Mo. Rev. Stat. § 148.420: Director of revenue to collect annual tax when company withdraws from Missouri or fails to pay tax.

If any insurance company, organized under the laws of any other state or government, doing business in this state, shall withdraw from business in this state before the annual tax shall fall due according to the provisions of sections 148.310 to 148.461, or shall fail or neglect to pay the tax imposed under sections 148.310 to 148.461, the director of revenue shall at once proceed to collect the same.