This thread is resolved. Here is a description of the problem and solution.
Problem: The tax rate changes on Checkout page AFTER I switch the country in the address field. How can I make the tax rate change when the language is changed?
Solution: The taxes are calculated in WooCommerce by the country that you select, and this is why the tax is not automatically changed when selecting a language. Customers are able to purchase products in which ever language they choose, regardless of which country they are purchasing from. Unfortunately, there is not a setting in WPML that will automatically change the tax rate based on the language.
This is the technical support forum for WPML - the multilingual WordPress plugin.
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