Missouri taxes residents on all income. You can be a resident by domicile, or by keeping a home in the state and spending enough days there.
You are a Missouri resident if you are domiciled in Missouri, or if you maintain a permanent place of abode in the state and spend more than 183 days there. A Missouri domiciliary avoids resident status only with no Missouri home, a home elsewhere, and 30 or fewer days in the state.
Missouri treats a non-domiciliary as a resident when two things are true in the same year: you maintain a permanent place of abode in the state, and you spend more than 183 days there. Meet both and Missouri taxes you as a resident even if your true home is elsewhere. A Missouri domiciliary avoids resident status only with no Missouri home, a home elsewhere, and 30 or fewer days in the state.
Missouri does not spell out how partial days are counted, so count conservatively and keep records. Days add up across every trip during the year, not just one stay.
In an audit the burden is on you to prove the days you were outside the state. A contemporaneous day-by-day log, backed by phone, card, and travel records, is the strongest defense.
DayStayed counts your days in Missouri automatically and warns you before you cross the line.
Maintaining a permanent place of abode in Missouri and spending more than 183 days in the state during the year, even if you are domiciled elsewhere.
Missouri does not spell out how partial days are counted, so count conservatively and keep records.
Residents are taxed on all income for the year.
Track your days by state automatically and keep an export ready before anyone asks for it.
