Real Property Tax Bills District of Columbia law provides that all taxable real property in the District is subject to an annual levy of tax. A property owner will receive a property tax bill twice a year. The tax should be paid timely to avoid penalties and interest. Due Dates   Real property tax bill payments are due twice a year as follows: Billing Period Due Date** 1st Half October 1 - March 31 March 31 2nd Half April 1 - September 30 September 15 ** While most real property tax bills are mailed at the same time, a range of issues can delay the mailing of some of these bills. The due date for these delayed real property tax bills is adjusted accordingly. The list of delayed bills for the 2nd half of 2009 is shown below: In Premise Address Order* In Square, Suffix, Lot Order* * This document is presented in Portable Document Format (PDF) and a PDF reader is required for viewing. Download a PDF reader or learn more about PDFs.