Missouri corporate income tax return

File the Missouri corporate income tax return with the Missouri Department of Revenue by the 15th day of the 4th month after the fiscal year ends (April 15 for a calendar year) and pay any tax due. Most states follow the federal extension if one is filed.

When: By the 15th day of the 4th month after the fiscal year ends (April 15 for a calendar year).
Agency: Missouri Department of Revenue
Applies to: C corporations registered in Missouri.
Source: dor.mo.gov, read October 22, 2026

Jay explains

Missouri taxes corporate income, so a C corporation doing business there files a state return with the Missouri Department of Revenue by the 15th day of the 4th month after the fiscal year ends (April 15 for a calendar year), the same day as the federal Form 1120. The state usually honors a federal extension to file, but not to pay. The form name and any minimum tax are on the state's site.

Next dates

For a calendar year company. Shown as the agency states them; if a date falls on a weekend, file before it.

April 15, 2027
April 15, 2028

Also in Missouri

Missouri annual registration report Missouri nonprofit annual registration report Missouri charitable organization annual report Missouri corporate estimated tax payment Missouri pass through entity return Missouri personal income tax return with business income Missouri unemployment insurance wage report Missouri annual withholding reconciliation Missouri sales tax return

See it on your company's calendar

Your company's compliance calendar

Three answers to start. Refine it after.

What kind of organization is it?

An LLC's tax treatment decides which federal return it files. Choose the line that matches yours. Nonprofits are covered too.

State of formation

Employees

Count everyone on payroll. An S corporation's working owners are employees: they are paid a salary.

Where is it based? The state of the office, or of most of the people

A company based outside its state of formation is registered in both and files in both.

More about the company: other states, payroll, dates, abroad

Company name

Date registered in each other state

Optional. Some states key their report to the day you registered there rather than your date of formation; without it, the formation date stands in and the calendar says so.

Who runs payroll?

Fiscal year ends in

Date of formation

Missouri keys its report to this date. Add it and the calendar places it.

Annual revenue

Some taxes start at a revenue threshold.

We pay independent contractors We offer a retirement plan (401(k), SIMPLE, SEP)

Outside the United States We hold a bank or financial account outside the US A person or company outside the US owns 25% or more of it We own 10% or more of a company outside the US We pay people or companies outside the US

Each adds the FinCEN or IRS form that comes with it: the FBAR, Form 5472, Form 5471, Forms 1042 and 1042-S.

No account needed. Nothing is stored until you save it.

Put it in your calendar

The calendar is free to read and to print. A subscription keeps it alive.

Every date in Google Calendar, Outlook or Apple Calendar, updated when a rule changes
Email reminders 30 days, 7 days and 1 day before each date, and on the day
Your bookkeeper, your office manager, your CPA: invite anyone, unlimited
Mark each filing done and keep a filing record you can send a lender or a buyer
Every change in federal or state rules that touches your company, explained
Jay's plain English notes on every obligation

$190 a year ($15.83 a month), or $19 month to month

Put it in my calendar

Advisors: $49 a month for up to ten companies, $4 each after. Details