Previous Versions of CBP Form 7501 to be Discontinued After 11/3/09

Beginning November 3, 2009, the U.S. Customs and Border Protection (CBP) will no longer accept versions of CBP Form 7501 dated before June 2009. While the June 2009 CBP Form 7501 does not contain any substantial changes from the previous versions, CBP seeks to ensure in particular that forms dated before April 2005 are no longer used. 

CBP forms and their instructions can be accessed here