Paying My Tax Bill

Real Estate and Personal Property tax bills are mailed out to property owners mid-December. 


To view Current and Past Payment History visit Rock County Tax Database Search  this allows community members to see if payments have been applied to their tax bills.  Click on "Tax Database Search" - Type in the property address, parcel number or Tax ID number.

If you have questions about the tax database, or payments- Contact the Rock County Treasurer's Office 608-757-5670

Tax Payment Information

Tax bills can be paid in person, by mail, or by using the drop box located directly outside of the Rock County Treasurer’s office located at 51 S Main Street in Janesville, Wisconsin 53545.  They can also be reached by calling (608) 757-5670 between 8:00 AM – 5:00 PM, Monday through Friday.

The City of Beloit has two payment options for Real Estate taxes:
Full payment option: 
     By January 31 –Pay the total amount due on the tax bill 
Installment option: 
     By January 31 – ¼ of tax plus total of any special assessments/charges.
     By March 31 – ¼ of tax 
     By May 31 – ¼ of tax 
     By July 31 – ¼ of tax 
If you choose to pay in installments, please remember that you must meet the required installments  due dates to remain on the plan and avoid penalty.  If any portion of the installment is paid late the installment option is forfeited and the entire balance of the real estate tax bills becomes delinquent and is subject to interest and penalty. 

Delinquent taxes are subject to interest and penalties totaling one and one half percent per month computed back to February 1st. (example-a late payment in May is subject to interest and penalties of 6%).   

All Personal Property taxes are due in full by January 31 except buildings on leased land which have the four (4) installment option.

By Mail

If paying by mail, make your check payable to the Rock County Treasurer, 51 S Main Street, Janesville, WI  53545.  Indicate on your payment the parcel number you are paying. If you are paying on multiple parcels, please indicate the amount you are paying on each parcel.  Also include a self addressed stamped envelope if you are requesting a receipt.

In Person

If paying in person we are located on the second floor in the Rock County Court House, 51 S Main Street, Janesville.  The County Treasurer’s office is open from 8:00 a.m. to 5:00 p.m. (Due to the recent influx of counterfeit money in the area, the County Treasurer is asking taxpayers to pay by check or money order.  Staff will be examining all currency, which can be quite time consuming.)


Tax bills can also be paid by credit card or E-Check for a fee.  Click [here] for more information.