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 Union County Assessment Office.
Effective rate
Union County's 2026 county, municipal, and school millage varies by taxing district; the official Assessment page links Current Millage Rates.
Statement mailing
the official Union County 2026 assessment and tax-collector pages do not publish one countywide tax-bill mailing date.
Payment deadline
current taxes are collected by local tax collectors and delinquent taxes by the Union County Tax Claim Bureau; the official county pages do not publish a uniform 2026 discount/penalty schedule.
Valuation protest
September 1, 2026 for annual assessment appeals; a change-of-assessment appeal may be filed within 40 days of the assessment value-change notice. The Board of Assessment Appeals hears residential, commercial, Clean and Green, Homestead, and tax-exempt appeals.
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.