2026 fiscal calendar
Know the tax date before it becomes a penalty date.
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The verified record below separates published figures from dates that require confirmation with St. Croix County Treasurer and Real Property Lister/GIS; municipal assessors perform local valuation.
Effective rate
no single countywide effective property-tax rate is published; Wisconsin rates vary by municipality, school district, and other taxing jurisdictions.
Statement mailing
Mid-December 2026 — St. Croix County states current-year tax bills are mailed in mid-December; no exact 2026 mailing day was published.
Payment deadline
For the 2026 Wisconsin property-tax year (bills mailed in December 2026 and payable in 2027), full payment or the first installment is due January 31, 2027 to the local municipal treasurer; the second installment is due July 31, 2027 to the county treasurer. Missed installments become delinquent and accrue Wisconsin statutory interest and penalty.
Valuation protest
Exact 2026 dates are municipality-specific, not countywide. Wisconsin DOR's 2026 Open Book/Board of Review calendar says sessions generally occur late May through mid-June, though some are later. Give written or oral notice of intent to object at least 48 hours before the first Board of Review meeting and file Form PA-115A before or during the first two hours of that meeting; local clerk and assessor details are in the DOR 2026 calendar.
Critical payment warning
Do not assume a grace period.
The verified county record identifies the payment timing above but does not establish a universal penalty schedule for this page. Late charges, interest, collection costs, tax-sale procedures, and lien or foreclosure timelines can depend on state law and the local collector’s process. If the deadline is close or a balance is delinquent, contact the tax collector directly and request the current payoff amount in writing.
Treat the published payment deadline as a hard operational date and retain your receipt or confirmation number.
Read the calendar in order
From assessment to collection
1. Valuation and notice
Review the assessment notice as soon as it arrives. The protest window may run from the notice date rather than from the payment due date.
2. Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
3. Payment confirmation
Use the official collector channel, then save the receipt, transaction reference, and date posted. A bank submission is not always the same as a county posting date.