Travis Bunn
Founder, AppealDesk · Published February 25, 2026 · Updated March 30, 2026
Your appeal starts with one number: what the county says your home is worth. See yours before you write a word.
Free to check. No account needed.
Wisconsin property owners can appeal their property tax assessment. The filing deadline is Wisconsin's deadline is not a fixed statewide date -- it is tied to.... Wisconsin does not publish statewide success rate data for Board of Review outcomes. Because each municipality runs its own Board of Review independently, there is no centralized reporting of appeal results.
This comprehensive guide walks you through the entire Wisconsin property tax appeal process, from gathering evidence to presenting your case to the Board of Review.
Filing window: Wisconsin's deadline is not a fixed statewide date -- it is tied to each municipality's Board of Review schedule:
1. Open Book period: Typically held in April through May (varies by municipality). This is an informal session where you can discuss your assessment with the assessor. No formal filing required.
2. 48-hour notice of intent: You must provide written or oral notice to the municipal clerk at least 48 hours before the first scheduled Board of Review meeting that you intend to file an objection.
⚠️ Missing the deadline means waiting another year and paying higher taxes. Mark your calendar now!
Your assessment notice shows your property's taxable value. Look for the "assessed value" or "market value", this is what you're appealing. Compare it to recent sales of similar homes in your neighborhood.
The 1. Board of Review wants to see hard data, not opinions. Focus on:
Submit your appeal to the 1. Board of Review before the deadline. Most Wisconsin counties now offer online filing, but some still require paper forms. Include all your evidence with the initial filing when possible.
If your appeal goes to a hearing, you'll typically have 5-15 minutes to present. Organize your evidence clearly, practice your key points, and prepare to answer questions about your property value.
Present your evidence professionally and stick to facts about market value. The board members are usually reasonable people, they just need solid evidence to justify a reduction.
Wisconsin has the most compressed and procedurally demanding appeal timeline of any state. The combination of the 48-hour advance notice requirement and the rule that the formal objection must be filed within the first two hours of the BOR's first meeting creates a window so narrow that missing it by even a day means waiting an entire year. No other state imposes both a mandatory pre-meeting notice and a same-day filing deadline within the opening hours of a single meeting.
The saving grace is the Open Book session that precedes the Board of Review. During Open Book, the assessment roll is made available for public inspection, and property owners can sit down informally with the assessor to discuss their valuation. Many corrections are made at this stage without any formal paperwork. If the assessor agrees your value should change, they correct the roll on the spot. This two-phase system (informal Open Book followed by formal BOR) means Wisconsin's process is actually more accessible than it appears on paper -- but only if you participate in both phases. Property owners who skip Open Book and go straight to the BOR often find themselves at a disadvantage because the assessor may have already addressed certain issues informally. Wisconsin also requires that for objections based on comparable sales, the property owner must provide evidence of recent arm's-length sales -- the BOR will not do the research for you.
Wisconsin has no cap on individual property assessment increases. Properties are assessed at 100% of fair market value, and there is no statutory limit on annual increases to individual assessments. Wisconsin does impose levy limits on counties and municipalities -- local governments generally cannot increase their total property tax levy by more than the percentage of net new construction in the municipality, effectively limiting the growth of the total tax levy. However, this is a government revenue limit, not an individual assessment cap. School districts have separate revenue limits. Voters can approve referenda to exceed levy limits.
Form PA-115A: Objection to Real Property Assessment -- published by the Wisconsin Department of Revenue. This is the standard written objection form that must be completed, signed, and filed with the BOR clerk. For personal property, use Form PA-115B. Both forms are available at revenue.wi.gov/dorforms/. Note: The 48-hour notice of intent to file has no prescribed form -- it can be written or oral.
Wisconsin Department of Revenue, Division of State and Local Finance
Phone: 608-266-2772 (general); 608-261-5167 (State and Local Finance)
AppealDesk creates professional evidence packets specifically for Wisconsin property tax appeals. We analyze your property, find the best comparables, and build a compelling case, all for a flat $49 fee.
Enter your address to pull your county record free. No account needed.
