When you have entered a valid VAT-number you are added to the NoTaxGroup.
When you later remove this VAT-number from your address, for whatever reason, you will stay in the NoTaxGroup.
This way you are able to change country, address, ... without being removed from theNoTaxGroup (as long you don't add a new VAT-number our change your address to the VAT-origin country.
When you have entered a valid VAT-number you are added to the NoTaxGroup. When you later remove this VAT-number from your address, for whatever reason, you will stay in the NoTaxGroup. This way you are able to change country, address, ... without being removed from theNoTaxGroup (as long you don't add a new VAT-number our change your address to the VAT-origin country.