This chapter reviews legal instruments and avenues available for planning support for people with cognitive impairments in Australia, including adult guardianship, durable powers of attorney, representative payee and nominee appointments, and special needs disability trusts; the associated public institutions such as guardianship tribunals, office of the public advocate, and public trustees; and their interaction with service delivery programs such as the National Disability Insurance Scheme and social security. It is argued that the configuration of planning instruments, and the timing of their introduction, reflects adaption to the architecture of its welfare state, including its somewhat unique combination of extensive access to tightly means-tested income support (and reforms to overcome tax minimisation or avoidance), the absence of any expectation of family support, and acceptance of state responsibility for funding of services for disabled people least able to care for themselves.