The first installment of Johnson County property and mobile home taxes is due on Sept. 1, 2025. Other than tax sale redemptions, 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. The U.S. Postal Service postmark is the only date recognized for date of mailing. The date written on a check, or a business metered date, cannot be accepted as proof of the mailing date. Residents who would like a receipt must include a self-addressed stamped envelope with their payment.
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. 1, in observance of the Labor Day holiday.
To make an online payment, visit https://pay.iowataxandtags.org. You can pay with an e-check, debit card or credit card. Those methods of payment, whether online or at the Treasurer’s Office, are subject to a convenience fee. Iowa Tax and Tags now has customer accounts to manage property tax, receive reminders about upcoming bills and schedule future payments. Contact the Treasurer’s Office at 319-356-6087 if you have questions about Iowa Tax and Tags customer accounts.
County Treasurers collect property taxes on behalf of all jurisdictions in the county and then distribute the taxes collected to the other jurisdictions, including the property owner’s city of residence, school district and other taxing bodies in the county.
Questions about payments should be directed to the Treasurer’s Office at 319-356-6087 or [email protected]. Additional information about property taxes is available at