The state in which an insurance company is incorporated or organized. The domiciliary state has primary regulatory authority over the insurer, including conducting financial examinations, approving corporate changes, and overseeing solvency. The domiciliary state insurance department serves as the lead regulator even when the company is licensed to do business in multiple states. If an insurer becomes insolvent, the domiciliary state's insurance commissioner typically serves as the receiver or liquidator. Insurers must comply with the insurance laws and regulations of their domiciliary state as well as any other states where they are licensed to write business (called 'foreign' states from the insurer's perspective).