The 1. Board of Review is looking for objective evidence that your property is overvalued. The strongest cases combine multiple types of evidence:
❌ Missing the deadline
Wisconsin has strict filing deadlines with no extensions. Set multiple reminders!
❌ Using weak comparables
Properties must be truly similar, same neighborhood, size, age, and condition
❌ Being unprepared
Board members ask questions. Know your evidence inside and out
❌ Getting emotional
Stay professional and factual. The board responds to data, not frustration
❌ Giving up after denial
Many successful appeals happen at the state level after local denial
Every year an inflated assessment stands is another year of paying on it, and the county does not back-date a correction. What an appeal is worth depends on how far off your own number is, which is exactly what the free check below shows you.
Free to look. If the number is too high, your $49 packet has the comparable sales, forms, and filing steps.
Follow this timeline to maximize your chances of success:
Today
Check your assessment and calculate potential savings
This Week
Research comparable sales and gather initial evidence
Next Week
Complete and file your appeal application
Before Hearing
Organize evidence and practice your presentation
A successful appeal is just one way to lower your Wisconsin property taxes. These additional strategies can stack with your appeal for maximum savings.
Wisconsin uses a two-step process. Open Book is an informal session where you discuss your assessment with the assessor. Many disputes resolve here without formal filing. Attend Open Book first -- then file with the Board of Review within 30 days if unresolved.
Wisconsin's Homestead Credit provides up to $1,168 for homeowners and renters with income under approximately $24,680. Credit equals a percentage of property taxes exceeding a percentage of income. Filed on your state income tax return.
The School Levy Tax Credit is applied directly to your tax bill using state lottery proceeds. You don't apply -- it's automatic. But verify it appears on your bill. The amount varies by municipality.
Wisconsin limits annual levy increases to the percentage of net new construction. Existing properties don't drive levy increases. But your individual assessment can still increase. Appeal if your assessment exceeds market value.
Wisconsin assesses at 100% of fair market value. Compare your assessed value directly to recent comparable sales. If your assessment is higher, you have a straightforward case.
Recent legislative changes in Wisconsin may affect your property tax bill and appeal strategy.
Wisconsin imposes state levy limits on municipalities and counties, restricting annual levy increases to the percentage increase in net new construction (not general property value appreciation). This means existing properties don't drive levy increases -- only new development does. Schools have separate limits tied to per-pupil revenue caps.
The School Levy Tax Credit is applied directly to your property tax bill -- you don't need to file for it. It reduces the school portion of your tax bill using state lottery proceeds. The credit amount varies by municipality.
Most Wisconsin property tax appeals are resolved within 60-120 days of filing. Initial reviews may happen within 30 days, while formal hearings typically occur 60-90 days after filing. Complex cases can take longer.
Yes! You have the right to appeal annually if you believe your property is overassessed. Many successful appellants file every year to maintain their reduced assessments. Each year requires new evidence based on current market conditions.
No, you don't need legal representation for residential property appeals. The process is designed for property owners to navigate themselves. However, having professional evidence and a well-organized presentation significantly improves your chances.
Unfortunately, missing the deadline usually means waiting until next year. Some Wisconsin counties may allow late filing for "good cause" (like medical emergencies), but this is rare and requires documentation. It's best to file early!
Successful Wisconsin appeals typically achieve 8-20% reductions in assessed value. For a $400,000 home, that's $32,000-$80,000 less in taxable value, saving you $400-$1,000+ annually depending on your local tax rate.
Your appeal is only as good as the evidence behind it. Pull your county record free, and if the number looks too high, the $49 packet gives you the comparable sales, the forms, and the filing steps.
A real AppealDesk order, Dane County
In May 2026, a homeowner in Dane County ran the check. The county had their home on record at $602,900, while recorded sales of comparable homes supported about $495,861: an over-assessment of $107,039, worth roughly $1,832 per year if corrected. Their packet laid out the comparable sales, the forms, and the filing steps. Nobody at the county was ever going to run that check for them.
You now know how the process works. The part it turns on is your own number: what the county has your home on record at, and whether recorded sales nearby actually support it.
Free county record lookup. The $49 packet follows only if the number is worth challenging.
⏱️ Evidence packets delivered instantly (within 5 minutes)