Editorial: Small retailers who sold through Amazon are facing a tax time bomb

Online sales have taken over a growing percentage of the U.S. retail market, accounting for about $1 out of every $7 spent by consumers. But through much of that rise, online sellers had an unfair advantage over brick-and-mortar retailers: They weren't compelled to collect sales taxes from consumers in states where they had no offices. That's because the Supreme Court had exempted mail-order companies decades ago from collecting out-of-state sales taxes.

That all changed