From the Document: "Farm bills, like many other pieces of legislation, have become more complicated and politically sensitive, and are taking longer to enact than in previous decades. Legislative delays have caused the past two farm bills to expire for short periods and to be extended. Expiration again may become an issue unless Congress passes a new farm bill by September 30, 2013. The most recent farm bill expiration was in 2012, when the 2008 farm bill (the Food, Conservation, and Energy Act of 2008, P.L. 110-246) expired without being reauthorized, since the House did not consider a committee-reported farm bill in 2012. The 2008 farm bill began expiring on September 30, 2012 and some programs ceased new operations during the fall of 2012. The Supplemental Nutrition Assistance Program (SNAP) expired also, but was continued via appropriations action. An outdated and expensive 'permanent law' would have been resurrected for the farm commodity price support programs on January 1, 2013. But the American Taxpayer Relief Act of 2012 (P.L. 112-240) extended all 2008 farm bill provisions that were in effect on September 30, 2012, for one additional year until September 30, 2013. In the case of the farm commodity programs that are on a different implementation calendar than the fiscal year, the extension includes all of the 2013 crop year, which for certain dairy programs lasts until December 31, 2013. Crop insurance is permanently authorized and did not expire."
CRS Report for Congress, R42442