Property taxes are billed in the fall of the year, usually by mid September, for City Taxes that cover January 1- December 31 of that same year. The due date is 60 days from the date taxes are billed (O.C.G.A. 48-5-148). You should receive a separate statement from Cobb County for your County/State/School Taxes.
Interest accrues on the outstanding balance every month until paid in full. A 5% penalty will be charged 120 days after the due date and every 120 days thereafter, not to exceed 20% of the taxes due.