Property owners in Platte City pay a single annual property tax bill that combines levies from the school district, the county, the city, and several special districts, all applied to an assessed value set by the Platte County Assessor. The Platte County Collector bills and collects the total, and payment is due by December 31 each year. Understanding how the assessment, the levy, and the deadlines fit together is the difference between a predictable bill and an expensive surprise.
How Your Bill Is Calculated
Your tax bill starts with an assessed value, not the market value of your property. Missouri law requires the assessor to apply a fixed percentage to market value depending on the property type, under Missouri Revised Statutes Section 137.115:
- Residential real estate: 19% of market value
- Agricultural land: 12% of market value
- Commercial real estate: 32% of market value
- Personal property: 33.33% of market value
A home with a market value of $300,000 has an assessed value of $57,000. The same $300,000 in commercial property assesses at $96,000.1Missouri Revisor of Statutes. Missouri Code 137.115 – Real and Personal Property, Assessment
The bill itself is that assessed value multiplied by a combined levy rate, expressed as dollars per $100 of assessed value. The City of Platte City’s own levy for 2025 was $0.9678 per $100, covering general revenue and debt service.2Missouri State Auditor. Tax Rates for County: Platte But the city rate is only one line. Your combined levy also includes:
- Platte County R-3 School District, usually the largest single share
- Platte County general operations
- Mid-Continent Public Library
- Road and bridge districts
- The mental health fund and other special districts
Each entity sets its own rate through public hearings and board votes, and the Collector adds them together on one bill. To work out a specific amount, take the assessed value, divide by 100, and multiply by the combined levy. On a home assessed at $57,000 with a combined levy of $7.50 per $100, the math runs $57,000 ÷ 100 × $7.50 = $4,275 for the year. The combined rate varies by address depending on which districts overlap the parcel, so the Missouri State Auditor’s tax rate lookup by county is the place to confirm the exact figure.
Reassessment
Missouri reassesses real property in odd-numbered years. For 2026, your real estate value is the one set during the 2025 reassessment; even-year values carry forward unless you made a physical change like an addition.3Missouri State Tax Commission. Property Reassessment and Taxation Personal property is reassessed every year.
How and When to Pay
Payment is due to the Platte County Collector by December 31. That deadline applies whether you pay online, by mail, or in person.4Platte County Collector. Platte County Collector
- Online through the Collector’s website, using credit or debit card. The convenience fee is 2.45% of the balance.5Platte County Collector. Platte County Collector
- By mail, with a check or money order. The envelope must carry a USPS postmark no later than December 31. Envelopes postmarked after that date are returned unless penalty and interest are included.
- In person at the Platte County Administration Building, 415 3rd Street, Room 212, Platte City, MO 64079. The office takes cash, personal and cashier’s checks, money orders, and cards, Monday through Friday, 8:00 a.m. to 5:00 p.m.
- Through the 24-hour drop box outside the entrance to the Platte County Government Complex.
You’ll need the parcel identification number for real estate or the account number for personal property. Both appear on the statement the Collector mails you. If you no longer have the statement, look up the account on the Collector’s website by name or parcel number.6Platte County Collector. Platte County Collector – Real Estate Search
Keep the Receipt
Missouri law requires the Collector to issue a receipt showing the amount paid, the property, and the year covered.7Missouri Revisor of Statutes. Missouri Code 139.090 – Receipt for Payment You need that receipt for more than your files. Under RSMo 301.025, the Department of Revenue will not register or renew a motor vehicle without proof that personal property taxes are paid for the preceding year.8Missouri Revisor of Statutes. Missouri Code 301.025 – State Registration License
If You Pay Late
Missouri Revised Statutes Section 139.100 requires the Collector to add a penalty starting January 1 for any bill not paid by December 31.9Missouri Revisor of Statutes. Missouri Code 139.100 – Penalty for Late Payment The only statutory exception is for taxpayers serving in the military and stationed away from home.10Missouri State Tax Commission. What Fees and Penalties May I Owe
Unpaid real estate taxes eventually put the property on the delinquent tax sale list. Under RSMo 140.250, after two successive years of offerings with no qualifying bid, the property goes to the highest bidder at the next regular sale with only a 90-day redemption period; a third offering can produce a collector’s deed with no redemption at all.11Missouri Revisor of Statutes. Missouri Code 140.250 – Delinquent Tax Sale A single missed year also blocks vehicle registration renewal and clouds the title with a tax lien.
The Personal Property Filing Deadline
Personal property, which covers vehicles, boats, trailers, and business equipment, isn’t valued by the assessor on its own. You have to file a declaration listing what you own. The Platte County Assessor mails forms at the start of January, and the completed form is due back by March 1.12Platte County Assessor’s Office. Business Personal Property Missing that deadline triggers a penalty: the property is assessed at 10% above its actual value, and that inflated figure flows straight through to the tax bill you’ll owe in December.
Challenging Your Assessment
If comparable sales or property condition suggest the assessor overvalued your parcel, there’s a structured appeal path with firm deadlines.
Informal Review
Start by contacting the Platte County Assessor’s office to request an informal hearing, available through the end of June. Bring recent comparable sales, photos of any damage, or a private appraisal. Many disputes end here.13Platte County, Missouri. Platte County Board of Equalization Appeals Process
Board of Equalization
If the informal review doesn’t settle it, file a formal appeal with the Platte County Board of Equalization. The completed form must be postmarked or delivered to the County Clerk’s Office before the second Monday in July.14Platte County Assessor’s Office. Real Property Appeal Process Forms are available online or at the Clerk’s Office, 415 3rd Street, Room 116, Platte City, MO 64079. Hearings take place in July.
State Tax Commission
If you’re still dissatisfied after the Board’s decision, appeal to the Missouri State Tax Commission within 30 days of the Board’s final action or by September 30, whichever comes later. A licensed appraisal typically runs $300 to $1,000 and can strengthen the case at any stage.
Relief Programs You Can Apply For
Platte County Senior Tax Credit
Platte County offers a credit that effectively freezes a qualifying homeowner’s property tax bill. You must be at least 62 years old, own and live in your primary Platte County residence, and be responsible for the taxes on it. Ownership through a trust counts.15Platte County, Missouri. Senior Citizens Tax Credit Applications are typically accepted October through December for the following tax year and must be renewed annually. You’ll need the parcel identification number, proof of age, and proof of residency; a driver’s license with the property address covers both, and voter registration cards, utility bills, or mortgage statements work when it doesn’t. Once approved, the bill stays frozen even if the levy or assessed value rises, but permitted improvements are added on top of the frozen amount.
Missouri Property Tax Credit
The state Circuit Breaker credit is open to homeowners and renters who are 65 or older, or 100% disabled, and meet income limits. The maximum is $1,100 for homeowners and $750 for renters, scaled to household income and taxes or rent paid.16Missouri Department of Revenue. Property Tax Credit Claim it by filing Form MO-PTC with the Missouri Department of Revenue. Renters qualify only if the property they live in pays property taxes; tax-exempt housing is out. The state credit is separate from the county senior freeze, so eligible residents can pursue both.