That should be fine. They have to declare the rental income as income, and if it's a pure rental property, pay GST as well. Tax authorities already audit for un

That should be fine. They have to declare the rental income as income, and if it's a pure rental property, pay GST as well. Tax authorities already audit for unusually low rental rates vs market. The rent on a 1m house is likely in the 50k+ range, and the taxes on that will exceed the 10k no-occupancy fee. Problem solved.