State regulators and American International Group could reach a settlement by June over an investigation into workers’ compensation premiums.

The multi-state examination, conducted with the help of a National Association of Insurance Commissioners’ working group, is looking into claims that AIG under-reported premiums, according to A.M. Best. The investigation dates back to 2006 and at issue are workers’ compensation premiums reported by the insurer’s Domestic Brokerage Group from 1985 to 1996 and whether risks were written at unapproved rates.

Included in the investigation are Rhode Island, Delaware, Iowa, Massachusetts, Minnesota, New Jersey and Pennsylvania, according to the report, but a settlement would affect all 50 states, the District of Columbia and Guam.

The investigation was generated from a 2006 agreement between AIG and New York regulators to resolve litigation regarding accounting, financial reporting and insurance brokerage practices, as well as claims related to workers’ compensation premium taxes, A.M. Best said.

AIG paid $1.64 billion as part of that agreement, according to the report, but given the company’s current status, it is unclear how much the newest settlement will amount to.