Platte County Senior Tax Freeze: Eligibility, Baseline, and Filing

The Platte County senior tax freeze locks your property tax bill at its current level so rising assessed values don’t push it higher in future years. You qualify if you’re 62 or older, own your home, and live in it as your primary residence. There is no income limit. You apply at the Platte County Clerk’s Office between October 1 and December 31, and you have to reapply every year during that same window to keep the freeze in place.

Who Qualifies

Missouri Revised Statutes Section 137.1050 sets the eligibility rules, and Platte County adopted the program without adding an income or asset cap.¹ Three things have to be true:

You are 62 or older during the tax year you’re applying for.
You are an owner of record or hold a legal or equitable interest in the property. Ownership through a trust counts, as long as the interest runs through the trust to you.
The home is your primary residence. Rentals, vacation homes, and commercial buildings don’t qualify, and you can only claim one primary residence.

If you meet all three, you qualify regardless of what you earn.²

What the Freeze Actually Covers

The credit offsets increases from rising assessed values and operational tax levies, which make up most of a Platte County tax bill. A few levies sit outside the program. The Missouri State Blind Pension Fund levy and certain debt-service levies are exempt, so your bill can still move up a little even with the freeze in place.³ The increases from these exempt levies are usually small.

How Your Baseline Is Set

The freeze works off a baseline called the initial credit year. That’s your total real property tax liability in the first year you qualified and applied. From then on, the county issues a credit each year equal to the difference between your current bill and that baseline.

Say your tax bill was $2,400 in your initial credit year. Two years later, reassessment pushes the number to $2,800. The county applies a $400 credit and you still pay $2,400. If values ever drop and your tax liability falls below the original baseline, that lower year becomes your new baseline going forward, so you aren’t locked into a higher floor when the market moves down.²

Improvements That Break Through the Freeze

Any improvement that requires a building permit, like an addition, a finished basement, or a deck, triggers a reassessment of the added value. The Assessor’s Office tracks permitted work and stacks the assessed value of the improvement on top of your frozen amount. Your original base stays the same, but the new value is added to your bill.³

Routine maintenance that doesn’t need a permit, such as replacing a water heater or repainting, won’t change your frozen base. The dividing line is the permit.

How to Apply

Get the Platte County Senior Citizens’ Real Property Tax Credit application form. It’s available as a printable PDF on the county website at co.platte.mo.us, as a paper copy at the Platte County Clerk’s Office at 415 Third Street in Platte City, or by mail if you call the Clerk’s Office and request one.¹

The form asks for your name, date of birth, property address, mailing address, phone, email, and your parcel identification number. The parcel ID is on your property tax bill, or you can get it from the Assessor’s Office.

For proof of age and residency, a Missouri driver’s license showing the property address is the simplest option. If your license shows a different address, a voter registration card, utility bill, or mortgage statement works for residency. The county will consider other reasonable documentation too.³

Submit the completed application to the Platte County Clerk’s Office, either in person or by mail to 415 Third Street in Platte City.

Deadline and Yearly Renewal

The application window is October 1 through December 31. Applications submitted outside that window won’t be processed for that tax year.¹

This is not a one-time enrollment. You have to reapply every year during the same October-through-December window. Skip a year and your tax bill reverts to the full current assessed amount for that year. There is no published grace period or hardship exception for late filers.³ Missing by a day means paying the unfrozen amount and waiting until next October.

Selling, Moving, or Losing a Spouse

The freeze attaches to the property, not to you. Sell your Platte County home and buy another, and your old baseline doesn’t travel with you. You file a new application at the new address, and the initial credit year resets to whenever you qualify there. Any gap between your old baseline and the market value of the new home isn’t offset.

If the qualifying homeowner dies and the surviving spouse is already 62 or older, that spouse can apply in their own right and establish a new initial credit year. If the surviving spouse is younger than 62, the credit ends until they turn 62, and the baseline resets to the tax liability in that future year rather than the original one.² For couples with a significant age gap, that waiting period can cost real money.

Challenge Your Assessment Before Your Baseline Locks

Because the freeze locks your tax liability based on the assessed value in your initial credit year, an inflated assessment that year becomes the floor for every future bill. It’s worth challenging before the freeze takes hold.

Platte County offers two levels. You can request an informal hearing with the Assessor’s Office through the end of June. If that doesn’t resolve things, file a formal appeal with the Platte County Board of Equalization. Formal appeal forms must be postmarked or delivered to the Clerk’s Office at 415 Third Street, Room 116, by the second Monday in July. Hearings are held during July.⁴ If the Board’s decision still looks wrong, you can escalate to the Missouri State Tax Commission within 30 days of the Board’s final action or by September 30, whichever is later.

1
Platte County Missouri. Platte County Senior Citizens’ Real Property Tax Credit
2
Missouri Revisor of Statutes. Missouri Revised Statutes 137.1050 – Homestead Property Tax Credit, Persons 62 or Older
3
Platte County, Missouri. Platte County Senior Citizens’ Property Tax Freeze Program
4
Platte County, Missouri. Platte County Board of Equalization Appeals Process