Oregon Property Taxes: Measure 5, Measure 50 and Your Home Budget

Oregon property taxes cannot be estimated reliably by multiplying a home's asking price by a Portland-wide percentage. Start with the property's county account, current tax statement and any changes that could affect its assessment.

The most useful distinction is between a property's assessed value and its final bill. The familiar 3% rule does not promise that the amount you pay will rise by only 3% each year.

The three values to identify

The Oregon Department of Revenue explains the state's assessment system. For an ordinary residential account, identify these terms before comparing homes:

Term	What it means for your review
Real Market Value, or RMV	The assessor's market-value estimate for the assessment date, not necessarily today's asking price
Maximum Assessed Value, or MAV	A value governed by Measure 50 rules, including an ordinary growth limitation and exceptions
Assessed Value, or AV	Generally the lower of RMV and MAV, used in calculating taxes; special assessment or exemption situations require additional review

For example, if a hypothetical ordinary account has RMV of $600,000 and MAV of $380,000, its AV would be $380,000. This example identifies the taxable-value starting point. It does not calculate the bill or predict the assessed value of a $600,000 purchase.

What Measure 50 does, and what 3% does not mean

Multnomah County's appraisal overview explains that, without property changes, MAV is calculated using the greater of 103% of the prior year's AV or 100% of the prior year's MAV. That is more precise than saying every assessed value always increases by exactly 3%.

New property, improvements and other exception events can change the calculation. New construction is not simply assigned the same taxable value as its sale price; the county describes a changed-property-ratio process. If a purchase includes recent work or a planned addition, ask the assessor how that work is reflected in the account and what remains to be assessed.

Do not translate a limitation on MAV into a guarantee about the final tax bill. Your budget needs the taxes actually imposed, not just one value on the statement.

What Measure 5 and compression do

Multnomah County's calculation guide describes two calculations: one using AV and the levy-code-area rates, and another applying Measure 5 limits to RMV, with excluded items treated separately. The lower calculation controls.

The Measure 5 categories limit education taxes to $5 per $1,000 of RMV and general-government taxes to $10 per $1,000 of RMV. Some items, including bond levies and certain special assessments, are outside those limits. “Compression” describes the reduction when the Measure 5 calculation produces the lower result.

This is why multiplying RMV by 1.5% does not necessarily reproduce the total bill. It also explains why changing rates or compression can affect what an owner pays even when MAV follows its ordinary rule.

Does buying a home reset its taxes?

A sale by itself does not reset MAV to the purchase price. The county's assessment FAQs explain the factors that can change assessed values and the distinction between a sale and work discovered around that sale.

The practical question is whether something else is changing: new construction, qualifying improvements, a partition, a change in use or the loss of a special assessment or exemption may need investigation. A long ownership period is not itself a separate tax benefit that disappears simply because a buyer takes title.

Ask about the actual account rather than assuming either that the bill will reset to your price or that the seller's payment will remain unchanged indefinitely.

Read the statement before building the monthly budget

The county's tax-statement guide shows where to find the account, property values and taxing districts. It also explains that a mortgage company requesting a bill does not remove the owner's responsibility for payment. Confirm the lender's escrow arrangement, particularly after a change of owner or loan.

For each home on your shortlist, record:

• the county and exact account number, including any separate accounts associated with the purchase;
• the statement's tax year, RMV, MAV where available, AV and levy-code area;
• the annual amount and whether a quoted figure includes a payment discount;
• any assessments, exemptions or special-assessment programs needing explanation;
• recent or proposed improvements and questions for the assessor; and
• the lender's tax estimate and escrow funding assumptions.

Keep tax paid, assessed value and purchase price in separate columns. If you calculate an effective percentage yourself, label its denominator and year. A ratio using today's asking price is different from one using the assessor's RMV.

Compare homes with the actual amounts

Two nearby homes can have different assessments, property histories, exemptions or levy areas. A neighborhood median effective rate cannot replace either account. When a difference matters to affordability, resolve it before relying on the lower number.

Add taxes to the other items in our Portland ownership-cost guide, and keep recurring expenses separate from cash needed at closing. For a property outside Multnomah County, obtain that county's actual records and explanation.

Contact Own It Northwest with the property links you are comparing. We can help organize the purchase questions; the county assessor and your tax adviser should resolve account-specific tax treatment.

Common questions

Is 1% of the price a reliable Portland property-tax estimate?

No. Use the actual account and current statement, including assessed values, taxing districts, applicable limits and any account-specific adjustments.

Can a bill increase more than 3%?

Yes. The 3% rule concerns MAV under ordinary conditions, not every component of the final bill. Ask what changed in the specific account.

Is the assessor's value an appraisal for my offer?

No. It serves a tax-assessment purpose and date. An offer analysis needs current comparable properties, condition and transaction evidence.