Kammala jumla mai zuwa: Yarjejeniyar Tsarin Mulki ta Australiya ta 1998 ita ce Yarjejeniyar Tsarin Mulki wanda ya taru a Old Parliament House, Canberra daga 2 zuwa 13 Fabrairun 1998. Gwamnatin Howard ce ta kira shi don tattauna ko Ostiraliya ta zama jamhuriya. Yarjejeniyar ta kammala tare da "a ƙa'idar goyon baya" ga jamhuriya ta Australiya (tare da ƙarancin ƙarancin ƙuri'a don ci gaba da mulkin mallaka na Australiya) kuma ya ba da shawarar samfurin da ya shafi nadin shugaban ƙasa ta Majalisar. An sanya samfurin a
kuri'ar raba gardama a watan Nuwamba 1999 kuma 'yan zaben Australia sun ki amincewa da ita.