Missouri Filing Due Date: MO personal income tax returns are due by April 15, in most years — or by the 15^th day of the 4^th month following the end of the taxable year (for fiscal year filers).

Extended Deadline with Missouri Tax Extension: Missouri offers a 6-month tax extension, which moves the filing deadline from April 15 to October 15.

Missouri Tax Extension Form: Missouri’s tax extension is automatic, so there is no formal application or written request to submit. You will automatically receive a Missouri extension if you have no state tax liability or if you’re owed a state refund. On the other hand, if you do owe Missouri tax, you can request a Missouri tax extension with Form MO-60. Make sure to file Form MO-60 by the original due date of your return.

If you have an approved Federal tax extension (IRS Form 4868), the State of Missouri will automatically grant you an extension as well. In this case, you do not need to file anything with Missouri unless you owe state income tax.

Missouri Extension Payment Requirement: A tax extension gives you extra time to file. It does not give you more time to pay your Missouri income tax. All state tax payments are due by the original deadline of the return. Any tax that isn’t paid on time will be subject to interest and penalties. You can make an extension payment for your Missouri income tax with Form MO-60, or pay electronically using Missouri’s Online Services: dor.mo.gov/personal/payonline