Due to changes in state law, you will be seeing more and more online sellers charging sales tax as it is legally required because of Nexus. This basically means if you sell on Amazon or use 3rd party fulfillment, (since they warehouse in each state) the states are viewing that as having a business/warehouse in their state requiring companies to collect/remit sales tax. Unfortunately the online sale tax loophole is being closed – we are doing our best to stay compliant.
