Cross-border differences in sales-tax policy create headaches SOME OBSERVERS say the differences in sales-tax policies among the states create a burden on retailers that have to navigate the varied tax requirements when they do business in other states. / PBN FILE PHOTO/MICHAEL SALERNO The rise of interstate e-commerce is magnifying long-standing differences in sales-tax laws among various states, forcing retailers with far-flung customers to adhere to 50 sets of nuanced requirements and leaving consumers unaware that they might be paying a higher tax. Take, for example, a $1,000 TV on sale at Best Buy in Rhode Island. If… Register to keep reading or subscribe today and receive unlimited access.