This Form 1040, U.S. Individual Income Tax Return, is the standard "long form" tax return, which must be used by all filers not eligible to use Form 1040A or 1040EZ.
The files are in Adobe Portable Document Format (.pdf), and you will need the free Acrobat Reader to view and print the files.
Download:
Form 1040, U.S. Individual Income Tax Return
Instructions for Form 1040, U.S. Individual Income Tax Return