City of Sydney Relationships Declaration
Other institutions such as the Registry of Births Deaths and Marriages no longer accepts an Australian Marriage Certificate as a form of ID – this creates an equal situation for both opposite sex and same sex couples as both are not allowed to present their relationship certificates as a form of ID.
Australian Certificate of Identity
The Australian Certificate of Identity (COI) is a biometric travel document issued by the Department of Foreign Affairs and Trade to individuals who are not Australian citizens and are about to leave Australia or one of its territories.