Medicaid Community-Based Attendant Services and Supports Act of 2005 - Amends title XIX (Medicaid) of the Social Security Act (SSA) to require State Medicaid plan coverage of community-based attendant services and supports for certain Medicaid-eligible individuals.

Outlines requirements for: (1) an enhanced Federal medical assistance percentage (FMAP) for ongoing activities of early coverage States that enhance and promote the use of community-based attendant services and supports; and (2) increased Federal financial participation for certain expenditures incurred by the State for the provision of such services and supports.

Directs the Secretary of Health and Human Services to: (1) award grants to eligible States which have established a Consumer Task Force to assist the State in its development of real choice systems change initiatives; and (2) conduct a demonstration project for the purpose of evaluating service coordination and cost-sharing approaches with respect to the provision of community-based services and supports to non-elderly dually eligible individuals.