As required by Ohio Revised Code section 323.121:
A late payment penalty of 5% is added to past due current year taxes, provided that the balance due is paid in full within the first ten days following the due date. Otherwise, a full 10% penalty is added.
You may file an Application for Remission of Penalty with the Treasurer's Office. By law, penalties can only be remitted in certain circumstances.
Interest is added twice a year: