Payment processing for credit cards, e-checks, wire transfer and bill pay may extend into early October for payments which are due by September 30 and early January for payments due by December 31. 
Montgomery County does not honor postmark dates; payments are posted as received.  Please ensure that payments are received by their due dates.  Payments via the County billing website is preferred (see link below).  If your payment has not been applied to the property tax bill after 10 days, online users may submit a request by clicking on the  Create Service Request  button below. Please complete all the fields in the  Contact Information  section then scroll down to the bottom of the page and provide a brief description of the request in the  Brief Description  field.