Right now we assume that the Price of the Item includes the taxes ... therefore we haven't added taxes in the end-user bill. We add delivery fee and market fee and calculate the Net-Payable.
But as you say ... if its needed we can add taxes ... in the bill ... and its not so much difficult to integrate that ...
I will be glad to see more contributions to the project ... i believe one of the best advantages of open-source is that people can share and collaborate openly !
You should check the related laws to produce compliant bills.
I don't know about the US and its various state laws, but in my country, such pieces of informations are mandatory on bills. Well, there are different forms of bills, and also there are different requirements depending on the amount charged; but anyway all these are things you should study in order to publish a piece of software which produces bills which conform to local laws. Some governments can get really picky when it comes to the main or a major source of their income (VAT and such other taxes) and possible fraud indicators.
But as you say ... if its needed we can add taxes ... in the bill ... and its not so much difficult to integrate that ...
I will be glad to see more contributions to the project ... i believe one of the best advantages of open-source is that people can share and collaborate openly !