How to Appeal Your Property Tax in Wisconsin
Wisconsin homeowners can appeal their property tax assessment if they believe it's too high. This guide covers the 2026 appeal deadline, required evidence, and step-by-step process.
2026 Appeal Deadline: First Monday in May
Don't miss your window. Missing the deadline means waiting another full year.
How Wisconsin Assesses Property
Wisconsin assesses residential property at 100% of market value.
Wisconsin assesses property at 100% of full (market) value.
The Appeal Process
Appeals are heard by the Board of Review. An informal review is available before filing a formal appeal.
Assessor (Open Book)
Board of Review
Circuit Court
Wisconsin Appeal Deadline
What Overassessment Costs Wisconsin Homeowners
The median home in Wisconsin is worth $228,000. If your assessment is just 10% too high, you may be overpaying:
~$367/year
Effective tax rate: 1.61% · Median value: $228,000
Check Your Wisconsin Assessment
Enter your address to see your estimated overassessment and Wisconsin filing deadline.
Wisconsin Counties
Dane County
Median: $304,700 · Rate: 2.02%
Deadline: After Board of Review
→ View Guide
Milwaukee County
Median: $232,500 · Rate: 1.81%
Deadline: The third Monday in May
→ View Guide
Waukesha County
Median: $363,200 · Rate: 1.34%
Deadline: At least 48 hours before the first meeting of the Board of Review
→ View Guide
Guides & Resources
Property Tax Appeal Resources
Best Appeal Services Compared
7 companies compared — pricing, coverage, and pros/cons for 2026.
2026 Appeal Deadlines
Every state's deadline, filing method, and what happens if you miss it.
Assessment Ratios by State
Every state's assessment percentage — from 4% to 100% — with worked examples.
9 Ways to Lower Your Property Taxes
From homestead exemptions to formal appeals — every method that works.
Savings Calculator
Check if you're overassessed — enter your assessed value to see potential savings.