Missouri Tax Filing: Form MO-1040, MO-A and Residency Rules
Updated October 24, 2026
How Missouri builds your tax bill
Missouri uses graduated tax rates. Your return starts with your federal adjusted gross income. Form MO-A then adds and subtracts items to reach Missouri income, and the Department of Revenue's tax chart gives the tax.
- Pensions and Social Security. Part 3 of Form MO-A handles public pensions, private pensions and Social Security or Social Security disability. Attach your federal return pages, Form 1099-R and Form SSA-1099.
- Military. Missouri has a deduction for active duty income, a separate one for National Guard and reserve training pay, and a subtraction for military retirement.
- Deductions. If you itemized on your federal return, you may itemize or take the standard deduction in Missouri, whichever is higher. If federal rules forced you to itemize, Missouri does too.
Forms, e-file and extensions
Form MO-1040 is the long form, and anyone can use it. Paper filers with no special situations can try the shorter Form MO-1040A. For e-file, the Department lists approved software, and many providers offer free filing if you meet their conditions. It also lists approved preparers who file for a fee. The state portal is MyTax Missouri, and a separate page shows your return status.
The return is due April 15. Three ways to get more time:
- Federal extension: you get Missouri time automatically. Check the extension box at the top of Form MO-1040 and attach Form 4868. The Department warns that skipping the box may cost you the extension.
- Form MO-60 with no tax due: automatic time to file, to October 15 for calendar-year filers.
- Form MO-60 with tax due: send it with payment by the original due date.
None of these extend the time to pay, and a penalty addition applies if tax is unpaid by the original date. See our extension guide.
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Who counts as a Missouri resident
You are a resident if Missouri is your domicile. You are also a resident if you keep permanent living quarters in Missouri and spend more than 183 days of the year here. There is an exception. If you are domiciled in Missouri but keep no living quarters here, keep them elsewhere and spend 30 days or less in Missouri, you are not a resident.
Missouri defines domicile as the place you intend as your permanent home and plan to return to when away. It lasts until you move somewhere new with real intent to stay.
Nonresidents with income from another state use Form MO-NRI to find their Missouri income percentage. Residents who paid tax to another state use Form MO-CR for a credit. You cannot use both forms on one return, so figure which gives the lower tax. A nonresident with only a small amount of Missouri income does not have to file, and the instructions give the cutoff.
Working in or out of Missouri
The Department says wages for services done in Missouri are subject to Missouri withholding. A nonresident who does all their work outside Missouri owes Missouri nothing on those wages. If an employee splits time across states, the employer prorates withholding by the share of work done in Missouri.
Missouri residents who work elsewhere can give their employer Form MO W-4C, an affidavit that sets the withholding percentage. Your return still counts all your income, and only wages earned in Missouri are taxed here for nonresidents.
Property taxes are a Missouri-specific trap. A nonresident who deducted property taxes paid to another state on federal Schedule A must add that amount back on Form MO-A, unless the other state allows a deduction for Missouri property tax. Our remote worker guide explains how multi-state pay works.
Military families and Missouri
The instructions say Missouri presumes your home of record is Missouri if you entered the service here. If you are stationed outside Missouri, you count as a nonresident when you keep no permanent living quarters in Missouri, keep them elsewhere and spend no more than 30 days of the year in Missouri. Then your military pay, interest and dividends are not taxable to Missouri, and you file Form MO-NRI with Form MO-1040. If your spouse stays in Missouri more than 30 days, all your income becomes taxable here.
- Stationed in Missouri, home elsewhere: your military pay is not taxable here. If military pay is your only Missouri income, use the Military No Return Required form on MyTax Missouri.
- Spouses: income earned by a spouse who is here only because of military orders is not taxable here. A spouse who earns above the filing cutoff files Form MO-1040 and proves their home state, for example with a driver license, vehicle registration or voter card.
Moving to or from Florida
If you move out, you are a part-year resident. All income earned while you lived in Missouri is taxable to Missouri. You can choose to be taxed as a full-year resident and claim Form MO-CR for tax paid to another state, or to be taxed as a nonresident using Form MO-NRI. Complete both forms and use the one that lowers your tax. Attach the other state's return.
Keeping a place to live in Missouri for most of the year can make you a resident even if your permanent home moved. Count your days carefully. Our moving to Florida tax page covers the Florida side.
Paperwork, estimated tax and common slips
- Withholding statements. Attach W-2s and 1099s. Count only Missouri withholding. Do not include federal tax, local taxes or city earnings taxes.
- Form MO-A on every return, even an amended one. An amended return also needs your federal changes and Form 1040-X.
- Estimated tax. Use Form MO-1040ES if you expect to owe above a set amount. You can pay online.
- Paid preparer rules. Missouri requires a paid preparer to sign the return and list a PTIN.
- Refund offsets. The Department can apply your refund to child support or federal debts, and it sends a notice.
See our tax deadlines page for federal dates.
Filing from Missouri with Zero Fuss Taxes
We prepare returns remotely from our Longwood, Florida office for clients in all 50 states, so you never need to visit. A real preparer reviews and signs your return, and you start with a free quote.
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FAQ
Does Missouri have a graduated or flat income tax?
Missouri uses graduated rates. Your Missouri tax comes from a tax chart in the instructions, based on your Missouri taxable income.
How do I get a Missouri extension?
A federal extension gives you one automatically. Check the extension box on Form MO-1040 and attach Form 4868. You can also file Form MO-60. If you owe tax, send Form MO-60 with payment by the original due date.
When does Missouri call me a resident?
If Missouri is your domicile, or if you keep permanent living quarters here and spend more than 183 days in the year. A short exception applies if your home and living quarters are elsewhere and you spend 30 days or less in Missouri.
Do I use Form MO-CR or Form MO-NRI?
Residents who paid tax to another state use Form MO-CR. Nonresidents with income from other states use Form MO-NRI. Part-year residents can try both and use the one that lowers the tax.
Nearby state guides
Sources
- dor.mo.gov/forms/MO-1040%20Instructions_2025.pdf
- dor.mo.gov/faq/taxation/individual/general.html
- dor.mo.gov/faq/taxation/individual/non-resident.html
- dor.mo.gov/taxation/business/remote.html
- irs.gov/filing/individuals/when-to-file
General information, not tax advice for your specific situation. Rules can change, so check the official sources below. Zero Fuss Taxes is a PTIN-holding tax preparation firm. We are not a CPA firm, enrolled agents or attorneys.