In SA you don't have to give reason for not renewing a lease at the end of a term (ie. no need to claim maintenance/reno issues etc). If they're on periodic, the same 60 day notice without reason Nathan mentioned applies. We've gotten rid of a couple nuisance tenants like this.
Didn't realise that, thanks Steve. That's a nice little option to have. There is that option in Vic (ie no reason), but it is 120 days.