Portland Property Taxes Explained

Oregon calculates property taxes differently than most states, and it catches buyers off guard more than almost any other part of the process. Here is how the system actually works, and what it means when you are budgeting for a home. 

Working through the numbers is part of every buyer conversation, especially when it comes to Oregon's property tax system

Two Values, Not One

Every property in Oregon carries two numbers on the county tax roll: real market value, which is roughly what the home would sell for, and maximum assessed value, which is what your tax bill is actually based on. You pay taxes on whichever of the two is lower, and in most cases, that is the assessed value.

How Measure 50 Set the Rules

Oregon voters passed Measure 50 in 1997, which reset every property's assessed value to 90 percent of its 1995-96 value and capped future growth at 3 percent per year. That cap applies regardless of how much the home actually appreciates in the market. A separate measure, Measure 5, limits the tax rate itself to $10 per $1,000 of real market value for general government and $5 per $1,000 for education, with any excess reduced through a process called compression.

Why This Matters More Over Time

Because the 3 percent cap compounds annually and is not tied to sale price, the gap between assessed value and market value widens the longer a property is owned. A home bought decades ago can carry an assessed value tens of percentage points below what it would sell for today, while a home that changed hands recently, or one with recent additions or a remodel, tends to sit much closer to market value. Unlike some states, Oregon does not reset assessed value when a property sells. The 3 percent cap carries forward under the new owner, which means the home's tax history matters more here than in states where a sale triggers reassessment.

What Can Push Assessed Value Up Faster

• New construction, including an added ADU, is assessed separately and can raise the taxable value beyond the standard 3 percent cap.
• Significant remodels or additions can trigger a reassessment of the improved portion of the property.
• Rezoning or subdividing a lot can also result in an assessed value increase outside the normal cap.
• Voter-approved local option levies can add to the tax bill independent of the assessed value cap.

What This Means When You're Budgeting

Statewide, the effective property tax rate averages under 1 percent of market value, but that figure can be misleading on any individual property because of how assessed value diverges from market value over time. The listing sheet's current tax bill reflects the seller's assessed value, not necessarily what you will pay. It is a reasonable starting point for budgeting, but if you are buying a long-held home, understand that your bill will likely be close to the seller's, since Oregon's system carries the assessed value forward at sale rather than resetting it to market value.

A Few Practical Notes

• Oregon does not offer a general homestead exemption, though seniors and disabled veterans may qualify for deferral or reduction programs through the county assessor.
• Assessed value, tax rate, and any local levies all vary by county and taxing district, so figures differ between Multnomah, Washington, and Clackamas counties even for similar homes.
• If a property has an active appeal or a pending reassessment, it's worth asking about before writing an offer, since either can change next year's bill.