Congress should allow states to require out-of-state sellers to collect sales tax, but it should only grant this authority under a framework that ensures that states create and maintain a fair and simple tax system that does not unduly burden out-of-state sellers. States rightly argue that tax laws need to evolve to allow them to require out-of-state sellers without nexus to collect and remit taxes on Internet sales to state residents. Neither Internet retailers nor brick-and-mortar retailers should receive preferential tax treatment.