Missouri Tax Residence: the rule, how days are counted, examples

Summary

Missouri treats you as a resident for income tax if your permanent home in law is in another state, but you maintain a permanent place of abode in Missouri and spend more than 183 days of the tax year in the state. Both conditions are needed, and all days in the year are added together. A resident is taxed on income from all sources. The rule is in section 143.101 of the Revised Statutes of Missouri and is applied by the Missouri Department of Revenue.

Limit: 183 days. Day 184 is the first day over the limit
Period: The tax year, for most people 1 January to 31 December
A day counts when: Not defined in the statute. Countr counts any part of a day
Second condition: You maintain a permanent place of abode in Missouri
Law: Revised Statutes of Missouri, section 143.101
Run by: Missouri Department of Revenue

Who it applies to

People from Kansas or Illinois who keep a home in Kansas City or St. Louis, on the Missouri side of the state line.
University staff, hospital staff and others who live in Missouri for long terms and keep their legal home elsewhere.
Owners of a lake house in Missouri that they use for a large part of the year.
People with two homes who need to show which state may tax all their income.

The rule

Section 143.101 defines 'resident' in two parts. The first part is an individual who is domiciled in Missouri. Domicile, in the words of the Department of Revenue, is the place a person intends to be his or her permanent home, the place the person intends to return to whenever absent. The second part is an individual who is not domiciled in Missouri but maintains a permanent place of abode in the state and spends in the aggregate more than 183 days of the taxable year in the state. The Department describes the second part as having permanent living quarters in Missouri and spending more than 183 days of the taxable year there.

The first part has its own exception. A person domiciled in Missouri is not a resident for a year if he or she maintains no permanent place of abode in Missouri, does maintain a permanent place of abode elsewhere, and spends in the aggregate not more than 30 days of the taxable year in Missouri. All three must be true. So the statute has a 183-day line for people from other states and a 30-day line for people from Missouri.

The statute does not define 'permanent place of abode' and does not say how a part of a day is counted. A nonresident, in the words of the same section, is simply an individual who is not a resident. The Department publishes a flow chart that asks the statute's questions in order: a permanent place of residence in Missouri, more than 30 or more than 183 days, and domicile. It looks at the whole situation of the person.

A person who moves into or out of Missouri during the year is a part-year resident. The Department says such a person is treated as a nonresident but may choose to work out the tax as if a resident for the entire year. Nonresidents can use Form MO-NRI to pay tax on the Missouri share of their income, and residents can use Form MO-CR to take a credit for tax paid to another state.

Why it exists

Kansas City and St. Louis both sit on a state line, and many people have a home on each side. A state may tax all the income of its residents. If domicile were the only test, a person could live in Missouri for most of the year and still be taxed as a visitor. The 183-day test with a permanent home in the state gives Missouri a clear rule for these people, and the 30-day test gives a clear way out for Missourians who have really gone.

Counting the days

You count the days of the tax year that you spent in Missouri and add them together. The statute gives no rule for part days, so the careful way is to count each calendar day with any time in the state.

Take the tax year. For most people this is 1 January to 31 December.
Mark each calendar day on which you were in Missouri, including arrival and departure days.
Add the days from every stay in the year.
Compare with 183. At 183 days or fewer you are not over the limit. At 184 days or more the day condition is met.
Check the second condition: did you maintain a permanent place of abode in Missouri during the year?
Keep proof of where you were, such as travel tickets, toll records and card receipts.

How Countr counts it. Countr counts every calendar day on which your phone records you in Missouri, from 1 January to 31 December, and compares the total with 183. Any part of a day counts as a full day. Countr starts to warn you 14 days before the limit. The app is simpler than the law in two ways. It cannot see whether you maintain a permanent place of abode in Missouri, so add this tracker only if you keep such a home. And it cannot tell a day when you only crossed the state from a day when you stayed, so it counts both. For people who cross the state line every day, this means the warning can come early, never late.

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Examples

Two teaching terms in St. Louis

Grace is a professor whose domicile is Illinois, where her family lives. She owns a small house in St. Louis and stays there during term. In 2026 she is in Missouri from 15 January to 20 May, 126 days, and from 20 August to 18 December, 121 days. Her total is 247 days. She maintains a permanent place of abode in Missouri and has more than 183 days, so Missouri treats her as a resident for 2026.

