I have developed a new responsive website(http://www.calc.net.au) using asp.net mvc5 and bootstrap for hosting web based tax tools such as vehicle stamp duty calculator.
This website serves as a common place for all the types of AU tax calculators and their web API’s. It will host other calculators ASAP like mortgage calculator, property stamp duty etc. and still under development.
I have deployed web based vehicle stamp duty calculator on this website and can be accessed directly with url http://www.calc.net.au/vehicle/stampduty
Here few screen shots