Johnson County property taxes must be paid by Sept. 30, 2024; late payment penalties begin Oct. 1.
The first installment of Johnson County property and mobile home taxes are due on Sept. 30, 2024. Payments must be delivered to the Treasurer’s Office, paid online or postmarked by Sept. 30 to avoid a 1.5% monthly penalty that will begin Oct. 1.
In-person payments must be made at the Treasurer’s Office, located on the first floor of the Johnson County Administration Building, 913 S. Dubuque St. in Iowa City. Business hours are Monday through Friday, 8 a.m. to 5 p.m. The Treasurer’s Office will be closed Monday, Sept. 2 in observance of the Labor Day holiday.