Arizona bills Amazon $53 million for uncollected sales taxes

"In a Wednesday filing with the Securities and Exchange Commission, Amazon disclosed that Arizona issued the assessment covering untaxed transactions from March 1, 2006, through Dec. 31, 2010. The bill includes tax and interest on behalf of the state and certain, unspecified cities. Arizona's sales tax, technically called a "transaction-privilege" tax, carries a rate of 6.6 percent."