You will require this registration if you intend to offer a service as an authorised marriage celebrant. Marriage celebrants are appointed by the Commonwealth. This registration includes marriage celebrants who perform civil ceremonies to solemnise marriage and also marriage celebrants who perform religious ceremonies for the independent religious body or organisation (that hasn't been proclaimed as a recognised denomination).
Separate approval to operate as a minister of religion is done via the State and Territory Registrars of Births, Deaths and Marriages.
You may apply to the Registrar of Marriage Celebrants for an exemption from paying the registration application fee if you live in a remote area where there is no more than one marriage celebrant.
Please consult the Contact Officer for more information.