Wisconsin property tax appeals
Review the sourced process overview below, then get the Wisconsin DIY Appeal Kit with an evidence workbook, filing controls, official links, and an editable appeal letter in one PDF. No parcel-specific comps.
How a Wisconsin appeal actually works
Every statement below is cited to its primary source and shows the date we verified it. Where we could not confirm something from a primary source, we say so instead of guessing. Dataset last re-verified 2026-08-13.
Missed the main deadline? Wisconsin has 4 remedies most homeowners never hear about
County pages rarely surface these. Each one is a distinct legal route with its own clock.
Claim for excessive assessment (s. 74.37)
A written claim served on the clerk of the taxation district (or county with a county assessor system) in the manner of s. 801.11(4), stating the circumstances and the amount, signed by the claimant or agent, to recover general property tax imposed because the assessment was excessive. Requires prior compliance with s. 70.47 Board of Review procedures (except s. 70.47(13)) and timely payment of the tax. Failure to act within 90 days equals disallowance; suit in circuit court must be commenced within 90 days after receipt of registered or certified notice of disallowance. CANNOT be maintained if the same year's assessment is contested under s. 70.47(13) or s. 70.85 - these routes are mutually exclusive.
When:
primary source · verified
Palpable error refund or rescission (s. 74.33)
After the tax roll is delivered to the treasurer, the taxation district's governing body may refund or rescind a general property tax for clerical error in description or computation, improvements that did not exist on the assessment date, exempt property, property not in the district, double assessment, or arithmetic or transpositional error. Expressly NOT available where the alleged error is solely that the assessor placed an excessive valuation on the property.
When:
primary source · verified
Recovery of unlawful taxes (s. 74.35)
A claim against the taxation district by a person aggrieved by the levy and collection of an 'unlawful tax' - a tax involving one of the s. 74.33(1)(a)-(f) errors. Does not cover a claim whose sole alleged defect is excessive valuation.
Board of Review hearing waiver route to certiorari (s. 70.47(8m))
At the request of the taxpayer or assessor, or on its own discretion, the Board of Review may waive the s. 70.47(8) hearing and let the taxpayer proceed to s. 70.47(13) certiorari, issuing a s. 70.47(12) notice using the taxpayer's assessment as finalized. A waiver DISALLOWS any s. 74.37(3) excessive-assessment claim.
When:
primary source · verified
What evidence wins in Wisconsin
Wis. Stat. s. 70.32(1) requires real property to be valued per the Wisconsin Property Assessment Manual (s. 73.03(2a)) 'from actual view or from the best information that the assessor can practicably obtain, at the full value which could ordinarily be obtained therefor at private sale.' The statutory hierarchy is: (1) recent arm's-length sales of the property to be assessed, if per professionally acceptable appraisal practices those sales conform to recent arm's-length sales of reasonably comparable property; (2) recent arm's-length sales of reasonably comparable property; (3) all other factors that, per professionally acceptable appraisal practices, affect value. The Department of Revenue's 2026 Guide for Property Owners states directly: 'You should not make the mistake of comparing your assessment to other properties. To have the assessment reduced, you must prove the property is over assessed compared to sales in the municipality.' SALES evidence is required; comparing your assessment to neighbors' assessments is expressly NOT the accepted proof at the Board of Review. THIS IS THE OPPOSITE OF ILLINOIS.
primary source · verified 2026-08-12
The appeal ladder, in Wisconsin's own terms
- 1
Open Book (municipal assessor informal review)
Deadline: During the Open Book period: the assessment roll is open for examination on days named in a class 1 notice published or posted at least 15 days before the first day the roll is open; the assessor must be present at least 2 hours. Open Book must close at least 7 days before the Board of Review's first meeting (s. 70.47(1)).
Clock starts: Completion and delivery of the assessment roll to the municipal clerk, or the commissioner of assessments in 1st class cities
Wis. Stat. s. 70.45 · primary source · verified 2026-08-12
Not confirmed from a primary source: s. 70.45 prescribes no form for Open Book; changes are made informally by the assessor. No statewide Department of Revenue Open Book form located. Check the official page before relying on this.Fee: $0
Wis. Stat. s. 70.45 · primary source · verified 2026-08-12
- 2
Municipal Board of Review (town, village, or city)
Deadline: NOTICE OF INTENT: the Board of Review may not hear a valuation objection unless, AT LEAST 48 HOURS BEFORE THE BOARD'S FIRST SCHEDULED MEETING, the objector gives the board's clerk written or oral notice of intent to file an objection. WAIVERS: (a) upon a showing of GOOD CAUSE plus submission of a written objection, the board SHALL waive the requirement during the first 2 hours of the first scheduled meeting; (b) upon proof of EXTRAORDINARY CIRCUMSTANCES the board MAY waive it up to the end of the 5th day of the session, or the final day if the session is shorter (s. 70.47(3)(ak), (7)(a)). The Board itself meets annually at any time during the 45-day period beginning on the 4th Monday of April, but no sooner than 7 days after Open Book closes; each municipality sets its own dates and publishes a class 1 notice at least 15 days before (30 days in a revaluation year). 1st class cities (Milwaukee): written objections to the commissioner of assessments on or before the 3rd Monday in May, with no waiver of the writing requirement (s. 70.47(16)(a)).
