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Proposed Regulations for Section 199 Deduction
The US Treasury Department has released proposed regulations interpreting Internal Revenue Code Section 199.

Tax Information For Corporations
Get tax information for large and mid-size corporations from the IRS web site.

Instructions for Forms 1120 and 1120-A (2004)
IRS instructions for corporate income tax returns filed on Form 1120 and 1120A.

IRS Form 1120, Corporation Income Tax Return [PDF]
IRS Form 1120, Corporate Income Tax Return, in PDF file format. Requires Adobe Reader.