NEW YORK (AP) — A Citigroup unit has reached an agreement with the state of New York to return almost $16 million to more than 31,000 customers across the country who were charged higher advisory fees than they negotiated.

Attorney General Eric T. Schneiderman said in a statement on Thursday that customers with so-called TRAK accounts usually pay an advisory services fee ranging from 1 percent to 5 percent. Since the fees are negotiable, many customers were able to get a lower fee than the standard rate.