Colorado Amazon Regulations Ruled Unconstitutional April 4, 2012 Mark Robyn Mark Robyn A federal judge in Colorado has ruled that the state’s new regulations for online retailers are unconstitutional because they “impose an undue burden on interstate commerce.” The ruling came after Judge Blackburn temporarily blocked the implementation of the new set of rules in late January. Unlike typical “Amazon taxes,” the law did not actually require out-of-state online retailers to collect the sales tax. Instead, the law required online retailers that opt not collect the sales tax to comply with a host of reporting and record keeping requirements. As we noted in January, “It’s a regulatory scheme so complicated and burdensome that its purpose is to force Amazon to just collect the tax itself.” The judge argued that “Enforcing a reporting requirement on out-of-state retailers will, by definition, discriminate against the out-of-state retailers by imposing unique burdens on those retailers.” Stay informed on the tax policies impacting you. Subscribe to get insights from our trusted experts delivered straight to your inbox. Subscribe Share Tweet Share Email Topics Center for State Tax Policy Colorado Individual Tax Compliance and Complexity Sales Taxes