Sullivan County, MO property tax deadlines
4 coming property tax dates for Sullivan County, Missouri. Each one links to its official source and shows the day LevyDay last checked it.
| Next dates | Bills due | Last day without penalty | Appeal by | Exemption filing |
|---|---|---|---|---|
| Sullivan | Not on file | Dec 31, 2026revisor.mo.govOct 21 | Sep 30, 2027stc.mo.govOct 21 | Not on file |
Deadlines in date order
| Date and source | Deadline |
|---|---|
| September 30 every yearstc.mo.govOct 21 | Appeal deadline Appeal to the State Tax Commission By September 30 of the assessment year or within 30 days of the board of equalization's decision, whichever is later. |
| December 31 every yearrevisor.mo.govOct 21 | Last day without penalty Last day to pay before penalties Taxes unpaid on January 1 are delinquent, and penalties are added after that. A mailed payment counts as paid on its postmark date. |
| Varies, see rule set by noticerevisor.mo.govOct 21 | Other Mailed payments count on the postmark date For registered or certified mail, the date it was registered or certified counts. |
| Varies, see rule see rulerevisor.mo.govOct 21 | Appeal deadline Appeal to the county board of equalization Before the second Monday in July, unless the board gives more time. Some counties take appeals until 5 p.m. on that Monday (Clay County: Monday, July 13, 2026). Charter counties and St. Louis City set their own dates. |
Appealing your assessed value
Appeal by Sep 30, 2027 in 342 daysstc.mo.govOct 21
If you think the county valued your home too high, you can appeal. Filing with the county is free and you can do it yourself.
Get help filing an appeal
After you send your details, we look for an independent appeal firm or attorney to take your case. We'll be in touch once one has agreed. Firms usually charge a share of what you save, and the one that takes it may pay LevyDay a referral fee.
LevyDay doesn't file appeals or give legal or tax advice. We only pass your details on. The independent firm or attorney that takes your case does the work and sets its own fee.
Get help filing an appealPlaces in Sullivan County
They are: Browning, Greencastle, Green City, Harris, Humphreys, Milan, Newtown, Osgood, Pollock, Winigan. Every place in the county gets the dates above.
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