The West Australian government will hand over control of the National Disability Insurance Scheme to the Commonwealth.
The NDIS had been run by the state under the previous Barnett Liberal National government, the only Australian state to do so.
Joining the national NDIS scheme will mean about 15,000 more West Australians get support on top of an existing 25,000, and between 8000 and 10,000 jobs will be created, doubling the size of the sector, Premier Mark McGowan and Social Services Minister Christian Porter said on Tuesday.
"The reason for doing this was the interests of people with disabilities, giving them confidence over their lifetimes," he told reporters.
"It provides more support for more people, more jobs and more choice."
The national scheme allowed people entitled to funding to make their own decisions about their own care, WA Disability Services Minister Stephen Dawson said.
That was different to the arrangements historically in place at a state level, where a provider was imposed on people, he said.
Those who miss out on the NDIS will still be looked after by state government services, he said.
The scheme will be phased in from April next year.
