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Clackamas County, OR

Clackamas County property tax appeal 2027: deadline, forms and how to file

Scan from recent salesFacts not yet verified by a person — confirm on your notice

To appeal a Clackamas County assessment, file with the Clackamas County Property Value Appeals Board; in Oregon the deadline is December 31, after tax statements mail in October. Confirm the exact date on your notice or with the assessor; we add each county's 2027 date here when it is published.

Data as of 20 Oct 2026 · the Clackamas County assessor
Your home

Check your own assessment

Free. We compare the value on your notice with recent sales of similar homes nearby and tell you whether an appeal is worth filing. Have your assessment notice and tax bill handy.

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How to file

How to file in Clackamas County

  1. Step 1

    File the appeal

    Use the method your notice lists, by the deadline on the notice.

  2. Step 2 · before the hearing

    Prepare and submit your evidence

    Comparable assessed values, photographs of condition issues and recent sales where they are public. Ask the appraisal office for the evidence it will use.

  3. Step 3

    Meet, then hear

    An informal review usually comes before a formal hearing; most reductions happen at the informal stage.

Before you file: how to read your notice · evidence that works · informal vs formal hearing · when not to appeal

Questions

Clackamas County questions

Data as of 20 Oct 2026 · Oregon statutes
When is the property tax appeal deadline in Clackamas County?

Oregon law sets it: From the date tax statements are mailed through December 31 (ORS 309.100(2)). Confirm the exact date on your notice or with the assessor.

Who hears a appeal in Clackamas County?

The Clackamas County Property Value Appeals Board hears the first appeal. Filing rules: ORS 309.100.

What value should I compare on my Oregon notice?

The figure labeled “Real Market Value”. Oregon appeals are argued against market value as of January 1, 1:00 a.m. of the assessment year (ORS 308.210).

Does Oregon cap assessment increases?

Maximum assessed value may rise no more than 3% a year, except for new property or improvements, partitions and rezoning (ORS 308.146; Or. Const. art. XI, §11). Applies to all property, not only homesteads.

Your home

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Nearby

Nearby counties

Marion County · Multnomah County · Hood River County · Linn County · Wasco County · Washington County · Yamhill County

Sources
  1. ORS ch. 308 (308.146, 308.205, 308.210, 308.232)
  2. ORS ch. 309 (309.020, 309.026, 309.100)
  3. ORS ch. 311 (311.250 tax statement)
  4. ORS ch. 93 (93.030 consideration on conveyance)
  5. U.S. Census Bureau, county population estimates (2024) and county gazetteer (2024).