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You need to create tax categories relevant to the type of the goods being purchased.
after creating the tax categories you need to associate it with the product. 
​​​​​​​Then at the time of ordering the tax details will be shown in order summary before order confirmation.

Thank you for the quick response, but I would like to display the price included the taxes in the product publisher and product detail portlet. So the customer knows the
total price. Is that possible?