Taxpayers must be 18 years old, not enrolled in school full-time, not claimed as a dependent on someone else's return, and not have an adjusted gross income above a certain amount, which will be defined. It's also important to note that some "retirement plan distributions ("Plan")" may reduce the amount of contribution considered for the credit. For 2009, the credit can be claimed by taxpayers filing jointly with gross adjusted incomes up to $55,500, individually with an income up to $27,750, or as Head of Household with an income up to $41,625. It's important to remember that the adjusted gross income must include any foreign earned income and housing costs, as well as income for residents of Somoa and Puerto Rico.