms and Publications 1.   Form W-4 2.   Form W-9 3.   Form 1040 4.   Form 1040 Tax Table 5.   Publication 17 More Forms and Publications Online Tools Where's My Refund It's quick, easy and secure Search for Charities Find an eligible charity. Online options - fast, free Electronic payment options. More Online Tools Check Out Tax Law Changes Get a brief peek at some of the 2005 tax law changes that affect charitable donations, dependent children and retirement plans. Help for Hurricane Victims Various tax relief provisions apply to victims of this record hurricane season. Tax Settlement Offered Abusive tax transaction settlement initiative launched. Taxpayers have