Missouri has a state income tax

Missouri taxes your income at the state level. Unlike seven states that have no income tax at all, Missouri collects income tax from residents and uses a progressive tax system — meaning the rate you pay depends on how much you earn. The state tax rate ranges from 1.5% to 5.3% depending on your income bracket.

If you work in Missouri or live there, you will owe state income tax on wages, self-employment income, interest, dividends, and other earnings. The amount withheld from your paycheck depends on what you claim on your W-4 form and your actual income level. You file Missouri state taxes separately from your federal return, usually at the same time.

Key Takeaways

  • Missouri's state income tax rate ranges from 1.5% to 5.3% based on your income bracket, with higher earners paying a higher percentage.
  • You owe Missouri state tax if you are a resident or if you earned income while working in the state, even if you live elsewhere.
  • Your employer withholds state tax from your paycheck based on your W-4 form, but the actual amount owed is calculated when you file your return.
  • Missouri offers a standard deduction and personal exemptions that reduce the income amount subject to tax.
  • You file your Missouri state return using Form MO-1040, which you submit to the Missouri Department of Revenue, not the IRS.

How Missouri's tax brackets work

Missouri uses tax brackets that increase with income. The lowest bracket starts at 1.5% and applies to the first portion of your taxable income. As your income rises, each additional dollar is taxed at a higher rate, up to the maximum of 5.3%. You do not pay 5.3% on all your income — only on the portion that falls into that highest bracket.

The exact dollar amounts for each bracket change yearly. For example, a single filer in 2024 might pay 1.5% on the first $1,000 of taxable income, then 2% on income between $1,000 and $2,000, and so on. Married couples filing jointly have different bracket thresholds than single filers. The Missouri Department of Revenue publishes updated brackets each year, and your tax software or employer should use the current year's rates.

Who has to file a Missouri state return

You must file a Missouri state return if you are a resident and your income exceeds the filing threshold for your filing status. The threshold varies by age and filing status — a single person under 65 typically needs to file if their income is above a certain amount, while someone 65 or older has a higher threshold. Non-residents who earned income in Missouri may also need to file, even if they live in another state.

Residents include anyone who lived in Missouri for more than half the year or maintained a permanent home there. If you moved to Missouri mid-year, you may owe tax only on income earned after you became a resident, depending on the circumstances. If you are unsure whether you must file, the Missouri Department of Revenue website lists the current year's filing requirements by status.

Deductions and exemptions that reduce what you owe

Missouri allows you to claim a standard deduction, which reduces your taxable income before the tax rate is applied. The standard deduction amount depends on your filing status and age. For 2024, a single filer under 65 has one standard deduction amount, while a single filer 65 or older has a higher one. Married couples filing jointly have a different standard deduction than single filers.

You can also claim a personal exemption for yourself and each dependent. Missouri's personal exemption reduces your taxable income further. If you have dependents — children, parents, or others you support — you claim an exemption for each one. Some taxpayers choose to itemize deductions instead of taking the standard deduction if their itemized deductions are larger, though most Missouri residents use the standard deduction.

How withholding works and what happens at tax time

Your employer withholds Missouri state tax from your paycheck based on the W-4 form you complete. The W-4 tells your employer how many allowances to claim, which determines how much tax is held. If you claim too many allowances, too little tax is withheld and you may owe money when you file. If you claim too few, too much is withheld and you receive a refund.

When you file your Missouri return, you report your actual income and calculate your true tax liability. The state compares what was withheld to what you actually owe. If more was withheld than you owe, you get a refund. If less was withheld, you pay the difference. You can adjust your W-4 at any time during the year if you realize your withholding is off.

Filing your Missouri state return

You file your Missouri state return using Form MO-1040, which is the main individual income tax form. You submit it to the Missouri Department of Revenue, not to the IRS. The filing deadline is typically April 15, the same as the federal deadline. If you file your federal return electronically, you can also file your Missouri return electronically through approved tax software or the state's e-file system.

You will need your Social Security number, income documents (W-2s, 1099s), and records of any deductions or credits you claim. If you are self-employed, you also file Schedule C to report business income and expenses. The Missouri Department of Revenue accepts returns by mail or electronic filing. If you cannot file by April 15, you can request an extension, though any tax owed is still due by the original deadline.

Credits that lower your tax bill

Missouri offers several tax credits that directly reduce the amount of tax you owe. A tax credit is different from a deduction — a credit subtracts directly from your tax bill, while a deduction reduces your taxable income. Common Missouri credits include the Earned Income Tax Credit (EITC) for lower-income workers, the child and dependent care credit, and education credits if you paid tuition or student loan interest.

Some credits are refundable, meaning if the credit is larger than your tax bill, you receive the difference as a refund. Others are non-refundable, so they can only reduce your tax to zero. You claim credits on your Missouri return by filling out the appropriate schedule or form. The Missouri Department of Revenue website lists all available credits and the forms needed to claim each one.

Frequently Asked Questions

Do I owe Missouri state tax if I work in Missouri but live in another state?

Yes, you owe Missouri tax on income you earned while working in the state. You file a non-resident return in Missouri and report only the income earned there. You may also owe tax to your home state on the same income, but most states allow a credit for taxes paid to another state to avoid double taxation.

What if I moved to Missouri partway through the year?

You typically owe Missouri tax only on income earned after you became a resident. You file a part-year resident return and report only the income from the months you lived in Missouri. Your employer's withholding may not reflect this, so you may receive a refund or owe money when you file.

Can I file my Missouri return without filing a federal return?

You can file a Missouri return even if you are not required to file federally, though most people file both. If you had Missouri state tax withheld or are owed a refund, filing a state return gets you that money back. Check the Missouri Department of Revenue website for the current filing requirements.

Where do I send my Missouri tax return?

Mail paper returns to the Missouri Department of Revenue at the address listed on the Form MO-1040 instructions. Electronic filing through approved tax software or the state's e-file system is faster and more secure. The state processes e-filed returns more quickly than paper returns.

What if I owe more tax than I can pay by April 15?

You can request a payment plan from the Missouri Department of Revenue. Contact the department to discuss your options — you may be able to pay in installments. Interest and penalties apply to unpaid tax, so paying as soon as possible reduces what you ultimately owe.