Annual tax bills are due September 30th.
First semi-annual installments are due September 30th.
Second semi-annual installments are due December 31st
 

If you received another bill, it is most likely because there has been an adjustment to your account. These adjustments could be for tax credits, increased assessments, abatements, or other changes which result in either a supplemental tax bill or a revised tax bill.

Annual tax bills and the first installment of semi-annual bills are due on or before September 30th and become delinquent on October 1st. The second semi-annual installment is due December 31st and becomes delinquent January 1st. Delinquent tax bills are subject to interest and penalty at the rate of 1 2/3% (1.667 per month on the unpaid balance) per month until paid in full. The total late charge is 20% annually as set by Resolution following County Council action, and which is composed of 8% interest and 12% penalty. Interest and penalty are calculated on the net amount of the bill, after any credits are applied. Delinquent taxes will result in the sale of the property tax lien through a public tax lien sale on the second Monday in June of the subsequent calendar year. Taxpayers receive a delinquency or tax lien sale notice in April. Accounts eligible for the tax lien sale are listed for four consecutive weeks preceding the tax lien sale in a Montgomery County newspaper and are subject to a $50 advertising fee. Property tax accounts taken to tax lien sale may be subject to additional legal costs that are incurred by the new tax lien certificate holder.