State and county authorities cited 11 jewelry stores in Nassau Thursday for not charging sales tax to customers who agreed to pay in cash.
The crackdown prompted County Executive Tom Suozzi to estimate that Nassau loses tens of millions of dollars in uncollected sales tax revenue each year.
"The more money the county collects in sales tax, the less we have to collect in property tax," Suozzi said. "For people who are following the rules - people paying their property taxes - this is completely unfair.
"And it's an unfair competitive advantage for the people breaking the rules over the businesses who follow the rules," the county executive added.
Police raided the jewelry stores Tuesday, seizing more than $70,000 in cash, computers and file cabinets containing sales records of nontaxed transactions.