Missouri State Tax Guide
Click your state on the map to see filing deadlines, extension rules, refund tracking, and payment options for that state. States shown in gray are coming soon.
Hover or tab a state to see its name.
Missouri State Tax Guide
Missouri Key deadlines (tax year 2025, return filed in 2026)
- Filing deadline: Apr 15, 2026
- Extension request deadline: Apr 15, 2026
- Extended return deadline: Oct 15, 2026 (6-month extension)
- Payment deadline: Apr 15, 2026
- Differs from federal: No
If you have a balance due, you must file a request and submit your payment by April 15. If you do not pay at least 90% of your tax liability by April 15, you face a 5% late-payment penalty and monthly interest.
If the due date for filing your return falls on a Saturday, Sunday, or legal holiday, your return is due by the next regular working day.
October 15, 2026 (6-month extension)
Payment rules
If you have a balance due, you must file a request and submit your payment by April 15. If you do not pay at least 90% of your tax liability by April 15, you face a 5% late-payment penalty and monthly interest.
Payment options
Filing forms
Extension
- MO-60 · Download form
Missouri Refund Tracking
Do I need to file?
You receive an automatic extension of time to file if you have received a valid federal extension. If you expect to owe Missouri state taxes, you should pay the estimated amount due by the original tax filing deadline to help avoid penalties and interest.
Filing methods
Online filing
Online (Fastest): You can bypass paper forms entirely by making an electronic payment through the Payment Portal. Select "Extension Payment" as your payment reason. Making this payment digitally logs your extension.
Mail filing
By Mail: If you want to mail a check, you must print and fill out Missouri tax forms. Mail the form along with your payment voucher and check to the address listed on the document.
