Childhood Adoption Act of 2005 - Amends the Internal Revenue Code to: (1) increase the tax credit for adoption expenses from $10,000 to $15,000; (2) make such tax credit refundable; and (3) increase the exclusion from gross income for employer-paid adoption expenses from $10,000 to $15,000.
Amends title IV, part E (Federal Payments for Foster Care and Adoption Assistance) of the Social Security Act to increase: (1) levels of adoption incentive payments payable to States under the adoption assistance program; and (2) funding for adoption incentive payments for FY 2006 through 2008.