If you are not careful about the validity period of your visa, it could lead to a lot of issues

Why Australia is a 'long way' from tracking down 75,000 visa overstayers. The Department of Home Affairs estimates there are 75,400 unlawful non-citizens in Australia. There are around 980 people held in immigration detention facilities, 200 of them are overstayers. A total of 86,929 individuals had not been granted a Protection Visa and had not yet been deported at the end of the period.

Migrant worker Alex* is detained at Sydney’s Villawood Immigration Detention Centre for overstaying his visa. Source: Getty / Getty Images

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