Mercer County, Ohio property-tax payment and appeal deadlines
Tax bills, payment rules, and valuation-review windows are controlled by the local jurisdiction and the governing state framework. The reviewed record below separates published figures from items that still require confirmation with Mercer County Auditor (Jeffrey S. Larmore) / Mercer County Treasurer.
Rate context
Confirmno single countywide effective average published; Ohio property-tax rates vary by tax district, school district, municipality, and voted levies.
Statement mailing
Published2026 schedule: first-half bills mailed January 16, 2026; second-half bills mailed by June 26, 2026.
Payment deadline
Published2025 real-estate taxes payable in 2026: first half due February 20, 2026; second half due July 27, 2026.
Valuation protest
PublishedJanuary 1–March 31, 2027 for 2026 valuation complaints; Mercer County states complaints for tax year 2026 may be submitted during that period. For the 2025 tax year payable in 2026, the prior window was January 1–March 31, 2026.
Do not assume a grace period.
The reviewed 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 a published payment deadline as a hard operational date and retain your receipt or confirmation number.
From assessment to collection
01Valuation 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.
02Statement and account review
Match the tax statement to the parcel or account number and confirm exemptions, assessed value, taxing units, credits, and balance.
03Payment 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.