By Missouri law, taxpayers owe taxes based on the property they owned on January 1 of each year. That means, that even if you moved out of county or even out of state , you still owe taxes if you were a resident on January 1. Please understand that you have an obligation to let us know if (and when) your place of residence has changed, so that your assessment forms and tax bills can be sent to you. You are, by state law, responsible for payment of your taxes, including applicable penalties and interest, even if you do not receive a tax bill. Penalties and interest may, by Missouri law, only be waived for personnel on active military duty.