Columbia County, Oregon 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 Columbia County Assessor / Department of Taxation.
Rate context
Confirmno single countywide effective property-tax rate is published; Oregon tax rates are district-specific.
Statement mailing
Confirmthe county's official sources reviewed do not publish an exact 2026 mailing date.
Payment deadline
PublishedFor Oregon tax year 2026-27: full payment or 2/3 payment is due November 15, 2026, observed November 16, 2026 because November 15 is Sunday; the remaining 1/3 installment is due February 15, 2027, observed February 16, 2027 because February 15 is a legal holiday; the final 1/3 is due May 15, 2027, observed May 17, 2027 because May 15 is Saturday. Full payment receives a 3% discount, 2/3 payment a 2% discount, and installment payments no discount.
Valuation protest
PublishedFor the 2026 tax year, file with the county Property Value Appeals Board after the 2026 tax statement is mailed (generally October 2026) and no later than December 31, 2026; if December 31 falls on a weekend or legal holiday, the deadline moves to the next business day.
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.