The City of Janesville Assessor’s Office is working on the next citywide property revaluation. The last full revaluation was completed in 2023, and current estimates show that the average property assessment will increase by about 25%.

All property owners will receive a Notice of Assessment Change by May 2027. This notice will show your previous assessment and your new proposed assessment for 2027.

To prepare for the revaluation, the Assessor’s Office is collecting market information through December 2026. State guidelines say that assessed values shall fall between 90% and 110% of actual sale prices. Janesville’s current ratio, based on 2025 sales, is 83.04%, which shows that assessments need to be updated.

Revaluations do not raise or lower the total amount of taxes collected. Instead, they make sure each property is taxed fairly based on its market value.

• If your assessment goes up more than the average, your taxes may increase.
• If your assessment goes up less than the average, your taxes may go down.
• If your assessment changes about the same as the average, your taxes should stay roughly the same.

Residents can find helpful tools and answers to common questions about the revaluation on the City’s website at janesvillewi.gov/revaluation. Information will be updated as the process continues.

If you have questions, please contact the Assessor’s Office at (608) 755-3045.