Missouri Senior Property Tax Freeze Deadlines by County

The Missouri senior property tax freeze deadline is June 30, 2026, in most participating counties for the 2026 tax year, but Clay County closes its window on March 31 and other counties may set their own dates. Because the state law leaves scheduling to each county, there is no single statewide cutoff. Confirm the exact date with your county assessor or collector before you rely on it.

Confirmed June 30 Counties for 2026

St. Charles County, Cole County, Jefferson County, and St. Louis County have all set June 30, 2026, as the filing cutoff for the 2026 tax year.¹² These counties generally open the application window around March 1 and keep it open through the end of June.

Clay County runs on a very different calendar. Applications and annual renewal affidavits are accepted only between January 1 and March 31, giving residents there roughly three months earlier than their neighbors to the east.³ If you live in Clay County, treat the spring quarter as your only window.

If your county is not listed above, call the assessor’s or collector’s office directly. Missing the deadline means waiting a full year to try again, and any assessment or levy increase during that year is money you pay out of pocket.

Check That Your County Actually Offers the Program

A deadline only matters if your county has adopted the freeze. Under RSMo 137.1050, each Missouri county must pass an ordinance or hold a voter referendum before residents can apply.⁴ Several large counties and the City of St. Louis have done so, but adoption is still rolling out across the state. Your county assessor’s office can tell you on the phone whether a program exists.

In counties that have not yet adopted, residents can force a ballot question by petition if at least five percent of voters from the last gubernatorial election sign on.⁴

The Renewal Deadline Is the Same Date

This catches people every year: the freeze is not a one-time filing. You must renew annually, within the same window your county uses for new applications, or your credit disappears and your tax bill reverts to the current amount.¹

Renewal itself is much lighter than the original application. You sign an affidavit confirming that you still live at the property and that the title has not changed hands, including into a trust.¹ You do not usually need to resubmit your original documents. What you do need is to file on time. In most participating counties that means by June 30; in Clay County it means by March 31.³

Counties are not required to remind you. Put the renewal date on a recurring annual calendar.

Have These Documents Ready Before You File

Missing a single document is the most common reason applications stall past the deadline. For a first-time application, gather:

Proof of age: a government-issued ID showing your date of birth, a birth certificate, a valid passport, or a military service record.⁵
Proof of Missouri residency: a Missouri driver’s license, voter registration card, or utility bill showing your homestead address.²
Proof of ownership and tax liability: a copy of your real property tax bill or a paid tax receipt showing you as the responsible party.²
Your parcel identification number, which appears on a previous tax statement or your deed.²

Some counties require the owner’s signature to be notarized on paper forms. St. Charles County requires notarization for mail-in and in-person filings, though its online submission does not.¹ Check your county’s specific form before you walk in, so an unwitnessed signature doesn’t send you home to try again with the clock ticking.

You must also meet the underlying eligibility rules on the day you file: age 62 or older, Missouri resident, owner of record or holder of a legal or equitable interest in the property, and personally liable for the property taxes. The home must be your primary residence, and you can only claim one.⁴ There is no income limit.

How to Submit Before the Cutoff

Most participating counties give you three ways to file: in person at the county collector’s or assessor’s office, by mail, and through an online portal. Jefferson County accepts walk-ins at the County Administration Center, mailed forms to the Collector of Revenue, and submissions by email.⁶ The City of St. Louis offers the same three options.⁵

If you plan to mail your application, use certified mail or a delivery service with tracking. A postmark alone may not satisfy your county’s requirements, and you will want proof of delivery if there is any later dispute about whether you filed on time. Online portals typically send an electronic confirmation the moment you submit, which is the cleanest evidence you can hold.

Several counties run walk-in help sessions during the application period. St. Charles County staffs weekday assistance, and Cole County offers help on Wednesdays and Thursdays from May through June.² These sessions fill up as the deadline approaches, so do not save the visit for the last week.

If Your Application Is Denied Close to the Deadline

Counties review applications for completeness after receiving them. The City of St. Louis estimates a response within 60 days.⁵ If your application is denied, you generally receive a notice explaining what was missing, and you have a short window to fix it.

St. Charles County spells out that window: denials issued before June 16 give you until June 30 to submit a corrected application, and denials issued on or after June 16 give you 10 business days from the date of the notice.¹ Filing early gives you room to correct problems inside the cure period; filing on June 29 does not.

If You Move, You Restart the Clock

The freeze does not travel with you. If you sell your home and buy another Missouri residence, the credit ends on the old property and does not transfer. You must file a brand-new application at your new address, and a new base year is set from the tax liability there.⁷ That new application is subject to the same county deadline as any other first-time filing. If you moved between counties, verify both the deadline and the participation status of the new county before you assume anything carries over.

1
St. Charles County, MO – Official Website. Seniors Real Estate Property Tax Relief Program
2
Cole County, MO. Senior Real Estate Property Tax Freeze
3
Clay County, MO. Senior Real Estate Property Tax Relief
4
Missouri Revisor of Statutes. Missouri Revised Statutes 137.1050 – Homestead Property Tax Credit, Persons 62 or Older
5
City of St. Louis. Apply for or Renew the Senior Property Tax Freeze Credit
6
Jefferson County, MO. Real Property Tax Credit for Seniors
7
Buchanan County Missouri. Senior Real Estate Property Tax Relief Program Frequently Asked Questions and Definitions