I want to sell my products in every country in the world for a fixed tax rate on all my products. How can I do this?
In order to setup a fix tax rate,you need to follow process::
- Add New Attribute with the attribute settings select Fixed Product Tax from the drop-down menu Catalog Input Type for Store Owner
- Assign that attribute to Attribute Sets
- Add tax to product from manage product
- By default, fixed product taxes are disable so in addition to all the above things you also need to enable fixed product taxes. To do this go to System menu > Configuration > Tax button in the Sales section on the left > Fixed Product Taxes panel on the right. Then set the Enable FPT drop-down menu to Yes. and click on the Save Config
See more detail here