There is a 30-percent federal investment tax credit (ITC) for solar energy systems in place until December 31st, 2016. Both residential and commercial customers can take advantage of this tax credit, and it applies to all three major types of solar technology; photovoltaic, solar heating & cooling, and concentrating solar technology.
In addition to the federal ITC, many states, counties, municipalities and utilities offer rebates or other incentives for solar energy technologies. Your installer will be able to provide the most up-to-date information on solar incentives. The Database of State Incentives for Renewables & Efficiency (DSIRE) has a comprehensive list of solar incentives by state, as well as more information and maps showing solar policies across the U.S.