No, in-state sales tax is a burden on in-state retailers. Charging an internal tax will affect internal businesses and charging an external tax will affect exte

No, in-state sales tax is a burden on in-state retailers. Charging an internal tax will affect internal businesses and charging an external tax will affect external businesses. But, charging a tax on inter-state commerce is not allowed by your constitution. If the states are so concerned with the competitiveness of their retailers maybe they should stop taxing them. Personally, I think retailers are just greedy and clinging to an uncompetitive business model while asking for governments to intervene (known as protectionism).