True, but if you talk to the brick&mortar stores or listen to the politicians (who want the tax revenue), you'd think that online sales are at 90% of all retail sales and climbing.
Amazon recently "reached an agreement" with my state. Starting next month Amazon will collect 8% sales tax on purchases made from my state. The problem is, my state sales tax is only 4%. Who gets the rest? My guess is Amazon, maybe with some kickback to the politicians who agreed to the deal. I have no proof; I just know how politicians are.
It looks like my days of ordering tons of stuff from Amazon are over. I may order a few items, IF the price +tax is better than other online retailers who still don't charge sales tax.
My thought has always been that sales tax should be collected at the point of purchase. If it were, online companies would be moving to states with lower sales taxes. That might be just the incentive that high tax states need to lower their damned taxes.