St. Louis Region
Franklin County assessment dates shape the tax year
January 1 is the date Franklin County property owners need to keep in mind. The assessment calendar points real and personal property back to that valuation date, long before a tax bill arrives. A car, trailer, parcel, or other taxable item can become a paperwork problem months later if the assessor record is wrong at the start.
Union has two different tax doors. The Assessor values real estate and personal property and handles the assessment side. The Collector creates and collects the tax bills after values and levies have done their work.
Use that split to save time. A missed personal property list, a real-estate value question, or an appeal starts with the Assessor. Payment, a bill, or a receipt belongs with the Collector. The calendar changes the habit from “deal with taxes in December” to “check the assessment record early enough to fix it.”
References
More from Franklin County: browse every local note for the county.
Last checked against the sources above: July 16, 2026.