In December 2010, the US Congress extended the soon-to-expire Federal Tax Credit for installation of qualifying energy-efficient home improvements. The provision was extended for 2011 with some modifications to eligibility requirements, and reductions in the cap to $500 per home, and 10% of installed cost for qualifying equipment.
For more information click this link to the Metal Roofing Alliance website:
http://www.metalroofing.com/v2/content/guide/costs/energy-tax-incentive.cfm