April 27, 2026
To: General Assessors
Certified Assessors
The Wisconsin Department of Revenue (DOR), State and Local Finance Division posted the 2026 Municipal Assessment Report (MAR) on our
website.
General filing information
- Due date – June 8, 2026
- Assessor must e-file through
MyDORGov
- Review – filing
instructions and
tips
- Law changes – the information below is based on current state law. DOR will provide updated information if there are changes to state law.
Municipal Assessment Report (MAR)
Report type – depends on the Board of Review's (BOR) status:
- Estimated MAR
- If the final BOR does not adjourn by June 8, 2026 – file an estimated MAR by June 8, 2026
- Final MAR – submit:
- If BOR adjourns by June 8, 2026
- If BOR adjourns after June 8, 2026 – file within 10 days after the final adjournment
- Amended MAR
- If you already filed a final MAR – only submit an amended MAR to update your final report
- Submit by January 31, 2027
Late filing or non-filing
If you do not file by June 8, 2026, the following may occur:
- Municipality receives a reduced levy limit due to the lack of new construction information
- If the municipality has TIF districts – prior year's non-manufacturing full value is certified for the current year, which may result in less tax increment dollars available to the municipality
-
Note: If you file an estimated MAR by June 8, 2026, and
do not file a final MAR by December 31, 2026:
- Equalization Bureau will file a formal complaint against your certification with the Education and Certification section in the Office of Technology and Assessment Services
- This could result in assessor misconduct under state law (sec. 946.12(1), Wis. Stats.)
Filing tips
- You must complete the email authorization step to access the form; the authorization link is valid for 30 days
- Save your MAR periodically as you complete it
- Form must be error-free to submit
- After submitting a MAR, print and/or save a copy to your local computer:
- Ensures confirmation number and submission date is saved with the form
- DOR uses the confirmation number for questions about a report
Net New Construction Report
- August 2026 Net New Construction Report – only reflects values reported by June 8, 2026
- Updated values provided after June 8, 2026 – reflected in the 2027 Net New Construction values
Questions?
Contact the
Equalization Bureau District Office in your area.