Should I sign the contract before 12/31 to be able to get tax credit for FY2009 ?

Thanks

__________________
2010 BMW X5 35d|Order:12/08/2009|Production:12/23/2009| Complete:1/12/2010|Delivery:1/16/2010
2008 BMW 328i|Platinum Bronze Metallic|Bieze|Premium|Xenons|HD|USB|Comfort Access