A lake house used for 95 days

Frank is retired and domiciled in Arkansas. He owns a lake house near Branson that can be lived in all year. In 2026 he uses it on 95 days. He has a home in Missouri, but he is far under 183 days, so he is not a resident under this rule. If he lets the house to holiday guests, the rent is Missouri income and is taxable to him as a nonresident.

183 days in a leap year

The Missouri statute names a fixed number, 183 days, and not half the year. In 2028, which has 366 days, Dev keeps a flat in Kansas City, Missouri and spends exactly 183 days in Missouri and 183 days in Kansas. He has not spent more than 183 days in Missouri, so the day condition is not met. A 184th day would meet it, in a leap year and in a normal year alike.

Exceptions

A person domiciled in Missouri is treated as a nonresident for a year when three things are true: no permanent place of abode in Missouri, a permanent place of abode elsewhere, and not more than 30 days in Missouri in the year.
A person who is not domiciled in Missouri and has no permanent place of abode there is not a resident under this rule, whatever the number of days. Missouri can still tax income from Missouri sources.
Federal law protects members of the armed forces: a service member does not become a resident of a state only because military orders station him or her there. The Department has separate guidance for military personnel.
A part-year resident, who moved into or out of Missouri and changed domicile, is treated as a nonresident but may choose to be taxed as a resident for the whole year.
A resident who also pays income tax to another state on the same income can claim a credit on Form MO-CR.

Common misconceptions

“Working in Missouri for more than 183 days makes me a Missouri resident.”: Not by itself. A person from Kansas who works in Missouri every day and goes home each night has many Missouri days, but without a permanent place of abode in Missouri the rule is not met. Missouri taxes the wages earned in Missouri as nonresident income.
“The limit is half the year.”: The statute says 'more than one hundred eighty-three days'. It is the same number in a leap year. Day 184 is the first day over.
“I am from Missouri and work abroad, so the 183-day rule tells me I am not a resident.”: The 183-day line is only for people domiciled in another state. A person domiciled in Missouri is a resident unless he or she meets the three conditions of the 30-day rule.
“The days must be in one stay.”: The statute says 'in the aggregate'. Every stay in the tax year is added to the total.

Questions and answers

Does the day I arrive in Missouri count as a day?

The statute does not say how part days are counted. It only speaks of days spent in the state. The careful reading is to count any calendar day on which you were in Missouri, and Countr counts it that way.

What happens if I spend 184 days in Missouri?

If you also maintain a permanent place of abode in Missouri, you are a resident for that tax year, and Missouri taxes your income from all sources. You can claim a credit on Form MO-CR for income tax paid to another state on the same income.

I live in Kansas and work in Kansas City, Missouri. Do I need to count days?

Only if you also keep a home in Missouri. With no permanent place of abode in Missouri you are a nonresident, and Missouri taxes only your Missouri income. If you rent or buy a place on the Missouri side, the day count starts to matter.

Does Missouri count the days of my spouse together with mine?

The statute speaks of 'an individual', so each person is tested alone. One spouse can pass 183 days while the other does not. Each of you should keep your own count.

Does the Missouri count start again each year?

Yes. The test covers one taxable year. For most people the count goes back to zero on 1 January.

Is a hotel room a permanent place of abode in Missouri?

The statute does not define the term. In ordinary use it means living quarters that are kept for you on a lasting basis, and a short hotel stay is not that. The Department decides on the facts of each case.

Sources

Other rules for United States

Arizona Tax Residence 273 days in each calendar year
California Tax — Visitors 181 days in each calendar year
California Tax Residence 273 days in each calendar year
Connecticut Tax — 30 Days or Fewer 30 days in each calendar year
Connecticut Tax Residence 183 days in each calendar year
Delaware Tax Residence 183 days in each calendar year
Hawaii Tax Residence 200 days in each calendar year
Idaho Tax Residence 270 days in each calendar year

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This page explains the rule and how the days are counted. It is not legal or tax advice. The authority decides each case on its own facts.