In order to be timely, payment of taxes must be postmarked on or before January 31st. You may fill out the change of address form or simply make the request in writing.Bexar County property taxes are due today. Pay up to avoid penalties and interest. Customers with a Budget Payment Plan can request that a past due amount be broken into installments and added to the monthly Budget Payment Plan payment. This form is used to notify an employer to withhold wages from a noncustodial parent when they have past-due child support. View the form in English.