Missouri Tax Residency (183-day rule)

Key parameters
Threshold	183 days
Period / Window	Tax year (1 Jan – 31 Dec)
Counting	Any part of a day
Alternative	Domicile
Additional requirements	Permanent place of abode

This applies to anyone with a home available to them in Missouri, whichever state they treat as their own. You are a Missouri resident if either of these applies:

• Domicile — Missouri is your permanent home. This holds unless three things are true together: you keep no permanent place of abode in the state, you maintain one elsewhere, and you spend no more than 30 days in Missouri.
• Abode plus days — you are not domiciled in Missouri but maintain a permanent place of abode in the state and spend more than 183 days of the tax year there.

The domicile route carries its own exit, which is unusual and useful. Someone domiciled in Missouri who genuinely relocates can be treated as a nonresident in the same year, provided all three conditions hold rather than just the day count.

The statutory route runs the other way and reaches people who never regarded themselves as Missourians: a home in the state plus more than half the year present is enough, whatever their intentions.

• The 30-day exit needs all three conditions. Staying under 30 days does nothing on its own if you still keep a permanent place of abode in Missouri.
• A home elsewhere is required, not merely an absence. The exit asks you to maintain a permanent place of abode outside the state, so drifting without settling anywhere does not qualify.
• Both limbs are needed for the statutory route. A high day count with no Missouri dwelling does not attach, and a dwelling with a low count does not either.
• Kansas City and St Louis levy their own earnings taxes. Those are decided separately from state residency.
• Two states can tax the same year as a resident year. The statutory route leaves your domicile elsewhere intact, with credits closing only part of the overlap.

A resident is taxed on income from all sources while a nonresident pays only on Missouri-source income, so an error usually surfaces as out-of-state earnings never reported after a move that met the day count but not the other conditions. The Department charges interest from the original due date and adds penalties for filing late and for underpaying, with greater exposure where an understatement is treated as deliberate. Professional tax advice is strongly recommended in situations like this.

An apartment and a working year

You are domiciled in Kansas, rent an apartment in Kansas City, Missouri, and are in the state most days. Both limbs hold, so you are a Missouri resident as well.

Someone domiciled there who leaves properly

You are Missouri-domiciled, sell your house, buy a home in Florida and return for about 20 days. With no abode in Missouri, a permanent home elsewhere and under 30 days, you are treated as a nonresident.

A move that kept the house

You take the same Florida home but keep the Missouri house available and spend 25 days there. Because a permanent place of abode remains in the state, the exit is unavailable and domicile carries residency.

• Missouri Revised Statutes — Section 143.101, definitions
• Missouri Department of Revenue — Individual income tax