Tax bills are normally mailed out by mid-November every year. If you do not receive a tax bill from Clay County by November 30th, please call (816) 407-3200. Missouri statutes mandate payment by December 31st whether a taxpayer receives a bill or not. Bills do occasionally get lost in the mail, but you still have an obligation to pay. Bills are currently available online 24 hours a day at https://collector.claycountymo.gov.