Illegal immigration to Australia is defined by the Migration Act 1958, which distinguishes between "lawful non-citizens" (those in Australia holding a valid visa) and "unlawful non-citizens" (those without a valid visa).[1]
Immigration to Australia is administered by the Department of Home Affairs, formerly the Department of Immigration and Border Protection, and before that the Department of Immigration and Citizenship (DIAC).
According to the Australian Bureau of Statistics, the majority of people in Australia illegally are visa overstayers, who enter the country legally but remain there after the expiry or revocation of their visa.[2] DIAC estimated that in the period from 1 July 2009 to 30 June 2010, approximately 15,800 people overstayed their visas out of 4.5 million temporary entrants during that period (about 0.35 per cent). As of 30 June 2010, DIAC estimated that the number of visa overstayers in Australia was around 53,900, or 0.2 per cent of the Australian population.[3]
In 2018, it was reported more than 60,000 foreigners are living illegally in Australia,[4] and by 2021 it was reported that increased to more than 100,000.[5]