Duties and sales taxes are import charges that are a part of government policy for your country. Your country will dictate the charges that are payable by the consumer when importing foreign goods. Sales Taxes are present in most economies and are generally included in the sale price of an item at your local retail store. When purchasing online, the government collects that tax on the way into the country - the seller has not paid them the sales tax because the state of origin is different from the state of destination. Duties are a government charge for importing goods from a foreign place. These are in place as a disincentive to purchase offshore made goods and encourage local spending. Therefore, this charge is the responsibility of the customer (importer) and not Dr Mister (exporter).