The information on this page will help you understand how the assessor determines the Real Market Value and Assessed Value for each property in Multnomah County.

The amount of taxes you owe is based on these values. To understand how your tax bill is calculated, visit Property Tax Information.

Look up your property value

Check your property value, taxes due, property description, and much more at www.MultCoPropTax.org.

  • Use the “Guest Login” button to search by Property Account Number (e.g. R176816) or street address. You do not need a password to log on as a guest.

  • Expand your search capabilities with subscription access.

History of property values and taxes

See a graph of the last five years of your property value and taxes.

Frequently Asked Questions

Why is there an appraiser at my house?

How is my Assessed Value (AV) determined?

How is my Real Market Value (RMV) determined?

How is my Maximum Assessed Value (MAV) determined?

Why did my Assessed Value increase so much?

What is an Exception event?

What is ongoing maintenance?

I recently bought my house and have not done any work to it.  Why was Exception value added?

What property does Multnomah County assess?

Why do I receive multiple tax bills when I only have one property?  Interested in consolidating your property?

How do I find my property ID/Account number?

Why is there an appraiser at my house?

Appraisers might visit your property to

  • verify the terms and conditions of a recent sale

  • verify and/or update the property characteristics

  • appraise new construction

  • appraise remodels and additions

  • appraise property for removal of exemptions or adjudications from prior appeals

This is not an all-inclusive list. Appraisers may visit property for other reasons. 

Generally, appraisers will leave a business card on the front door. If you have received a business card, contact the appraiser directly at the mobile number or email address listed on the card with questions regarding their visit.

For information about a specific property, please contact our customer service department by live chat, phone (503) 988-3326 or by email at dartcs@multco.us.  Have your account number or property ID available. To learn about how your taxes are calculated, visit Property Tax Information.

How is my Assessed Value (AV) determined?

Assessed Value (AV) is the lower of last year’s Maximum Assessed Value (MAV) plus 3%, or the current Real Market Value (RMV). This value provides the baseline for your tax bill calculation.

How is my Real Market Value (RMV) determined?

Real Market Value (RMV) is typically the price your property would sell for in a transaction between a willing buyer and a willing seller on January 1, the assessment date for the tax year.

To estimate the initial RMV for your property, your county assessor appraises your property using a physical inspection and a comparison of market data from similar properties. For ensuing tax years, your county assessor may study trends of similar properties to update the RMV for your property.

How is my Maximum Assessed Value (MAV) determined?

Maximum Assessed Value (MAV) was established by Ballot Measure 50 for the 1997-98 tax year. MAV is the greater of 103% of the prior year's assessed value (AV), or 100 percent of the prior year's MAV, whichever is greater.

MAV’s for properties that existed prior to 1995 were set based on the 1995-1996 Real Market Value (RMV) less 10%. MAVs for “new” properties (constructed or created after 1995) are set by multiplying the property's Real Market Value (RMV) at the time of construction or creation by the Changed Property Ratio (CPR) for that year.

MAV is the only part of your tax bill where a 3% increase limit applies. However, your MAV can increase above 3 percent of the prior year's assessed value if certain things defined as exceptions are made to your property.

Maximum assessed value does not appear on your tax statement.

Why did my Assessed Value increase so much?

Your Assessed Value (AV) can increase for two reasons:

  1. An Exception Event (see below)

  2. If your previous year’s Real Market Value was lower than your Maximum Assessed Value and now your Real Market Value is more than your Maximum Assessed value, you may see a jump in your Assessed Value, depending on how low your RMV was in previous years.

See a graph of the last five years of your property value and taxes.

For information regarding the Assessed Value for a specific property, please contact our customer service department by live chat, phone (503) 988-3326 or by email at dartcs@multco.us.  Have your account number or property ID available.

What is an Exception event?

Ballot Measure 50 limits MAV increases to 3% per year except under certain circumstances including, but not limited to:

  • New Construction/Additions of more than $10,000 in one year or $25,000 over 5 years

  • Remodel or significant rehabilitation of more than $10,000 in one year or $25,000 over 5 years

  • Partitioning or subdivision

  • Rezoning (where the property is used consistently with the new zoning)

  • Discovery of omitted Property

  • Disqualification from exemption or special assessment

In these cases, the Assessor appraises the property to determine how much Real Market Value was added by the change(s) to the property.

What is ongoing maintenance?

General ongoing maintenance and repair--such as replacing a roof with a new roof made with the same quality materials as the original roof--do not qualify as Exception events.

I recently bought my house and have not done any work to it.  Why was Exception value added?

Property values and taxes on real property are tied to the property, not the owner. The previous owner may have done work to the property that was discovered at the time of sale.

What property does Multnomah County assess?

  • Real Property - Residential, commercial, multifamily and industrial land and buildings.
  • Business Personal Property - Includes furniture, fixtures, and equipment used in a business.
  • Floating Property - Houseboats, boathouses, moorages and slips.
  • Manufactured Structures

Find your Account Number/Property ID

Your account number is the same as your property ID. It is listed at the top and the bottom of your tax statement.

Top of your tax bill:

Bottom of your tax bill: