Try this for working out your calculations.
http://amun.osr.qld.gov.au/sap/osrqld/wd_ltax_calc
Some rough figures on 2 scenarios below
Scenario 1
If you have $650,001 in your own name and buy a $350,001 UCV property
Land Tax payable $4,516.15
Scenario 2
If you have $650,001 in your own...