STAMP DUTY RESIDENTIAL CONCESSION RATE (s147).
 
If the property has a residence a concessional rate of stamp duty applies. This rate applies to principal places of residence (ie owner/occupier), rental homes and holiday homes.

$0 to $120K 1.9% of purchase price.
$120K to $150K $2,280.00 + 2.85% on portion over $120K.
$150K to $360K $3,135.00 + 3.8% on portion over $150K.
$360K to $725K $11,115.00 + 4.75% on portion over $360K.
$725K plus $28,453.00 + 5.15% on portion over $725K.

Examples

Purchase Price Stamp Duty
$200K $5,035.00
$300K $8,835.00
$360K $11,115.00
$400K $13,015.00
$500K $17,765.00
$600K $22,515.00
$725K $28,452.50
$800K $32,315.50
$900K $37,465.50
To calculate exact stamp duty go Office of State Revenue website at www.dtf.wa.gov.au and click on "duties ready reckoner".