Clock starts: The board of review's first scheduled meeting in the municipality
Wis. Stat. s. 70.47(1), (2), (3)(a)4., (3)(ak), (7)(a), (16)(a) · primary source · verified 2026-08-12
Form: PA-115A — Objection to Real Property Assessment official form
primary source · verified 2026-08-12
Fee: $0
Wis. Stat. s. 70.47 · primary source · verified 2026-08-12
- 3
Wisconsin Department of Revenue (review of assessment / revaluation)
Deadline: A written complaint must be filed with the Department of Revenue within 20 days after receipt of the board of review's determination, or within 30 days after the date specified on the s. 70.47(12) affidavit if there is no return receipt. Available ONLY if the taxpayer contested the assessment before the Board of Review that year, ONLY for property whose value as determined under s. 70.47 does not exceed $1,000,000, and ONLY on the ground that the assessment is radically out of proportion to the general level of assessment in the district.
Clock starts: Receipt of the board of review determination, or the date on the clerk's s. 70.47(12) affidavit
Wis. Stat. s. 70.85(1), (2) · primary source · verified 2026-08-12
Not confirmed from a primary source: s. 70.85 requires only a 'written complaint'; no prescribed Department of Revenue form number confirmed from a primary source. Check the official page before relying on this.Fee: $100 (statutory)
Wis. Stat. s. 70.85(3) · primary source · verified 2026-08-12
- 4
Circuit Court (statutory certiorari review of the Board of Review determination)
Deadline: Except as provided in s. 70.85, appeal from the determination of the board of review shall be by an action for certiorari commenced within 90 days after the taxpayer receives the notice of decision under s. 70.47(12).
Clock starts: Taxpayer's receipt of the Board of Review notice of decision under s. 70.47(12)
Wis. Stat. s. 70.47(13) · primary source · verified 2026-08-12
Not confirmed from a primary source: Certiorari is commenced by summons and complaint under general civil procedure; no assessment-specific form is prescribed by s. 70.47(13). Check the official page before relying on this.Not confirmed from a primary source: s. 70.47(13) sets no fee; the general circuit court civil filing fee (ch. 814) was not fetched and is not asserted. Check the official page before relying on this.
Who has to prove what
The board shall presume that the assessor's valuation is correct; that presumption may be rebutted by a sufficient showing by the objector that the valuation is incorrect. Related: under s. 70.49(2) the assessment is presumptive evidence that the property has been justly and equitably assessed.
primary source · verified 2026-08-12
When values are set
Property is assessed annually as of January 1 (assessment day). Separately, each taxation district must assess property at FULL VALUE at least once in every 5-year period, and the Department of Revenue escalates (notice, then special supervision under s. 70.75(3)) when a district's assessed value for each major class is not within 10 per cent of full value at least once in a 4-year window.
primary source · verified 2026-08-12
How counties differ
Board of Review dates are set MUNICIPALITY BY MUNICIPALITY - by each town, village, or city (the 'taxation district' under s. 74.01(6)), NOT by county. This is a structural difference from every other state in this region. Each Board meets at any time during the 45-day period beginning on the 4th Monday of April, but no sooner than 7 days after the last day the roll is open under s. 70.45; the municipal clerk publishes a class 1 notice at least 15 days before (30 days in a revaluation year under s. 70.05). A municipal governing body may by ordinance or resolution change the first-meeting hours (minimum 2 hours between 8 a.m. and midnight) with 15 days' notice. EXCEPTIONS: counties that have adopted a county assessor system under s. 70.99 use a county board of review that schedules meetings in each taxing jurisdiction; 1st class cities (MILWAUKEE) require written objections filed with the commissioner of assessments on or before the 3rd Monday in May, with no waiver of the writing requirement. 2026 examples of Open Book variation: the City of Green Bay Open Book was a single day, April 22, 2026; the City of Madison Open Book period was May 4-8, 2026. ALWAYS confirm the exact first-meeting date with the specific municipal clerk before counting back 48 hours - the 48-hour notice-of-intent clock is measured from that meeting, not from any statewide date.
Wisconsin appeal deadline
Deadlines varyWisconsin deadlines are set locally.
The deadline is almost always printed on the assessment notice your local assessor mails you. Use that date, it is the one that counts.
Are you missing a Wisconsin exemption?
Exemptions cut your bill before any appeal even starts, and most homeowners never claim all the ones they qualify for. Answer four questions:
Is your Wisconsin home over-assessed?
The whole appeal hinges on one comparison: your assessed value (from your tax notice) versus your home's market value (what it would sell for today). Put both in:
How to find your home's real market value (free) →
- Pull free estimates. Look up your address on Zillow (“Zestimate”) and Redfin (“Redfin Estimate”). Average them, algorithms run high or low, so two beats one.
- Find 3-5 real comparable sales. Same neighborhood, similar size, beds/baths, age, and condition, sold in the last 6-12 months. Recent sales (not listings) are the strongest evidence a board will accept.
- Adjust for differences. Knock value off comps that are bigger or renovated; add for ones that are smaller or dated, so you're comparing like-for-like.
- Compare to your assessment. If your assessed value sits clearly above that adjusted market figure, you have grounds to appeal.
One catch: some states assess at a fraction of market value (an “assessment ratio”). If your notice shows a ratio or an “equalized” value, compare your implied full value to market, not the raw assessed number.
How property tax appeals generally work
Most states follow the same basic path: your local assessor mails an assessment notice with a value and a deadline; you file an appeal (often called a protest, grievance, or petition) before that deadline; you present comparable sales of similar homes; and a local board reviews the evidence and can lower your value.
The exact form, deadline, and board can vary by county. Use the current assessment notice and the official sources linked above to confirm the controlling local requirements. The paid kit organizes that verification, the evidence, the filing steps, and your editable letter in one place.
Want to see the depth we build per state? Take a look at our Texas, Florida, and Georgia guides.