Missouri doesn’t provide a definition for expatriates. However, an individual domiciled in Missouri who doesn’t maintain a permanent place of abode in Missouri and maintains a permanent place of abode elsewhere, and spends 30 days or less of the taxable year in Missouri, isn’t a resident.
Mo. Rev. Stat. § 143.101; Mo. Dept. of Rev., Form MO-A Instructions.
Foreign Earned Income Exclusion = Yes
Foreign Tax Credits = No
Treaty = Yes
Due Date = April 15
Accepts Federal Extensions = Yes, when tax is not due to be paid and attached to an ITR. If a balance is due, use MO form MO-60