Rate Breakdown

Property taxes in Rock County are calculated by multiplying the assessed value (minus exemptions) by the total local millage rate.

How Property Tax Works in Rock County

Property taxes in Rock County are calculated based on the assessed value of your property and the millage rate applied by local taxing authorities. The Rock County Assessor's Office determines the fair market value of your property, which is then adjusted to its assessed value (typically 100% of fair market value). This assessed value is multiplied by the millage rate (or tax rate), which is set by local governments, school districts, and other taxing entities. The millage rate is expressed in "mills," where one mill equals $1 of tax per $1,000 of assessed value. Your total property tax bill is the sum of these calculations for all applicable taxing jurisdictions.

Available Exemptions

Rock County offers several property tax exemptions to qualifying residents. These exemptions can reduce your taxable property value or provide credits on your tax bill. Available exemptions include:

• Homestead Exemption: Available to homeowners who use their property as their primary residence.
• Senior Citizen Exemption: Provides relief for homeowners aged 65 or older with income below a certain threshold.
• Disability Exemption: Offers reductions for individuals with disabilities who meet specific criteria.
• Veteran Exemption: Available to veterans with service-connected disabilities or those who served during specific wartime periods.

Applications for exemptions must be submitted to the Rock County Treasurer's Office with supporting documentation.

Payment Schedule & Deadlines

Property tax bills in Rock County are typically mailed in December, with payments due in two installments. The first installment is due by January 31, and the second installment is due by July 31. If these dates fall on a weekend or holiday, the deadline is extended to the next business day. Homeowners can choose to pay their taxes in full by January 31 or opt for the installment plan. Late payments incur penalties and interest, which start accruing immediately after the deadline. Failure to pay property taxes can result in a tax lien or foreclosure on the property.

Appealing Your Assessment

If you believe your property has been assessed incorrectly, you have the right to appeal. The appeals process in Rock County begins with contacting the Rock County Assessor's Office to discuss your assessment. If unresolved, you can file a formal appeal with the Board of Review, typically within a specified timeframe after receiving your assessment notice. Prepare evidence such as recent appraisals, comparable property values, or photos of property damage to support your case. The Board of Review will review your evidence and make a determination. If dissatisfied with the outcome, you may further appeal to the Wisconsin Department of Revenue or circuit court.