A man caring for a teenage girl under the National Disability Insurance Scheme (NDIS) has been charged with sexually assaulting her, then allegedly paying her to stay quiet.

The 28-year-old from Australind, north-east of Bunbury in Western Australia is accused of having a sexual relationship with the 15-year-old between March and November 2020.

It will be alleged that the man was being paid under the NDIS program to support the victim.

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It will also be alleged he paid her $10,000 in December 2020 to cover up the offences.

He has been charged with three counts of sexual penetration of a child between 13 and 16 years old, and one count of having a sexual relationship with a child between 13 and 16.

The 28-year-old is next due to appear before the Bunbury Magistrates Court on February 18.