Real estate agents
How do I appeal my property assessment in the City of Madison?
A common question, answered by the MadisonWI.com editors · November 13, 2026
1 answer
From MadisonWI.com
The City of Madison Assessor's Office runs the process each spring. In 2026, assessment notices were mailed May 1, and an Open Book period (May 4 to 8) let owners get factual errors fixed, such as a wrong room count. If the facts are right but you think the value is wrong, you had to file an objection form by May 15, 2026 at 4:30 p.m. The Board of Assessors then reviews every objection. If you disagree with its decision, you can take your case to the Board of Review, a group of appointed City residents. Miss the objection deadline and you must ask the Board of Review for a waiver. Commercial and multi-unit properties have extra paperwork. For questions, email openbook@cityofmadison.com or call 608-266-4531. Check the Assessor's page for next year's dates. This covers the City of Madison only. Source: City of Madison Assessor's Office, Open Book & Assessment Appeals (checked November 2026).
Written by the MadisonWI.com editors · November 13, 2026