I don't see why this would be an issue. Merchants deal with all of this today while accepting cash, which is an anonymous payment. None of this relies on tracking the individual customer.
The merchants accepting Taler payments would still be responsible for computing and including the applicable sales taxes in the final price charged to the customer. The customer then pays that, anonymously.
The merchants accepting Taler payments would still be responsible for computing and including the applicable sales taxes in the final price charged to the customer. The customer then pays that, anonymously.
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