The final tax rate for the current year will be set by the City Council in late November. The Clerk-Treasurer's Office will mail tax bills during the first two weeks of December. Taxes are paid to the Rock County Treasurer.  Tax payments can be mailed or delivered to:

Rock County Treasurer

51 S. Main St.

Janesville, WI, 53545

First installment payments are due by January 31 and the balance is due by July 31. Please make checks payable to the Rock County Treasurer.

You can also pay your tax bill online: https://www.govtechtaxpro.com/

Please note, Rock County will no longer send receipts to customers who mail in their payments; cancelled checks will serve as proof of payment. If a written receipt is needed, a self-addressed stamped envelope must accompany the payment. Contact the Clerk-Treasurer's office if you have a question regarding your tax bill. Individuals wishing to obtain previous tax bills may search by property using search by property using eGov.

Lottery Tax Credits

Each year homeowners are able to claim a lottery tax credit on the first installment of their property tax bill. These credits are made available through the revenues from the state lottery, pari-mutuel on-track betting and bingo.

To be eligible for lottery tax credits this year, you must have owned and resided in your home on January 1 of the current year. This residence also must be where you live for more than six months of the year. Vacation homes, rental homes, businesses and bare land do not qualify for this credit. If you purchased your home after January 1, there are a limited number of circumstances that will allow you to receive the credit this year.

The credit amount varies by year and will not be determined until the end of November. For questions, to sign up for the credit or if the credit is not showing on your tax bill, please contact the City Clerk-Treasurer's office or the Office of the County Treasurer, phone (608)757-5670.