2027 Missouri Tax Deadlines
Missouri Individual income tax filing deadlines and extensions for 2027
Missouri tax deadlines are easier to manage when the filing calendar, payment rules, and extension rules sit in one place. Tax year 2027 returns are generally filed in 2028, while estimated payments run through 2027. Missouri uses graduated Individual rates with a current top rate of about 4.7%, retains an income-phased federal income tax deduction under RSMo 143.171, and has Kansas City and St. Louis earnings-tax considerations that should not be dropped from the calendar.
These dates apply to calendar-year filers. Fiscal-year filers follow due dates tied to their fiscal year and should confirm the applicable state deadline before filing or paying.
Last updated: August 5, 2026
Key Missouri tax dates at a glance
This block is the single date reference for 2027 Missouri filing, payment, estimated-payment, and extension planning.
- April 15, 2027: First Missouri estimated Individual income tax payment due.
- June 15, 2027: Second Missouri estimated Individual income tax payment due.
- September 15, 2027: Third Missouri estimated Individual income tax payment due.
- January 18, 2028: Fourth Missouri estimated Individual income tax payment due.
- April 18, 2028: Missouri C Corporation, S Corporation, Partnership, Individual returns, and balances due for calendar-year filers.
- October 16, 2028: Extended Missouri C Corporation, S Corporation, Partnership, and Individual returns due; payment is not extended.
When are Missouri taxes due in 2027?
Missouri's 2027 calendar-year Individual, C Corporation, S Corporation, and Partnership returns are generally due April 18, 2028. Estimated payments run during the tax year, and extensions move filing only to October 2028.
When are Missouri C Corporation taxes due for 2027?
Missouri C Corporations file Form MO-1120 and pay by April 18, 2028. Missouri follows the federal six-month extension timeline, making the extended filing deadline October 16, 2028, but payment remains due April 18, 2028.
- Complete Form MO-1120, Missouri Corporation Income Tax Return.
- Use MyTax Missouri (mytax.mo.gov) when eligible.
- Pay the expected balance by April 18, 2028.
- Use Form MO-7004 when a Missouri-only extension or payment is needed.
- File and pay through MyTax Missouri.
When are Missouri S Corporation and Partnership taxes due for 2027?
Missouri S Corporations file Form MO-1120S and Partnerships file Form MO-1065 by April 18, 2028. A valid federal extension is honored, and Form MO-7004 is used when a Missouri-only extension or payment is needed. The extended filing deadline is October 16, 2028.
- Form MO-1120S: Missouri S Corporation Return.
- Form MO-1065: Missouri Partnership Return.
- Payment remains due April 18, 2028.
When are Missouri Individual taxes due for 2027?
A Missouri Individual return is due April 18, 2028. Form MO-1040 filers receive an automatic six-month filing extension to October 16, 2028, but payment remains due April 18, 2028.
- Form MO-1040: Missouri Individual Income Tax Return.
Use the 2027 Missouri Department of Revenue tax table when released. Current guidance shows graduated rates with a top rate around 4.7%.
When are Missouri estimated payments due?
Calendar-year Missouri estimated payments are due on this schedule:
- April 15, 2027.
- June 15, 2027.
- September 15, 2027.
- January 18, 2028.
Who must make Missouri estimated payments?
Taxpayers who expect a Missouri income-tax balance after withholding and credits may need estimated payments. Apply the tax-year 2027 threshold, safe-harbor, and voucher instructions when the filing-year guidance is released.
What Missouri rules should tax professionals watch for 2027?
- Missouri allows a capped federal income tax deduction for Individuals under current law, with the deductible percentage phased down as Missouri gross income rises.
- The federal income tax deduction is capped at $5,000 for an Individual and $10,000 for combined filers; reconfirm the 2027 instructions before filing.
- Kansas City and St. Louis each impose a 1% earnings tax on qualifying resident and nonresident compensation and business net profits.
- Agriculture, rural development, Missouri Works, Build Missouri Act, New Markets Tax Credit, Historic Preservation Tax Credit, Small Business Deduction, manufacturing, logistics, healthcare, life sciences, renewable energy, and retirement-income items should be reviewed against current Missouri guidance.
- Military retirement pay and Social Security benefits may be exempt from Missouri state income tax under current rules, with pension and senior property tax items requiring separate review.
Tax-professional context: Several considerations make Missouri's tax landscape distinctive for 2027. Missouri uses graduated Individual income tax rates with a current top rate of about 4.7%, pairs them with a capped, income-phased federal income tax deduction, and layers Kansas City and St. Louis 1% earnings taxes on top of the state return. The state also offers a range of business incentives and industry-specific credits, and electronic filing continues to expand. Reconfirm 2027 rate tables, deduction caps, and thresholds against Missouri DOR guidance before filing.
Electronic filing requirements:
- C Corporations and pass-through entities should file electronically through MyTax Missouri (mytax.mo.gov) when eligible.
- Individuals can use Missouri online filing and payment systems where supported.
- Business deductions and payment confirmations should stay with the electronic return record.
- Professional preparers should use approved software vendors and retain submission evidence.
Business Tax Credits:
- Missouri Works Program
- Build Missouri Act
- New Markets Tax Credit Program
- Historic Preservation Tax Credit
- Small Business Deduction
Federal income tax deduction phase-down:
- Missouri allows a capped federal income tax deduction for Individuals, phased down as Missouri gross income rises.
- 35% at $25,000 or less; 25% for $25,001–$50,000; 15% for $50,001–$100,000; 5% for $100,001–$125,000; 0% at $125,001 or more.
- Capped at $5,000 (Individual) / $10,000 (combined); reconfirm with 2027 instructions.
Local earnings taxes and industry items:
- Kansas City and St. Louis each impose a 1% earnings tax on qualifying compensation and business net profits.
- Verify local withholding, filing, and payment requirements in addition to state income tax.
- Agriculture/rural, manufacturing/industrial, transportation/logistics, healthcare/life-sciences, and energy-production incentives should be tracked.
Retirement income considerations:
- Military retirement pay and Social Security benefits may be exempt under current rules.
- Pension income and senior property-tax items require separate review.
Missouri's federal-tax-deduction phase-down and Kansas City and St. Louis earnings taxes add complexity, so that firms can find specialists in the accounting firm directory.
What sources support these Missouri deadlines?
Missouri tax dates with local filing controls
Instead's AI-driven tax platform keeps Missouri filing dates, payment evidence, and entity-specific review steps in one calendar, with filing workflows tied to the actual return work instead of a generic deadline tracker.
Use integrations and estimated payments to connect Missouri due dates, client work, and source systems without turning the state page into a manual checklist. Built for tax professionals who want a cleaner way to manage Missouri deadlines, filings, and review.
The material discussed on this page is meant for general illustration and/or informational purposes only and is not to be construed as investment, tax, or legal advice. You must exercise your own independent professional judgment, recognizing that advice should not be based on unreasonable factual or legal assumptions or unreasonably rely upon representations of the client or others. Further, any advice you provide in connection with tax return preparation must comply in full with the requirements of IRS Circular 230.
Please note that if any due date falls on a federal or state holiday or weekend, it may be adjusted to the next business day. Always verify current deadlines with the appropriate tax professional and authorities.
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